7392 remove event channel support from lofi and implement lofi_devlink_cache.

[unleashed.git] / usr / src / uts / common / os / sunddi.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 */

#include <sys/note.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/cred.h>
#include <sys/poll.h>
#include <sys/mman.h>
#include <sys/kmem.h>
#include <sys/model.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/open.h>
#include <sys/user.h>
#include <sys/t_lock.h>
#include <sys/vm.h>
#include <sys/stat.h>
#include <vm/hat.h>
#include <vm/seg.h>
#include <vm/seg_vn.h>
#include <vm/seg_dev.h>
#include <vm/as.h>
#include <sys/cmn_err.h>
#include <sys/cpuvar.h>
#include <sys/debug.h>
#include <sys/autoconf.h>
#include <sys/sunddi.h>
#include <sys/esunddi.h>
#include <sys/sunndi.h>
#include <sys/kstat.h>
#include <sys/conf.h>
#include <sys/ddi_impldefs.h>   /* include implementation structure defs */
#include <sys/ndi_impldefs.h>   /* include prototypes */
#include <sys/ddi_periodic.h>
#include <sys/hwconf.h>
#include <sys/pathname.h>
#include <sys/modctl.h>
#include <sys/epm.h>
#include <sys/devctl.h>
#include <sys/callb.h>
#include <sys/cladm.h>
#include <sys/sysevent.h>
#include <sys/dacf_impl.h>
#include <sys/ddidevmap.h>
#include <sys/bootconf.h>
#include <sys/disp.h>
#include <sys/atomic.h>
#include <sys/promif.h>
#include <sys/instance.h>
#include <sys/sysevent/eventdefs.h>
#include <sys/task.h>
#include <sys/project.h>
#include <sys/taskq.h>
#include <sys/devpolicy.h>
#include <sys/ctype.h>
#include <net/if.h>
#include <sys/rctl.h>
#include <sys/zone.h>
#include <sys/clock_impl.h>
#include <sys/ddi.h>
#include <sys/modhash.h>
#include <sys/sunldi_impl.h>
#include <sys/fs/dv_node.h>
#include <sys/fs/snode.h>

extern  pri_t   minclsyspri;

extern  rctl_hndl_t rc_project_locked_mem;
extern  rctl_hndl_t rc_zone_locked_mem;

#ifdef DEBUG
static int sunddi_debug = 0;
#endif /* DEBUG */

/* ddi_umem_unlock miscellaneous */

static  void    i_ddi_umem_unlock_thread_start(void);

static  kmutex_t        ddi_umem_unlock_mutex; /* unlock list mutex */
static  kcondvar_t      ddi_umem_unlock_cv; /* unlock list block/unblock */
static  kthread_t       *ddi_umem_unlock_thread;
/*
 * The ddi_umem_unlock FIFO list.  NULL head pointer indicates empty list.
 */
static  struct  ddi_umem_cookie *ddi_umem_unlock_head = NULL;
static  struct  ddi_umem_cookie *ddi_umem_unlock_tail = NULL;

/*
 * DDI(Sun) Function and flag definitions:
 */

#if defined(__x86)
/*
 * Used to indicate which entries were chosen from a range.
 */
char    *chosen_reg = "chosen-reg";
#endif

/*
 * Function used to ring system console bell
 */
void (*ddi_console_bell_func)(clock_t duration);

/*
 * Creating register mappings and handling interrupts:
 */

/*
 * Generic ddi_map: Call parent to fulfill request...
 */

int
ddi_map(dev_info_t *dp, ddi_map_req_t *mp, off_t offset,
    off_t len, caddr_t *addrp)
{
        dev_info_t *pdip;

        ASSERT(dp);
        pdip = (dev_info_t *)DEVI(dp)->devi_parent;
        return ((DEVI(pdip)->devi_ops->devo_bus_ops->bus_map)(pdip,
            dp, mp, offset, len, addrp));
}

/*
 * ddi_apply_range: (Called by nexi only.)
 * Apply ranges in parent node dp, to child regspec rp...
 */

int
ddi_apply_range(dev_info_t *dp, dev_info_t *rdip, struct regspec *rp)
{
        return (i_ddi_apply_range(dp, rdip, rp));
}

int
ddi_map_regs(dev_info_t *dip, uint_t rnumber, caddr_t *kaddrp, off_t offset,
    off_t len)
{
        ddi_map_req_t mr;
#if defined(__x86)
        struct {
                int     bus;
                int     addr;
                int     size;
        } reg, *reglist;
        uint_t  length;
        int     rc;

        /*
         * get the 'registers' or the 'reg' property.
         * We look up the reg property as an array of
         * int's.
         */
        rc = ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dip,
            DDI_PROP_DONTPASS, "registers", (int **)&reglist, &length);
        if (rc != DDI_PROP_SUCCESS)
                rc = ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dip,
                    DDI_PROP_DONTPASS, "reg", (int **)&reglist, &length);
        if (rc == DDI_PROP_SUCCESS) {
                /*
                 * point to the required entry.
                 */
                reg = reglist[rnumber];
                reg.addr += offset;
                if (len != 0)
                        reg.size = len;
                /*
                 * make a new property containing ONLY the required tuple.
                 */
                if (ddi_prop_update_int_array(DDI_DEV_T_NONE, dip,
                    chosen_reg, (int *)&reg, (sizeof (reg)/sizeof (int)))
                    != DDI_PROP_SUCCESS) {
                        cmn_err(CE_WARN, "%s%d: cannot create '%s' "
                            "property", DEVI(dip)->devi_name,
                            DEVI(dip)->devi_instance, chosen_reg);
                }
                /*
                 * free the memory allocated by
                 * ddi_prop_lookup_int_array ().
                 */
                ddi_prop_free((void *)reglist);
        }
#endif
        mr.map_op = DDI_MO_MAP_LOCKED;
        mr.map_type = DDI_MT_RNUMBER;
        mr.map_obj.rnumber = rnumber;
        mr.map_prot = PROT_READ | PROT_WRITE;
        mr.map_flags = DDI_MF_KERNEL_MAPPING;
        mr.map_handlep = NULL;
        mr.map_vers = DDI_MAP_VERSION;

        /*
         * Call my parent to map in my regs.
         */

        return (ddi_map(dip, &mr, offset, len, kaddrp));
}

void
ddi_unmap_regs(dev_info_t *dip, uint_t rnumber, caddr_t *kaddrp, off_t offset,
    off_t len)
{
        ddi_map_req_t mr;

        mr.map_op = DDI_MO_UNMAP;
        mr.map_type = DDI_MT_RNUMBER;
        mr.map_flags = DDI_MF_KERNEL_MAPPING;
        mr.map_prot = PROT_READ | PROT_WRITE;   /* who cares? */
        mr.map_obj.rnumber = rnumber;
        mr.map_handlep = NULL;
        mr.map_vers = DDI_MAP_VERSION;

        /*
         * Call my parent to unmap my regs.
         */

        (void) ddi_map(dip, &mr, offset, len, kaddrp);
        *kaddrp = (caddr_t)0;
#if defined(__x86)
        (void) ddi_prop_remove(DDI_DEV_T_NONE, dip, chosen_reg);
#endif
}

int
ddi_bus_map(dev_info_t *dip, dev_info_t *rdip, ddi_map_req_t *mp,
        off_t offset, off_t len, caddr_t *vaddrp)
{
        return (i_ddi_bus_map(dip, rdip, mp, offset, len, vaddrp));
}

/*
 * nullbusmap:  The/DDI default bus_map entry point for nexi
 *              not conforming to the reg/range paradigm (i.e. scsi, etc.)
 *              with no HAT/MMU layer to be programmed at this level.
 *
 *              If the call is to map by rnumber, return an error,
 *              otherwise pass anything else up the tree to my parent.
 */
int
nullbusmap(dev_info_t *dip, dev_info_t *rdip, ddi_map_req_t *mp,
        off_t offset, off_t len, caddr_t *vaddrp)
{
        _NOTE(ARGUNUSED(rdip))
        if (mp->map_type == DDI_MT_RNUMBER)
                return (DDI_ME_UNSUPPORTED);

        return (ddi_map(dip, mp, offset, len, vaddrp));
}

/*
 * ddi_rnumber_to_regspec: Not for use by leaf drivers.
 *                         Only for use by nexi using the reg/range paradigm.
 */
struct regspec *
ddi_rnumber_to_regspec(dev_info_t *dip, int rnumber)
{
        return (i_ddi_rnumber_to_regspec(dip, rnumber));
}


/*
 * Note that we allow the dip to be nil because we may be called
 * prior even to the instantiation of the devinfo tree itself - all
 * regular leaf and nexus drivers should always use a non-nil dip!
 *
 * We treat peek in a somewhat cavalier fashion .. assuming that we'll
 * simply get a synchronous fault as soon as we touch a missing address.
 *
 * Poke is rather more carefully handled because we might poke to a write
 * buffer, "succeed", then only find some time later that we got an
 * asynchronous fault that indicated that the address we were writing to
 * was not really backed by hardware.
 */

static int
i_ddi_peekpoke(dev_info_t *devi, ddi_ctl_enum_t cmd, size_t size,
    void *addr, void *value_p)
{
        union {
                uint64_t        u64;
                uint32_t        u32;
                uint16_t        u16;
                uint8_t         u8;
        } peekpoke_value;

        peekpoke_ctlops_t peekpoke_args;
        uint64_t dummy_result;
        int rval;

        /* Note: size is assumed to be correct;  it is not checked. */
        peekpoke_args.size = size;
        peekpoke_args.dev_addr = (uintptr_t)addr;
        peekpoke_args.handle = NULL;
        peekpoke_args.repcount = 1;
        peekpoke_args.flags = 0;

        if (cmd == DDI_CTLOPS_POKE) {
                switch (size) {
                case sizeof (uint8_t):
                        peekpoke_value.u8 = *(uint8_t *)value_p;
                        break;
                case sizeof (uint16_t):
                        peekpoke_value.u16 = *(uint16_t *)value_p;
                        break;
                case sizeof (uint32_t):
                        peekpoke_value.u32 = *(uint32_t *)value_p;
                        break;
                case sizeof (uint64_t):
                        peekpoke_value.u64 = *(uint64_t *)value_p;
                        break;
                }
        }

        peekpoke_args.host_addr = (uintptr_t)&peekpoke_value.u64;

        if (devi != NULL)
                rval = ddi_ctlops(devi, devi, cmd, &peekpoke_args,
                    &dummy_result);
        else
                rval = peekpoke_mem(cmd, &peekpoke_args);

        /*
         * A NULL value_p is permitted by ddi_peek(9F); discard the result.
         */
        if ((cmd == DDI_CTLOPS_PEEK) & (value_p != NULL)) {
                switch (size) {
                case sizeof (uint8_t):
                        *(uint8_t *)value_p = peekpoke_value.u8;
                        break;
                case sizeof (uint16_t):
                        *(uint16_t *)value_p = peekpoke_value.u16;
                        break;
                case sizeof (uint32_t):
                        *(uint32_t *)value_p = peekpoke_value.u32;
                        break;
                case sizeof (uint64_t):
                        *(uint64_t *)value_p = peekpoke_value.u64;
                        break;
                }
        }

        return (rval);
}

/*
 * Keep ddi_peek() and ddi_poke() in case 3rd parties are calling this.
 * they shouldn't be, but the 9f manpage kind of pseudo exposes it.
 */
int
ddi_peek(dev_info_t *devi, size_t size, void *addr, void *value_p)
{
        switch (size) {
        case sizeof (uint8_t):
        case sizeof (uint16_t):
        case sizeof (uint32_t):
        case sizeof (uint64_t):
                break;
        default:
                return (DDI_FAILURE);
        }

        return (i_ddi_peekpoke(devi, DDI_CTLOPS_PEEK, size, addr, value_p));
}

int
ddi_poke(dev_info_t *devi, size_t size, void *addr, void *value_p)
{
        switch (size) {
        case sizeof (uint8_t):
        case sizeof (uint16_t):
        case sizeof (uint32_t):
        case sizeof (uint64_t):
                break;
        default:
                return (DDI_FAILURE);
        }

        return (i_ddi_peekpoke(devi, DDI_CTLOPS_POKE, size, addr, value_p));
}

int
ddi_peek8(dev_info_t *dip, int8_t *addr, int8_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peek16(dev_info_t *dip, int16_t *addr, int16_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peek32(dev_info_t *dip, int32_t *addr, int32_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peek64(dev_info_t *dip, int64_t *addr, int64_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}


/*
 * We need to separate the old interfaces from the new ones and leave them
 * in here for a while. Previous versions of the OS defined the new interfaces
 * to the old interfaces. This way we can fix things up so that we can
 * eventually remove these interfaces.
 * e.g. A 3rd party module/driver using ddi_peek8 and built against S10
 * or earlier will actually have a reference to ddi_peekc in the binary.
 */
#ifdef _ILP32
int
ddi_peekc(dev_info_t *dip, int8_t *addr, int8_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peeks(dev_info_t *dip, int16_t *addr, int16_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peekl(dev_info_t *dip, int32_t *addr, int32_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}

int
ddi_peekd(dev_info_t *dip, int64_t *addr, int64_t *val_p)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_PEEK, sizeof (*val_p), addr,
            val_p));
}
#endif /* _ILP32 */

int
ddi_poke8(dev_info_t *dip, int8_t *addr, int8_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_poke16(dev_info_t *dip, int16_t *addr, int16_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_poke32(dev_info_t *dip, int32_t *addr, int32_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_poke64(dev_info_t *dip, int64_t *addr, int64_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

/*
 * We need to separate the old interfaces from the new ones and leave them
 * in here for a while. Previous versions of the OS defined the new interfaces
 * to the old interfaces. This way we can fix things up so that we can
 * eventually remove these interfaces.
 * e.g. A 3rd party module/driver using ddi_poke8 and built against S10
 * or earlier will actually have a reference to ddi_pokec in the binary.
 */
#ifdef _ILP32
int
ddi_pokec(dev_info_t *dip, int8_t *addr, int8_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_pokes(dev_info_t *dip, int16_t *addr, int16_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_pokel(dev_info_t *dip, int32_t *addr, int32_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}

int
ddi_poked(dev_info_t *dip, int64_t *addr, int64_t val)
{
        return (i_ddi_peekpoke(dip, DDI_CTLOPS_POKE, sizeof (val), addr, &val));
}
#endif /* _ILP32 */

/*
 * ddi_peekpokeio() is used primarily by the mem drivers for moving
 * data to and from uio structures via peek and poke.  Note that we
 * use "internal" routines ddi_peek and ddi_poke to make this go
 * slightly faster, avoiding the call overhead ..
 */
int
ddi_peekpokeio(dev_info_t *devi, struct uio *uio, enum uio_rw rw,
    caddr_t addr, size_t len, uint_t xfersize)
{
        int64_t ibuffer;
        int8_t w8;
        size_t sz;
        int o;

        if (xfersize > sizeof (long))
                xfersize = sizeof (long);

        while (len != 0) {
                if ((len | (uintptr_t)addr) & 1) {
                        sz = sizeof (int8_t);
                        if (rw == UIO_WRITE) {
                                if ((o = uwritec(uio)) == -1)
                                        return (DDI_FAILURE);
                                if (ddi_poke8(devi, (int8_t *)addr,
                                    (int8_t)o) != DDI_SUCCESS)
                                        return (DDI_FAILURE);
                        } else {
                                if (i_ddi_peekpoke(devi, DDI_CTLOPS_PEEK, sz,
                                    (int8_t *)addr, &w8) != DDI_SUCCESS)
                                        return (DDI_FAILURE);
                                if (ureadc(w8, uio))
                                        return (DDI_FAILURE);
                        }
                } else {
                        switch (xfersize) {
                        case sizeof (int64_t):
                                if (((len | (uintptr_t)addr) &
                                    (sizeof (int64_t) - 1)) == 0) {
                                        sz = xfersize;
                                        break;
                                }
                                /*FALLTHROUGH*/
                        case sizeof (int32_t):
                                if (((len | (uintptr_t)addr) &
                                    (sizeof (int32_t) - 1)) == 0) {
                                        sz = xfersize;
                                        break;
                                }
                                /*FALLTHROUGH*/
                        default:
                                /*
                                 * This still assumes that we might have an
                                 * I/O bus out there that permits 16-bit
                                 * transfers (and that it would be upset by
                                 * 32-bit transfers from such locations).
                                 */
                                sz = sizeof (int16_t);
                                break;
                        }

                        if (rw == UIO_READ) {
                                if (i_ddi_peekpoke(devi, DDI_CTLOPS_PEEK, sz,
                                    addr, &ibuffer) != DDI_SUCCESS)
                                        return (DDI_FAILURE);
                        }

                        if (uiomove(&ibuffer, sz, rw, uio))
                                return (DDI_FAILURE);

                        if (rw == UIO_WRITE) {
                                if (i_ddi_peekpoke(devi, DDI_CTLOPS_POKE, sz,
                                    addr, &ibuffer) != DDI_SUCCESS)
                                        return (DDI_FAILURE);
                        }
                }
                addr += sz;
                len -= sz;
        }
        return (DDI_SUCCESS);
}

/*
 * These routines are used by drivers that do layered ioctls
 * On sparc, they're implemented in assembler to avoid spilling
 * register windows in the common (copyin) case ..
 */
#if !defined(__sparc)
int
ddi_copyin(const void *buf, void *kernbuf, size_t size, int flags)
{
        if (flags & FKIOCTL)
                return (kcopy(buf, kernbuf, size) ? -1 : 0);
        return (copyin(buf, kernbuf, size));
}

int
ddi_copyout(const void *buf, void *kernbuf, size_t size, int flags)
{
        if (flags & FKIOCTL)
                return (kcopy(buf, kernbuf, size) ? -1 : 0);
        return (copyout(buf, kernbuf, size));
}
#endif  /* !__sparc */

/*
 * Conversions in nexus pagesize units.  We don't duplicate the
 * 'nil dip' semantics of peek/poke because btopr/btop/ptob are DDI/DKI
 * routines anyway.
 */
unsigned long
ddi_btop(dev_info_t *dip, unsigned long bytes)
{
        unsigned long pages;

        (void) ddi_ctlops(dip, dip, DDI_CTLOPS_BTOP, &bytes, &pages);
        return (pages);
}

unsigned long
ddi_btopr(dev_info_t *dip, unsigned long bytes)
{
        unsigned long pages;

        (void) ddi_ctlops(dip, dip, DDI_CTLOPS_BTOPR, &bytes, &pages);
        return (pages);
}

unsigned long
ddi_ptob(dev_info_t *dip, unsigned long pages)
{
        unsigned long bytes;

        (void) ddi_ctlops(dip, dip, DDI_CTLOPS_PTOB, &pages, &bytes);
        return (bytes);
}

unsigned int
ddi_enter_critical(void)
{
        return ((uint_t)spl7());
}

void
ddi_exit_critical(unsigned int spl)
{
        splx((int)spl);
}

/*
 * Nexus ctlops punter
 */

#if !defined(__sparc)
/*
 * Request bus_ctl parent to handle a bus_ctl request
 *
 * (The sparc version is in sparc_ddi.s)
 */
int
ddi_ctlops(dev_info_t *d, dev_info_t *r, ddi_ctl_enum_t op, void *a, void *v)
{
        int (*fp)();

        if (!d || !r)
                return (DDI_FAILURE);

        if ((d = (dev_info_t *)DEVI(d)->devi_bus_ctl) == NULL)
                return (DDI_FAILURE);

        fp = DEVI(d)->devi_ops->devo_bus_ops->bus_ctl;
        return ((*fp)(d, r, op, a, v));
}

#endif

/*
 * DMA/DVMA setup
 */

#if !defined(__sparc)
/*
 * Request bus_dma_ctl parent to fiddle with a dma request.
 *
 * (The sparc version is in sparc_subr.s)
 */
int
ddi_dma_mctl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, enum ddi_dma_ctlops request,
    off_t *offp, size_t *lenp, caddr_t *objp, uint_t flags)
{
        int (*fp)();

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_ctl;
        fp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_ctl;
        return ((*fp) (dip, rdip, handle, request, offp, lenp, objp, flags));
}
#endif

/*
 * For all DMA control functions, call the DMA control
 * routine and return status.
 *
 * Just plain assume that the parent is to be called.
 * If a nexus driver or a thread outside the framework
 * of a nexus driver or a leaf driver calls these functions,
 * it is up to them to deal with the fact that the parent's
 * bus_dma_ctl function will be the first one called.
 */

#define HD      ((ddi_dma_impl_t *)h)->dmai_rdip

/*
 * This routine is left in place to satisfy link dependencies
 * for any 3rd party nexus drivers that rely on it.  It is never
 * called, though.
 */
/*ARGSUSED*/
int
ddi_dma_map(dev_info_t *dip, dev_info_t *rdip,
    struct ddi_dma_req *dmareqp, ddi_dma_handle_t *handlep)
{
        return (DDI_FAILURE);
}

#if !defined(__sparc)

/*
 * The SPARC versions of these routines are done in assembler to
 * save register windows, so they're in sparc_subr.s.
 */

int
ddi_dma_allochdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_attr_t *attr,
    int (*waitfp)(caddr_t), caddr_t arg, ddi_dma_handle_t *handlep)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_attr_t *,
            int (*)(caddr_t), caddr_t, ddi_dma_handle_t *);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_allochdl;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_allochdl;
        return ((*funcp)(dip, rdip, attr, waitfp, arg, handlep));
}

int
ddi_dma_freehdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_handle_t handlep)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_allochdl;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_freehdl;
        return ((*funcp)(dip, rdip, handlep));
}

int
ddi_dma_bindhdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, struct ddi_dma_req *dmareq,
    ddi_dma_cookie_t *cp, uint_t *ccountp)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t,
            struct ddi_dma_req *, ddi_dma_cookie_t *, uint_t *);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_bindhdl;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_bindhdl;
        return ((*funcp)(dip, rdip, handle, dmareq, cp, ccountp));
}

int
ddi_dma_unbindhdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_unbindhdl;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_unbindhdl;
        return ((*funcp)(dip, rdip, handle));
}


int
ddi_dma_flush(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, off_t off, size_t len,
    uint_t cache_flags)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t,
            off_t, size_t, uint_t);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_flush;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_flush;
        return ((*funcp)(dip, rdip, handle, off, len, cache_flags));
}

int
ddi_dma_win(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, uint_t win, off_t *offp,
    size_t *lenp, ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t,
            uint_t, off_t *, size_t *, ddi_dma_cookie_t *, uint_t *);

        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_win;

        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_win;
        return ((*funcp)(dip, rdip, handle, win, offp, lenp,
            cookiep, ccountp));
}

int
ddi_dma_sync(ddi_dma_handle_t h, off_t o, size_t l, uint_t whom)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)h;
        dev_info_t *dip, *rdip;
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t, off_t,
            size_t, uint_t);

        /*
         * the DMA nexus driver will set DMP_NOSYNC if the
         * platform does not require any sync operation. For
         * example if the memory is uncached or consistent
         * and without any I/O write buffers involved.
         */
        if ((hp->dmai_rflags & DMP_NOSYNC) == DMP_NOSYNC)
                return (DDI_SUCCESS);

        dip = rdip = hp->dmai_rdip;
        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_flush;
        funcp = DEVI(dip)->devi_ops->devo_bus_ops->bus_dma_flush;
        return ((*funcp)(dip, rdip, h, o, l, whom));
}

int
ddi_dma_unbind_handle(ddi_dma_handle_t h)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)h;
        dev_info_t *dip, *rdip;
        int (*funcp)(dev_info_t *, dev_info_t *, ddi_dma_handle_t);

        dip = rdip = hp->dmai_rdip;
        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_unbindhdl;
        funcp = DEVI(rdip)->devi_bus_dma_unbindfunc;
        return ((*funcp)(dip, rdip, h));
}

#endif  /* !__sparc */

/*
 * DMA burst sizes, and transfer minimums
 */

int
ddi_dma_burstsizes(ddi_dma_handle_t handle)
{
        ddi_dma_impl_t *dimp = (ddi_dma_impl_t *)handle;

        if (!dimp)
                return (0);
        else
                return (dimp->dmai_burstsizes);
}

/*
 * Given two DMA attribute structures, apply the attributes
 * of one to the other, following the rules of attributes
 * and the wishes of the caller.
 *
 * The rules of DMA attribute structures are that you cannot
 * make things *less* restrictive as you apply one set
 * of attributes to another.
 *
 */
void
ddi_dma_attr_merge(ddi_dma_attr_t *attr, ddi_dma_attr_t *mod)
{
        attr->dma_attr_addr_lo =
            MAX(attr->dma_attr_addr_lo, mod->dma_attr_addr_lo);
        attr->dma_attr_addr_hi =
            MIN(attr->dma_attr_addr_hi, mod->dma_attr_addr_hi);
        attr->dma_attr_count_max =
            MIN(attr->dma_attr_count_max, mod->dma_attr_count_max);
        attr->dma_attr_align =
            MAX(attr->dma_attr_align,  mod->dma_attr_align);
        attr->dma_attr_burstsizes =
            (uint_t)(attr->dma_attr_burstsizes & mod->dma_attr_burstsizes);
        attr->dma_attr_minxfer =
            maxbit(attr->dma_attr_minxfer, mod->dma_attr_minxfer);
        attr->dma_attr_maxxfer =
            MIN(attr->dma_attr_maxxfer, mod->dma_attr_maxxfer);
        attr->dma_attr_seg = MIN(attr->dma_attr_seg, mod->dma_attr_seg);
        attr->dma_attr_sgllen = MIN((uint_t)attr->dma_attr_sgllen,
            (uint_t)mod->dma_attr_sgllen);
        attr->dma_attr_granular =
            MAX(attr->dma_attr_granular, mod->dma_attr_granular);
}

/*
 * mmap/segmap interface:
 */

/*
 * ddi_segmap:          setup the default segment driver. Calls the drivers
 *                      XXmmap routine to validate the range to be mapped.
 *                      Return ENXIO of the range is not valid.  Create
 *                      a seg_dev segment that contains all of the
 *                      necessary information and will reference the
 *                      default segment driver routines. It returns zero
 *                      on success or non-zero on failure.
 */
int
ddi_segmap(dev_t dev, off_t offset, struct as *asp, caddr_t *addrp, off_t len,
    uint_t prot, uint_t maxprot, uint_t flags, cred_t *credp)
{
        extern int spec_segmap(dev_t, off_t, struct as *, caddr_t *,
            off_t, uint_t, uint_t, uint_t, struct cred *);

        return (spec_segmap(dev, offset, asp, addrp, len,
            prot, maxprot, flags, credp));
}

/*
 * ddi_map_fault:       Resolve mappings at fault time.  Used by segment
 *                      drivers. Allows each successive parent to resolve
 *                      address translations and add its mappings to the
 *                      mapping list supplied in the page structure. It
 *                      returns zero on success or non-zero on failure.
 */

int
ddi_map_fault(dev_info_t *dip, struct hat *hat, struct seg *seg,
    caddr_t addr, struct devpage *dp, pfn_t pfn, uint_t prot, uint_t lock)
{
        return (i_ddi_map_fault(dip, dip, hat, seg, addr, dp, pfn, prot, lock));
}

/*
 * ddi_device_mapping_check:    Called from ddi_segmap_setup.
 *      Invokes platform specific DDI to determine whether attributes specified
 *      in attr(9s) are valid for the region of memory that will be made
 *      available for direct access to user process via the mmap(2) system call.
 */
int
ddi_device_mapping_check(dev_t dev, ddi_device_acc_attr_t *accattrp,
    uint_t rnumber, uint_t *hat_flags)
{
        ddi_acc_handle_t handle;
        ddi_map_req_t mr;
        ddi_acc_hdl_t *hp;
        int result;
        dev_info_t *dip;

        /*
         * we use e_ddi_hold_devi_by_dev to search for the devi.  We
         * release it immediately since it should already be held by
         * a devfs vnode.
         */
        if ((dip =
            e_ddi_hold_devi_by_dev(dev, E_DDI_HOLD_DEVI_NOATTACH)) == NULL)
                return (-1);
        ddi_release_devi(dip);          /* for e_ddi_hold_devi_by_dev() */

        /*
         * Allocate and initialize the common elements of data
         * access handle.
         */
        handle = impl_acc_hdl_alloc(KM_SLEEP, NULL);
        if (handle == NULL)
                return (-1);

        hp = impl_acc_hdl_get(handle);
        hp->ah_vers = VERS_ACCHDL;
        hp->ah_dip = dip;
        hp->ah_rnumber = rnumber;
        hp->ah_offset = 0;
        hp->ah_len = 0;
        hp->ah_acc = *accattrp;

        /*
         * Set up the mapping request and call to parent.
         */
        mr.map_op = DDI_MO_MAP_HANDLE;
        mr.map_type = DDI_MT_RNUMBER;
        mr.map_obj.rnumber = rnumber;
        mr.map_prot = PROT_READ | PROT_WRITE;
        mr.map_flags = DDI_MF_KERNEL_MAPPING;
        mr.map_handlep = hp;
        mr.map_vers = DDI_MAP_VERSION;
        result = ddi_map(dip, &mr, 0, 0, NULL);

        /*
         * Region must be mappable, pick up flags from the framework.
         */
        *hat_flags = hp->ah_hat_flags;

        impl_acc_hdl_free(handle);

        /*
         * check for end result.
         */
        if (result != DDI_SUCCESS)
                return (-1);
        return (0);
}


/*
 * Property functions:   See also, ddipropdefs.h.
 *
 * These functions are the framework for the property functions,
 * i.e. they support software defined properties.  All implementation
 * specific property handling (i.e.: self-identifying devices and
 * PROM defined properties are handled in the implementation specific
 * functions (defined in ddi_implfuncs.h).
 */

/*
 * nopropop:    Shouldn't be called, right?
 */
int
nopropop(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags,
    char *name, caddr_t valuep, int *lengthp)
{
        _NOTE(ARGUNUSED(dev, dip, prop_op, mod_flags, name, valuep, lengthp))
        return (DDI_PROP_NOT_FOUND);
}

#ifdef  DDI_PROP_DEBUG
int ddi_prop_debug_flag = 0;

int
ddi_prop_debug(int enable)
{
        int prev = ddi_prop_debug_flag;

        if ((enable != 0) || (prev != 0))
                printf("ddi_prop_debug: debugging %s\n",
                    enable ? "enabled" : "disabled");
        ddi_prop_debug_flag = enable;
        return (prev);
}

#endif  /* DDI_PROP_DEBUG */

/*
 * Search a property list for a match, if found return pointer
 * to matching prop struct, else return NULL.
 */

ddi_prop_t *
i_ddi_prop_search(dev_t dev, char *name, uint_t flags, ddi_prop_t **list_head)
{
        ddi_prop_t      *propp;

        /*
         * find the property in child's devinfo:
         * Search order defined by this search function is first matching
         * property with input dev == DDI_DEV_T_ANY matching any dev or
         * dev == propp->prop_dev, name == propp->name, and the correct
         * data type as specified in the flags.  If a DDI_DEV_T_NONE dev
         * value made it this far then it implies a DDI_DEV_T_ANY search.
         */
        if (dev == DDI_DEV_T_NONE)
                dev = DDI_DEV_T_ANY;

        for (propp = *list_head; propp != NULL; propp = propp->prop_next)  {

                if (!DDI_STRSAME(propp->prop_name, name))
                        continue;

                if ((dev != DDI_DEV_T_ANY) && (propp->prop_dev != dev))
                        continue;

                if (((propp->prop_flags & flags) & DDI_PROP_TYPE_MASK) == 0)
                        continue;

                return (propp);
        }

        return ((ddi_prop_t *)0);
}

/*
 * Search for property within devnames structures
 */
ddi_prop_t *
i_ddi_search_global_prop(dev_t dev, char *name, uint_t flags)
{
        major_t         major;
        struct devnames *dnp;
        ddi_prop_t      *propp;

        /*
         * Valid dev_t value is needed to index into the
         * correct devnames entry, therefore a dev_t
         * value of DDI_DEV_T_ANY is not appropriate.
         */
        ASSERT(dev != DDI_DEV_T_ANY);
        if (dev == DDI_DEV_T_ANY) {
                return ((ddi_prop_t *)0);
        }

        major = getmajor(dev);
        dnp = &(devnamesp[major]);

        if (dnp->dn_global_prop_ptr == NULL)
                return ((ddi_prop_t *)0);

        LOCK_DEV_OPS(&dnp->dn_lock);

        for (propp = dnp->dn_global_prop_ptr->prop_list;
            propp != NULL;
            propp = (ddi_prop_t *)propp->prop_next) {

                if (!DDI_STRSAME(propp->prop_name, name))
                        continue;

                if ((!(flags & DDI_PROP_ROOTNEX_GLOBAL)) &&
                    (!(flags & LDI_DEV_T_ANY)) && (propp->prop_dev != dev))
                        continue;

                if (((propp->prop_flags & flags) & DDI_PROP_TYPE_MASK) == 0)
                        continue;

                /* Property found, return it */
                UNLOCK_DEV_OPS(&dnp->dn_lock);
                return (propp);
        }

        UNLOCK_DEV_OPS(&dnp->dn_lock);
        return ((ddi_prop_t *)0);
}

static char prop_no_mem_msg[] = "can't allocate memory for ddi property <%s>";

/*
 * ddi_prop_search_global:
 *      Search the global property list within devnames
 *      for the named property.  Return the encoded value.
 */
static int
i_ddi_prop_search_global(dev_t dev, uint_t flags, char *name,
    void *valuep, uint_t *lengthp)
{
        ddi_prop_t      *propp;
        caddr_t         buffer;

        propp =  i_ddi_search_global_prop(dev, name, flags);

        /* Property NOT found, bail */
        if (propp == (ddi_prop_t *)0)
                return (DDI_PROP_NOT_FOUND);

        if (propp->prop_flags & DDI_PROP_UNDEF_IT)
                return (DDI_PROP_UNDEFINED);

        if ((buffer = kmem_alloc(propp->prop_len,
            (flags & DDI_PROP_CANSLEEP) ? KM_SLEEP : KM_NOSLEEP)) == NULL) {
                cmn_err(CE_CONT, prop_no_mem_msg, name);
                return (DDI_PROP_NO_MEMORY);
        }

        /*
         * Return the encoded data
         */
        *(caddr_t *)valuep = buffer;
        *lengthp = propp->prop_len;
        bcopy(propp->prop_val, buffer, propp->prop_len);

        return (DDI_PROP_SUCCESS);
}

/*
 * ddi_prop_search_common:      Lookup and return the encoded value
 */
int
ddi_prop_search_common(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    uint_t flags, char *name, void *valuep, uint_t *lengthp)
{
        ddi_prop_t      *propp;
        int             i;
        caddr_t         buffer;
        caddr_t         prealloc = NULL;
        int             plength = 0;
        dev_info_t      *pdip;
        int             (*bop)();

        /*CONSTANTCONDITION*/
        while (1)  {

                mutex_enter(&(DEVI(dip)->devi_lock));


                /*
                 * find the property in child's devinfo:
                 * Search order is:
                 *      1. driver defined properties
                 *      2. system defined properties
                 *      3. driver global properties
                 *      4. boot defined properties
                 */

                propp = i_ddi_prop_search(dev, name, flags,
                    &(DEVI(dip)->devi_drv_prop_ptr));
                if (propp == NULL)  {
                        propp = i_ddi_prop_search(dev, name, flags,
                            &(DEVI(dip)->devi_sys_prop_ptr));
                }
                if ((propp == NULL) && DEVI(dip)->devi_global_prop_list) {
                        propp = i_ddi_prop_search(dev, name, flags,
                            &DEVI(dip)->devi_global_prop_list->prop_list);
                }

                if (propp == NULL)  {
                        propp = i_ddi_prop_search(dev, name, flags,
                            &(DEVI(dip)->devi_hw_prop_ptr));
                }

                /*
                 * Software property found?
                 */
                if (propp != (ddi_prop_t *)0)   {

                        /*
                         * If explicit undefine, return now.
                         */
                        if (propp->prop_flags & DDI_PROP_UNDEF_IT) {
                                mutex_exit(&(DEVI(dip)->devi_lock));
                                if (prealloc)
                                        kmem_free(prealloc, plength);
                                return (DDI_PROP_UNDEFINED);
                        }

                        /*
                         * If we only want to know if it exists, return now
                         */
                        if (prop_op == PROP_EXISTS) {
                                mutex_exit(&(DEVI(dip)->devi_lock));
                                ASSERT(prealloc == NULL);
                                return (DDI_PROP_SUCCESS);
                        }

                        /*
                         * If length only request or prop length == 0,
                         * service request and return now.
                         */
                        if ((prop_op == PROP_LEN) ||(propp->prop_len == 0)) {
                                *lengthp = propp->prop_len;

                                /*
                                 * if prop_op is PROP_LEN_AND_VAL_ALLOC
                                 * that means prop_len is 0, so set valuep
                                 * also to NULL
                                 */
                                if (prop_op == PROP_LEN_AND_VAL_ALLOC)
                                        *(caddr_t *)valuep = NULL;

                                mutex_exit(&(DEVI(dip)->devi_lock));
                                if (prealloc)
                                        kmem_free(prealloc, plength);
                                return (DDI_PROP_SUCCESS);
                        }

                        /*
                         * If LEN_AND_VAL_ALLOC and the request can sleep,
                         * drop the mutex, allocate the buffer, and go
                         * through the loop again.  If we already allocated
                         * the buffer, and the size of the property changed,
                         * keep trying...
                         */
                        if ((prop_op == PROP_LEN_AND_VAL_ALLOC) &&
                            (flags & DDI_PROP_CANSLEEP))  {
                                if (prealloc && (propp->prop_len != plength)) {
                                        kmem_free(prealloc, plength);
                                        prealloc = NULL;
                                }
                                if (prealloc == NULL)  {
                                        plength = propp->prop_len;
                                        mutex_exit(&(DEVI(dip)->devi_lock));
                                        prealloc = kmem_alloc(plength,
                                            KM_SLEEP);
                                        continue;
                                }
                        }

                        /*
                         * Allocate buffer, if required.  Either way,
                         * set `buffer' variable.
                         */
                        i = *lengthp;                   /* Get callers length */
                        *lengthp = propp->prop_len;     /* Set callers length */

                        switch (prop_op) {

                        case PROP_LEN_AND_VAL_ALLOC:

                                if (prealloc == NULL) {
                                        buffer = kmem_alloc(propp->prop_len,
                                            KM_NOSLEEP);
                                } else {
                                        buffer = prealloc;
                                }

                                if (buffer == NULL)  {
                                        mutex_exit(&(DEVI(dip)->devi_lock));
                                        cmn_err(CE_CONT, prop_no_mem_msg, name);
                                        return (DDI_PROP_NO_MEMORY);
                                }
                                /* Set callers buf ptr */
                                *(caddr_t *)valuep = buffer;
                                break;

                        case PROP_LEN_AND_VAL_BUF:

                                if (propp->prop_len > (i)) {
                                        mutex_exit(&(DEVI(dip)->devi_lock));
                                        return (DDI_PROP_BUF_TOO_SMALL);
                                }

                                buffer = valuep;  /* Get callers buf ptr */
                                break;

                        default:
                                break;
                        }

                        /*
                         * Do the copy.
                         */
                        bcopy(propp->prop_val, buffer, propp->prop_len);
                        mutex_exit(&(DEVI(dip)->devi_lock));
                        return (DDI_PROP_SUCCESS);
                }

                mutex_exit(&(DEVI(dip)->devi_lock));
                if (prealloc)
                        kmem_free(prealloc, plength);
                prealloc = NULL;

                /*
                 * Prop not found, call parent bus_ops to deal with possible
                 * h/w layer (possible PROM defined props, etc.) and to
                 * possibly ascend the hierarchy, if allowed by flags.
                 */
                pdip = (dev_info_t *)DEVI(dip)->devi_parent;

                /*
                 * One last call for the root driver PROM props?
                 */
                if (dip == ddi_root_node())  {
                        return (ddi_bus_prop_op(dev, dip, dip, prop_op,
                            flags, name, valuep, (int *)lengthp));
                }

                /*
                 * We may have been called to check for properties
                 * within a single devinfo node that has no parent -
                 * see make_prop()
                 */
                if (pdip == NULL) {
                        ASSERT((flags &
                            (DDI_PROP_DONTPASS | DDI_PROP_NOTPROM)) ==
                            (DDI_PROP_DONTPASS | DDI_PROP_NOTPROM));
                        return (DDI_PROP_NOT_FOUND);
                }

                /*
                 * Instead of recursing, we do iterative calls up the tree.
                 * As a bit of optimization, skip the bus_op level if the
                 * node is a s/w node and if the parent's bus_prop_op function
                 * is `ddi_bus_prop_op', because we know that in this case,
                 * this function does nothing.
                 *
                 * 4225415: If the parent isn't attached, or the child
                 * hasn't been named by the parent yet, use the default
                 * ddi_bus_prop_op as a proxy for the parent.  This
                 * allows property lookups in any child/parent state to
                 * include 'prom' and inherited properties, even when
                 * there are no drivers attached to the child or parent.
                 */

                bop = ddi_bus_prop_op;
                if (i_ddi_devi_attached(pdip) &&
                    (i_ddi_node_state(dip) >= DS_INITIALIZED))
                        bop = DEVI(pdip)->devi_ops->devo_bus_ops->bus_prop_op;

                i = DDI_PROP_NOT_FOUND;

                if ((bop != ddi_bus_prop_op) || ndi_dev_is_prom_node(dip)) {
                        i = (*bop)(dev, pdip, dip, prop_op,
                            flags | DDI_PROP_DONTPASS,
                            name, valuep, lengthp);
                }

                if ((flags & DDI_PROP_DONTPASS) ||
                    (i != DDI_PROP_NOT_FOUND))
                        return (i);

                dip = pdip;
        }
        /*NOTREACHED*/
}


/*
 * ddi_prop_op: The basic property operator for drivers.
 *
 * In ddi_prop_op, the type of valuep is interpreted based on prop_op:
 *
 *      prop_op                 valuep
 *      ------                  ------
 *
 *      PROP_LEN                <unused>
 *
 *      PROP_LEN_AND_VAL_BUF    Pointer to callers buffer
 *
 *      PROP_LEN_AND_VAL_ALLOC  Address of callers pointer (will be set to
 *                              address of allocated buffer, if successful)
 */
int
ddi_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags,
    char *name, caddr_t valuep, int *lengthp)
{
        int     i;

        ASSERT((mod_flags & DDI_PROP_TYPE_MASK) == 0);

        /*
         * If this was originally an LDI prop lookup then we bail here.
         * The reason is that the LDI property lookup interfaces first call
         * a drivers prop_op() entry point to allow it to override
         * properties.  But if we've made it here, then the driver hasn't
         * overriden any properties.  We don't want to continue with the
         * property search here because we don't have any type inforamtion.
         * When we return failure, the LDI interfaces will then proceed to
         * call the typed property interfaces to look up the property.
         */
        if (mod_flags & DDI_PROP_DYNAMIC)
                return (DDI_PROP_NOT_FOUND);

        /*
         * check for pre-typed property consumer asking for typed property:
         * see e_ddi_getprop_int64.
         */
        if (mod_flags & DDI_PROP_CONSUMER_TYPED)
                mod_flags |= DDI_PROP_TYPE_INT64;
        mod_flags |= DDI_PROP_TYPE_ANY;

        i = ddi_prop_search_common(dev, dip, prop_op,
            mod_flags, name, valuep, (uint_t *)lengthp);
        if (i == DDI_PROP_FOUND_1275)
                return (DDI_PROP_SUCCESS);
        return (i);
}

/*
 * ddi_prop_op_nblocks_blksize: The basic property operator for drivers that
 * maintain size in number of blksize blocks.  Provides a dynamic property
 * implementation for size oriented properties based on nblocks64 and blksize
 * values passed in by the driver.  Fallback to ddi_prop_op if the nblocks64
 * is too large.  This interface should not be used with a nblocks64 that
 * represents the driver's idea of how to represent unknown, if nblocks is
 * unknown use ddi_prop_op.
 */
int
ddi_prop_op_nblocks_blksize(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int mod_flags, char *name, caddr_t valuep, int *lengthp,
    uint64_t nblocks64, uint_t blksize)
{
        uint64_t size64;
        int     blkshift;

        /* convert block size to shift value */
        ASSERT(BIT_ONLYONESET(blksize));
        blkshift = highbit(blksize) - 1;

        /*
         * There is no point in supporting nblocks64 values that don't have
         * an accurate uint64_t byte count representation.
         */
        if (nblocks64 >= (UINT64_MAX >> blkshift))
                return (ddi_prop_op(dev, dip, prop_op, mod_flags,
                    name, valuep, lengthp));

        size64 = nblocks64 << blkshift;
        return (ddi_prop_op_size_blksize(dev, dip, prop_op, mod_flags,
            name, valuep, lengthp, size64, blksize));
}

/*
 * ddi_prop_op_nblocks: ddi_prop_op_nblocks_blksize with DEV_BSIZE blksize.
 */
int
ddi_prop_op_nblocks(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int mod_flags, char *name, caddr_t valuep, int *lengthp, uint64_t nblocks64)
{
        return (ddi_prop_op_nblocks_blksize(dev, dip, prop_op,
            mod_flags, name, valuep, lengthp, nblocks64, DEV_BSIZE));
}

/*
 * ddi_prop_op_size_blksize: The basic property operator for block drivers that
 * maintain size in bytes. Provides a of dynamic property implementation for
 * size oriented properties based on size64 value and blksize passed in by the
 * driver.  Fallback to ddi_prop_op if the size64 is too large. This interface
 * should not be used with a size64 that represents the driver's idea of how
 * to represent unknown, if size is unknown use ddi_prop_op.
 *
 * NOTE: the legacy "nblocks"/"size" properties are treated as 32-bit unsigned
 * integers. While the most likely interface to request them ([bc]devi_size)
 * is declared int (signed) there is no enforcement of this, which means we
 * can't enforce limitations here without risking regression.
 */
int
ddi_prop_op_size_blksize(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int mod_flags, char *name, caddr_t valuep, int *lengthp, uint64_t size64,
    uint_t blksize)
{
        uint64_t nblocks64;
        int     callers_length;
        caddr_t buffer;
        int     blkshift;

        /*
         * This is a kludge to support capture of size(9P) pure dynamic
         * properties in snapshots for non-cmlb code (without exposing
         * i_ddi_prop_dyn changes). When everyone uses cmlb, this code
         * should be removed.
         */
        if (i_ddi_prop_dyn_driver_get(dip) == NULL) {
                static i_ddi_prop_dyn_t prop_dyn_size[] = {
                    {"Size",            DDI_PROP_TYPE_INT64,    S_IFCHR},
                    {"Nblocks",         DDI_PROP_TYPE_INT64,    S_IFBLK},
                    {NULL}
                };
                i_ddi_prop_dyn_driver_set(dip, prop_dyn_size);
        }

        /* convert block size to shift value */
        ASSERT(BIT_ONLYONESET(blksize));
        blkshift = highbit(blksize) - 1;

        /* compute DEV_BSIZE nblocks value */
        nblocks64 = size64 >> blkshift;

        /* get callers length, establish length of our dynamic properties */
        callers_length = *lengthp;

        if (strcmp(name, "Nblocks") == 0)
                *lengthp = sizeof (uint64_t);
        else if (strcmp(name, "Size") == 0)
                *lengthp = sizeof (uint64_t);
        else if ((strcmp(name, "nblocks") == 0) && (nblocks64 < UINT_MAX))
                *lengthp = sizeof (uint32_t);
        else if ((strcmp(name, "size") == 0) && (size64 < UINT_MAX))
                *lengthp = sizeof (uint32_t);
        else if ((strcmp(name, "blksize") == 0) && (blksize < UINT_MAX))
                *lengthp = sizeof (uint32_t);
        else {
                /* fallback to ddi_prop_op */
                return (ddi_prop_op(dev, dip, prop_op, mod_flags,
                    name, valuep, lengthp));
        }

        /* service request for the length of the property */
        if (prop_op == PROP_LEN)
                return (DDI_PROP_SUCCESS);

        switch (prop_op) {
        case PROP_LEN_AND_VAL_ALLOC:
                if ((buffer = kmem_alloc(*lengthp,
                    (mod_flags & DDI_PROP_CANSLEEP) ?
                    KM_SLEEP : KM_NOSLEEP)) == NULL)
                        return (DDI_PROP_NO_MEMORY);

                *(caddr_t *)valuep = buffer;    /* set callers buf ptr */
                break;

        case PROP_LEN_AND_VAL_BUF:
                /* the length of the property and the request must match */
                if (callers_length != *lengthp)
                        return (DDI_PROP_INVAL_ARG);

                buffer = valuep;                /* get callers buf ptr */
                break;

        default:
                return (DDI_PROP_INVAL_ARG);
        }

        /* transfer the value into the buffer */
        if (strcmp(name, "Nblocks") == 0)
                *((uint64_t *)buffer) = nblocks64;
        else if (strcmp(name, "Size") == 0)
                *((uint64_t *)buffer) = size64;
        else if (strcmp(name, "nblocks") == 0)
                *((uint32_t *)buffer) = (uint32_t)nblocks64;
        else if (strcmp(name, "size") == 0)
                *((uint32_t *)buffer) = (uint32_t)size64;
        else if (strcmp(name, "blksize") == 0)
                *((uint32_t *)buffer) = (uint32_t)blksize;
        return (DDI_PROP_SUCCESS);
}

/*
 * ddi_prop_op_size: ddi_prop_op_size_blksize with DEV_BSIZE block size.
 */
int
ddi_prop_op_size(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int mod_flags, char *name, caddr_t valuep, int *lengthp, uint64_t size64)
{
        return (ddi_prop_op_size_blksize(dev, dip, prop_op,
            mod_flags, name, valuep, lengthp, size64, DEV_BSIZE));
}

/*
 * Variable length props...
 */

/*
 * ddi_getlongprop:     Get variable length property len+val into a buffer
 *              allocated by property provider via kmem_alloc. Requester
 *              is responsible for freeing returned property via kmem_free.
 *
 *      Arguments:
 *
 *      dev_t:  Input:  dev_t of property.
 *      dip:    Input:  dev_info_t pointer of child.
 *      flags:  Input:  Possible flag modifiers are:
 *              DDI_PROP_DONTPASS:      Don't pass to parent if prop not found.
 *              DDI_PROP_CANSLEEP:      Memory allocation may sleep.
 *      name:   Input:  name of property.
 *      valuep: Output: Addr of callers buffer pointer.
 *      lengthp:Output: *lengthp will contain prop length on exit.
 *
 *      Possible Returns:
 *
 *              DDI_PROP_SUCCESS:       Prop found and returned.
 *              DDI_PROP_NOT_FOUND:     Prop not found
 *              DDI_PROP_UNDEFINED:     Prop explicitly undefined.
 *              DDI_PROP_NO_MEMORY:     Prop found, but unable to alloc mem.
 */

int
ddi_getlongprop(dev_t dev, dev_info_t *dip, int flags,
    char *name, caddr_t valuep, int *lengthp)
{
        return (ddi_prop_op(dev, dip, PROP_LEN_AND_VAL_ALLOC,
            flags, name, valuep, lengthp));
}

/*
 *
 * ddi_getlongprop_buf:         Get long prop into pre-allocated callers
 *                              buffer. (no memory allocation by provider).
 *
 *      dev_t:  Input:  dev_t of property.
 *      dip:    Input:  dev_info_t pointer of child.
 *      flags:  Input:  DDI_PROP_DONTPASS or NULL
 *      name:   Input:  name of property
 *      valuep: Input:  ptr to callers buffer.
 *      lengthp:I/O:    ptr to length of callers buffer on entry,
 *                      actual length of property on exit.
 *
 *      Possible returns:
 *
 *              DDI_PROP_SUCCESS        Prop found and returned
 *              DDI_PROP_NOT_FOUND      Prop not found
 *              DDI_PROP_UNDEFINED      Prop explicitly undefined.
 *              DDI_PROP_BUF_TOO_SMALL  Prop found, callers buf too small,
 *                                      no value returned, but actual prop
 *                                      length returned in *lengthp
 *
 */

int
ddi_getlongprop_buf(dev_t dev, dev_info_t *dip, int flags,
    char *name, caddr_t valuep, int *lengthp)
{
        return (ddi_prop_op(dev, dip, PROP_LEN_AND_VAL_BUF,
            flags, name, valuep, lengthp));
}

/*
 * Integer/boolean sized props.
 *
 * Call is value only... returns found boolean or int sized prop value or
 * defvalue if prop not found or is wrong length or is explicitly undefined.
 * Only flag is DDI_PROP_DONTPASS...
 *
 * By convention, this interface returns boolean (0) sized properties
 * as value (int)1.
 *
 * This never returns an error, if property not found or specifically
 * undefined, the input `defvalue' is returned.
 */

int
ddi_getprop(dev_t dev, dev_info_t *dip, int flags, char *name, int defvalue)
{
        int     propvalue = defvalue;
        int     proplength = sizeof (int);
        int     error;

        error = ddi_prop_op(dev, dip, PROP_LEN_AND_VAL_BUF,
            flags, name, (caddr_t)&propvalue, &proplength);

        if ((error == DDI_PROP_SUCCESS) && (proplength == 0))
                propvalue = 1;

        return (propvalue);
}

/*
 * Get prop length interface: flags are 0 or DDI_PROP_DONTPASS
 * if returns DDI_PROP_SUCCESS, length returned in *lengthp.
 */

int
ddi_getproplen(dev_t dev, dev_info_t *dip, int flags, char *name, int *lengthp)
{
        return (ddi_prop_op(dev, dip, PROP_LEN, flags, name, NULL, lengthp));
}

/*
 * Allocate a struct prop_driver_data, along with 'size' bytes
 * for decoded property data.  This structure is freed by
 * calling ddi_prop_free(9F).
 */
static void *
ddi_prop_decode_alloc(size_t size, void (*prop_free)(struct prop_driver_data *))
{
        struct prop_driver_data *pdd;

        /*
         * Allocate a structure with enough memory to store the decoded data.
         */
        pdd = kmem_zalloc(sizeof (struct prop_driver_data) + size, KM_SLEEP);
        pdd->pdd_size = (sizeof (struct prop_driver_data) + size);
        pdd->pdd_prop_free = prop_free;

        /*
         * Return a pointer to the location to put the decoded data.
         */
        return ((void *)((caddr_t)pdd + sizeof (struct prop_driver_data)));
}

/*
 * Allocated the memory needed to store the encoded data in the property
 * handle.
 */
static int
ddi_prop_encode_alloc(prop_handle_t *ph, size_t size)
{
        /*
         * If size is zero, then set data to NULL and size to 0.  This
         * is a boolean property.
         */
        if (size == 0) {
                ph->ph_size = 0;
                ph->ph_data = NULL;
                ph->ph_cur_pos = NULL;
                ph->ph_save_pos = NULL;
        } else {
                if (ph->ph_flags == DDI_PROP_DONTSLEEP) {
                        ph->ph_data = kmem_zalloc(size, KM_NOSLEEP);
                        if (ph->ph_data == NULL)
                                return (DDI_PROP_NO_MEMORY);
                } else
                        ph->ph_data = kmem_zalloc(size, KM_SLEEP);
                ph->ph_size = size;
                ph->ph_cur_pos = ph->ph_data;
                ph->ph_save_pos = ph->ph_data;
        }
        return (DDI_PROP_SUCCESS);
}

/*
 * Free the space allocated by the lookup routines.  Each lookup routine
 * returns a pointer to the decoded data to the driver.  The driver then
 * passes this pointer back to us.  This data actually lives in a struct
 * prop_driver_data.  We use negative indexing to find the beginning of
 * the structure and then free the entire structure using the size and
 * the free routine stored in the structure.
 */
void
ddi_prop_free(void *datap)
{
        struct prop_driver_data *pdd;

        /*
         * Get the structure
         */
        pdd = (struct prop_driver_data *)
            ((caddr_t)datap - sizeof (struct prop_driver_data));
        /*
         * Call the free routine to free it
         */
        (*pdd->pdd_prop_free)(pdd);
}

/*
 * Free the data associated with an array of ints,
 * allocated with ddi_prop_decode_alloc().
 */
static void
ddi_prop_free_ints(struct prop_driver_data *pdd)
{
        kmem_free(pdd, pdd->pdd_size);
}

/*
 * Free a single string property or a single string contained within
 * the argv style return value of an array of strings.
 */
static void
ddi_prop_free_string(struct prop_driver_data *pdd)
{
        kmem_free(pdd, pdd->pdd_size);

}

/*
 * Free an array of strings.
 */
static void
ddi_prop_free_strings(struct prop_driver_data *pdd)
{
        kmem_free(pdd, pdd->pdd_size);
}

/*
 * Free the data associated with an array of bytes.
 */
static void
ddi_prop_free_bytes(struct prop_driver_data *pdd)
{
        kmem_free(pdd, pdd->pdd_size);
}

/*
 * Reset the current location pointer in the property handle to the
 * beginning of the data.
 */
void
ddi_prop_reset_pos(prop_handle_t *ph)
{
        ph->ph_cur_pos = ph->ph_data;
        ph->ph_save_pos = ph->ph_data;
}

/*
 * Restore the current location pointer in the property handle to the
 * saved position.
 */
void
ddi_prop_save_pos(prop_handle_t *ph)
{
        ph->ph_save_pos = ph->ph_cur_pos;
}

/*
 * Save the location that the current location pointer is pointing to..
 */
void
ddi_prop_restore_pos(prop_handle_t *ph)
{
        ph->ph_cur_pos = ph->ph_save_pos;
}

/*
 * Property encode/decode functions
 */

/*
 * Decode a single integer property
 */
static int
ddi_prop_fm_decode_int(prop_handle_t *ph, void *data, uint_t *nelements)
{
        int     i;
        int     tmp;

        /*
         * If there is nothing to decode return an error
         */
        if (ph->ph_size == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * Decode the property as a single integer and return it
         * in data if we were able to decode it.
         */
        i = DDI_PROP_INT(ph, DDI_PROP_CMD_DECODE, &tmp);
        if (i < DDI_PROP_RESULT_OK) {
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        *(int *)data = tmp;
        *nelements = 1;
        return (DDI_PROP_SUCCESS);
}

/*
 * Decode a single 64 bit integer property
 */
static int
ddi_prop_fm_decode_int64(prop_handle_t *ph, void *data, uint_t *nelements)
{
        int     i;
        int64_t tmp;

        /*
         * If there is nothing to decode return an error
         */
        if (ph->ph_size == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * Decode the property as a single integer and return it
         * in data if we were able to decode it.
         */
        i = DDI_PROP_INT64(ph, DDI_PROP_CMD_DECODE, &tmp);
        if (i < DDI_PROP_RESULT_OK) {
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        *(int64_t *)data = tmp;
        *nelements = 1;
        return (DDI_PROP_SUCCESS);
}

/*
 * Decode an array of integers property
 */
static int
ddi_prop_fm_decode_ints(prop_handle_t *ph, void *data, uint_t *nelements)
{
        int     i;
        int     cnt = 0;
        int     *tmp;
        int     *intp;
        int     n;

        /*
         * Figure out how many array elements there are by going through the
         * data without decoding it first and counting.
         */
        for (;;) {
                i = DDI_PROP_INT(ph, DDI_PROP_CMD_SKIP, NULL);
                if (i < 0)
                        break;
                cnt++;
        }

        /*
         * If there are no elements return an error
         */
        if (cnt == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * If we cannot skip through the data, we cannot decode it
         */
        if (i == DDI_PROP_RESULT_ERROR)
                return (DDI_PROP_CANNOT_DECODE);

        /*
         * Reset the data pointer to the beginning of the encoded data
         */
        ddi_prop_reset_pos(ph);

        /*
         * Allocated memory to store the decoded value in.
         */
        intp = ddi_prop_decode_alloc((cnt * sizeof (int)),
            ddi_prop_free_ints);

        /*
         * Decode each element and place it in the space we just allocated
         */
        tmp = intp;
        for (n = 0; n < cnt; n++, tmp++) {
                i = DDI_PROP_INT(ph, DDI_PROP_CMD_DECODE, tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        /*
                         * Free the space we just allocated
                         * and return an error.
                         */
                        ddi_prop_free(intp);
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_DECODE);
                        }
                }
        }

        *nelements = cnt;
        *(int **)data = intp;

        return (DDI_PROP_SUCCESS);
}

/*
 * Decode a 64 bit integer array property
 */
static int
ddi_prop_fm_decode_int64_array(prop_handle_t *ph, void *data, uint_t *nelements)
{
        int     i;
        int     n;
        int     cnt = 0;
        int64_t *tmp;
        int64_t *intp;

        /*
         * Count the number of array elements by going
         * through the data without decoding it.
         */
        for (;;) {
                i = DDI_PROP_INT64(ph, DDI_PROP_CMD_SKIP, NULL);
                if (i < 0)
                        break;
                cnt++;
        }

        /*
         * If there are no elements return an error
         */
        if (cnt == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * If we cannot skip through the data, we cannot decode it
         */
        if (i == DDI_PROP_RESULT_ERROR)
                return (DDI_PROP_CANNOT_DECODE);

        /*
         * Reset the data pointer to the beginning of the encoded data
         */
        ddi_prop_reset_pos(ph);

        /*
         * Allocate memory to store the decoded value.
         */
        intp = ddi_prop_decode_alloc((cnt * sizeof (int64_t)),
            ddi_prop_free_ints);

        /*
         * Decode each element and place it in the space allocated
         */
        tmp = intp;
        for (n = 0; n < cnt; n++, tmp++) {
                i = DDI_PROP_INT64(ph, DDI_PROP_CMD_DECODE, tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        /*
                         * Free the space we just allocated
                         * and return an error.
                         */
                        ddi_prop_free(intp);
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_DECODE);
                        }
                }
        }

        *nelements = cnt;
        *(int64_t **)data = intp;

        return (DDI_PROP_SUCCESS);
}

/*
 * Encode an array of integers property (Can be one element)
 */
int
ddi_prop_fm_encode_ints(prop_handle_t *ph, void *data, uint_t nelements)
{
        int     i;
        int     *tmp;
        int     cnt;
        int     size;

        /*
         * If there is no data, we cannot do anything
         */
        if (nelements == 0)
                return (DDI_PROP_CANNOT_ENCODE);

        /*
         * Get the size of an encoded int.
         */
        size = DDI_PROP_INT(ph, DDI_PROP_CMD_GET_ESIZE, NULL);

        if (size < DDI_PROP_RESULT_OK) {
                switch (size) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_ENCODE);
                }
        }

        /*
         * Allocate space in the handle to store the encoded int.
         */
        if (ddi_prop_encode_alloc(ph, size * nelements) !=
            DDI_PROP_SUCCESS)
                return (DDI_PROP_NO_MEMORY);

        /*
         * Encode the array of ints.
         */
        tmp = (int *)data;
        for (cnt = 0; cnt < nelements; cnt++, tmp++) {
                i = DDI_PROP_INT(ph, DDI_PROP_CMD_ENCODE, tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_ENCODE);
                        }
                }
        }

        return (DDI_PROP_SUCCESS);
}


/*
 * Encode a 64 bit integer array property
 */
int
ddi_prop_fm_encode_int64(prop_handle_t *ph, void *data, uint_t nelements)
{
        int i;
        int cnt;
        int size;
        int64_t *tmp;

        /*
         * If there is no data, we cannot do anything
         */
        if (nelements == 0)
                return (DDI_PROP_CANNOT_ENCODE);

        /*
         * Get the size of an encoded 64 bit int.
         */
        size = DDI_PROP_INT64(ph, DDI_PROP_CMD_GET_ESIZE, NULL);

        if (size < DDI_PROP_RESULT_OK) {
                switch (size) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_ENCODE);
                }
        }

        /*
         * Allocate space in the handle to store the encoded int.
         */
        if (ddi_prop_encode_alloc(ph, size * nelements) !=
            DDI_PROP_SUCCESS)
                return (DDI_PROP_NO_MEMORY);

        /*
         * Encode the array of ints.
         */
        tmp = (int64_t *)data;
        for (cnt = 0; cnt < nelements; cnt++, tmp++) {
                i = DDI_PROP_INT64(ph, DDI_PROP_CMD_ENCODE, tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_ENCODE);
                        }
                }
        }

        return (DDI_PROP_SUCCESS);
}

/*
 * Decode a single string property
 */
static int
ddi_prop_fm_decode_string(prop_handle_t *ph, void *data, uint_t *nelements)
{
        char            *tmp;
        char            *str;
        int             i;
        int             size;

        /*
         * If there is nothing to decode return an error
         */
        if (ph->ph_size == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * Get the decoded size of the encoded string.
         */
        size = DDI_PROP_STR(ph, DDI_PROP_CMD_GET_DSIZE, NULL);
        if (size < DDI_PROP_RESULT_OK) {
                switch (size) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        /*
         * Allocated memory to store the decoded value in.
         */
        str = ddi_prop_decode_alloc((size_t)size, ddi_prop_free_string);

        ddi_prop_reset_pos(ph);

        /*
         * Decode the str and place it in the space we just allocated
         */
        tmp = str;
        i = DDI_PROP_STR(ph, DDI_PROP_CMD_DECODE, tmp);
        if (i < DDI_PROP_RESULT_OK) {
                /*
                 * Free the space we just allocated
                 * and return an error.
                 */
                ddi_prop_free(str);
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        *(char **)data = str;
        *nelements = 1;

        return (DDI_PROP_SUCCESS);
}

/*
 * Decode an array of strings.
 */
int
ddi_prop_fm_decode_strings(prop_handle_t *ph, void *data, uint_t *nelements)
{
        int             cnt = 0;
        char            **strs;
        char            **tmp;
        char            *ptr;
        int             i;
        int             n;
        int             size;
        size_t          nbytes;

        /*
         * Figure out how many array elements there are by going through the
         * data without decoding it first and counting.
         */
        for (;;) {
                i = DDI_PROP_STR(ph, DDI_PROP_CMD_SKIP, NULL);
                if (i < 0)
                        break;
                cnt++;
        }

        /*
         * If there are no elements return an error
         */
        if (cnt == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * If we cannot skip through the data, we cannot decode it
         */
        if (i == DDI_PROP_RESULT_ERROR)
                return (DDI_PROP_CANNOT_DECODE);

        /*
         * Reset the data pointer to the beginning of the encoded data
         */
        ddi_prop_reset_pos(ph);

        /*
         * Figure out how much memory we need for the sum total
         */
        nbytes = (cnt + 1) * sizeof (char *);

        for (n = 0; n < cnt; n++) {
                /*
                 * Get the decoded size of the current encoded string.
                 */
                size = DDI_PROP_STR(ph, DDI_PROP_CMD_GET_DSIZE, NULL);
                if (size < DDI_PROP_RESULT_OK) {
                        switch (size) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_DECODE);
                        }
                }

                nbytes += size;
        }

        /*
         * Allocate memory in which to store the decoded strings.
         */
        strs = ddi_prop_decode_alloc(nbytes, ddi_prop_free_strings);

        /*
         * Set up pointers for each string by figuring out yet
         * again how long each string is.
         */
        ddi_prop_reset_pos(ph);
        ptr = (caddr_t)strs + ((cnt + 1) * sizeof (char *));
        for (tmp = strs, n = 0; n < cnt; n++, tmp++) {
                /*
                 * Get the decoded size of the current encoded string.
                 */
                size = DDI_PROP_STR(ph, DDI_PROP_CMD_GET_DSIZE, NULL);
                if (size < DDI_PROP_RESULT_OK) {
                        ddi_prop_free(strs);
                        switch (size) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_DECODE);
                        }
                }

                *tmp = ptr;
                ptr += size;
        }

        /*
         * String array is terminated by a NULL
         */
        *tmp = NULL;

        /*
         * Finally, we can decode each string
         */
        ddi_prop_reset_pos(ph);
        for (tmp = strs, n = 0; n < cnt; n++, tmp++) {
                i = DDI_PROP_STR(ph, DDI_PROP_CMD_DECODE, *tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        /*
                         * Free the space we just allocated
                         * and return an error
                         */
                        ddi_prop_free(strs);
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_DECODE);
                        }
                }
        }

        *(char ***)data = strs;
        *nelements = cnt;

        return (DDI_PROP_SUCCESS);
}

/*
 * Encode a string.
 */
int
ddi_prop_fm_encode_string(prop_handle_t *ph, void *data, uint_t nelements)
{
        char            **tmp;
        int             size;
        int             i;

        /*
         * If there is no data, we cannot do anything
         */
        if (nelements == 0)
                return (DDI_PROP_CANNOT_ENCODE);

        /*
         * Get the size of the encoded string.
         */
        tmp = (char **)data;
        size = DDI_PROP_STR(ph, DDI_PROP_CMD_GET_ESIZE, *tmp);
        if (size < DDI_PROP_RESULT_OK) {
                switch (size) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_ENCODE);
                }
        }

        /*
         * Allocate space in the handle to store the encoded string.
         */
        if (ddi_prop_encode_alloc(ph, size) != DDI_PROP_SUCCESS)
                return (DDI_PROP_NO_MEMORY);

        ddi_prop_reset_pos(ph);

        /*
         * Encode the string.
         */
        tmp = (char **)data;
        i = DDI_PROP_STR(ph, DDI_PROP_CMD_ENCODE, *tmp);
        if (i < DDI_PROP_RESULT_OK) {
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_ENCODE);
                }
        }

        return (DDI_PROP_SUCCESS);
}


/*
 * Encode an array of strings.
 */
int
ddi_prop_fm_encode_strings(prop_handle_t *ph, void *data, uint_t nelements)
{
        int             cnt = 0;
        char            **tmp;
        int             size;
        uint_t          total_size;
        int             i;

        /*
         * If there is no data, we cannot do anything
         */
        if (nelements == 0)
                return (DDI_PROP_CANNOT_ENCODE);

        /*
         * Get the total size required to encode all the strings.
         */
        total_size = 0;
        tmp = (char **)data;
        for (cnt = 0; cnt < nelements; cnt++, tmp++) {
                size = DDI_PROP_STR(ph, DDI_PROP_CMD_GET_ESIZE, *tmp);
                if (size < DDI_PROP_RESULT_OK) {
                        switch (size) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_ENCODE);
                        }
                }
                total_size += (uint_t)size;
        }

        /*
         * Allocate space in the handle to store the encoded strings.
         */
        if (ddi_prop_encode_alloc(ph, total_size) != DDI_PROP_SUCCESS)
                return (DDI_PROP_NO_MEMORY);

        ddi_prop_reset_pos(ph);

        /*
         * Encode the array of strings.
         */
        tmp = (char **)data;
        for (cnt = 0; cnt < nelements; cnt++, tmp++) {
                i = DDI_PROP_STR(ph, DDI_PROP_CMD_ENCODE, *tmp);
                if (i < DDI_PROP_RESULT_OK) {
                        switch (i) {
                        case DDI_PROP_RESULT_EOF:
                                return (DDI_PROP_END_OF_DATA);

                        case DDI_PROP_RESULT_ERROR:
                                return (DDI_PROP_CANNOT_ENCODE);
                        }
                }
        }

        return (DDI_PROP_SUCCESS);
}


/*
 * Decode an array of bytes.
 */
static int
ddi_prop_fm_decode_bytes(prop_handle_t *ph, void *data, uint_t *nelements)
{
        uchar_t         *tmp;
        int             nbytes;
        int             i;

        /*
         * If there are no elements return an error
         */
        if (ph->ph_size == 0)
                return (DDI_PROP_END_OF_DATA);

        /*
         * Get the size of the encoded array of bytes.
         */
        nbytes = DDI_PROP_BYTES(ph, DDI_PROP_CMD_GET_DSIZE,
            data, ph->ph_size);
        if (nbytes < DDI_PROP_RESULT_OK) {
                switch (nbytes) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        /*
         * Allocated memory to store the decoded value in.
         */
        tmp = ddi_prop_decode_alloc(nbytes, ddi_prop_free_bytes);

        /*
         * Decode each element and place it in the space we just allocated
         */
        i = DDI_PROP_BYTES(ph, DDI_PROP_CMD_DECODE, tmp, nbytes);
        if (i < DDI_PROP_RESULT_OK) {
                /*
                 * Free the space we just allocated
                 * and return an error
                 */
                ddi_prop_free(tmp);
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        *(uchar_t **)data = tmp;
        *nelements = nbytes;

        return (DDI_PROP_SUCCESS);
}

/*
 * Encode an array of bytes.
 */
int
ddi_prop_fm_encode_bytes(prop_handle_t *ph, void *data, uint_t nelements)
{
        int             size;
        int             i;

        /*
         * If there are no elements, then this is a boolean property,
         * so just create a property handle with no data and return.
         */
        if (nelements == 0) {
                (void) ddi_prop_encode_alloc(ph, 0);
                return (DDI_PROP_SUCCESS);
        }

        /*
         * Get the size of the encoded array of bytes.
         */
        size = DDI_PROP_BYTES(ph, DDI_PROP_CMD_GET_ESIZE, (uchar_t *)data,
            nelements);
        if (size < DDI_PROP_RESULT_OK) {
                switch (size) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_DECODE);
                }
        }

        /*
         * Allocate space in the handle to store the encoded bytes.
         */
        if (ddi_prop_encode_alloc(ph, (uint_t)size) != DDI_PROP_SUCCESS)
                return (DDI_PROP_NO_MEMORY);

        /*
         * Encode the array of bytes.
         */
        i = DDI_PROP_BYTES(ph, DDI_PROP_CMD_ENCODE, (uchar_t *)data,
            nelements);
        if (i < DDI_PROP_RESULT_OK) {
                switch (i) {
                case DDI_PROP_RESULT_EOF:
                        return (DDI_PROP_END_OF_DATA);

                case DDI_PROP_RESULT_ERROR:
                        return (DDI_PROP_CANNOT_ENCODE);
                }
        }

        return (DDI_PROP_SUCCESS);
}

/*
 * OBP 1275 integer, string and byte operators.
 *
 * DDI_PROP_CMD_DECODE:
 *
 *      DDI_PROP_RESULT_ERROR:          cannot decode the data
 *      DDI_PROP_RESULT_EOF:            end of data
 *      DDI_PROP_OK:                    data was decoded
 *
 * DDI_PROP_CMD_ENCODE:
 *
 *      DDI_PROP_RESULT_ERROR:          cannot encode the data
 *      DDI_PROP_RESULT_EOF:            end of data
 *      DDI_PROP_OK:                    data was encoded
 *
 * DDI_PROP_CMD_SKIP:
 *
 *      DDI_PROP_RESULT_ERROR:          cannot skip the data
 *      DDI_PROP_RESULT_EOF:            end of data
 *      DDI_PROP_OK:                    data was skipped
 *
 * DDI_PROP_CMD_GET_ESIZE:
 *
 *      DDI_PROP_RESULT_ERROR:          cannot get encoded size
 *      DDI_PROP_RESULT_EOF:            end of data
 *      > 0:                            the encoded size
 *
 * DDI_PROP_CMD_GET_DSIZE:
 *
 *      DDI_PROP_RESULT_ERROR:          cannot get decoded size
 *      DDI_PROP_RESULT_EOF:            end of data
 *      > 0:                            the decoded size
 */

/*
 * OBP 1275 integer operator
 *
 * OBP properties are a byte stream of data, so integers may not be
 * properly aligned.  Therefore we need to copy them one byte at a time.
 */
int
ddi_prop_1275_int(prop_handle_t *ph, uint_t cmd, int *data)
{
        int     i;

        switch (cmd) {
        case DDI_PROP_CMD_DECODE:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0)
                        return (DDI_PROP_RESULT_ERROR);
                if (ph->ph_flags & PH_FROM_PROM) {
                        i = MIN(ph->ph_size, PROP_1275_INT_SIZE);
                        if ((int *)ph->ph_cur_pos > ((int *)ph->ph_data +
                            ph->ph_size - i))
                                return (DDI_PROP_RESULT_ERROR);
                } else {
                        if (ph->ph_size < sizeof (int) ||
                            ((int *)ph->ph_cur_pos > ((int *)ph->ph_data +
                            ph->ph_size - sizeof (int))))
                                return (DDI_PROP_RESULT_ERROR);
                }

                /*
                 * Copy the integer, using the implementation-specific
                 * copy function if the property is coming from the PROM.
                 */
                if (ph->ph_flags & PH_FROM_PROM) {
                        *data = impl_ddi_prop_int_from_prom(
                            (uchar_t *)ph->ph_cur_pos,
                            (ph->ph_size < PROP_1275_INT_SIZE) ?
                            ph->ph_size : PROP_1275_INT_SIZE);
                } else {
                        bcopy(ph->ph_cur_pos, data, sizeof (int));
                }

                /*
                 * Move the current location to the start of the next
                 * bit of undecoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos +
                    PROP_1275_INT_SIZE;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_ENCODE:
                /*
                 * Check that there is room to encoded the data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < PROP_1275_INT_SIZE ||
                    ((int *)ph->ph_cur_pos > ((int *)ph->ph_data +
                    ph->ph_size - sizeof (int))))
                        return (DDI_PROP_RESULT_ERROR);

                /*
                 * Encode the integer into the byte stream one byte at a
                 * time.
                 */
                bcopy(data, ph->ph_cur_pos, sizeof (int));

                /*
                 * Move the current location to the start of the next bit of
                 * space where we can store encoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos + PROP_1275_INT_SIZE;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_SKIP:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < PROP_1275_INT_SIZE)
                        return (DDI_PROP_RESULT_ERROR);


                if ((caddr_t)ph->ph_cur_pos ==
                    (caddr_t)ph->ph_data + ph->ph_size) {
                        return (DDI_PROP_RESULT_EOF);
                } else if ((caddr_t)ph->ph_cur_pos >
                    (caddr_t)ph->ph_data + ph->ph_size) {
                        return (DDI_PROP_RESULT_EOF);
                }

                /*
                 * Move the current location to the start of the next bit of
                 * undecoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos + PROP_1275_INT_SIZE;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_GET_ESIZE:
                /*
                 * Return the size of an encoded integer on OBP
                 */
                return (PROP_1275_INT_SIZE);

        case DDI_PROP_CMD_GET_DSIZE:
                /*
                 * Return the size of a decoded integer on the system.
                 */
                return (sizeof (int));

        default:
#ifdef DEBUG
                panic("ddi_prop_1275_int: %x impossible", cmd);
                /*NOTREACHED*/
#else
                return (DDI_PROP_RESULT_ERROR);
#endif  /* DEBUG */
        }
}

/*
 * 64 bit integer operator.
 *
 * This is an extension, defined by Sun, to the 1275 integer
 * operator.  This routine handles the encoding/decoding of
 * 64 bit integer properties.
 */
int
ddi_prop_int64_op(prop_handle_t *ph, uint_t cmd, int64_t *data)
{

        switch (cmd) {
        case DDI_PROP_CMD_DECODE:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0)
                        return (DDI_PROP_RESULT_ERROR);
                if (ph->ph_flags & PH_FROM_PROM) {
                        return (DDI_PROP_RESULT_ERROR);
                } else {
                        if (ph->ph_size < sizeof (int64_t) ||
                            ((int64_t *)ph->ph_cur_pos >
                            ((int64_t *)ph->ph_data +
                            ph->ph_size - sizeof (int64_t))))
                                return (DDI_PROP_RESULT_ERROR);
                }
                /*
                 * Copy the integer, using the implementation-specific
                 * copy function if the property is coming from the PROM.
                 */
                if (ph->ph_flags & PH_FROM_PROM) {
                        return (DDI_PROP_RESULT_ERROR);
                } else {
                        bcopy(ph->ph_cur_pos, data, sizeof (int64_t));
                }

                /*
                 * Move the current location to the start of the next
                 * bit of undecoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos +
                    sizeof (int64_t);
                        return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_ENCODE:
                /*
                 * Check that there is room to encoded the data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < sizeof (int64_t) ||
                    ((int64_t *)ph->ph_cur_pos > ((int64_t *)ph->ph_data +
                    ph->ph_size - sizeof (int64_t))))
                        return (DDI_PROP_RESULT_ERROR);

                /*
                 * Encode the integer into the byte stream one byte at a
                 * time.
                 */
                bcopy(data, ph->ph_cur_pos, sizeof (int64_t));

                /*
                 * Move the current location to the start of the next bit of
                 * space where we can store encoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos +
                    sizeof (int64_t);
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_SKIP:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < sizeof (int64_t))
                        return (DDI_PROP_RESULT_ERROR);

                if ((caddr_t)ph->ph_cur_pos ==
                    (caddr_t)ph->ph_data + ph->ph_size) {
                        return (DDI_PROP_RESULT_EOF);
                } else if ((caddr_t)ph->ph_cur_pos >
                    (caddr_t)ph->ph_data + ph->ph_size) {
                        return (DDI_PROP_RESULT_EOF);
                }

                /*
                 * Move the current location to the start of
                 * the next bit of undecoded data.
                 */
                ph->ph_cur_pos = (uchar_t *)ph->ph_cur_pos +
                    sizeof (int64_t);
                        return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_GET_ESIZE:
                /*
                 * Return the size of an encoded integer on OBP
                 */
                return (sizeof (int64_t));

        case DDI_PROP_CMD_GET_DSIZE:
                /*
                 * Return the size of a decoded integer on the system.
                 */
                return (sizeof (int64_t));

        default:
#ifdef DEBUG
                panic("ddi_prop_int64_op: %x impossible", cmd);
                /*NOTREACHED*/
#else
                return (DDI_PROP_RESULT_ERROR);
#endif  /* DEBUG */
        }
}

/*
 * OBP 1275 string operator.
 *
 * OBP strings are NULL terminated.
 */
int
ddi_prop_1275_string(prop_handle_t *ph, uint_t cmd, char *data)
{
        int     n;
        char    *p;
        char    *end;

        switch (cmd) {
        case DDI_PROP_CMD_DECODE:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0) {
                        return (DDI_PROP_RESULT_ERROR);
                }

                /*
                 * Match DDI_PROP_CMD_GET_DSIZE logic for when to stop and
                 * how to NULL terminate result.
                 */
                p = (char *)ph->ph_cur_pos;
                end = (char *)ph->ph_data + ph->ph_size;
                if (p >= end)
                        return (DDI_PROP_RESULT_EOF);

                while (p < end) {
                        *data++ = *p;
                        if (*p++ == 0) {        /* NULL from OBP */
                                ph->ph_cur_pos = p;
                                return (DDI_PROP_RESULT_OK);
                        }
                }

                /*
                 * If OBP did not NULL terminate string, which happens
                 * (at least) for 'true'/'false' boolean values, account for
                 * the space and store null termination on decode.
                 */
                ph->ph_cur_pos = p;
                *data = 0;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_ENCODE:
                /*
                 * Check that there is room to encoded the data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0) {
                        return (DDI_PROP_RESULT_ERROR);
                }

                n = strlen(data) + 1;
                if ((char *)ph->ph_cur_pos > ((char *)ph->ph_data +
                    ph->ph_size - n)) {
                        return (DDI_PROP_RESULT_ERROR);
                }

                /*
                 * Copy the NULL terminated string
                 */
                bcopy(data, ph->ph_cur_pos, n);

                /*
                 * Move the current location to the start of the next bit of
                 * space where we can store encoded data.
                 */
                ph->ph_cur_pos = (char *)ph->ph_cur_pos + n;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_SKIP:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0) {
                        return (DDI_PROP_RESULT_ERROR);
                }

                /*
                 * Return the string length plus one for the NULL
                 * We know the size of the property, we need to
                 * ensure that the string is properly formatted,
                 * since we may be looking up random OBP data.
                 */
                p = (char *)ph->ph_cur_pos;
                end = (char *)ph->ph_data + ph->ph_size;
                if (p >= end)
                        return (DDI_PROP_RESULT_EOF);

                while (p < end) {
                        if (*p++ == 0) {        /* NULL from OBP */
                                ph->ph_cur_pos = p;
                                return (DDI_PROP_RESULT_OK);
                        }
                }

                /*
                 * Accommodate the fact that OBP does not always NULL
                 * terminate strings.
                 */
                ph->ph_cur_pos = p;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_GET_ESIZE:
                /*
                 * Return the size of the encoded string on OBP.
                 */
                return (strlen(data) + 1);

        case DDI_PROP_CMD_GET_DSIZE:
                /*
                 * Return the string length plus one for the NULL.
                 * We know the size of the property, we need to
                 * ensure that the string is properly formatted,
                 * since we may be looking up random OBP data.
                 */
                p = (char *)ph->ph_cur_pos;
                end = (char *)ph->ph_data + ph->ph_size;
                if (p >= end)
                        return (DDI_PROP_RESULT_EOF);

                for (n = 0; p < end; n++) {
                        if (*p++ == 0) {        /* NULL from OBP */
                                ph->ph_cur_pos = p;
                                return (n + 1);
                        }
                }

                /*
                 * If OBP did not NULL terminate string, which happens for
                 * 'true'/'false' boolean values, account for the space
                 * to store null termination here.
                 */
                ph->ph_cur_pos = p;
                return (n + 1);

        default:
#ifdef DEBUG
                panic("ddi_prop_1275_string: %x impossible", cmd);
                /*NOTREACHED*/
#else
                return (DDI_PROP_RESULT_ERROR);
#endif  /* DEBUG */
        }
}

/*
 * OBP 1275 byte operator
 *
 * Caller must specify the number of bytes to get.  OBP encodes bytes
 * as a byte so there is a 1-to-1 translation.
 */
int
ddi_prop_1275_bytes(prop_handle_t *ph, uint_t cmd, uchar_t *data,
        uint_t nelements)
{
        switch (cmd) {
        case DDI_PROP_CMD_DECODE:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < nelements ||
                    ((char *)ph->ph_cur_pos > ((char *)ph->ph_data +
                    ph->ph_size - nelements)))
                        return (DDI_PROP_RESULT_ERROR);

                /*
                 * Copy out the bytes
                 */
                bcopy(ph->ph_cur_pos, data, nelements);

                /*
                 * Move the current location
                 */
                ph->ph_cur_pos = (char *)ph->ph_cur_pos + nelements;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_ENCODE:
                /*
                 * Check that there is room to encode the data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < nelements ||
                    ((char *)ph->ph_cur_pos > ((char *)ph->ph_data +
                    ph->ph_size - nelements)))
                        return (DDI_PROP_RESULT_ERROR);

                /*
                 * Copy in the bytes
                 */
                bcopy(data, ph->ph_cur_pos, nelements);

                /*
                 * Move the current location to the start of the next bit of
                 * space where we can store encoded data.
                 */
                ph->ph_cur_pos = (char *)ph->ph_cur_pos + nelements;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_SKIP:
                /*
                 * Check that there is encoded data
                 */
                if (ph->ph_cur_pos == NULL || ph->ph_size == 0 ||
                    ph->ph_size < nelements)
                        return (DDI_PROP_RESULT_ERROR);

                if ((char *)ph->ph_cur_pos > ((char *)ph->ph_data +
                    ph->ph_size - nelements))
                        return (DDI_PROP_RESULT_EOF);

                /*
                 * Move the current location
                 */
                ph->ph_cur_pos = (char *)ph->ph_cur_pos + nelements;
                return (DDI_PROP_RESULT_OK);

        case DDI_PROP_CMD_GET_ESIZE:
                /*
                 * The size in bytes of the encoded size is the
                 * same as the decoded size provided by the caller.
                 */
                return (nelements);

        case DDI_PROP_CMD_GET_DSIZE:
                /*
                 * Just return the number of bytes specified by the caller.
                 */
                return (nelements);

        default:
#ifdef DEBUG
                panic("ddi_prop_1275_bytes: %x impossible", cmd);
                /*NOTREACHED*/
#else
                return (DDI_PROP_RESULT_ERROR);
#endif  /* DEBUG */
        }
}

/*
 * Used for properties that come from the OBP, hardware configuration files,
 * or that are created by calls to ddi_prop_update(9F).
 */
static struct prop_handle_ops prop_1275_ops = {
        ddi_prop_1275_int,
        ddi_prop_1275_string,
        ddi_prop_1275_bytes,
        ddi_prop_int64_op
};


/*
 * Interface to create/modify a managed property on child's behalf...
 * Flags interpreted are:
 *      DDI_PROP_CANSLEEP:      Allow memory allocation to sleep.
 *      DDI_PROP_SYSTEM_DEF:    Manipulate system list rather than driver list.
 *
 * Use same dev_t when modifying or undefining a property.
 * Search for properties with DDI_DEV_T_ANY to match first named
 * property on the list.
 *
 * Properties are stored LIFO and subsequently will match the first
 * `matching' instance.
 */

/*
 * ddi_prop_add:        Add a software defined property
 */

/*
 * define to get a new ddi_prop_t.
 * km_flags are KM_SLEEP or KM_NOSLEEP.
 */

#define DDI_NEW_PROP_T(km_flags)        \
        (kmem_zalloc(sizeof (ddi_prop_t), km_flags))

static int
ddi_prop_add(dev_t dev, dev_info_t *dip, int flags,
    char *name, caddr_t value, int length)
{
        ddi_prop_t      *new_propp, *propp;
        ddi_prop_t      **list_head = &(DEVI(dip)->devi_drv_prop_ptr);
        int             km_flags = KM_NOSLEEP;
        int             name_buf_len;

        /*
         * If dev_t is DDI_DEV_T_ANY or name's length is zero return error.
         */

        if (dev == DDI_DEV_T_ANY || name == (char *)0 || strlen(name) == 0)
                return (DDI_PROP_INVAL_ARG);

        if (flags & DDI_PROP_CANSLEEP)
                km_flags = KM_SLEEP;

        if (flags & DDI_PROP_SYSTEM_DEF)
                list_head = &(DEVI(dip)->devi_sys_prop_ptr);
        else if (flags & DDI_PROP_HW_DEF)
                list_head = &(DEVI(dip)->devi_hw_prop_ptr);

        if ((new_propp = DDI_NEW_PROP_T(km_flags)) == NULL)  {
                cmn_err(CE_CONT, prop_no_mem_msg, name);
                return (DDI_PROP_NO_MEMORY);
        }

        /*
         * If dev is major number 0, then we need to do a ddi_name_to_major
         * to get the real major number for the device.  This needs to be
         * done because some drivers need to call ddi_prop_create in their
         * attach routines but they don't have a dev.  By creating the dev
         * ourself if the major number is 0, drivers will not have to know what
         * their major number.  They can just create a dev with major number
         * 0 and pass it in.  For device 0, we will be doing a little extra
         * work by recreating the same dev that we already have, but its the
         * price you pay :-).
         *
         * This fixes bug #1098060.
         */
        if (getmajor(dev) == DDI_MAJOR_T_UNKNOWN) {
                new_propp->prop_dev =
                    makedevice(ddi_name_to_major(DEVI(dip)->devi_binding_name),
                    getminor(dev));
        } else
                new_propp->prop_dev = dev;

        /*
         * Allocate space for property name and copy it in...
         */

        name_buf_len = strlen(name) + 1;
        new_propp->prop_name = kmem_alloc(name_buf_len, km_flags);
        if (new_propp->prop_name == 0)  {
                kmem_free(new_propp, sizeof (ddi_prop_t));
                cmn_err(CE_CONT, prop_no_mem_msg, name);
                return (DDI_PROP_NO_MEMORY);
        }
        bcopy(name, new_propp->prop_name, name_buf_len);

        /*
         * Set the property type
         */
        new_propp->prop_flags = flags & DDI_PROP_TYPE_MASK;

        /*
         * Set length and value ONLY if not an explicit property undefine:
         * NOTE: value and length are zero for explicit undefines.
         */

        if (flags & DDI_PROP_UNDEF_IT) {
                new_propp->prop_flags |= DDI_PROP_UNDEF_IT;
        } else {
                if ((new_propp->prop_len = length) != 0) {
                        new_propp->prop_val = kmem_alloc(length, km_flags);
                        if (new_propp->prop_val == 0)  {
                                kmem_free(new_propp->prop_name, name_buf_len);
                                kmem_free(new_propp, sizeof (ddi_prop_t));
                                cmn_err(CE_CONT, prop_no_mem_msg, name);
                                return (DDI_PROP_NO_MEMORY);
                        }
                        bcopy(value, new_propp->prop_val, length);
                }
        }

        /*
         * Link property into beginning of list. (Properties are LIFO order.)
         */

        mutex_enter(&(DEVI(dip)->devi_lock));
        propp = *list_head;
        new_propp->prop_next = propp;
        *list_head = new_propp;
        mutex_exit(&(DEVI(dip)->devi_lock));
        return (DDI_PROP_SUCCESS);
}


/*
 * ddi_prop_change:     Modify a software managed property value
 *
 *                      Set new length and value if found.
 *                      returns DDI_PROP_INVAL_ARG if dev is DDI_DEV_T_ANY or
 *                      input name is the NULL string.
 *                      returns DDI_PROP_NO_MEMORY if unable to allocate memory
 *
 *                      Note: an undef can be modified to be a define,
 *                      (you can't go the other way.)
 */

static int
ddi_prop_change(dev_t dev, dev_info_t *dip, int flags,
    char *name, caddr_t value, int length)
{
        ddi_prop_t      *propp;
        ddi_prop_t      **ppropp;
        caddr_t         p = NULL;

        if ((dev == DDI_DEV_T_ANY) || (name == NULL) || (strlen(name) == 0))
                return (DDI_PROP_INVAL_ARG);

        /*
         * Preallocate buffer, even if we don't need it...
         */
        if (length != 0)  {
                p = kmem_alloc(length, (flags & DDI_PROP_CANSLEEP) ?
                    KM_SLEEP : KM_NOSLEEP);
                if (p == NULL)  {
                        cmn_err(CE_CONT, prop_no_mem_msg, name);
                        return (DDI_PROP_NO_MEMORY);
                }
        }

        /*
         * If the dev_t value contains DDI_MAJOR_T_UNKNOWN for the major
         * number, a real dev_t value should be created based upon the dip's
         * binding driver.  See ddi_prop_add...
         */
        if (getmajor(dev) == DDI_MAJOR_T_UNKNOWN)
                dev = makedevice(
                    ddi_name_to_major(DEVI(dip)->devi_binding_name),
                    getminor(dev));

        /*
         * Check to see if the property exists.  If so we modify it.
         * Else we create it by calling ddi_prop_add().
         */
        mutex_enter(&(DEVI(dip)->devi_lock));
        ppropp = &DEVI(dip)->devi_drv_prop_ptr;
        if (flags & DDI_PROP_SYSTEM_DEF)
                ppropp = &DEVI(dip)->devi_sys_prop_ptr;
        else if (flags & DDI_PROP_HW_DEF)
                ppropp = &DEVI(dip)->devi_hw_prop_ptr;

        if ((propp = i_ddi_prop_search(dev, name, flags, ppropp)) != NULL) {
                /*
                 * Need to reallocate buffer?  If so, do it
                 * carefully (reuse same space if new prop
                 * is same size and non-NULL sized).
                 */
                if (length != 0)
                        bcopy(value, p, length);

                if (propp->prop_len != 0)
                        kmem_free(propp->prop_val, propp->prop_len);

                propp->prop_len = length;
                propp->prop_val = p;
                propp->prop_flags &= ~DDI_PROP_UNDEF_IT;
                mutex_exit(&(DEVI(dip)->devi_lock));
                return (DDI_PROP_SUCCESS);
        }

        mutex_exit(&(DEVI(dip)->devi_lock));
        if (length != 0)
                kmem_free(p, length);

        return (ddi_prop_add(dev, dip, flags, name, value, length));
}

/*
 * Common update routine used to update and encode a property.  Creates
 * a property handle, calls the property encode routine, figures out if
 * the property already exists and updates if it does.  Otherwise it
 * creates if it does not exist.
 */
int
ddi_prop_update_common(dev_t match_dev, dev_info_t *dip, int flags,
    char *name, void *data, uint_t nelements,
    int (*prop_create)(prop_handle_t *, void *data, uint_t nelements))
{
        prop_handle_t   ph;
        int             rval;
        uint_t          ourflags;

        /*
         * If dev_t is DDI_DEV_T_ANY or name's length is zero,
         * return error.
         */
        if (match_dev == DDI_DEV_T_ANY || name == NULL || strlen(name) == 0)
                return (DDI_PROP_INVAL_ARG);

        /*
         * Create the handle
         */
        ph.ph_data = NULL;
        ph.ph_cur_pos = NULL;
        ph.ph_save_pos = NULL;
        ph.ph_size = 0;
        ph.ph_ops = &prop_1275_ops;

        /*
         * ourflags:
         * For compatibility with the old interfaces.  The old interfaces
         * didn't sleep by default and slept when the flag was set.  These
         * interfaces to the opposite.  So the old interfaces now set the
         * DDI_PROP_DONTSLEEP flag by default which tells us not to sleep.
         *
         * ph.ph_flags:
         * Blocked data or unblocked data allocation
         * for ph.ph_data in ddi_prop_encode_alloc()
         */
        if (flags & DDI_PROP_DONTSLEEP) {
                ourflags = flags;
                ph.ph_flags = DDI_PROP_DONTSLEEP;
        } else {
                ourflags = flags | DDI_PROP_CANSLEEP;
                ph.ph_flags = DDI_PROP_CANSLEEP;
        }

        /*
         * Encode the data and store it in the property handle by
         * calling the prop_encode routine.
         */
        if ((rval = (*prop_create)(&ph, data, nelements)) !=
            DDI_PROP_SUCCESS) {
                if (rval == DDI_PROP_NO_MEMORY)
                        cmn_err(CE_CONT, prop_no_mem_msg, name);
                if (ph.ph_size != 0)
                        kmem_free(ph.ph_data, ph.ph_size);
                return (rval);
        }

        /*
         * The old interfaces use a stacking approach to creating
         * properties.  If we are being called from the old interfaces,
         * the DDI_PROP_STACK_CREATE flag will be set, so we just do a
         * create without checking.
         */
        if (flags & DDI_PROP_STACK_CREATE) {
                rval = ddi_prop_add(match_dev, dip,
                    ourflags, name, ph.ph_data, ph.ph_size);
        } else {
                rval = ddi_prop_change(match_dev, dip,
                    ourflags, name, ph.ph_data, ph.ph_size);
        }

        /*
         * Free the encoded data allocated in the prop_encode routine.
         */
        if (ph.ph_size != 0)
                kmem_free(ph.ph_data, ph.ph_size);

        return (rval);
}


/*
 * ddi_prop_create:     Define a managed property:
 *                      See above for details.
 */

int
ddi_prop_create(dev_t dev, dev_info_t *dip, int flag,
    char *name, caddr_t value, int length)
{
        if (!(flag & DDI_PROP_CANSLEEP)) {
                flag |= DDI_PROP_DONTSLEEP;
#ifdef DDI_PROP_DEBUG
                if (length != 0)
                        cmn_err(CE_NOTE, "!ddi_prop_create: interface obsolete,"
                            "use ddi_prop_update (prop = %s, node = %s%d)",
                            name, ddi_driver_name(dip), ddi_get_instance(dip));
#endif /* DDI_PROP_DEBUG */
        }
        flag &= ~DDI_PROP_SYSTEM_DEF;
        flag |= DDI_PROP_STACK_CREATE | DDI_PROP_TYPE_ANY;
        return (ddi_prop_update_common(dev, dip, flag, name,
            value, length, ddi_prop_fm_encode_bytes));
}

int
e_ddi_prop_create(dev_t dev, dev_info_t *dip, int flag,
    char *name, caddr_t value, int length)
{
        if (!(flag & DDI_PROP_CANSLEEP))
                flag |= DDI_PROP_DONTSLEEP;
        flag |= DDI_PROP_SYSTEM_DEF | DDI_PROP_STACK_CREATE | DDI_PROP_TYPE_ANY;
        return (ddi_prop_update_common(dev, dip, flag,
            name, value, length, ddi_prop_fm_encode_bytes));
}

int
ddi_prop_modify(dev_t dev, dev_info_t *dip, int flag,
    char *name, caddr_t value, int length)
{
        ASSERT((flag & DDI_PROP_TYPE_MASK) == 0);

        /*
         * If dev_t is DDI_DEV_T_ANY or name's length is zero,
         * return error.
         */
        if (dev == DDI_DEV_T_ANY || name == NULL || strlen(name) == 0)
                return (DDI_PROP_INVAL_ARG);

        if (!(flag & DDI_PROP_CANSLEEP))
                flag |= DDI_PROP_DONTSLEEP;
        flag &= ~DDI_PROP_SYSTEM_DEF;
        if (ddi_prop_exists(dev, dip, (flag | DDI_PROP_NOTPROM), name) == 0)
                return (DDI_PROP_NOT_FOUND);

        return (ddi_prop_update_common(dev, dip,
            (flag | DDI_PROP_TYPE_BYTE), name,
            value, length, ddi_prop_fm_encode_bytes));
}

int
e_ddi_prop_modify(dev_t dev, dev_info_t *dip, int flag,
    char *name, caddr_t value, int length)
{
        ASSERT((flag & DDI_PROP_TYPE_MASK) == 0);

        /*
         * If dev_t is DDI_DEV_T_ANY or name's length is zero,
         * return error.
         */
        if (dev == DDI_DEV_T_ANY || name == NULL || strlen(name) == 0)
                return (DDI_PROP_INVAL_ARG);

        if (ddi_prop_exists(dev, dip, (flag | DDI_PROP_SYSTEM_DEF), name) == 0)
                return (DDI_PROP_NOT_FOUND);

        if (!(flag & DDI_PROP_CANSLEEP))
                flag |= DDI_PROP_DONTSLEEP;
        return (ddi_prop_update_common(dev, dip,
            (flag | DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_BYTE),
            name, value, length, ddi_prop_fm_encode_bytes));
}


/*
 * Common lookup routine used to lookup and decode a property.
 * Creates a property handle, searches for the raw encoded data,
 * fills in the handle, and calls the property decode functions
 * passed in.
 *
 * This routine is not static because ddi_bus_prop_op() which lives in
 * ddi_impl.c calls it.  No driver should be calling this routine.
 */
int
ddi_prop_lookup_common(dev_t match_dev, dev_info_t *dip,
    uint_t flags, char *name, void *data, uint_t *nelements,
    int (*prop_decoder)(prop_handle_t *, void *data, uint_t *nelements))
{
        int             rval;
        uint_t          ourflags;
        prop_handle_t   ph;

        if ((match_dev == DDI_DEV_T_NONE) ||
            (name == NULL) || (strlen(name) == 0))
                return (DDI_PROP_INVAL_ARG);

        ourflags = (flags & DDI_PROP_DONTSLEEP) ? flags :
            flags | DDI_PROP_CANSLEEP;

        /*
         * Get the encoded data
         */
        bzero(&ph, sizeof (prop_handle_t));

        if ((flags & DDI_UNBND_DLPI2) || (flags & DDI_PROP_ROOTNEX_GLOBAL)) {
                /*
                 * For rootnex and unbound dlpi style-2 devices, index into
                 * the devnames' array and search the global
                 * property list.
                 */
                ourflags &= ~DDI_UNBND_DLPI2;
                rval = i_ddi_prop_search_global(match_dev,
                    ourflags, name, &ph.ph_data, &ph.ph_size);
        } else {
                rval = ddi_prop_search_common(match_dev, dip,
                    PROP_LEN_AND_VAL_ALLOC, ourflags, name,
                    &ph.ph_data, &ph.ph_size);

        }

        if (rval != DDI_PROP_SUCCESS && rval != DDI_PROP_FOUND_1275) {
                ASSERT(ph.ph_data == NULL);
                ASSERT(ph.ph_size == 0);
                return (rval);
        }

        /*
         * If the encoded data came from a OBP or software
         * use the 1275 OBP decode/encode routines.
         */
        ph.ph_cur_pos = ph.ph_data;
        ph.ph_save_pos = ph.ph_data;
        ph.ph_ops = &prop_1275_ops;
        ph.ph_flags = (rval == DDI_PROP_FOUND_1275) ? PH_FROM_PROM : 0;

        rval = (*prop_decoder)(&ph, data, nelements);

        /*
         * Free the encoded data
         */
        if (ph.ph_size != 0)
                kmem_free(ph.ph_data, ph.ph_size);

        return (rval);
}

/*
 * Lookup and return an array of composite properties.  The driver must
 * provide the decode routine.
 */
int
ddi_prop_lookup(dev_t match_dev, dev_info_t *dip,
    uint_t flags, char *name, void *data, uint_t *nelements,
    int (*prop_decoder)(prop_handle_t *, void *data, uint_t *nelements))
{
        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_COMPOSITE), name,
            data, nelements, prop_decoder));
}

/*
 * Return 1 if a property exists (no type checking done).
 * Return 0 if it does not exist.
 */
int
ddi_prop_exists(dev_t match_dev, dev_info_t *dip, uint_t flags, char *name)
{
        int     i;
        uint_t  x = 0;

        i = ddi_prop_search_common(match_dev, dip, PROP_EXISTS,
            flags | DDI_PROP_TYPE_MASK, name, NULL, &x);
        return (i == DDI_PROP_SUCCESS || i == DDI_PROP_FOUND_1275);
}


/*
 * Update an array of composite properties.  The driver must
 * provide the encode routine.
 */
int
ddi_prop_update(dev_t match_dev, dev_info_t *dip,
    char *name, void *data, uint_t nelements,
    int (*prop_create)(prop_handle_t *, void *data, uint_t nelements))
{
        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_COMPOSITE,
            name, data, nelements, prop_create));
}

/*
 * Get a single integer or boolean property and return it.
 * If the property does not exists, or cannot be decoded,
 * then return the defvalue passed in.
 *
 * This routine always succeeds.
 */
int
ddi_prop_get_int(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, int defvalue)
{
        int     data;
        uint_t  nelements;
        int     rval;

        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_get_int: invalid flag"
                            " 0x%x (prop = %s, node = %s%d)", flags,
                            name, ddi_driver_name(dip), ddi_get_instance(dip));
                }
#endif /* DEBUG */
                flags &= DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
                    LDI_DEV_T_ANY | DDI_UNBND_DLPI2;
        }

        if ((rval = ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_INT), name, &data, &nelements,
            ddi_prop_fm_decode_int)) != DDI_PROP_SUCCESS) {
                if (rval == DDI_PROP_END_OF_DATA)
                        data = 1;
                else
                        data = defvalue;
        }
        return (data);
}

/*
 * Get a single 64 bit integer or boolean property and return it.
 * If the property does not exists, or cannot be decoded,
 * then return the defvalue passed in.
 *
 * This routine always succeeds.
 */
int64_t
ddi_prop_get_int64(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, int64_t defvalue)
{
        int64_t data;
        uint_t  nelements;
        int     rval;

        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_get_int64: invalid flag"
                            " 0x%x (prop = %s, node = %s%d)", flags,
                            name, ddi_driver_name(dip), ddi_get_instance(dip));
                }
#endif /* DEBUG */
                return (DDI_PROP_INVAL_ARG);
        }

        if ((rval = ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_INT64 | DDI_PROP_NOTPROM),
            name, &data, &nelements, ddi_prop_fm_decode_int64))
            != DDI_PROP_SUCCESS) {
                if (rval == DDI_PROP_END_OF_DATA)
                        data = 1;
                else
                        data = defvalue;
        }
        return (data);
}

/*
 * Get an array of integer property
 */
int
ddi_prop_lookup_int_array(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, int **data, uint_t *nelements)
{
        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_lookup_int_array: "
                            "invalid flag 0x%x (prop = %s, node = %s%d)",
                            flags, name, ddi_driver_name(dip),
                            ddi_get_instance(dip));
                }
#endif /* DEBUG */
                flags &= DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
                    LDI_DEV_T_ANY | DDI_UNBND_DLPI2;
        }

        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_INT), name, data,
            nelements, ddi_prop_fm_decode_ints));
}

/*
 * Get an array of 64 bit integer properties
 */
int
ddi_prop_lookup_int64_array(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, int64_t **data, uint_t *nelements)
{
        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_lookup_int64_array: "
                            "invalid flag 0x%x (prop = %s, node = %s%d)",
                            flags, name, ddi_driver_name(dip),
                            ddi_get_instance(dip));
                }
#endif /* DEBUG */
                return (DDI_PROP_INVAL_ARG);
        }

        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_INT64 | DDI_PROP_NOTPROM),
            name, data, nelements, ddi_prop_fm_decode_int64_array));
}

/*
 * Update a single integer property.  If the property exists on the drivers
 * property list it updates, else it creates it.
 */
int
ddi_prop_update_int(dev_t match_dev, dev_info_t *dip,
    char *name, int data)
{
        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_INT,
            name, &data, 1, ddi_prop_fm_encode_ints));
}

/*
 * Update a single 64 bit integer property.
 * Update the driver property list if it exists, else create it.
 */
int
ddi_prop_update_int64(dev_t match_dev, dev_info_t *dip,
    char *name, int64_t data)
{
        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_INT64,
            name, &data, 1, ddi_prop_fm_encode_int64));
}

int
e_ddi_prop_update_int(dev_t match_dev, dev_info_t *dip,
    char *name, int data)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_INT,
            name, &data, 1, ddi_prop_fm_encode_ints));
}

int
e_ddi_prop_update_int64(dev_t match_dev, dev_info_t *dip,
    char *name, int64_t data)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_INT64,
            name, &data, 1, ddi_prop_fm_encode_int64));
}

/*
 * Update an array of integer property.  If the property exists on the drivers
 * property list it updates, else it creates it.
 */
int
ddi_prop_update_int_array(dev_t match_dev, dev_info_t *dip,
    char *name, int *data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_INT,
            name, data, nelements, ddi_prop_fm_encode_ints));
}

/*
 * Update an array of 64 bit integer properties.
 * Update the driver property list if it exists, else create it.
 */
int
ddi_prop_update_int64_array(dev_t match_dev, dev_info_t *dip,
    char *name, int64_t *data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_INT64,
            name, data, nelements, ddi_prop_fm_encode_int64));
}

int
e_ddi_prop_update_int64_array(dev_t match_dev, dev_info_t *dip,
    char *name, int64_t *data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_INT64,
            name, data, nelements, ddi_prop_fm_encode_int64));
}

int
e_ddi_prop_update_int_array(dev_t match_dev, dev_info_t *dip,
    char *name, int *data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_INT,
            name, data, nelements, ddi_prop_fm_encode_ints));
}

/*
 * Get a single string property.
 */
int
ddi_prop_lookup_string(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, char **data)
{
        uint_t x;

        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "%s: invalid flag 0x%x "
                            "(prop = %s, node = %s%d); invalid bits ignored",
                            "ddi_prop_lookup_string", flags, name,
                            ddi_driver_name(dip), ddi_get_instance(dip));
                }
#endif /* DEBUG */
                flags &= DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
                    LDI_DEV_T_ANY | DDI_UNBND_DLPI2;
        }

        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_STRING), name, data,
            &x, ddi_prop_fm_decode_string));
}

/*
 * Get an array of strings property.
 */
int
ddi_prop_lookup_string_array(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, char ***data, uint_t *nelements)
{
        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_lookup_string_array: "
                            "invalid flag 0x%x (prop = %s, node = %s%d)",
                            flags, name, ddi_driver_name(dip),
                            ddi_get_instance(dip));
                }
#endif /* DEBUG */
                flags &= DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
                    LDI_DEV_T_ANY | DDI_UNBND_DLPI2;
        }

        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_STRING), name, data,
            nelements, ddi_prop_fm_decode_strings));
}

/*
 * Update a single string property.
 */
int
ddi_prop_update_string(dev_t match_dev, dev_info_t *dip,
    char *name, char *data)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_TYPE_STRING, name, &data, 1,
            ddi_prop_fm_encode_string));
}

int
e_ddi_prop_update_string(dev_t match_dev, dev_info_t *dip,
    char *name, char *data)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_STRING,
            name, &data, 1, ddi_prop_fm_encode_string));
}


/*
 * Update an array of strings property.
 */
int
ddi_prop_update_string_array(dev_t match_dev, dev_info_t *dip,
    char *name, char **data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_TYPE_STRING, name, data, nelements,
            ddi_prop_fm_encode_strings));
}

int
e_ddi_prop_update_string_array(dev_t match_dev, dev_info_t *dip,
    char *name, char **data, uint_t nelements)
{
        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_STRING,
            name, data, nelements,
            ddi_prop_fm_encode_strings));
}


/*
 * Get an array of bytes property.
 */
int
ddi_prop_lookup_byte_array(dev_t match_dev, dev_info_t *dip, uint_t flags,
    char *name, uchar_t **data, uint_t *nelements)
{
        if (flags & ~(DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
            LDI_DEV_T_ANY | DDI_UNBND_DLPI2 | DDI_PROP_ROOTNEX_GLOBAL)) {
#ifdef DEBUG
                if (dip != NULL) {
                        cmn_err(CE_WARN, "ddi_prop_lookup_byte_array: "
                            " invalid flag 0x%x (prop = %s, node = %s%d)",
                            flags, name, ddi_driver_name(dip),
                            ddi_get_instance(dip));
                }
#endif /* DEBUG */
                flags &= DDI_PROP_DONTPASS | DDI_PROP_NOTPROM |
                    LDI_DEV_T_ANY | DDI_UNBND_DLPI2;
        }

        return (ddi_prop_lookup_common(match_dev, dip,
            (flags | DDI_PROP_TYPE_BYTE), name, data,
            nelements, ddi_prop_fm_decode_bytes));
}

/*
 * Update an array of bytes property.
 */
int
ddi_prop_update_byte_array(dev_t match_dev, dev_info_t *dip,
    char *name, uchar_t *data, uint_t nelements)
{
        if (nelements == 0)
                return (DDI_PROP_INVAL_ARG);

        return (ddi_prop_update_common(match_dev, dip, DDI_PROP_TYPE_BYTE,
            name, data, nelements, ddi_prop_fm_encode_bytes));
}


int
e_ddi_prop_update_byte_array(dev_t match_dev, dev_info_t *dip,
    char *name, uchar_t *data, uint_t nelements)
{
        if (nelements == 0)
                return (DDI_PROP_INVAL_ARG);

        return (ddi_prop_update_common(match_dev, dip,
            DDI_PROP_SYSTEM_DEF | DDI_PROP_TYPE_BYTE,
            name, data, nelements, ddi_prop_fm_encode_bytes));
}


/*
 * ddi_prop_remove_common:      Undefine a managed property:
 *                      Input dev_t must match dev_t when defined.
 *                      Returns DDI_PROP_NOT_FOUND, possibly.
 *                      DDI_PROP_INVAL_ARG is also possible if dev is
 *                      DDI_DEV_T_ANY or incoming name is the NULL string.
 */
int
ddi_prop_remove_common(dev_t dev, dev_info_t *dip, char *name, int flag)
{
        ddi_prop_t      **list_head = &(DEVI(dip)->devi_drv_prop_ptr);
        ddi_prop_t      *propp;
        ddi_prop_t      *lastpropp = NULL;

        if ((dev == DDI_DEV_T_ANY) || (name == (char *)0) ||
            (strlen(name) == 0)) {
                return (DDI_PROP_INVAL_ARG);
        }

        if (flag & DDI_PROP_SYSTEM_DEF)
                list_head = &(DEVI(dip)->devi_sys_prop_ptr);
        else if (flag & DDI_PROP_HW_DEF)
                list_head = &(DEVI(dip)->devi_hw_prop_ptr);

        mutex_enter(&(DEVI(dip)->devi_lock));

        for (propp = *list_head; propp != NULL; propp = propp->prop_next)  {
                if (DDI_STRSAME(propp->prop_name, name) &&
                    (dev == propp->prop_dev)) {
                        /*
                         * Unlink this propp allowing for it to
                         * be first in the list:
                         */

                        if (lastpropp == NULL)
                                *list_head = propp->prop_next;
                        else
                                lastpropp->prop_next = propp->prop_next;

                        mutex_exit(&(DEVI(dip)->devi_lock));

                        /*
                         * Free memory and return...
                         */
                        kmem_free(propp->prop_name,
                            strlen(propp->prop_name) + 1);
                        if (propp->prop_len != 0)
                                kmem_free(propp->prop_val, propp->prop_len);
                        kmem_free(propp, sizeof (ddi_prop_t));
                        return (DDI_PROP_SUCCESS);
                }
                lastpropp = propp;
        }
        mutex_exit(&(DEVI(dip)->devi_lock));
        return (DDI_PROP_NOT_FOUND);
}

int
ddi_prop_remove(dev_t dev, dev_info_t *dip, char *name)
{
        return (ddi_prop_remove_common(dev, dip, name, 0));
}

int
e_ddi_prop_remove(dev_t dev, dev_info_t *dip, char *name)
{
        return (ddi_prop_remove_common(dev, dip, name, DDI_PROP_SYSTEM_DEF));
}

/*
 * e_ddi_prop_list_delete: remove a list of properties
 *      Note that the caller needs to provide the required protection
 *      (eg. devi_lock if these properties are still attached to a devi)
 */
void
e_ddi_prop_list_delete(ddi_prop_t *props)
{
        i_ddi_prop_list_delete(props);
}

/*
 * ddi_prop_remove_all_common:
 *      Used before unloading a driver to remove
 *      all properties. (undefines all dev_t's props.)
 *      Also removes `explicitly undefined' props.
 *      No errors possible.
 */
void
ddi_prop_remove_all_common(dev_info_t *dip, int flag)
{
        ddi_prop_t      **list_head;

        mutex_enter(&(DEVI(dip)->devi_lock));
        if (flag & DDI_PROP_SYSTEM_DEF) {
                list_head = &(DEVI(dip)->devi_sys_prop_ptr);
        } else if (flag & DDI_PROP_HW_DEF) {
                list_head = &(DEVI(dip)->devi_hw_prop_ptr);
        } else {
                list_head = &(DEVI(dip)->devi_drv_prop_ptr);
        }
        i_ddi_prop_list_delete(*list_head);
        *list_head = NULL;
        mutex_exit(&(DEVI(dip)->devi_lock));
}


/*
 * ddi_prop_remove_all:         Remove all driver prop definitions.
 */

void
ddi_prop_remove_all(dev_info_t *dip)
{
        i_ddi_prop_dyn_driver_set(dip, NULL);
        ddi_prop_remove_all_common(dip, 0);
}

/*
 * e_ddi_prop_remove_all:       Remove all system prop definitions.
 */

void
e_ddi_prop_remove_all(dev_info_t *dip)
{
        ddi_prop_remove_all_common(dip, (int)DDI_PROP_SYSTEM_DEF);
}


/*
 * ddi_prop_undefine:   Explicitly undefine a property.  Property
 *                      searches which match this property return
 *                      the error code DDI_PROP_UNDEFINED.
 *
 *                      Use ddi_prop_remove to negate effect of
 *                      ddi_prop_undefine
 *
 *                      See above for error returns.
 */

int
ddi_prop_undefine(dev_t dev, dev_info_t *dip, int flag, char *name)
{
        if (!(flag & DDI_PROP_CANSLEEP))
                flag |= DDI_PROP_DONTSLEEP;
        flag |= DDI_PROP_STACK_CREATE | DDI_PROP_UNDEF_IT | DDI_PROP_TYPE_ANY;
        return (ddi_prop_update_common(dev, dip, flag,
            name, NULL, 0, ddi_prop_fm_encode_bytes));
}

int
e_ddi_prop_undefine(dev_t dev, dev_info_t *dip, int flag, char *name)
{
        if (!(flag & DDI_PROP_CANSLEEP))
                flag |= DDI_PROP_DONTSLEEP;
        flag |= DDI_PROP_SYSTEM_DEF | DDI_PROP_STACK_CREATE |
            DDI_PROP_UNDEF_IT | DDI_PROP_TYPE_ANY;
        return (ddi_prop_update_common(dev, dip, flag,
            name, NULL, 0, ddi_prop_fm_encode_bytes));
}

/*
 * Support for gathering dynamic properties in devinfo snapshot.
 */
void
i_ddi_prop_dyn_driver_set(dev_info_t *dip, i_ddi_prop_dyn_t *dp)
{
        DEVI(dip)->devi_prop_dyn_driver = dp;
}

i_ddi_prop_dyn_t *
i_ddi_prop_dyn_driver_get(dev_info_t *dip)
{
        return (DEVI(dip)->devi_prop_dyn_driver);
}

void
i_ddi_prop_dyn_parent_set(dev_info_t *dip, i_ddi_prop_dyn_t *dp)
{
        DEVI(dip)->devi_prop_dyn_parent = dp;
}

i_ddi_prop_dyn_t *
i_ddi_prop_dyn_parent_get(dev_info_t *dip)
{
        return (DEVI(dip)->devi_prop_dyn_parent);
}

void
i_ddi_prop_dyn_cache_invalidate(dev_info_t *dip, i_ddi_prop_dyn_t *dp)
{
        /* for now we invalidate the entire cached snapshot */
        if (dip && dp)
                i_ddi_di_cache_invalidate();
}

/* ARGSUSED */
void
ddi_prop_cache_invalidate(dev_t dev, dev_info_t *dip, char *name, int flags)
{
        /* for now we invalidate the entire cached snapshot */
        i_ddi_di_cache_invalidate();
}


/*
 * Code to search hardware layer (PROM), if it exists, on behalf of child.
 *
 * if input dip != child_dip, then call is on behalf of child
 * to search PROM, do it via ddi_prop_search_common() and ascend only
 * if allowed.
 *
 * if input dip == ch_dip (child_dip), call is on behalf of root driver,
 * to search for PROM defined props only.
 *
 * Note that the PROM search is done only if the requested dev
 * is either DDI_DEV_T_ANY or DDI_DEV_T_NONE. PROM properties
 * have no associated dev, thus are automatically associated with
 * DDI_DEV_T_NONE.
 *
 * Modifying flag DDI_PROP_NOTPROM inhibits the search in the h/w layer.
 *
 * Returns DDI_PROP_FOUND_1275 if found to indicate to framework
 * that the property resides in the prom.
 */
int
impl_ddi_bus_prop_op(dev_t dev, dev_info_t *dip, dev_info_t *ch_dip,
    ddi_prop_op_t prop_op, int mod_flags,
    char *name, caddr_t valuep, int *lengthp)
{
        int     len;
        caddr_t buffer;

        /*
         * If requested dev is DDI_DEV_T_NONE or DDI_DEV_T_ANY, then
         * look in caller's PROM if it's a self identifying device...
         *
         * Note that this is very similar to ddi_prop_op, but we
         * search the PROM instead of the s/w defined properties,
         * and we are called on by the parent driver to do this for
         * the child.
         */

        if (((dev == DDI_DEV_T_NONE) || (dev == DDI_DEV_T_ANY)) &&
            ndi_dev_is_prom_node(ch_dip) &&
            ((mod_flags & DDI_PROP_NOTPROM) == 0)) {
                len = prom_getproplen((pnode_t)DEVI(ch_dip)->devi_nodeid, name);
                if (len == -1) {
                        return (DDI_PROP_NOT_FOUND);
                }

                /*
                 * If exists only request, we're done
                 */
                if (prop_op == PROP_EXISTS) {
                        return (DDI_PROP_FOUND_1275);
                }

                /*
                 * If length only request or prop length == 0, get out
                 */
                if ((prop_op == PROP_LEN) || (len == 0)) {
                        *lengthp = len;
                        return (DDI_PROP_FOUND_1275);
                }

                /*
                 * Allocate buffer if required... (either way `buffer'
                 * is receiving address).
                 */

                switch (prop_op) {

                case PROP_LEN_AND_VAL_ALLOC:

                        buffer = kmem_alloc((size_t)len,
                            mod_flags & DDI_PROP_CANSLEEP ?
                            KM_SLEEP : KM_NOSLEEP);
                        if (buffer == NULL) {
                                return (DDI_PROP_NO_MEMORY);
                        }
                        *(caddr_t *)valuep = buffer;
                        break;

                case PROP_LEN_AND_VAL_BUF:

                        if (len > (*lengthp)) {
                                *lengthp = len;
                                return (DDI_PROP_BUF_TOO_SMALL);
                        }

                        buffer = valuep;
                        break;

                default:
                        break;
                }

                /*
                 * Call the PROM function to do the copy.
                 */
                (void) prom_getprop((pnode_t)DEVI(ch_dip)->devi_nodeid,
                    name, buffer);

                *lengthp = len; /* return the actual length to the caller */
                (void) impl_fix_props(dip, ch_dip, name, len, buffer);
                return (DDI_PROP_FOUND_1275);
        }

        return (DDI_PROP_NOT_FOUND);
}

/*
 * The ddi_bus_prop_op default bus nexus prop op function.
 *
 * Code to search hardware layer (PROM), if it exists,
 * on behalf of child, then, if appropriate, ascend and check
 * my own software defined properties...
 */
int
ddi_bus_prop_op(dev_t dev, dev_info_t *dip, dev_info_t *ch_dip,
    ddi_prop_op_t prop_op, int mod_flags,
    char *name, caddr_t valuep, int *lengthp)
{
        int     error;

        error = impl_ddi_bus_prop_op(dev, dip, ch_dip, prop_op, mod_flags,
            name, valuep, lengthp);

        if (error == DDI_PROP_SUCCESS || error == DDI_PROP_FOUND_1275 ||
            error == DDI_PROP_BUF_TOO_SMALL)
                return (error);

        if (error == DDI_PROP_NO_MEMORY) {
                cmn_err(CE_CONT, prop_no_mem_msg, name);
                return (DDI_PROP_NO_MEMORY);
        }

        /*
         * Check the 'options' node as a last resort
         */
        if ((mod_flags & DDI_PROP_DONTPASS) != 0)
                return (DDI_PROP_NOT_FOUND);

        if (ch_dip == ddi_root_node())  {
                /*
                 * As a last resort, when we've reached
                 * the top and still haven't found the
                 * property, see if the desired property
                 * is attached to the options node.
                 *
                 * The options dip is attached right after boot.
                 */
                ASSERT(options_dip != NULL);
                /*
                 * Force the "don't pass" flag to *just* see
                 * what the options node has to offer.
                 */
                return (ddi_prop_search_common(dev, options_dip, prop_op,
                    mod_flags|DDI_PROP_DONTPASS, name, valuep,
                    (uint_t *)lengthp));
        }

        /*
         * Otherwise, continue search with parent's s/w defined properties...
         * NOTE: Using `dip' in following call increments the level.
         */

        return (ddi_prop_search_common(dev, dip, prop_op, mod_flags,
            name, valuep, (uint_t *)lengthp));
}

/*
 * External property functions used by other parts of the kernel...
 */

/*
 * e_ddi_getlongprop: See comments for ddi_get_longprop.
 */

int
e_ddi_getlongprop(dev_t dev, vtype_t type, char *name, int flags,
    caddr_t valuep, int *lengthp)
{
        _NOTE(ARGUNUSED(type))
        dev_info_t *devi;
        ddi_prop_op_t prop_op = PROP_LEN_AND_VAL_ALLOC;
        int error;

        if ((devi = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (DDI_PROP_NOT_FOUND);

        error = cdev_prop_op(dev, devi, prop_op, flags, name, valuep, lengthp);
        ddi_release_devi(devi);
        return (error);
}

/*
 * e_ddi_getlongprop_buf:       See comments for ddi_getlongprop_buf.
 */

int
e_ddi_getlongprop_buf(dev_t dev, vtype_t type, char *name, int flags,
    caddr_t valuep, int *lengthp)
{
        _NOTE(ARGUNUSED(type))
        dev_info_t *devi;
        ddi_prop_op_t prop_op = PROP_LEN_AND_VAL_BUF;
        int error;

        if ((devi = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (DDI_PROP_NOT_FOUND);

        error = cdev_prop_op(dev, devi, prop_op, flags, name, valuep, lengthp);
        ddi_release_devi(devi);
        return (error);
}

/*
 * e_ddi_getprop:       See comments for ddi_getprop.
 */
int
e_ddi_getprop(dev_t dev, vtype_t type, char *name, int flags, int defvalue)
{
        _NOTE(ARGUNUSED(type))
        dev_info_t *devi;
        ddi_prop_op_t prop_op = PROP_LEN_AND_VAL_BUF;
        int     propvalue = defvalue;
        int     proplength = sizeof (int);
        int     error;

        if ((devi = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (defvalue);

        error = cdev_prop_op(dev, devi, prop_op,
            flags, name, (caddr_t)&propvalue, &proplength);
        ddi_release_devi(devi);

        if ((error == DDI_PROP_SUCCESS) && (proplength == 0))
                propvalue = 1;

        return (propvalue);
}

/*
 * e_ddi_getprop_int64:
 *
 * This is a typed interfaces, but predates typed properties. With the
 * introduction of typed properties the framework tries to ensure
 * consistent use of typed interfaces. This is why TYPE_INT64 is not
 * part of TYPE_ANY.  E_ddi_getprop_int64 is a special case where a
 * typed interface invokes legacy (non-typed) interfaces:
 * cdev_prop_op(), prop_op(9E), ddi_prop_op(9F)).  In this case the
 * fact that TYPE_INT64 is not part of TYPE_ANY matters.  To support
 * this type of lookup as a single operation we invoke the legacy
 * non-typed interfaces with the special CONSUMER_TYPED bit set. The
 * framework ddi_prop_op(9F) implementation is expected to check for
 * CONSUMER_TYPED and, if set, expand type bits beyond TYPE_ANY
 * (currently TYPE_INT64).
 */
int64_t
e_ddi_getprop_int64(dev_t dev, vtype_t type, char *name,
    int flags, int64_t defvalue)
{
        _NOTE(ARGUNUSED(type))
        dev_info_t      *devi;
        ddi_prop_op_t   prop_op = PROP_LEN_AND_VAL_BUF;
        int64_t         propvalue = defvalue;
        int             proplength = sizeof (propvalue);
        int             error;

        if ((devi = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (defvalue);

        error = cdev_prop_op(dev, devi, prop_op, flags |
            DDI_PROP_CONSUMER_TYPED, name, (caddr_t)&propvalue, &proplength);
        ddi_release_devi(devi);

        if ((error == DDI_PROP_SUCCESS) && (proplength == 0))
                propvalue = 1;

        return (propvalue);
}

/*
 * e_ddi_getproplen:    See comments for ddi_getproplen.
 */
int
e_ddi_getproplen(dev_t dev, vtype_t type, char *name, int flags, int *lengthp)
{
        _NOTE(ARGUNUSED(type))
        dev_info_t *devi;
        ddi_prop_op_t prop_op = PROP_LEN;
        int error;

        if ((devi = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (DDI_PROP_NOT_FOUND);

        error = cdev_prop_op(dev, devi, prop_op, flags, name, NULL, lengthp);
        ddi_release_devi(devi);
        return (error);
}

/*
 * Routines to get at elements of the dev_info structure
 */

/*
 * ddi_binding_name: Return the driver binding name of the devinfo node
 *              This is the name the OS used to bind the node to a driver.
 */
char *
ddi_binding_name(dev_info_t *dip)
{
        return (DEVI(dip)->devi_binding_name);
}

/*
 * ddi_driver_major: Return the major number of the driver that
 *      the supplied devinfo is bound to.  If not yet bound,
 *      DDI_MAJOR_T_NONE.
 *
 * When used by the driver bound to 'devi', this
 * function will reliably return the driver major number.
 * Other ways of determining the driver major number, such as
 *      major = ddi_name_to_major(ddi_get_name(devi));
 *      major = ddi_name_to_major(ddi_binding_name(devi));
 * can return a different result as the driver/alias binding
 * can change dynamically, and thus should be avoided.
 */
major_t
ddi_driver_major(dev_info_t *devi)
{
        return (DEVI(devi)->devi_major);
}

/*
 * ddi_driver_name: Return the normalized driver name. this is the
 *              actual driver name
 */
const char *
ddi_driver_name(dev_info_t *devi)
{
        major_t major;

        if ((major = ddi_driver_major(devi)) != DDI_MAJOR_T_NONE)
                return (ddi_major_to_name(major));

        return (ddi_node_name(devi));
}

/*
 * i_ddi_set_binding_name:      Set binding name.
 *
 *      Set the binding name to the given name.
 *      This routine is for use by the ddi implementation, not by drivers.
 */
void
i_ddi_set_binding_name(dev_info_t *dip, char *name)
{
        DEVI(dip)->devi_binding_name = name;

}

/*
 * ddi_get_name: A synonym of ddi_binding_name() ... returns a name
 * the implementation has used to bind the node to a driver.
 */
char *
ddi_get_name(dev_info_t *dip)
{
        return (DEVI(dip)->devi_binding_name);
}

/*
 * ddi_node_name: Return the name property of the devinfo node
 *              This may differ from ddi_binding_name if the node name
 *              does not define a binding to a driver (i.e. generic names).
 */
char *
ddi_node_name(dev_info_t *dip)
{
        return (DEVI(dip)->devi_node_name);
}


/*
 * ddi_get_nodeid:      Get nodeid stored in dev_info structure.
 */
int
ddi_get_nodeid(dev_info_t *dip)
{
        return (DEVI(dip)->devi_nodeid);
}

int
ddi_get_instance(dev_info_t *dip)
{
        return (DEVI(dip)->devi_instance);
}

struct dev_ops *
ddi_get_driver(dev_info_t *dip)
{
        return (DEVI(dip)->devi_ops);
}

void
ddi_set_driver(dev_info_t *dip, struct dev_ops *devo)
{
        DEVI(dip)->devi_ops = devo;
}

/*
 * ddi_set_driver_private/ddi_get_driver_private:
 * Get/set device driver private data in devinfo.
 */
void
ddi_set_driver_private(dev_info_t *dip, void *data)
{
        DEVI(dip)->devi_driver_data = data;
}

void *
ddi_get_driver_private(dev_info_t *dip)
{
        return (DEVI(dip)->devi_driver_data);
}

/*
 * ddi_get_parent, ddi_get_child, ddi_get_next_sibling
 */

dev_info_t *
ddi_get_parent(dev_info_t *dip)
{
        return ((dev_info_t *)DEVI(dip)->devi_parent);
}

dev_info_t *
ddi_get_child(dev_info_t *dip)
{
        return ((dev_info_t *)DEVI(dip)->devi_child);
}

dev_info_t *
ddi_get_next_sibling(dev_info_t *dip)
{
        return ((dev_info_t *)DEVI(dip)->devi_sibling);
}

dev_info_t *
ddi_get_next(dev_info_t *dip)
{
        return ((dev_info_t *)DEVI(dip)->devi_next);
}

void
ddi_set_next(dev_info_t *dip, dev_info_t *nextdip)
{
        DEVI(dip)->devi_next = DEVI(nextdip);
}

/*
 * ddi_root_node:               Return root node of devinfo tree
 */

dev_info_t *
ddi_root_node(void)
{
        extern dev_info_t *top_devinfo;

        return (top_devinfo);
}

/*
 * Miscellaneous functions:
 */

/*
 * Implementation specific hooks
 */

void
ddi_report_dev(dev_info_t *d)
{
        char *b;

        (void) ddi_ctlops(d, d, DDI_CTLOPS_REPORTDEV, (void *)0, (void *)0);

        /*
         * If this devinfo node has cb_ops, it's implicitly accessible from
         * userland, so we print its full name together with the instance
         * number 'abbreviation' that the driver may use internally.
         */
        if (DEVI(d)->devi_ops->devo_cb_ops != (struct cb_ops *)0 &&
            (b = kmem_zalloc(MAXPATHLEN, KM_NOSLEEP))) {
                cmn_err(CE_CONT, "?%s%d is %s\n",
                    ddi_driver_name(d), ddi_get_instance(d),
                    ddi_pathname(d, b));
                kmem_free(b, MAXPATHLEN);
        }
}

/*
 * ddi_ctlops() is described in the assembler not to buy a new register
 * window when it's called and can reduce cost in climbing the device tree
 * without using the tail call optimization.
 */
int
ddi_dev_regsize(dev_info_t *dev, uint_t rnumber, off_t *result)
{
        int ret;

        ret = ddi_ctlops(dev, dev, DDI_CTLOPS_REGSIZE,
            (void *)&rnumber, (void *)result);

        return (ret == DDI_SUCCESS ? DDI_SUCCESS : DDI_FAILURE);
}

int
ddi_dev_nregs(dev_info_t *dev, int *result)
{
        return (ddi_ctlops(dev, dev, DDI_CTLOPS_NREGS, 0, (void *)result));
}

int
ddi_dev_is_sid(dev_info_t *d)
{
        return (ddi_ctlops(d, d, DDI_CTLOPS_SIDDEV, (void *)0, (void *)0));
}

int
ddi_slaveonly(dev_info_t *d)
{
        return (ddi_ctlops(d, d, DDI_CTLOPS_SLAVEONLY, (void *)0, (void *)0));
}

int
ddi_dev_affinity(dev_info_t *a, dev_info_t *b)
{
        return (ddi_ctlops(a, a, DDI_CTLOPS_AFFINITY, (void *)b, (void *)0));
}

int
ddi_streams_driver(dev_info_t *dip)
{
        if (i_ddi_devi_attached(dip) &&
            (DEVI(dip)->devi_ops->devo_cb_ops != NULL) &&
            (DEVI(dip)->devi_ops->devo_cb_ops->cb_str != NULL))
                return (DDI_SUCCESS);
        return (DDI_FAILURE);
}

/*
 * callback free list
 */

static int ncallbacks;
static int nc_low = 170;
static int nc_med = 512;
static int nc_high = 2048;
static struct ddi_callback *callbackq;
static struct ddi_callback *callbackqfree;

/*
 * set/run callback lists
 */
struct  cbstats {
        kstat_named_t   cb_asked;
        kstat_named_t   cb_new;
        kstat_named_t   cb_run;
        kstat_named_t   cb_delete;
        kstat_named_t   cb_maxreq;
        kstat_named_t   cb_maxlist;
        kstat_named_t   cb_alloc;
        kstat_named_t   cb_runouts;
        kstat_named_t   cb_L2;
        kstat_named_t   cb_grow;
} cbstats = {
        {"asked",       KSTAT_DATA_UINT32},
        {"new",         KSTAT_DATA_UINT32},
        {"run",         KSTAT_DATA_UINT32},
        {"delete",      KSTAT_DATA_UINT32},
        {"maxreq",      KSTAT_DATA_UINT32},
        {"maxlist",     KSTAT_DATA_UINT32},
        {"alloc",       KSTAT_DATA_UINT32},
        {"runouts",     KSTAT_DATA_UINT32},
        {"L2",          KSTAT_DATA_UINT32},
        {"grow",        KSTAT_DATA_UINT32},
};

#define nc_asked        cb_asked.value.ui32
#define nc_new          cb_new.value.ui32
#define nc_run          cb_run.value.ui32
#define nc_delete       cb_delete.value.ui32
#define nc_maxreq       cb_maxreq.value.ui32
#define nc_maxlist      cb_maxlist.value.ui32
#define nc_alloc        cb_alloc.value.ui32
#define nc_runouts      cb_runouts.value.ui32
#define nc_L2           cb_L2.value.ui32
#define nc_grow         cb_grow.value.ui32

static kmutex_t ddi_callback_mutex;

/*
 * callbacks are handled using a L1/L2 cache. The L1 cache
 * comes out of kmem_cache_alloc and can expand/shrink dynamically. If
 * we can't get callbacks from the L1 cache [because pageout is doing
 * I/O at the time freemem is 0], we allocate callbacks out of the
 * L2 cache. The L2 cache is static and depends on the memory size.
 * [We might also count the number of devices at probe time and
 * allocate one structure per device and adjust for deferred attach]
 */
void
impl_ddi_callback_init(void)
{
        int     i;
        uint_t  physmegs;
        kstat_t *ksp;

        physmegs = physmem >> (20 - PAGESHIFT);
        if (physmegs < 48) {
                ncallbacks = nc_low;
        } else if (physmegs < 128) {
                ncallbacks = nc_med;
        } else {
                ncallbacks = nc_high;
        }

        /*
         * init free list
         */
        callbackq = kmem_zalloc(
            ncallbacks * sizeof (struct ddi_callback), KM_SLEEP);
        for (i = 0; i < ncallbacks-1; i++)
                callbackq[i].c_nfree = &callbackq[i+1];
        callbackqfree = callbackq;

        /* init kstats */
        if (ksp = kstat_create("unix", 0, "cbstats", "misc", KSTAT_TYPE_NAMED,
            sizeof (cbstats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL)) {
                ksp->ks_data = (void *) &cbstats;
                kstat_install(ksp);
        }

}

static void
callback_insert(int (*funcp)(caddr_t), caddr_t arg, uintptr_t *listid,
        int count)
{
        struct ddi_callback *list, *marker, *new;
        size_t size = sizeof (struct ddi_callback);

        list = marker = (struct ddi_callback *)*listid;
        while (list != NULL) {
                if (list->c_call == funcp && list->c_arg == arg) {
                        list->c_count += count;
                        return;
                }
                marker = list;
                list = list->c_nlist;
        }
        new = kmem_alloc(size, KM_NOSLEEP);
        if (new == NULL) {
                new = callbackqfree;
                if (new == NULL) {
                        new = kmem_alloc_tryhard(sizeof (struct ddi_callback),
                            &size, KM_NOSLEEP | KM_PANIC);
                        cbstats.nc_grow++;
                } else {
                        callbackqfree = new->c_nfree;
                        cbstats.nc_L2++;
                }
        }
        if (marker != NULL) {
                marker->c_nlist = new;
        } else {
                *listid = (uintptr_t)new;
        }
        new->c_size = size;
        new->c_nlist = NULL;
        new->c_call = funcp;
        new->c_arg = arg;
        new->c_count = count;
        cbstats.nc_new++;
        cbstats.nc_alloc++;
        if (cbstats.nc_alloc > cbstats.nc_maxlist)
                cbstats.nc_maxlist = cbstats.nc_alloc;
}

void
ddi_set_callback(int (*funcp)(caddr_t), caddr_t arg, uintptr_t *listid)
{
        mutex_enter(&ddi_callback_mutex);
        cbstats.nc_asked++;
        if ((cbstats.nc_asked - cbstats.nc_run) > cbstats.nc_maxreq)
                cbstats.nc_maxreq = (cbstats.nc_asked - cbstats.nc_run);
        (void) callback_insert(funcp, arg, listid, 1);
        mutex_exit(&ddi_callback_mutex);
}

static void
real_callback_run(void *Queue)
{
        int (*funcp)(caddr_t);
        caddr_t arg;
        int count, rval;
        uintptr_t *listid;
        struct ddi_callback *list, *marker;
        int check_pending = 1;
        int pending = 0;

        do {
                mutex_enter(&ddi_callback_mutex);
                listid = Queue;
                list = (struct ddi_callback *)*listid;
                if (list == NULL) {
                        mutex_exit(&ddi_callback_mutex);
                        return;
                }
                if (check_pending) {
                        marker = list;
                        while (marker != NULL) {
                                pending += marker->c_count;
                                marker = marker->c_nlist;
                        }
                        check_pending = 0;
                }
                ASSERT(pending > 0);
                ASSERT(list->c_count > 0);
                funcp = list->c_call;
                arg = list->c_arg;
                count = list->c_count;
                *(uintptr_t *)Queue = (uintptr_t)list->c_nlist;
                if (list >= &callbackq[0] &&
                    list <= &callbackq[ncallbacks-1]) {
                        list->c_nfree = callbackqfree;
                        callbackqfree = list;
                } else
                        kmem_free(list, list->c_size);

                cbstats.nc_delete++;
                cbstats.nc_alloc--;
                mutex_exit(&ddi_callback_mutex);

                do {
                        if ((rval = (*funcp)(arg)) == 0) {
                                pending -= count;
                                mutex_enter(&ddi_callback_mutex);
                                (void) callback_insert(funcp, arg, listid,
                                    count);
                                cbstats.nc_runouts++;
                        } else {
                                pending--;
                                mutex_enter(&ddi_callback_mutex);
                                cbstats.nc_run++;
                        }
                        mutex_exit(&ddi_callback_mutex);
                } while (rval != 0 && (--count > 0));
        } while (pending > 0);
}

void
ddi_run_callback(uintptr_t *listid)
{
        softcall(real_callback_run, listid);
}

/*
 * ddi_periodic_t
 * ddi_periodic_add(void (*func)(void *), void *arg, hrtime_t interval,
 *     int level)
 *
 * INTERFACE LEVEL
 *      Solaris DDI specific (Solaris DDI)
 *
 * PARAMETERS
 *      func: the callback function
 *
 *            The callback function will be invoked. The function is invoked
 *            in kernel context if the argument level passed is the zero.
 *            Otherwise it's invoked in interrupt context at the specified
 *            level.
 *
 *       arg: the argument passed to the callback function
 *
 *  interval: interval time
 *
 *    level : callback interrupt level
 *
 *            If the value is the zero, the callback function is invoked
 *            in kernel context. If the value is more than the zero, but
 *            less than or equal to ten, the callback function is invoked in
 *            interrupt context at the specified interrupt level, which may
 *            be used for real time applications.
 *
 *            This value must be in range of 0-10, which can be a numeric
 *            number or a pre-defined macro (DDI_IPL_0, ... , DDI_IPL_10).
 *
 * DESCRIPTION
 *      ddi_periodic_add(9F) schedules the specified function to be
 *      periodically invoked in the interval time.
 *
 *      As well as timeout(9F), the exact time interval over which the function
 *      takes effect cannot be guaranteed, but the value given is a close
 *      approximation.
 *
 *      Drivers waiting on behalf of processes with real-time constraints must
 *      pass non-zero value with the level argument to ddi_periodic_add(9F).
 *
 * RETURN VALUES
 *      ddi_periodic_add(9F) returns a non-zero opaque value (ddi_periodic_t),
 *      which must be used for ddi_periodic_delete(9F) to specify the request.
 *
 * CONTEXT
 *      ddi_periodic_add(9F) can be called in user or kernel context, but
 *      it cannot be called in interrupt context, which is different from
 *      timeout(9F).
 */
ddi_periodic_t
ddi_periodic_add(void (*func)(void *), void *arg, hrtime_t interval, int level)
{
        /*
         * Sanity check of the argument level.
         */
        if (level < DDI_IPL_0 || level > DDI_IPL_10)
                cmn_err(CE_PANIC,
                    "ddi_periodic_add: invalid interrupt level (%d).", level);

        /*
         * Sanity check of the context. ddi_periodic_add() cannot be
         * called in either interrupt context or high interrupt context.
         */
        if (servicing_interrupt())
                cmn_err(CE_PANIC,
                    "ddi_periodic_add: called in (high) interrupt context.");

        return ((ddi_periodic_t)i_timeout(func, arg, interval, level));
}

/*
 * void
 * ddi_periodic_delete(ddi_periodic_t req)
 *
 * INTERFACE LEVEL
 *     Solaris DDI specific (Solaris DDI)
 *
 * PARAMETERS
 *     req: ddi_periodic_t opaque value ddi_periodic_add(9F) returned
 *     previously.
 *
 * DESCRIPTION
 *     ddi_periodic_delete(9F) cancels the ddi_periodic_add(9F) request
 *     previously requested.
 *
 *     ddi_periodic_delete(9F) will not return until the pending request
 *     is canceled or executed.
 *
 *     As well as untimeout(9F), calling ddi_periodic_delete(9F) for a
 *     timeout which is either running on another CPU, or has already
 *     completed causes no problems. However, unlike untimeout(9F), there is
 *     no restrictions on the lock which might be held across the call to
 *     ddi_periodic_delete(9F).
 *
 *     Drivers should be structured with the understanding that the arrival of
 *     both an interrupt and a timeout for that interrupt can occasionally
 *     occur, in either order.
 *
 * CONTEXT
 *     ddi_periodic_delete(9F) can be called in user or kernel context, but
 *     it cannot be called in interrupt context, which is different from
 *     untimeout(9F).
 */
void
ddi_periodic_delete(ddi_periodic_t req)
{
        /*
         * Sanity check of the context. ddi_periodic_delete() cannot be
         * called in either interrupt context or high interrupt context.
         */
        if (servicing_interrupt())
                cmn_err(CE_PANIC,
                    "ddi_periodic_delete: called in (high) interrupt context.");

        i_untimeout((timeout_t)req);
}

dev_info_t *
nodevinfo(dev_t dev, int otyp)
{
        _NOTE(ARGUNUSED(dev, otyp))
        return ((dev_info_t *)0);
}

/*
 * A driver should support its own getinfo(9E) entry point. This function
 * is provided as a convenience for ON drivers that don't expect their
 * getinfo(9E) entry point to be called. A driver that uses this must not
 * call ddi_create_minor_node.
 */
int
ddi_no_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
        _NOTE(ARGUNUSED(dip, infocmd, arg, result))
        return (DDI_FAILURE);
}

/*
 * A driver should support its own getinfo(9E) entry point. This function
 * is provided as a convenience for ON drivers that where the minor number
 * is the instance. Drivers that do not have 1:1 mapping must implement
 * their own getinfo(9E) function.
 */
int
ddi_getinfo_1to1(dev_info_t *dip, ddi_info_cmd_t infocmd,
    void *arg, void **result)
{
        _NOTE(ARGUNUSED(dip))
        int     instance;

        if (infocmd != DDI_INFO_DEVT2INSTANCE)
                return (DDI_FAILURE);

        instance = getminor((dev_t)(uintptr_t)arg);
        *result = (void *)(uintptr_t)instance;
        return (DDI_SUCCESS);
}

int
ddifail(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
        _NOTE(ARGUNUSED(devi, cmd))
        return (DDI_FAILURE);
}

int
ddi_no_dma_map(dev_info_t *dip, dev_info_t *rdip,
    struct ddi_dma_req *dmareqp, ddi_dma_handle_t *handlep)
{
        _NOTE(ARGUNUSED(dip, rdip, dmareqp, handlep))
        return (DDI_DMA_NOMAPPING);
}

int
ddi_no_dma_allochdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_attr_t *attr,
    int (*waitfp)(caddr_t), caddr_t arg, ddi_dma_handle_t *handlep)
{
        _NOTE(ARGUNUSED(dip, rdip, attr, waitfp, arg, handlep))
        return (DDI_DMA_BADATTR);
}

int
ddi_no_dma_freehdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle)
{
        _NOTE(ARGUNUSED(dip, rdip, handle))
        return (DDI_FAILURE);
}

int
ddi_no_dma_bindhdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, struct ddi_dma_req *dmareq,
    ddi_dma_cookie_t *cp, uint_t *ccountp)
{
        _NOTE(ARGUNUSED(dip, rdip, handle, dmareq, cp, ccountp))
        return (DDI_DMA_NOMAPPING);
}

int
ddi_no_dma_unbindhdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle)
{
        _NOTE(ARGUNUSED(dip, rdip, handle))
        return (DDI_FAILURE);
}

int
ddi_no_dma_flush(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, off_t off, size_t len,
    uint_t cache_flags)
{
        _NOTE(ARGUNUSED(dip, rdip, handle, off, len, cache_flags))
        return (DDI_FAILURE);
}

int
ddi_no_dma_win(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, uint_t win, off_t *offp,
    size_t *lenp, ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
        _NOTE(ARGUNUSED(dip, rdip, handle, win, offp, lenp, cookiep, ccountp))
        return (DDI_FAILURE);
}

int
ddi_no_dma_mctl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, enum ddi_dma_ctlops request,
    off_t *offp, size_t *lenp, caddr_t *objp, uint_t flags)
{
        _NOTE(ARGUNUSED(dip, rdip, handle, request, offp, lenp, objp, flags))
        return (DDI_FAILURE);
}

void
ddivoid(void)
{}

int
nochpoll(dev_t dev, short events, int anyyet, short *reventsp,
    struct pollhead **pollhdrp)
{
        _NOTE(ARGUNUSED(dev, events, anyyet, reventsp, pollhdrp))
        return (ENXIO);
}

cred_t *
ddi_get_cred(void)
{
        return (CRED());
}

clock_t
ddi_get_lbolt(void)
{
        return ((clock_t)lbolt_hybrid());
}

int64_t
ddi_get_lbolt64(void)
{
        return (lbolt_hybrid());
}

time_t
ddi_get_time(void)
{
        time_t  now;

        if ((now = gethrestime_sec()) == 0) {
                timestruc_t ts;
                mutex_enter(&tod_lock);
                ts = tod_get();
                mutex_exit(&tod_lock);
                return (ts.tv_sec);
        } else {
                return (now);
        }
}

pid_t
ddi_get_pid(void)
{
        return (ttoproc(curthread)->p_pid);
}

kt_did_t
ddi_get_kt_did(void)
{
        return (curthread->t_did);
}

/*
 * This function returns B_TRUE if the caller can reasonably expect that a call
 * to cv_wait_sig(9F), cv_timedwait_sig(9F), or qwait_sig(9F) could be awakened
 * by user-level signal.  If it returns B_FALSE, then the caller should use
 * other means to make certain that the wait will not hang "forever."
 *
 * It does not check the signal mask, nor for reception of any particular
 * signal.
 *
 * Currently, a thread can receive a signal if it's not a kernel thread and it
 * is not in the middle of exit(2) tear-down.  Threads that are in that
 * tear-down effectively convert cv_wait_sig to cv_wait, cv_timedwait_sig to
 * cv_timedwait, and qwait_sig to qwait.
 */
boolean_t
ddi_can_receive_sig(void)
{
        proc_t *pp;

        if (curthread->t_proc_flag & TP_LWPEXIT)
                return (B_FALSE);
        if ((pp = ttoproc(curthread)) == NULL)
                return (B_FALSE);
        return (pp->p_as != &kas);
}

/*
 * Swap bytes in 16-bit [half-]words
 */
void
swab(void *src, void *dst, size_t nbytes)
{
        uchar_t *pf = (uchar_t *)src;
        uchar_t *pt = (uchar_t *)dst;
        uchar_t tmp;
        int nshorts;

        nshorts = nbytes >> 1;

        while (--nshorts >= 0) {
                tmp = *pf++;
                *pt++ = *pf++;
                *pt++ = tmp;
        }
}

static void
ddi_append_minor_node(dev_info_t *ddip, struct ddi_minor_data *dmdp)
{
        int                     circ;
        struct ddi_minor_data   *dp;

        ndi_devi_enter(ddip, &circ);
        if ((dp = DEVI(ddip)->devi_minor) == (struct ddi_minor_data *)NULL) {
                DEVI(ddip)->devi_minor = dmdp;
        } else {
                while (dp->next != (struct ddi_minor_data *)NULL)
                        dp = dp->next;
                dp->next = dmdp;
        }
        ndi_devi_exit(ddip, circ);
}

/*
 * Part of the obsolete SunCluster DDI Hooks.
 * Keep for binary compatibility
 */
minor_t
ddi_getiminor(dev_t dev)
{
        return (getminor(dev));
}

static int
i_log_devfs_minor_create(dev_info_t *dip, char *minor_name)
{
        int se_flag;
        int kmem_flag;
        int se_err;
        char *pathname, *class_name;
        sysevent_t *ev = NULL;
        sysevent_id_t eid;
        sysevent_value_t se_val;
        sysevent_attr_list_t *ev_attr_list = NULL;

        /* determine interrupt context */
        se_flag = (servicing_interrupt()) ? SE_NOSLEEP : SE_SLEEP;
        kmem_flag = (se_flag == SE_SLEEP) ? KM_SLEEP : KM_NOSLEEP;

        i_ddi_di_cache_invalidate();

#ifdef DEBUG
        if ((se_flag == SE_NOSLEEP) && sunddi_debug) {
                cmn_err(CE_CONT, "ddi_create_minor_node: called from "
                    "interrupt level by driver %s",
                    ddi_driver_name(dip));
        }
#endif /* DEBUG */

        ev = sysevent_alloc(EC_DEVFS, ESC_DEVFS_MINOR_CREATE, EP_DDI, se_flag);
        if (ev == NULL) {
                goto fail;
        }

        pathname = kmem_alloc(MAXPATHLEN, kmem_flag);
        if (pathname == NULL) {
                sysevent_free(ev);
                goto fail;
        }

        (void) ddi_pathname(dip, pathname);
        ASSERT(strlen(pathname));
        se_val.value_type = SE_DATA_TYPE_STRING;
        se_val.value.sv_string = pathname;
        if (sysevent_add_attr(&ev_attr_list, DEVFS_PATHNAME,
            &se_val, se_flag) != 0) {
                kmem_free(pathname, MAXPATHLEN);
                sysevent_free(ev);
                goto fail;
        }
        kmem_free(pathname, MAXPATHLEN);

        /* add the device class attribute */
        if ((class_name = i_ddi_devi_class(dip)) != NULL) {
                se_val.value_type = SE_DATA_TYPE_STRING;
                se_val.value.sv_string = class_name;
                if (sysevent_add_attr(&ev_attr_list,
                    DEVFS_DEVI_CLASS, &se_val, SE_SLEEP) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        goto fail;
                }
        }

        /*
         * allow for NULL minor names
         */
        if (minor_name != NULL) {
                se_val.value.sv_string = minor_name;
                if (sysevent_add_attr(&ev_attr_list, DEVFS_MINOR_NAME,
                    &se_val, se_flag) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        sysevent_free(ev);
                        goto fail;
                }
        }

        if (sysevent_attach_attributes(ev, ev_attr_list) != 0) {
                sysevent_free_attr(ev_attr_list);
                sysevent_free(ev);
                goto fail;
        }

        if ((se_err = log_sysevent(ev, se_flag, &eid)) != 0) {
                if (se_err == SE_NO_TRANSPORT) {
                        cmn_err(CE_WARN, "/devices or /dev may not be current "
                            "for driver %s (%s). Run devfsadm -i %s",
                            ddi_driver_name(dip), "syseventd not responding",
                            ddi_driver_name(dip));
                } else {
                        sysevent_free(ev);
                        goto fail;
                }
        }

        sysevent_free(ev);
        return (DDI_SUCCESS);
fail:
        cmn_err(CE_WARN, "/devices or /dev may not be current "
            "for driver %s. Run devfsadm -i %s",
            ddi_driver_name(dip), ddi_driver_name(dip));
        return (DDI_SUCCESS);
}

/*
 * failing to remove a minor node is not of interest
 * therefore we do not generate an error message
 */
static int
i_log_devfs_minor_remove(dev_info_t *dip, char *minor_name)
{
        char *pathname, *class_name;
        sysevent_t *ev;
        sysevent_id_t eid;
        sysevent_value_t se_val;
        sysevent_attr_list_t *ev_attr_list = NULL;

        /*
         * only log ddi_remove_minor_node() calls outside the scope
         * of attach/detach reconfigurations and when the dip is
         * still initialized.
         */
        if (DEVI_IS_ATTACHING(dip) || DEVI_IS_DETACHING(dip) ||
            (i_ddi_node_state(dip) < DS_INITIALIZED)) {
                return (DDI_SUCCESS);
        }

        i_ddi_di_cache_invalidate();

        ev = sysevent_alloc(EC_DEVFS, ESC_DEVFS_MINOR_REMOVE, EP_DDI, SE_SLEEP);
        if (ev == NULL) {
                return (DDI_SUCCESS);
        }

        pathname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
        if (pathname == NULL) {
                sysevent_free(ev);
                return (DDI_SUCCESS);
        }

        (void) ddi_pathname(dip, pathname);
        ASSERT(strlen(pathname));
        se_val.value_type = SE_DATA_TYPE_STRING;
        se_val.value.sv_string = pathname;
        if (sysevent_add_attr(&ev_attr_list, DEVFS_PATHNAME,
            &se_val, SE_SLEEP) != 0) {
                kmem_free(pathname, MAXPATHLEN);
                sysevent_free(ev);
                return (DDI_SUCCESS);
        }

        kmem_free(pathname, MAXPATHLEN);

        /*
         * allow for NULL minor names
         */
        if (minor_name != NULL) {
                se_val.value.sv_string = minor_name;
                if (sysevent_add_attr(&ev_attr_list, DEVFS_MINOR_NAME,
                    &se_val, SE_SLEEP) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        goto fail;
                }
        }

        if ((class_name = i_ddi_devi_class(dip)) != NULL) {
                /* add the device class, driver name and instance attributes */

                se_val.value_type = SE_DATA_TYPE_STRING;
                se_val.value.sv_string = class_name;
                if (sysevent_add_attr(&ev_attr_list,
                    DEVFS_DEVI_CLASS, &se_val, SE_SLEEP) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        goto fail;
                }

                se_val.value_type = SE_DATA_TYPE_STRING;
                se_val.value.sv_string = (char *)ddi_driver_name(dip);
                if (sysevent_add_attr(&ev_attr_list,
                    DEVFS_DRIVER_NAME, &se_val, SE_SLEEP) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        goto fail;
                }

                se_val.value_type = SE_DATA_TYPE_INT32;
                se_val.value.sv_int32 = ddi_get_instance(dip);
                if (sysevent_add_attr(&ev_attr_list,
                    DEVFS_INSTANCE, &se_val, SE_SLEEP) != 0) {
                        sysevent_free_attr(ev_attr_list);
                        goto fail;
                }

        }

        if (sysevent_attach_attributes(ev, ev_attr_list) != 0) {
                sysevent_free_attr(ev_attr_list);
        } else {
                (void) log_sysevent(ev, SE_SLEEP, &eid);
        }
fail:
        sysevent_free(ev);
        return (DDI_SUCCESS);
}

/*
 * Derive the device class of the node.
 * Device class names aren't defined yet. Until this is done we use
 * devfs event subclass names as device class names.
 */
static int
derive_devi_class(dev_info_t *dip, char *node_type, int flag)
{
        int rv = DDI_SUCCESS;

        if (i_ddi_devi_class(dip) == NULL) {
                if (strncmp(node_type, DDI_NT_BLOCK,
                    sizeof (DDI_NT_BLOCK) - 1) == 0 &&
                    (node_type[sizeof (DDI_NT_BLOCK) - 1] == '\0' ||
                    node_type[sizeof (DDI_NT_BLOCK) - 1] == ':') &&
                    strcmp(node_type, DDI_NT_FD) != 0) {

                        rv = i_ddi_set_devi_class(dip, ESC_DISK, flag);

                } else if (strncmp(node_type, DDI_NT_NET,
                    sizeof (DDI_NT_NET) - 1) == 0 &&
                    (node_type[sizeof (DDI_NT_NET) - 1] == '\0' ||
                    node_type[sizeof (DDI_NT_NET) - 1] == ':')) {

                        rv = i_ddi_set_devi_class(dip, ESC_NETWORK, flag);

                } else if (strncmp(node_type, DDI_NT_PRINTER,
                    sizeof (DDI_NT_PRINTER) - 1) == 0 &&
                    (node_type[sizeof (DDI_NT_PRINTER) - 1] == '\0' ||
                    node_type[sizeof (DDI_NT_PRINTER) - 1] == ':')) {

                        rv = i_ddi_set_devi_class(dip, ESC_PRINTER, flag);

                } else if (strncmp(node_type, DDI_PSEUDO,
                    sizeof (DDI_PSEUDO) -1) == 0 &&
                    (strncmp(ESC_LOFI, ddi_node_name(dip),
                    sizeof (ESC_LOFI) -1) == 0)) {
                        rv = i_ddi_set_devi_class(dip, ESC_LOFI, flag);
                }
        }

        return (rv);
}

/*
 * Check compliance with PSARC 2003/375:
 *
 * The name must contain only characters a-z, A-Z, 0-9 or _ and it must not
 * exceed IFNAMSIZ (16) characters in length.
 */
static boolean_t
verify_name(char *name)
{
        size_t  len = strlen(name);
        char    *cp;

        if (len == 0 || len > IFNAMSIZ)
                return (B_FALSE);

        for (cp = name; *cp != '\0'; cp++) {
                if (!isalnum(*cp) && *cp != '_')
                        return (B_FALSE);
        }

        return (B_TRUE);
}

/*
 * ddi_create_minor_common:     Create a  ddi_minor_data structure and
 *                              attach it to the given devinfo node.
 */

int
ddi_create_minor_common(dev_info_t *dip, char *name, int spec_type,
    minor_t minor_num, char *node_type, int flag, ddi_minor_type mtype,
    const char *read_priv, const char *write_priv, mode_t priv_mode)
{
        struct ddi_minor_data *dmdp;
        major_t major;

        if (spec_type != S_IFCHR && spec_type != S_IFBLK)
                return (DDI_FAILURE);

        if (name == NULL)
                return (DDI_FAILURE);

        /*
         * Log a message if the minor number the driver is creating
         * is not expressible on the on-disk filesystem (currently
         * this is limited to 18 bits both by UFS). The device can
         * be opened via devfs, but not by device special files created
         * via mknod().
         */
        if (minor_num > L_MAXMIN32) {
                cmn_err(CE_WARN,
                    "%s%d:%s minor 0x%x too big for 32-bit applications",
                    ddi_driver_name(dip), ddi_get_instance(dip),
                    name, minor_num);
                return (DDI_FAILURE);
        }

        /* dip must be bound and attached */
        major = ddi_driver_major(dip);
        ASSERT(major != DDI_MAJOR_T_NONE);

        /*
         * Default node_type to DDI_PSEUDO and issue notice in debug mode
         */
        if (node_type == NULL) {
                node_type = DDI_PSEUDO;
                NDI_CONFIG_DEBUG((CE_NOTE, "!illegal node_type NULL for %s%d "
                    " minor node %s; default to DDI_PSEUDO",
                    ddi_driver_name(dip), ddi_get_instance(dip), name));
        }

        /*
         * If the driver is a network driver, ensure that the name falls within
         * the interface naming constraints specified by PSARC/2003/375.
         */
        if (strcmp(node_type, DDI_NT_NET) == 0) {
                if (!verify_name(name))
                        return (DDI_FAILURE);

                if (mtype == DDM_MINOR) {
                        struct devnames *dnp = &devnamesp[major];

                        /* Mark driver as a network driver */
                        LOCK_DEV_OPS(&dnp->dn_lock);
                        dnp->dn_flags |= DN_NETWORK_DRIVER;

                        /*
                         * If this minor node is created during the device
                         * attachment, this is a physical network device.
                         * Mark the driver as a physical network driver.
                         */
                        if (DEVI_IS_ATTACHING(dip))
                                dnp->dn_flags |= DN_NETWORK_PHYSDRIVER;
                        UNLOCK_DEV_OPS(&dnp->dn_lock);
                }
        }

        if (mtype == DDM_MINOR) {
                if (derive_devi_class(dip,  node_type, KM_NOSLEEP) !=
                    DDI_SUCCESS)
                        return (DDI_FAILURE);
        }

        /*
         * Take care of minor number information for the node.
         */

        if ((dmdp = kmem_zalloc(sizeof (struct ddi_minor_data),
            KM_NOSLEEP)) == NULL) {
                return (DDI_FAILURE);
        }
        if ((dmdp->ddm_name = i_ddi_strdup(name, KM_NOSLEEP)) == NULL) {
                kmem_free(dmdp, sizeof (struct ddi_minor_data));
                return (DDI_FAILURE);
        }
        dmdp->dip = dip;
        dmdp->ddm_dev = makedevice(major, minor_num);
        dmdp->ddm_spec_type = spec_type;
        dmdp->ddm_node_type = node_type;
        dmdp->type = mtype;
        if (flag & CLONE_DEV) {
                dmdp->type = DDM_ALIAS;
                dmdp->ddm_dev = makedevice(ddi_driver_major(clone_dip), major);
        }
        if (flag & PRIVONLY_DEV) {
                dmdp->ddm_flags |= DM_NO_FSPERM;
        }
        if (read_priv || write_priv) {
                dmdp->ddm_node_priv =
                    devpolicy_priv_by_name(read_priv, write_priv);
        }
        dmdp->ddm_priv_mode = priv_mode;

        ddi_append_minor_node(dip, dmdp);

        /*
         * only log ddi_create_minor_node() calls which occur
         * outside the scope of attach(9e)/detach(9e) reconfigurations
         */
        if (!(DEVI_IS_ATTACHING(dip) || DEVI_IS_DETACHING(dip)) &&
            mtype != DDM_INTERNAL_PATH) {
                (void) i_log_devfs_minor_create(dip, name);
        }

        /*
         * Check if any dacf rules match the creation of this minor node
         */
        dacfc_match_create_minor(name, node_type, dip, dmdp, flag);
        return (DDI_SUCCESS);
}

int
ddi_create_minor_node(dev_info_t *dip, char *name, int spec_type,
    minor_t minor_num, char *node_type, int flag)
{
        return (ddi_create_minor_common(dip, name, spec_type, minor_num,
            node_type, flag, DDM_MINOR, NULL, NULL, 0));
}

int
ddi_create_priv_minor_node(dev_info_t *dip, char *name, int spec_type,
    minor_t minor_num, char *node_type, int flag,
    const char *rdpriv, const char *wrpriv, mode_t priv_mode)
{
        return (ddi_create_minor_common(dip, name, spec_type, minor_num,
            node_type, flag, DDM_MINOR, rdpriv, wrpriv, priv_mode));
}

int
ddi_create_default_minor_node(dev_info_t *dip, char *name, int spec_type,
    minor_t minor_num, char *node_type, int flag)
{
        return (ddi_create_minor_common(dip, name, spec_type, minor_num,
            node_type, flag, DDM_DEFAULT, NULL, NULL, 0));
}

/*
 * Internal (non-ddi) routine for drivers to export names known
 * to the kernel (especially ddi_pathname_to_dev_t and friends)
 * but not exported externally to /dev
 */
int
ddi_create_internal_pathname(dev_info_t *dip, char *name, int spec_type,
    minor_t minor_num)
{
        return (ddi_create_minor_common(dip, name, spec_type, minor_num,
            "internal", 0, DDM_INTERNAL_PATH, NULL, NULL, 0));
}

void
ddi_remove_minor_node(dev_info_t *dip, char *name)
{
        int                     circ;
        struct ddi_minor_data   *dmdp, *dmdp1;
        struct ddi_minor_data   **dmdp_prev;

        ndi_devi_enter(dip, &circ);
        dmdp_prev = &DEVI(dip)->devi_minor;
        dmdp = DEVI(dip)->devi_minor;
        while (dmdp != NULL) {
                dmdp1 = dmdp->next;
                if ((name == NULL || (dmdp->ddm_name != NULL &&
                    strcmp(name, dmdp->ddm_name) == 0))) {
                        if (dmdp->ddm_name != NULL) {
                                if (dmdp->type != DDM_INTERNAL_PATH)
                                        (void) i_log_devfs_minor_remove(dip,
                                            dmdp->ddm_name);
                                kmem_free(dmdp->ddm_name,
                                    strlen(dmdp->ddm_name) + 1);
                        }
                        /*
                         * Release device privilege, if any.
                         * Release dacf client data associated with this minor
                         * node by storing NULL.
                         */
                        if (dmdp->ddm_node_priv)
                                dpfree(dmdp->ddm_node_priv);
                        dacf_store_info((dacf_infohdl_t)dmdp, NULL);
                        kmem_free(dmdp, sizeof (struct ddi_minor_data));
                        *dmdp_prev = dmdp1;
                        /*
                         * OK, we found it, so get out now -- if we drive on,
                         * we will strcmp against garbage.  See 1139209.
                         */
                        if (name != NULL)
                                break;
                } else {
                        dmdp_prev = &dmdp->next;
                }
                dmdp = dmdp1;
        }
        ndi_devi_exit(dip, circ);
}


int
ddi_in_panic()
{
        return (panicstr != NULL);
}


/*
 * Find first bit set in a mask (returned counting from 1 up)
 */

int
ddi_ffs(long mask)
{
        return (ffs(mask));
}

/*
 * Find last bit set. Take mask and clear
 * all but the most significant bit, and
 * then let ffs do the rest of the work.
 *
 * Algorithm courtesy of Steve Chessin.
 */

int
ddi_fls(long mask)
{
        while (mask) {
                long nx;

                if ((nx = (mask & (mask - 1))) == 0)
                        break;
                mask = nx;
        }
        return (ffs(mask));
}

/*
 * The ddi_soft_state_* routines comprise generic storage management utilities
 * for driver soft state structures (in "the old days," this was done with
 * statically sized array - big systems and dynamic loading and unloading
 * make heap allocation more attractive).
 */

/*
 * Allocate a set of pointers to 'n_items' objects of size 'size'
 * bytes.  Each pointer is initialized to nil.
 *
 * The 'size' and 'n_items' values are stashed in the opaque
 * handle returned to the caller.
 *
 * This implementation interprets 'set of pointers' to mean 'array
 * of pointers' but note that nothing in the interface definition
 * precludes an implementation that uses, for example, a linked list.
 * However there should be a small efficiency gain from using an array
 * at lookup time.
 *
 * NOTE As an optimization, we make our growable array allocations in
 *      powers of two (bytes), since that's how much kmem_alloc (currently)
 *      gives us anyway.  It should save us some free/realloc's ..
 *
 *      As a further optimization, we make the growable array start out
 *      with MIN_N_ITEMS in it.
 */

#define MIN_N_ITEMS     8       /* 8 void *'s == 32 bytes */

int
ddi_soft_state_init(void **state_p, size_t size, size_t n_items)
{
        i_ddi_soft_state        *ss;

        if (state_p == NULL || size == 0)
                return (EINVAL);

        ss = kmem_zalloc(sizeof (*ss), KM_SLEEP);
        mutex_init(&ss->lock, NULL, MUTEX_DRIVER, NULL);
        ss->size = size;

        if (n_items < MIN_N_ITEMS)
                ss->n_items = MIN_N_ITEMS;
        else {
                int bitlog;

                if ((bitlog = ddi_fls(n_items)) == ddi_ffs(n_items))
                        bitlog--;
                ss->n_items = 1 << bitlog;
        }

        ASSERT(ss->n_items >= n_items);

        ss->array = kmem_zalloc(ss->n_items * sizeof (void *), KM_SLEEP);

        *state_p = ss;
        return (0);
}

/*
 * Allocate a state structure of size 'size' to be associated
 * with item 'item'.
 *
 * In this implementation, the array is extended to
 * allow the requested offset, if needed.
 */
int
ddi_soft_state_zalloc(void *state, int item)
{
        i_ddi_soft_state        *ss = (i_ddi_soft_state *)state;
        void                    **array;
        void                    *new_element;

        if ((state == NULL) || (item < 0))
                return (DDI_FAILURE);

        mutex_enter(&ss->lock);
        if (ss->size == 0) {
                mutex_exit(&ss->lock);
                cmn_err(CE_WARN, "ddi_soft_state_zalloc: bad handle: %s",
                    mod_containing_pc(caller()));
                return (DDI_FAILURE);
        }

        array = ss->array;      /* NULL if ss->n_items == 0 */
        ASSERT(ss->n_items != 0 && array != NULL);

        /*
         * refuse to tread on an existing element
         */
        if (item < ss->n_items && array[item] != NULL) {
                mutex_exit(&ss->lock);
                return (DDI_FAILURE);
        }

        /*
         * Allocate a new element to plug in
         */
        new_element = kmem_zalloc(ss->size, KM_SLEEP);

        /*
         * Check if the array is big enough, if not, grow it.
         */
        if (item >= ss->n_items) {
                void                    **new_array;
                size_t                  new_n_items;
                struct i_ddi_soft_state *dirty;

                /*
                 * Allocate a new array of the right length, copy
                 * all the old pointers to the new array, then
                 * if it exists at all, put the old array on the
                 * dirty list.
                 *
                 * Note that we can't kmem_free() the old array.
                 *
                 * Why -- well the 'get' operation is 'mutex-free', so we
                 * can't easily catch a suspended thread that is just about
                 * to dereference the array we just grew out of.  So we
                 * cons up a header and put it on a list of 'dirty'
                 * pointer arrays.  (Dirty in the sense that there may
                 * be suspended threads somewhere that are in the middle
                 * of referencing them).  Fortunately, we -can- garbage
                 * collect it all at ddi_soft_state_fini time.
                 */
                new_n_items = ss->n_items;
                while (new_n_items < (1 + item))
                        new_n_items <<= 1;      /* double array size .. */

                ASSERT(new_n_items >= (1 + item));      /* sanity check! */

                new_array = kmem_zalloc(new_n_items * sizeof (void *),
                    KM_SLEEP);
                /*
                 * Copy the pointers into the new array
                 */
                bcopy(array, new_array, ss->n_items * sizeof (void *));

                /*
                 * Save the old array on the dirty list
                 */
                dirty = kmem_zalloc(sizeof (*dirty), KM_SLEEP);
                dirty->array = ss->array;
                dirty->n_items = ss->n_items;
                dirty->next = ss->next;
                ss->next = dirty;

                ss->array = (array = new_array);
                ss->n_items = new_n_items;
        }

        ASSERT(array != NULL && item < ss->n_items && array[item] == NULL);

        array[item] = new_element;

        mutex_exit(&ss->lock);
        return (DDI_SUCCESS);
}

/*
 * Fetch a pointer to the allocated soft state structure.
 *
 * This is designed to be cheap.
 *
 * There's an argument that there should be more checking for
 * nil pointers and out of bounds on the array.. but we do a lot
 * of that in the alloc/free routines.
 *
 * An array has the convenience that we don't need to lock read-access
 * to it c.f. a linked list.  However our "expanding array" strategy
 * means that we should hold a readers lock on the i_ddi_soft_state
 * structure.
 *
 * However, from a performance viewpoint, we need to do it without
 * any locks at all -- this also makes it a leaf routine.  The algorithm
 * is 'lock-free' because we only discard the pointer arrays at
 * ddi_soft_state_fini() time.
 */
void *
ddi_get_soft_state(void *state, int item)
{
        i_ddi_soft_state        *ss = (i_ddi_soft_state *)state;

        ASSERT((ss != NULL) && (item >= 0));

        if (item < ss->n_items && ss->array != NULL)
                return (ss->array[item]);
        return (NULL);
}

/*
 * Free the state structure corresponding to 'item.'   Freeing an
 * element that has either gone or was never allocated is not
 * considered an error.  Note that we free the state structure, but
 * we don't shrink our pointer array, or discard 'dirty' arrays,
 * since even a few pointers don't really waste too much memory.
 *
 * Passing an item number that is out of bounds, or a null pointer will
 * provoke an error message.
 */
void
ddi_soft_state_free(void *state, int item)
{
        i_ddi_soft_state        *ss = (i_ddi_soft_state *)state;
        void                    **array;
        void                    *element;
        static char             msg[] = "ddi_soft_state_free:";

        if (ss == NULL) {
                cmn_err(CE_WARN, "%s null handle: %s",
                    msg, mod_containing_pc(caller()));
                return;
        }

        element = NULL;

        mutex_enter(&ss->lock);

        if ((array = ss->array) == NULL || ss->size == 0) {
                cmn_err(CE_WARN, "%s bad handle: %s",
                    msg, mod_containing_pc(caller()));
        } else if (item < 0 || item >= ss->n_items) {
                cmn_err(CE_WARN, "%s item %d not in range [0..%lu]: %s",
                    msg, item, ss->n_items - 1, mod_containing_pc(caller()));
        } else if (array[item] != NULL) {
                element = array[item];
                array[item] = NULL;
        }

        mutex_exit(&ss->lock);

        if (element)
                kmem_free(element, ss->size);
}

/*
 * Free the entire set of pointers, and any
 * soft state structures contained therein.
 *
 * Note that we don't grab the ss->lock mutex, even though
 * we're inspecting the various fields of the data structure.
 *
 * There is an implicit assumption that this routine will
 * never run concurrently with any of the above on this
 * particular state structure i.e. by the time the driver
 * calls this routine, there should be no other threads
 * running in the driver.
 */
void
ddi_soft_state_fini(void **state_p)
{
        i_ddi_soft_state        *ss, *dirty;
        int                     item;
        static char             msg[] = "ddi_soft_state_fini:";

        if (state_p == NULL ||
            (ss = (i_ddi_soft_state *)(*state_p)) == NULL) {
                cmn_err(CE_WARN, "%s null handle: %s",
                    msg, mod_containing_pc(caller()));
                return;
        }

        if (ss->size == 0) {
                cmn_err(CE_WARN, "%s bad handle: %s",
                    msg, mod_containing_pc(caller()));
                return;
        }

        if (ss->n_items > 0) {
                for (item = 0; item < ss->n_items; item++)
                        ddi_soft_state_free(ss, item);
                kmem_free(ss->array, ss->n_items * sizeof (void *));
        }

        /*
         * Now delete any dirty arrays from previous 'grow' operations
         */
        for (dirty = ss->next; dirty; dirty = ss->next) {
                ss->next = dirty->next;
                kmem_free(dirty->array, dirty->n_items * sizeof (void *));
                kmem_free(dirty, sizeof (*dirty));
        }

        mutex_destroy(&ss->lock);
        kmem_free(ss, sizeof (*ss));

        *state_p = NULL;
}

#define SS_N_ITEMS_PER_HASH     16
#define SS_MIN_HASH_SZ          16
#define SS_MAX_HASH_SZ          4096

int
ddi_soft_state_bystr_init(ddi_soft_state_bystr **state_p, size_t size,
    int n_items)
{
        i_ddi_soft_state_bystr  *sss;
        int                     hash_sz;

        ASSERT(state_p && size && n_items);
        if ((state_p == NULL) || (size == 0) || (n_items == 0))
                return (EINVAL);

        /* current implementation is based on hash, convert n_items to hash */
        hash_sz = n_items / SS_N_ITEMS_PER_HASH;
        if (hash_sz < SS_MIN_HASH_SZ)
                hash_sz = SS_MIN_HASH_SZ;
        else if (hash_sz > SS_MAX_HASH_SZ)
                hash_sz = SS_MAX_HASH_SZ;

        /* allocate soft_state pool */
        sss = kmem_zalloc(sizeof (*sss), KM_SLEEP);
        sss->ss_size = size;
        sss->ss_mod_hash = mod_hash_create_strhash("soft_state_bystr",
            hash_sz, mod_hash_null_valdtor);
        *state_p = (ddi_soft_state_bystr *)sss;
        return (0);
}

int
ddi_soft_state_bystr_zalloc(ddi_soft_state_bystr *state, const char *str)
{
        i_ddi_soft_state_bystr  *sss = (i_ddi_soft_state_bystr *)state;
        void                    *sso;
        char                    *dup_str;

        ASSERT(sss && str && sss->ss_mod_hash);
        if ((sss == NULL) || (str == NULL) || (sss->ss_mod_hash == NULL))
                return (DDI_FAILURE);
        sso = kmem_zalloc(sss->ss_size, KM_SLEEP);
        dup_str = i_ddi_strdup((char *)str, KM_SLEEP);
        if (mod_hash_insert(sss->ss_mod_hash,
            (mod_hash_key_t)dup_str, (mod_hash_val_t)sso) == 0)
                return (DDI_SUCCESS);

        /*
         * The only error from an strhash insert is caused by a duplicate key.
         * We refuse to tread on an existing elements, so free and fail.
         */
        kmem_free(dup_str, strlen(dup_str) + 1);
        kmem_free(sso, sss->ss_size);
        return (DDI_FAILURE);
}

void *
ddi_soft_state_bystr_get(ddi_soft_state_bystr *state, const char *str)
{
        i_ddi_soft_state_bystr  *sss = (i_ddi_soft_state_bystr *)state;
        void                    *sso;

        ASSERT(sss && str && sss->ss_mod_hash);
        if ((sss == NULL) || (str == NULL) || (sss->ss_mod_hash == NULL))
                return (NULL);

        if (mod_hash_find(sss->ss_mod_hash,
            (mod_hash_key_t)str, (mod_hash_val_t *)&sso) == 0)
                return (sso);
        return (NULL);
}

void
ddi_soft_state_bystr_free(ddi_soft_state_bystr *state, const char *str)
{
        i_ddi_soft_state_bystr  *sss = (i_ddi_soft_state_bystr *)state;
        void                    *sso;

        ASSERT(sss && str && sss->ss_mod_hash);
        if ((sss == NULL) || (str == NULL) || (sss->ss_mod_hash == NULL))
                return;

        (void) mod_hash_remove(sss->ss_mod_hash,
            (mod_hash_key_t)str, (mod_hash_val_t *)&sso);
        kmem_free(sso, sss->ss_size);
}

void
ddi_soft_state_bystr_fini(ddi_soft_state_bystr **state_p)
{
        i_ddi_soft_state_bystr  *sss;

        ASSERT(state_p);
        if (state_p == NULL)
                return;

        sss = (i_ddi_soft_state_bystr *)(*state_p);
        if (sss == NULL)
                return;

        ASSERT(sss->ss_mod_hash);
        if (sss->ss_mod_hash) {
                mod_hash_destroy_strhash(sss->ss_mod_hash);
                sss->ss_mod_hash = NULL;
        }

        kmem_free(sss, sizeof (*sss));
        *state_p = NULL;
}

/*
 * The ddi_strid_* routines provide string-to-index management utilities.
 */
/* allocate and initialize an strid set */
int
ddi_strid_init(ddi_strid **strid_p, int n_items)
{
        i_ddi_strid     *ss;
        int             hash_sz;

        if (strid_p == NULL)
                return (DDI_FAILURE);

        /* current implementation is based on hash, convert n_items to hash */
        hash_sz = n_items / SS_N_ITEMS_PER_HASH;
        if (hash_sz < SS_MIN_HASH_SZ)
                hash_sz = SS_MIN_HASH_SZ;
        else if (hash_sz > SS_MAX_HASH_SZ)
                hash_sz = SS_MAX_HASH_SZ;

        ss = kmem_alloc(sizeof (*ss), KM_SLEEP);
        ss->strid_chunksz = n_items;
        ss->strid_spacesz = n_items;
        ss->strid_space = id_space_create("strid", 1, n_items);
        ss->strid_bystr = mod_hash_create_strhash("strid_bystr", hash_sz,
            mod_hash_null_valdtor);
        ss->strid_byid = mod_hash_create_idhash("strid_byid", hash_sz,
            mod_hash_null_valdtor);
        *strid_p = (ddi_strid *)ss;
        return (DDI_SUCCESS);
}

/* allocate an id mapping within the specified set for str, return id */
static id_t
i_ddi_strid_alloc(ddi_strid *strid, char *str)
{
        i_ddi_strid     *ss = (i_ddi_strid *)strid;
        id_t            id;
        char            *s;

        ASSERT(ss && str);
        if ((ss == NULL) || (str == NULL))
                return (0);

        /*
         * Allocate an id using VM_FIRSTFIT in order to keep allocated id
         * range as compressed as possible.  This is important to minimize
         * the amount of space used when the id is used as a ddi_soft_state
         * index by the caller.
         *
         * If the id list is exhausted, increase the size of the list
         * by the chuck size specified in ddi_strid_init and reattempt
         * the allocation
         */
        if ((id = id_allocff_nosleep(ss->strid_space)) == (id_t)-1) {
                id_space_extend(ss->strid_space, ss->strid_spacesz,
                    ss->strid_spacesz + ss->strid_chunksz);
                ss->strid_spacesz += ss->strid_chunksz;
                if ((id = id_allocff_nosleep(ss->strid_space)) == (id_t)-1)
                        return (0);
        }

        /*
         * NOTE: since we create and destroy in unison we can save space by
         * using bystr key as the byid value.  This means destroy must occur
         * in (byid, bystr) order.
         */
        s = i_ddi_strdup(str, KM_SLEEP);
        if (mod_hash_insert(ss->strid_bystr, (mod_hash_key_t)s,
            (mod_hash_val_t)(intptr_t)id) != 0) {
                ddi_strid_free(strid, id);
                return (0);
        }
        if (mod_hash_insert(ss->strid_byid, (mod_hash_key_t)(intptr_t)id,
            (mod_hash_val_t)s) != 0) {
                ddi_strid_free(strid, id);
                return (0);
        }

        /* NOTE: s if freed on mod_hash_destroy by mod_hash_strval_dtor */
        return (id);
}

/* allocate an id mapping within the specified set for str, return id */
id_t
ddi_strid_alloc(ddi_strid *strid, char *str)
{
        return (i_ddi_strid_alloc(strid, str));
}

/* return the id within the specified strid given the str */
id_t
ddi_strid_str2id(ddi_strid *strid, char *str)
{
        i_ddi_strid     *ss = (i_ddi_strid *)strid;
        id_t            id = 0;
        mod_hash_val_t  hv;

        ASSERT(ss && str);
        if (ss && str && (mod_hash_find(ss->strid_bystr,
            (mod_hash_key_t)str, &hv) == 0))
                id = (int)(intptr_t)hv;
        return (id);
}

/* return str within the specified strid given the id */
char *
ddi_strid_id2str(ddi_strid *strid, id_t id)
{
        i_ddi_strid     *ss = (i_ddi_strid *)strid;
        char            *str = NULL;
        mod_hash_val_t  hv;

        ASSERT(ss && id > 0);
        if (ss && (id > 0) && (mod_hash_find(ss->strid_byid,
            (mod_hash_key_t)(uintptr_t)id, &hv) == 0))
                str = (char *)hv;
        return (str);
}

/* free the id mapping within the specified strid */
void
ddi_strid_free(ddi_strid *strid, id_t id)
{
        i_ddi_strid     *ss = (i_ddi_strid *)strid;
        char            *str;

        ASSERT(ss && id > 0);
        if ((ss == NULL) || (id <= 0))
                return;

        /* bystr key is byid value: destroy order must be (byid, bystr) */
        str = ddi_strid_id2str(strid, id);
        (void) mod_hash_destroy(ss->strid_byid, (mod_hash_key_t)(uintptr_t)id);
        id_free(ss->strid_space, id);

        if (str)
                (void) mod_hash_destroy(ss->strid_bystr, (mod_hash_key_t)str);
}

/* destroy the strid set */
void
ddi_strid_fini(ddi_strid **strid_p)
{
        i_ddi_strid     *ss;

        ASSERT(strid_p);
        if (strid_p == NULL)
                return;

        ss = (i_ddi_strid *)(*strid_p);
        if (ss == NULL)
                return;

        /* bystr key is byid value: destroy order must be (byid, bystr) */
        if (ss->strid_byid)
                mod_hash_destroy_hash(ss->strid_byid);
        if (ss->strid_byid)
                mod_hash_destroy_hash(ss->strid_bystr);
        if (ss->strid_space)
                id_space_destroy(ss->strid_space);
        kmem_free(ss, sizeof (*ss));
        *strid_p = NULL;
}

/*
 * This sets the devi_addr entry in the dev_info structure 'dip' to 'name'.
 * Storage is double buffered to prevent updates during devi_addr use -
 * double buffering is adaquate for reliable ddi_deviname() consumption.
 * The double buffer is not freed until dev_info structure destruction
 * (by i_ddi_free_node).
 */
void
ddi_set_name_addr(dev_info_t *dip, char *name)
{
        char    *buf = DEVI(dip)->devi_addr_buf;
        char    *newaddr;

        if (buf == NULL) {
                buf = kmem_zalloc(2 * MAXNAMELEN, KM_SLEEP);
                DEVI(dip)->devi_addr_buf = buf;
        }

        if (name) {
                ASSERT(strlen(name) < MAXNAMELEN);
                newaddr = (DEVI(dip)->devi_addr == buf) ?
                    (buf + MAXNAMELEN) : buf;
                (void) strlcpy(newaddr, name, MAXNAMELEN);
        } else
                newaddr = NULL;

        DEVI(dip)->devi_addr = newaddr;
}

char *
ddi_get_name_addr(dev_info_t *dip)
{
        return (DEVI(dip)->devi_addr);
}

void
ddi_set_parent_data(dev_info_t *dip, void *pd)
{
        DEVI(dip)->devi_parent_data = pd;
}

void *
ddi_get_parent_data(dev_info_t *dip)
{
        return (DEVI(dip)->devi_parent_data);
}

/*
 * ddi_name_to_major: returns the major number of a named module,
 * derived from the current driver alias binding.
 *
 * Caveat: drivers should avoid the use of this function, in particular
 * together with ddi_get_name/ddi_binding name, as per
 *      major = ddi_name_to_major(ddi_get_name(devi));
 * ddi_name_to_major() relies on the state of the device/alias binding,
 * which can and does change dynamically as aliases are administered
 * over time.  An attached device instance cannot rely on the major
 * number returned by ddi_name_to_major() to match its own major number.
 *
 * For driver use, ddi_driver_major() reliably returns the major number
 * for the module to which the device was bound at attach time over
 * the life of the instance.
 *      major = ddi_driver_major(dev_info_t *)
 */
major_t
ddi_name_to_major(char *name)
{
        return (mod_name_to_major(name));
}

/*
 * ddi_major_to_name: Returns the module name bound to a major number.
 */
char *
ddi_major_to_name(major_t major)
{
        return (mod_major_to_name(major));
}

/*
 * Return the name of the devinfo node pointed at by 'dip' in the buffer
 * pointed at by 'name.'  A devinfo node is named as a result of calling
 * ddi_initchild().
 *
 * Note: the driver must be held before calling this function!
 */
char *
ddi_deviname(dev_info_t *dip, char *name)
{
        char *addrname;
        char none = '\0';

        if (dip == ddi_root_node()) {
                *name = '\0';
                return (name);
        }

        if (i_ddi_node_state(dip) < DS_BOUND) {
                addrname = &none;
        } else {
                /*
                 * Use ddi_get_name_addr() without checking state so we get
                 * a unit-address if we are called after ddi_set_name_addr()
                 * by nexus DDI_CTL_INITCHILD code, but before completing
                 * node promotion to DS_INITIALIZED.  We currently have
                 * two situations where we are called in this state:
                 *   o  For framework processing of a path-oriented alias.
                 *   o  If a SCSA nexus driver calls ddi_devid_register()
                 *      from it's tran_tgt_init(9E) implementation.
                 */
                addrname = ddi_get_name_addr(dip);
                if (addrname == NULL)
                        addrname = &none;
        }

        if (*addrname == '\0') {
                (void) sprintf(name, "/%s", ddi_node_name(dip));
        } else {
                (void) sprintf(name, "/%s@%s", ddi_node_name(dip), addrname);
        }

        return (name);
}

/*
 * Spits out the name of device node, typically name@addr, for a given node,
 * using the driver name, not the nodename.
 *
 * Used by match_parent. Not to be used elsewhere.
 */
char *
i_ddi_parname(dev_info_t *dip, char *name)
{
        char *addrname;

        if (dip == ddi_root_node()) {
                *name = '\0';
                return (name);
        }

        ASSERT(i_ddi_node_state(dip) >= DS_INITIALIZED);

        if (*(addrname = ddi_get_name_addr(dip)) == '\0')
                (void) sprintf(name, "%s", ddi_binding_name(dip));
        else
                (void) sprintf(name, "%s@%s", ddi_binding_name(dip), addrname);
        return (name);
}

static char *
pathname_work(dev_info_t *dip, char *path)
{
        char *bp;

        if (dip == ddi_root_node()) {
                *path = '\0';
                return (path);
        }
        (void) pathname_work(ddi_get_parent(dip), path);
        bp = path + strlen(path);
        (void) ddi_deviname(dip, bp);
        return (path);
}

char *
ddi_pathname(dev_info_t *dip, char *path)
{
        return (pathname_work(dip, path));
}

char *
ddi_pathname_minor(struct ddi_minor_data *dmdp, char *path)
{
        if (dmdp->dip == NULL)
                *path = '\0';
        else {
                (void) ddi_pathname(dmdp->dip, path);
                if (dmdp->ddm_name) {
                        (void) strcat(path, ":");
                        (void) strcat(path, dmdp->ddm_name);
                }
        }
        return (path);
}

static char *
pathname_work_obp(dev_info_t *dip, char *path)
{
        char *bp;
        char *obp_path;

        /*
         * look up the "obp-path" property, return the path if it exists
         */
        if (ddi_prop_lookup_string(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
            "obp-path", &obp_path) == DDI_PROP_SUCCESS) {
                (void) strcpy(path, obp_path);
                ddi_prop_free(obp_path);
                return (path);
        }

        /*
         * stop at root, no obp path
         */
        if (dip == ddi_root_node()) {
                return (NULL);
        }

        obp_path = pathname_work_obp(ddi_get_parent(dip), path);
        if (obp_path == NULL)
                return (NULL);

        /*
         * append our component to parent's obp path
         */
        bp = path + strlen(path);
        if (*(bp - 1) != '/')
                (void) strcat(bp++, "/");
        (void) ddi_deviname(dip, bp);
        return (path);
}

/*
 * return the 'obp-path' based path for the given node, or NULL if the node
 * does not have a different obp path. NOTE: Unlike ddi_pathname, this
 * function can't be called from interrupt context (since we need to
 * lookup a string property).
 */
char *
ddi_pathname_obp(dev_info_t *dip, char *path)
{
        ASSERT(!servicing_interrupt());
        if (dip == NULL || path == NULL)
                return (NULL);

        /* split work into a separate function to aid debugging */
        return (pathname_work_obp(dip, path));
}

int
ddi_pathname_obp_set(dev_info_t *dip, char *component)
{
        dev_info_t *pdip;
        char *obp_path = NULL;
        int rc = DDI_FAILURE;

        if (dip == NULL)
                return (DDI_FAILURE);

        obp_path = kmem_zalloc(MAXPATHLEN, KM_SLEEP);

        pdip = ddi_get_parent(dip);

        if (ddi_pathname_obp(pdip, obp_path) == NULL) {
                (void) ddi_pathname(pdip, obp_path);
        }

        if (component) {
                (void) strncat(obp_path, "/", MAXPATHLEN);
                (void) strncat(obp_path, component, MAXPATHLEN);
        }
        rc = ndi_prop_update_string(DDI_DEV_T_NONE, dip, "obp-path",
            obp_path);

        if (obp_path)
                kmem_free(obp_path, MAXPATHLEN);

        return (rc);
}

/*
 * Given a dev_t, return the pathname of the corresponding device in the
 * buffer pointed at by "path."  The buffer is assumed to be large enough
 * to hold the pathname of the device (MAXPATHLEN).
 *
 * The pathname of a device is the pathname of the devinfo node to which
 * the device "belongs," concatenated with the character ':' and the name
 * of the minor node corresponding to the dev_t.  If spec_type is 0 then
 * just the pathname of the devinfo node is returned without driving attach
 * of that node.  For a non-zero spec_type, an attach is performed and a
 * search of the minor list occurs.
 *
 * It is possible that the path associated with the dev_t is not
 * currently available in the devinfo tree.  In order to have a
 * dev_t, a device must have been discovered before, which means
 * that the path is always in the instance tree.  The one exception
 * to this is if the dev_t is associated with a pseudo driver, in
 * which case the device must exist on the pseudo branch of the
 * devinfo tree as a result of parsing .conf files.
 */
int
ddi_dev_pathname(dev_t devt, int spec_type, char *path)
{
        int             circ;
        major_t         major = getmajor(devt);
        int             instance;
        dev_info_t      *dip;
        char            *minorname;
        char            *drvname;

        if (major >= devcnt)
                goto fail;
        if (major == clone_major) {
                /* clone has no minor nodes, manufacture the path here */
                if ((drvname = ddi_major_to_name(getminor(devt))) == NULL)
                        goto fail;

                (void) snprintf(path, MAXPATHLEN, "%s:%s", CLONE_PATH, drvname);
                return (DDI_SUCCESS);
        }

        /* extract instance from devt (getinfo(9E) DDI_INFO_DEVT2INSTANCE). */
        if ((instance = dev_to_instance(devt)) == -1)
                goto fail;

        /* reconstruct the path given the major/instance */
        if (e_ddi_majorinstance_to_path(major, instance, path) != DDI_SUCCESS)
                goto fail;

        /* if spec_type given we must drive attach and search minor nodes */
        if ((spec_type == S_IFCHR) || (spec_type == S_IFBLK)) {
                /* attach the path so we can search minors */
                if ((dip = e_ddi_hold_devi_by_path(path, 0)) == NULL)
                        goto fail;

                /* Add minorname to path. */
                ndi_devi_enter(dip, &circ);
                minorname = i_ddi_devtspectype_to_minorname(dip,
                    devt, spec_type);
                if (minorname) {
                        (void) strcat(path, ":");
                        (void) strcat(path, minorname);
                }
                ndi_devi_exit(dip, circ);
                ddi_release_devi(dip);
                if (minorname == NULL)
                        goto fail;
        }
        ASSERT(strlen(path) < MAXPATHLEN);
        return (DDI_SUCCESS);

fail:   *path = 0;
        return (DDI_FAILURE);
}

/*
 * Given a major number and an instance, return the path.
 * This interface does NOT drive attach.
 */
int
e_ddi_majorinstance_to_path(major_t major, int instance, char *path)
{
        struct devnames *dnp;
        dev_info_t      *dip;

        if ((major >= devcnt) || (instance == -1)) {
                *path = 0;
                return (DDI_FAILURE);
        }

        /* look for the major/instance in the instance tree */
        if (e_ddi_instance_majorinstance_to_path(major, instance,
            path) == DDI_SUCCESS) {
                ASSERT(strlen(path) < MAXPATHLEN);
                return (DDI_SUCCESS);
        }

        /*
         * Not in instance tree, find the instance on the per driver list and
         * construct path to instance via ddi_pathname(). This is how paths
         * down the 'pseudo' branch are constructed.
         */
        dnp = &(devnamesp[major]);
        LOCK_DEV_OPS(&(dnp->dn_lock));
        for (dip = dnp->dn_head; dip;
            dip = (dev_info_t *)DEVI(dip)->devi_next) {
                /* Skip if instance does not match. */
                if (DEVI(dip)->devi_instance != instance)
                        continue;

                /*
                 * An ndi_hold_devi() does not prevent DS_INITIALIZED->DS_BOUND
                 * node demotion, so it is not an effective way of ensuring
                 * that the ddi_pathname result has a unit-address.  Instead,
                 * we reverify the node state after calling ddi_pathname().
                 */
                if (i_ddi_node_state(dip) >= DS_INITIALIZED) {
                        (void) ddi_pathname(dip, path);
                        if (i_ddi_node_state(dip) < DS_INITIALIZED)
                                continue;
                        UNLOCK_DEV_OPS(&(dnp->dn_lock));
                        ASSERT(strlen(path) < MAXPATHLEN);
                        return (DDI_SUCCESS);
                }
        }
        UNLOCK_DEV_OPS(&(dnp->dn_lock));

        /* can't reconstruct the path */
        *path = 0;
        return (DDI_FAILURE);
}

#define GLD_DRIVER_PPA "SUNW,gld_v0_ppa"

/*
 * Given the dip for a network interface return the ppa for that interface.
 *
 * In all cases except GLD v0 drivers, the ppa == instance.
 * In the case of GLD v0 drivers, the ppa is equal to the attach order.
 * So for these drivers when the attach routine calls gld_register(),
 * the GLD framework creates an integer property called "gld_driver_ppa"
 * that can be queried here.
 *
 * The only time this function is used is when a system is booting over nfs.
 * In this case the system has to resolve the pathname of the boot device
 * to it's ppa.
 */
int
i_ddi_devi_get_ppa(dev_info_t *dip)
{
        return (ddi_prop_get_int(DDI_DEV_T_ANY, dip,
            DDI_PROP_DONTPASS | DDI_PROP_NOTPROM,
            GLD_DRIVER_PPA, ddi_get_instance(dip)));
}

/*
 * i_ddi_devi_set_ppa() should only be called from gld_register()
 * and only for GLD v0 drivers
 */
void
i_ddi_devi_set_ppa(dev_info_t *dip, int ppa)
{
        (void) e_ddi_prop_update_int(DDI_DEV_T_NONE, dip, GLD_DRIVER_PPA, ppa);
}


/*
 * Private DDI Console bell functions.
 */
void
ddi_ring_console_bell(clock_t duration)
{
        if (ddi_console_bell_func != NULL)
                (*ddi_console_bell_func)(duration);
}

void
ddi_set_console_bell(void (*bellfunc)(clock_t duration))
{
        ddi_console_bell_func = bellfunc;
}

int
ddi_dma_alloc_handle(dev_info_t *dip, ddi_dma_attr_t *attr,
        int (*waitfp)(caddr_t), caddr_t arg, ddi_dma_handle_t *handlep)
{
        int (*funcp)() = ddi_dma_allochdl;
        ddi_dma_attr_t dma_attr;
        struct bus_ops *bop;

        if (attr == (ddi_dma_attr_t *)0)
                return (DDI_DMA_BADATTR);

        dma_attr = *attr;

        bop = DEVI(dip)->devi_ops->devo_bus_ops;
        if (bop && bop->bus_dma_allochdl)
                funcp = bop->bus_dma_allochdl;

        return ((*funcp)(dip, dip, &dma_attr, waitfp, arg, handlep));
}

void
ddi_dma_free_handle(ddi_dma_handle_t *handlep)
{
        ddi_dma_handle_t h = *handlep;
        (void) ddi_dma_freehdl(HD, HD, h);
}

static uintptr_t dma_mem_list_id = 0;


int
ddi_dma_mem_alloc(ddi_dma_handle_t handle, size_t length,
        ddi_device_acc_attr_t *accattrp, uint_t flags,
        int (*waitfp)(caddr_t), caddr_t arg, caddr_t *kaddrp,
        size_t *real_length, ddi_acc_handle_t *handlep)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        dev_info_t *dip = hp->dmai_rdip;
        ddi_acc_hdl_t *ap;
        ddi_dma_attr_t *attrp = &hp->dmai_attr;
        uint_t sleepflag, xfermodes;
        int (*fp)(caddr_t);
        int rval;

        if (waitfp == DDI_DMA_SLEEP)
                fp = (int (*)())KM_SLEEP;
        else if (waitfp == DDI_DMA_DONTWAIT)
                fp = (int (*)())KM_NOSLEEP;
        else
                fp = waitfp;
        *handlep = impl_acc_hdl_alloc(fp, arg);
        if (*handlep == NULL)
                return (DDI_FAILURE);

        /* check if the cache attributes are supported */
        if (i_ddi_check_cache_attr(flags) == B_FALSE)
                return (DDI_FAILURE);

        /*
         * Transfer the meaningful bits to xfermodes.
         * Double-check if the 3rd party driver correctly sets the bits.
         * If not, set DDI_DMA_STREAMING to keep compatibility.
         */
        xfermodes = flags & (DDI_DMA_CONSISTENT | DDI_DMA_STREAMING);
        if (xfermodes == 0) {
                xfermodes = DDI_DMA_STREAMING;
        }

        /*
         * initialize the common elements of data access handle
         */
        ap = impl_acc_hdl_get(*handlep);
        ap->ah_vers = VERS_ACCHDL;
        ap->ah_dip = dip;
        ap->ah_offset = 0;
        ap->ah_len = 0;
        ap->ah_xfermodes = flags;
        ap->ah_acc = *accattrp;

        sleepflag = ((waitfp == DDI_DMA_SLEEP) ? 1 : 0);
        if (xfermodes == DDI_DMA_CONSISTENT) {
                rval = i_ddi_mem_alloc(dip, attrp, length, sleepflag,
                    flags, accattrp, kaddrp, NULL, ap);
                *real_length = length;
        } else {
                rval = i_ddi_mem_alloc(dip, attrp, length, sleepflag,
                    flags, accattrp, kaddrp, real_length, ap);
        }
        if (rval == DDI_SUCCESS) {
                ap->ah_len = (off_t)(*real_length);
                ap->ah_addr = *kaddrp;
        } else {
                impl_acc_hdl_free(*handlep);
                *handlep = (ddi_acc_handle_t)NULL;
                if (waitfp != DDI_DMA_SLEEP && waitfp != DDI_DMA_DONTWAIT) {
                        ddi_set_callback(waitfp, arg, &dma_mem_list_id);
                }
                rval = DDI_FAILURE;
        }
        return (rval);
}

void
ddi_dma_mem_free(ddi_acc_handle_t *handlep)
{
        ddi_acc_hdl_t *ap;

        ap = impl_acc_hdl_get(*handlep);
        ASSERT(ap);

        i_ddi_mem_free((caddr_t)ap->ah_addr, ap);

        /*
         * free the handle
         */
        impl_acc_hdl_free(*handlep);
        *handlep = (ddi_acc_handle_t)NULL;

        if (dma_mem_list_id != 0) {
                ddi_run_callback(&dma_mem_list_id);
        }
}

int
ddi_dma_buf_bind_handle(ddi_dma_handle_t handle, struct buf *bp,
        uint_t flags, int (*waitfp)(caddr_t), caddr_t arg,
        ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        dev_info_t *dip, *rdip;
        struct ddi_dma_req dmareq;
        int (*funcp)();

        dmareq.dmar_flags = flags;
        dmareq.dmar_fp = waitfp;
        dmareq.dmar_arg = arg;
        dmareq.dmar_object.dmao_size = (uint_t)bp->b_bcount;

        if (bp->b_flags & B_PAGEIO) {
                dmareq.dmar_object.dmao_type = DMA_OTYP_PAGES;
                dmareq.dmar_object.dmao_obj.pp_obj.pp_pp = bp->b_pages;
                dmareq.dmar_object.dmao_obj.pp_obj.pp_offset =
                    (uint_t)(((uintptr_t)bp->b_un.b_addr) & MMU_PAGEOFFSET);
        } else {
                dmareq.dmar_object.dmao_obj.virt_obj.v_addr = bp->b_un.b_addr;
                if (bp->b_flags & B_SHADOW) {
                        dmareq.dmar_object.dmao_obj.virt_obj.v_priv =
                            bp->b_shadow;
                        dmareq.dmar_object.dmao_type = DMA_OTYP_BUFVADDR;
                } else {
                        dmareq.dmar_object.dmao_type =
                            (bp->b_flags & (B_PHYS | B_REMAPPED)) ?
                            DMA_OTYP_BUFVADDR : DMA_OTYP_VADDR;
                        dmareq.dmar_object.dmao_obj.virt_obj.v_priv = NULL;
                }

                /*
                 * If the buffer has no proc pointer, or the proc
                 * struct has the kernel address space, or the buffer has
                 * been marked B_REMAPPED (meaning that it is now
                 * mapped into the kernel's address space), then
                 * the address space is kas (kernel address space).
                 */
                if ((bp->b_proc == NULL) || (bp->b_proc->p_as == &kas) ||
                    (bp->b_flags & B_REMAPPED)) {
                        dmareq.dmar_object.dmao_obj.virt_obj.v_as = 0;
                } else {
                        dmareq.dmar_object.dmao_obj.virt_obj.v_as =
                            bp->b_proc->p_as;
                }
        }

        dip = rdip = hp->dmai_rdip;
        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_bindhdl;
        funcp = DEVI(rdip)->devi_bus_dma_bindfunc;
        return ((*funcp)(dip, rdip, handle, &dmareq, cookiep, ccountp));
}

int
ddi_dma_addr_bind_handle(ddi_dma_handle_t handle, struct as *as,
        caddr_t addr, size_t len, uint_t flags, int (*waitfp)(caddr_t),
        caddr_t arg, ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        dev_info_t *dip, *rdip;
        struct ddi_dma_req dmareq;
        int (*funcp)();

        if (len == (uint_t)0) {
                return (DDI_DMA_NOMAPPING);
        }
        dmareq.dmar_flags = flags;
        dmareq.dmar_fp = waitfp;
        dmareq.dmar_arg = arg;
        dmareq.dmar_object.dmao_size = len;
        dmareq.dmar_object.dmao_type = DMA_OTYP_VADDR;
        dmareq.dmar_object.dmao_obj.virt_obj.v_as = as;
        dmareq.dmar_object.dmao_obj.virt_obj.v_addr = addr;
        dmareq.dmar_object.dmao_obj.virt_obj.v_priv = NULL;

        dip = rdip = hp->dmai_rdip;
        if (dip != ddi_root_node())
                dip = (dev_info_t *)DEVI(dip)->devi_bus_dma_bindhdl;
        funcp = DEVI(rdip)->devi_bus_dma_bindfunc;
        return ((*funcp)(dip, rdip, handle, &dmareq, cookiep, ccountp));
}

void
ddi_dma_nextcookie(ddi_dma_handle_t handle, ddi_dma_cookie_t *cookiep)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        ddi_dma_cookie_t *cp;

        cp = hp->dmai_cookie;
        ASSERT(cp);

        cookiep->dmac_notused = cp->dmac_notused;
        cookiep->dmac_type = cp->dmac_type;
        cookiep->dmac_address = cp->dmac_address;
        cookiep->dmac_size = cp->dmac_size;
        hp->dmai_cookie++;
}

int
ddi_dma_numwin(ddi_dma_handle_t handle, uint_t *nwinp)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        if ((hp->dmai_rflags & DDI_DMA_PARTIAL) == 0) {
                return (DDI_FAILURE);
        } else {
                *nwinp = hp->dmai_nwin;
                return (DDI_SUCCESS);
        }
}

int
ddi_dma_getwin(ddi_dma_handle_t h, uint_t win, off_t *offp,
        size_t *lenp, ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
        int (*funcp)() = ddi_dma_win;
        struct bus_ops *bop;

        bop = DEVI(HD)->devi_ops->devo_bus_ops;
        if (bop && bop->bus_dma_win)
                funcp = bop->bus_dma_win;

        return ((*funcp)(HD, HD, h, win, offp, lenp, cookiep, ccountp));
}

int
ddi_dma_set_sbus64(ddi_dma_handle_t h, ulong_t burstsizes)
{
        return (ddi_dma_mctl(HD, HD, h, DDI_DMA_SET_SBUS64, 0,
            &burstsizes, 0, 0));
}

int
i_ddi_dma_fault_check(ddi_dma_impl_t *hp)
{
        return (hp->dmai_fault);
}

int
ddi_check_dma_handle(ddi_dma_handle_t handle)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        int (*check)(ddi_dma_impl_t *);

        if ((check = hp->dmai_fault_check) == NULL)
                check = i_ddi_dma_fault_check;

        return (((*check)(hp) == DDI_SUCCESS) ? DDI_SUCCESS : DDI_FAILURE);
}

void
i_ddi_dma_set_fault(ddi_dma_handle_t handle)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        void (*notify)(ddi_dma_impl_t *);

        if (!hp->dmai_fault) {
                hp->dmai_fault = 1;
                if ((notify = hp->dmai_fault_notify) != NULL)
                        (*notify)(hp);
        }
}

void
i_ddi_dma_clr_fault(ddi_dma_handle_t handle)
{
        ddi_dma_impl_t *hp = (ddi_dma_impl_t *)handle;
        void (*notify)(ddi_dma_impl_t *);

        if (hp->dmai_fault) {
                hp->dmai_fault = 0;
                if ((notify = hp->dmai_fault_notify) != NULL)
                        (*notify)(hp);
        }
}

/*
 * register mapping routines.
 */
int
ddi_regs_map_setup(dev_info_t *dip, uint_t rnumber, caddr_t *addrp,
        offset_t offset, offset_t len, ddi_device_acc_attr_t *accattrp,
        ddi_acc_handle_t *handle)
{
        ddi_map_req_t mr;
        ddi_acc_hdl_t *hp;
        int result;

        /*
         * Allocate and initialize the common elements of data access handle.
         */
        *handle = impl_acc_hdl_alloc(KM_SLEEP, NULL);
        hp = impl_acc_hdl_get(*handle);
        hp->ah_vers = VERS_ACCHDL;
        hp->ah_dip = dip;
        hp->ah_rnumber = rnumber;
        hp->ah_offset = offset;
        hp->ah_len = len;
        hp->ah_acc = *accattrp;

        /*
         * Set up the mapping request and call to parent.
         */
        mr.map_op = DDI_MO_MAP_LOCKED;
        mr.map_type = DDI_MT_RNUMBER;
        mr.map_obj.rnumber = rnumber;
        mr.map_prot = PROT_READ | PROT_WRITE;
        mr.map_flags = DDI_MF_KERNEL_MAPPING;
        mr.map_handlep = hp;
        mr.map_vers = DDI_MAP_VERSION;
        result = ddi_map(dip, &mr, offset, len, addrp);

        /*
         * check for end result
         */
        if (result != DDI_SUCCESS) {
                impl_acc_hdl_free(*handle);
                *handle = (ddi_acc_handle_t)NULL;
        } else {
                hp->ah_addr = *addrp;
        }

        return (result);
}

void
ddi_regs_map_free(ddi_acc_handle_t *handlep)
{
        ddi_map_req_t mr;
        ddi_acc_hdl_t *hp;

        hp = impl_acc_hdl_get(*handlep);
        ASSERT(hp);

        mr.map_op = DDI_MO_UNMAP;
        mr.map_type = DDI_MT_RNUMBER;
        mr.map_obj.rnumber = hp->ah_rnumber;
        mr.map_prot = PROT_READ | PROT_WRITE;
        mr.map_flags = DDI_MF_KERNEL_MAPPING;
        mr.map_handlep = hp;
        mr.map_vers = DDI_MAP_VERSION;

        /*
         * Call my parent to unmap my regs.
         */
        (void) ddi_map(hp->ah_dip, &mr, hp->ah_offset,
            hp->ah_len, &hp->ah_addr);
        /*
         * free the handle
         */
        impl_acc_hdl_free(*handlep);
        *handlep = (ddi_acc_handle_t)NULL;
}

int
ddi_device_zero(ddi_acc_handle_t handle, caddr_t dev_addr, size_t bytecount,
        ssize_t dev_advcnt, uint_t dev_datasz)
{
        uint8_t *b;
        uint16_t *w;
        uint32_t *l;
        uint64_t *ll;

        /* check for total byte count is multiple of data transfer size */
        if (bytecount != ((bytecount / dev_datasz) * dev_datasz))
                return (DDI_FAILURE);

        switch (dev_datasz) {
        case DDI_DATA_SZ01_ACC:
                for (b = (uint8_t *)dev_addr;
                    bytecount != 0; bytecount -= 1, b += dev_advcnt)
                        ddi_put8(handle, b, 0);
                break;
        case DDI_DATA_SZ02_ACC:
                for (w = (uint16_t *)dev_addr;
                    bytecount != 0; bytecount -= 2, w += dev_advcnt)
                        ddi_put16(handle, w, 0);
                break;
        case DDI_DATA_SZ04_ACC:
                for (l = (uint32_t *)dev_addr;
                    bytecount != 0; bytecount -= 4, l += dev_advcnt)
                        ddi_put32(handle, l, 0);
                break;
        case DDI_DATA_SZ08_ACC:
                for (ll = (uint64_t *)dev_addr;
                    bytecount != 0; bytecount -= 8, ll += dev_advcnt)
                        ddi_put64(handle, ll, 0x0ll);
                break;
        default:
                return (DDI_FAILURE);
        }
        return (DDI_SUCCESS);
}

int
ddi_device_copy(
        ddi_acc_handle_t src_handle, caddr_t src_addr, ssize_t src_advcnt,
        ddi_acc_handle_t dest_handle, caddr_t dest_addr, ssize_t dest_advcnt,
        size_t bytecount, uint_t dev_datasz)
{
        uint8_t *b_src, *b_dst;
        uint16_t *w_src, *w_dst;
        uint32_t *l_src, *l_dst;
        uint64_t *ll_src, *ll_dst;

        /* check for total byte count is multiple of data transfer size */
        if (bytecount != ((bytecount / dev_datasz) * dev_datasz))
                return (DDI_FAILURE);

        switch (dev_datasz) {
        case DDI_DATA_SZ01_ACC:
                b_src = (uint8_t *)src_addr;
                b_dst = (uint8_t *)dest_addr;

                for (; bytecount != 0; bytecount -= 1) {
                        ddi_put8(dest_handle, b_dst,
                            ddi_get8(src_handle, b_src));
                        b_dst += dest_advcnt;
                        b_src += src_advcnt;
                }
                break;
        case DDI_DATA_SZ02_ACC:
                w_src = (uint16_t *)src_addr;
                w_dst = (uint16_t *)dest_addr;

                for (; bytecount != 0; bytecount -= 2) {
                        ddi_put16(dest_handle, w_dst,
                            ddi_get16(src_handle, w_src));
                        w_dst += dest_advcnt;
                        w_src += src_advcnt;
                }
                break;
        case DDI_DATA_SZ04_ACC:
                l_src = (uint32_t *)src_addr;
                l_dst = (uint32_t *)dest_addr;

                for (; bytecount != 0; bytecount -= 4) {
                        ddi_put32(dest_handle, l_dst,
                            ddi_get32(src_handle, l_src));
                        l_dst += dest_advcnt;
                        l_src += src_advcnt;
                }
                break;
        case DDI_DATA_SZ08_ACC:
                ll_src = (uint64_t *)src_addr;
                ll_dst = (uint64_t *)dest_addr;

                for (; bytecount != 0; bytecount -= 8) {
                        ddi_put64(dest_handle, ll_dst,
                            ddi_get64(src_handle, ll_src));
                        ll_dst += dest_advcnt;
                        ll_src += src_advcnt;
                }
                break;
        default:
                return (DDI_FAILURE);
        }
        return (DDI_SUCCESS);
}

#define swap16(value)  \
        ((((value) & 0xff) << 8) | ((value) >> 8))

#define swap32(value)   \
        (((uint32_t)swap16((uint16_t)((value) & 0xffff)) << 16) | \
        (uint32_t)swap16((uint16_t)((value) >> 16)))

#define swap64(value)   \
        (((uint64_t)swap32((uint32_t)((value) & 0xffffffff)) \
            << 32) | \
        (uint64_t)swap32((uint32_t)((value) >> 32)))

uint16_t
ddi_swap16(uint16_t value)
{
        return (swap16(value));
}

uint32_t
ddi_swap32(uint32_t value)
{
        return (swap32(value));
}

uint64_t
ddi_swap64(uint64_t value)
{
        return (swap64(value));
}

/*
 * Convert a binding name to a driver name.
 * A binding name is the name used to determine the driver for a
 * device - it may be either an alias for the driver or the name
 * of the driver itself.
 */
char *
i_binding_to_drv_name(char *bname)
{
        major_t major_no;

        ASSERT(bname != NULL);

        if ((major_no = ddi_name_to_major(bname)) == -1)
                return (NULL);
        return (ddi_major_to_name(major_no));
}

/*
 * Search for minor name that has specified dev_t and spec_type.
 * If spec_type is zero then any dev_t match works.  Since we
 * are returning a pointer to the minor name string, we require the
 * caller to do the locking.
 */
char *
i_ddi_devtspectype_to_minorname(dev_info_t *dip, dev_t dev, int spec_type)
{
        struct ddi_minor_data   *dmdp;

        /*
         * The did layered driver currently intentionally returns a
         * devinfo ptr for an underlying sd instance based on a did
         * dev_t. In this case it is not an error.
         *
         * The did layered driver is associated with Sun Cluster.
         */
        ASSERT((ddi_driver_major(dip) == getmajor(dev)) ||
            (strcmp(ddi_major_to_name(getmajor(dev)), "did") == 0));

        ASSERT(DEVI_BUSY_OWNED(dip));
        for (dmdp = DEVI(dip)->devi_minor; dmdp; dmdp = dmdp->next) {
                if (((dmdp->type == DDM_MINOR) ||
                    (dmdp->type == DDM_INTERNAL_PATH) ||
                    (dmdp->type == DDM_DEFAULT)) &&
                    (dmdp->ddm_dev == dev) &&
                    ((((spec_type & (S_IFCHR|S_IFBLK))) == 0) ||
                    (dmdp->ddm_spec_type == spec_type)))
                        return (dmdp->ddm_name);
        }

        return (NULL);
}

/*
 * Find the devt and spectype of the specified minor_name.
 * Return DDI_FAILURE if minor_name not found. Since we are
 * returning everything via arguments we can do the locking.
 */
int
i_ddi_minorname_to_devtspectype(dev_info_t *dip, char *minor_name,
        dev_t *devtp, int *spectypep)
{
        int                     circ;
        struct ddi_minor_data   *dmdp;

        /* deal with clone minor nodes */
        if (dip == clone_dip) {
                major_t major;
                /*
                 * Make sure minor_name is a STREAMS driver.
                 * We load the driver but don't attach to any instances.
                 */

                major = ddi_name_to_major(minor_name);
                if (major == DDI_MAJOR_T_NONE)
                        return (DDI_FAILURE);

                if (ddi_hold_driver(major) == NULL)
                        return (DDI_FAILURE);

                if (STREAMSTAB(major) == NULL) {
                        ddi_rele_driver(major);
                        return (DDI_FAILURE);
                }
                ddi_rele_driver(major);

                if (devtp)
                        *devtp = makedevice(clone_major, (minor_t)major);

                if (spectypep)
                        *spectypep = S_IFCHR;

                return (DDI_SUCCESS);
        }

        ndi_devi_enter(dip, &circ);
        for (dmdp = DEVI(dip)->devi_minor; dmdp; dmdp = dmdp->next) {
                if (((dmdp->type != DDM_MINOR) &&
                    (dmdp->type != DDM_INTERNAL_PATH) &&
                    (dmdp->type != DDM_DEFAULT)) ||
                    strcmp(minor_name, dmdp->ddm_name))
                        continue;

                if (devtp)
                        *devtp = dmdp->ddm_dev;

                if (spectypep)
                        *spectypep = dmdp->ddm_spec_type;

                ndi_devi_exit(dip, circ);
                return (DDI_SUCCESS);
        }
        ndi_devi_exit(dip, circ);

        return (DDI_FAILURE);
}

static kmutex_t devid_gen_mutex;
static short    devid_gen_number;

#ifdef DEBUG

static int      devid_register_corrupt = 0;
static int      devid_register_corrupt_major = 0;
static int      devid_register_corrupt_hint = 0;
static int      devid_register_corrupt_hint_major = 0;

static int devid_lyr_debug = 0;

#define DDI_DEBUG_DEVID_DEVTS(msg, ndevs, devs)         \
        if (devid_lyr_debug)                                    \
                ddi_debug_devid_devts(msg, ndevs, devs)

#else

#define DDI_DEBUG_DEVID_DEVTS(msg, ndevs, devs)

#endif /* DEBUG */


#ifdef  DEBUG

static void
ddi_debug_devid_devts(char *msg, int ndevs, dev_t *devs)
{
        int i;

        cmn_err(CE_CONT, "%s:\n", msg);
        for (i = 0; i < ndevs; i++) {
                cmn_err(CE_CONT, "    0x%lx\n", devs[i]);
        }
}

static void
ddi_debug_devid_paths(char *msg, int npaths, char **paths)
{
        int i;

        cmn_err(CE_CONT, "%s:\n", msg);
        for (i = 0; i < npaths; i++) {
                cmn_err(CE_CONT, "    %s\n", paths[i]);
        }
}

static void
ddi_debug_devid_devts_per_path(char *path, int ndevs, dev_t *devs)
{
        int i;

        cmn_err(CE_CONT, "dev_ts per path %s\n", path);
        for (i = 0; i < ndevs; i++) {
                cmn_err(CE_CONT, "    0x%lx\n", devs[i]);
        }
}

#endif  /* DEBUG */

/*
 * Register device id into DDI framework.
 * Must be called when the driver is bound.
 */
static int
i_ddi_devid_register(dev_info_t *dip, ddi_devid_t devid)
{
        impl_devid_t    *i_devid = (impl_devid_t *)devid;
        size_t          driver_len;
        const char      *driver_name;
        char            *devid_str;
        major_t         major;

        if ((dip == NULL) ||
            ((major = ddi_driver_major(dip)) == DDI_MAJOR_T_NONE))
                return (DDI_FAILURE);

        /* verify that the devid is valid */
        if (ddi_devid_valid(devid) != DDI_SUCCESS)
                return (DDI_FAILURE);

        /* Updating driver name hint in devid */
        driver_name = ddi_driver_name(dip);
        driver_len = strlen(driver_name);
        if (driver_len > DEVID_HINT_SIZE) {
                /* Pick up last four characters of driver name */
                driver_name += driver_len - DEVID_HINT_SIZE;
                driver_len = DEVID_HINT_SIZE;
        }
        bzero(i_devid->did_driver, DEVID_HINT_SIZE);
        bcopy(driver_name, i_devid->did_driver, driver_len);

#ifdef DEBUG
        /* Corrupt the devid for testing. */
        if (devid_register_corrupt)
                i_devid->did_id[0] += devid_register_corrupt;
        if (devid_register_corrupt_major &&
            (major == devid_register_corrupt_major))
                i_devid->did_id[0] += 1;
        if (devid_register_corrupt_hint)
                i_devid->did_driver[0] += devid_register_corrupt_hint;
        if (devid_register_corrupt_hint_major &&
            (major == devid_register_corrupt_hint_major))
                i_devid->did_driver[0] += 1;
#endif /* DEBUG */

        /* encode the devid as a string */
        if ((devid_str = ddi_devid_str_encode(devid, NULL)) == NULL)
                return (DDI_FAILURE);

        /* add string as a string property */
        if (ndi_prop_update_string(DDI_DEV_T_NONE, dip,
            DEVID_PROP_NAME, devid_str) != DDI_SUCCESS) {
                cmn_err(CE_WARN, "%s%d: devid property update failed",
                    ddi_driver_name(dip), ddi_get_instance(dip));
                ddi_devid_str_free(devid_str);
                return (DDI_FAILURE);
        }

        /* keep pointer to devid string for interrupt context fma code */
        if (DEVI(dip)->devi_devid_str)
                ddi_devid_str_free(DEVI(dip)->devi_devid_str);
        DEVI(dip)->devi_devid_str = devid_str;
        return (DDI_SUCCESS);
}

int
ddi_devid_register(dev_info_t *dip, ddi_devid_t devid)
{
        int rval;

        rval = i_ddi_devid_register(dip, devid);
        if (rval == DDI_SUCCESS) {
                /*
                 * Register devid in devid-to-path cache
                 */
                if (e_devid_cache_register(dip, devid) == DDI_SUCCESS) {
                        mutex_enter(&DEVI(dip)->devi_lock);
                        DEVI(dip)->devi_flags |= DEVI_CACHED_DEVID;
                        mutex_exit(&DEVI(dip)->devi_lock);
                } else if (ddi_get_name_addr(dip)) {
                        /*
                         * We only expect cache_register DDI_FAILURE when we
                         * can't form the full path because of NULL devi_addr.
                         */
                        cmn_err(CE_WARN, "%s%d: failed to cache devid",
                            ddi_driver_name(dip), ddi_get_instance(dip));
                }
        } else {
                cmn_err(CE_WARN, "%s%d: failed to register devid",
                    ddi_driver_name(dip), ddi_get_instance(dip));
        }
        return (rval);
}

/*
 * Remove (unregister) device id from DDI framework.
 * Must be called when device is detached.
 */
static void
i_ddi_devid_unregister(dev_info_t *dip)
{
        if (DEVI(dip)->devi_devid_str) {
                ddi_devid_str_free(DEVI(dip)->devi_devid_str);
                DEVI(dip)->devi_devid_str = NULL;
        }

        /* remove the devid property */
        (void) ndi_prop_remove(DDI_DEV_T_NONE, dip, DEVID_PROP_NAME);
}

void
ddi_devid_unregister(dev_info_t *dip)
{
        mutex_enter(&DEVI(dip)->devi_lock);
        DEVI(dip)->devi_flags &= ~DEVI_CACHED_DEVID;
        mutex_exit(&DEVI(dip)->devi_lock);
        e_devid_cache_unregister(dip);
        i_ddi_devid_unregister(dip);
}

/*
 * Allocate and initialize a device id.
 */
int
ddi_devid_init(
        dev_info_t      *dip,
        ushort_t        devid_type,
        ushort_t        nbytes,
        void            *id,
        ddi_devid_t     *ret_devid)
{
        impl_devid_t    *i_devid;
        int             sz = sizeof (*i_devid) + nbytes - sizeof (char);
        int             driver_len;
        const char      *driver_name;

        switch (devid_type) {
        case DEVID_SCSI3_WWN:
                /*FALLTHRU*/
        case DEVID_SCSI_SERIAL:
                /*FALLTHRU*/
        case DEVID_ATA_SERIAL:
                /*FALLTHRU*/
        case DEVID_ENCAP:
                if (nbytes == 0)
                        return (DDI_FAILURE);
                if (id == NULL)
                        return (DDI_FAILURE);
                break;
        case DEVID_FAB:
                if (nbytes != 0)
                        return (DDI_FAILURE);
                if (id != NULL)
                        return (DDI_FAILURE);
                nbytes = sizeof (int) +
                    sizeof (struct timeval32) + sizeof (short);
                sz += nbytes;
                break;
        default:
                return (DDI_FAILURE);
        }

        if ((i_devid = kmem_zalloc(sz, KM_SLEEP)) == NULL)
                return (DDI_FAILURE);

        i_devid->did_magic_hi = DEVID_MAGIC_MSB;
        i_devid->did_magic_lo = DEVID_MAGIC_LSB;
        i_devid->did_rev_hi = DEVID_REV_MSB;
        i_devid->did_rev_lo = DEVID_REV_LSB;
        DEVID_FORMTYPE(i_devid, devid_type);
        DEVID_FORMLEN(i_devid, nbytes);

        /* Fill in driver name hint */
        driver_name = ddi_driver_name(dip);
        driver_len = strlen(driver_name);
        if (driver_len > DEVID_HINT_SIZE) {
                /* Pick up last four characters of driver name */
                driver_name += driver_len - DEVID_HINT_SIZE;
                driver_len = DEVID_HINT_SIZE;
        }

        bcopy(driver_name, i_devid->did_driver, driver_len);

        /* Fill in id field */
        if (devid_type == DEVID_FAB) {
                char            *cp;
                uint32_t        hostid;
                struct timeval32 timestamp32;
                int             i;
                int             *ip;
                short           gen;

                /* increase the generation number */
                mutex_enter(&devid_gen_mutex);
                gen = devid_gen_number++;
                mutex_exit(&devid_gen_mutex);

                cp = i_devid->did_id;

                /* Fill in host id (big-endian byte ordering) */
                hostid = zone_get_hostid(NULL);
                *cp++ = hibyte(hiword(hostid));
                *cp++ = lobyte(hiword(hostid));
                *cp++ = hibyte(loword(hostid));
                *cp++ = lobyte(loword(hostid));

                /*
                 * Fill in timestamp (big-endian byte ordering)
                 *
                 * (Note that the format may have to be changed
                 * before 2038 comes around, though it's arguably
                 * unique enough as it is..)
                 */
                uniqtime32(&timestamp32);
                ip = (int *)&timestamp32;
                for (i = 0;
                    i < sizeof (timestamp32) / sizeof (int); i++, ip++) {
                        int     val;
                        val = *ip;
                        *cp++ = hibyte(hiword(val));
                        *cp++ = lobyte(hiword(val));
                        *cp++ = hibyte(loword(val));
                        *cp++ = lobyte(loword(val));
                }

                /* fill in the generation number */
                *cp++ = hibyte(gen);
                *cp++ = lobyte(gen);
        } else
                bcopy(id, i_devid->did_id, nbytes);

        /* return device id */
        *ret_devid = (ddi_devid_t)i_devid;
        return (DDI_SUCCESS);
}

int
ddi_devid_get(dev_info_t *dip, ddi_devid_t *ret_devid)
{
        return (i_ddi_devi_get_devid(DDI_DEV_T_ANY, dip, ret_devid));
}

int
i_ddi_devi_get_devid(dev_t dev, dev_info_t *dip, ddi_devid_t *ret_devid)
{
        char            *devidstr;

        ASSERT(dev != DDI_DEV_T_NONE);

        /* look up the property, devt specific first */
        if (ddi_prop_lookup_string(dev, dip, DDI_PROP_DONTPASS,
            DEVID_PROP_NAME, &devidstr) != DDI_PROP_SUCCESS) {
                if ((dev == DDI_DEV_T_ANY) ||
                    (ddi_prop_lookup_string(DDI_DEV_T_ANY, dip,
                    DDI_PROP_DONTPASS, DEVID_PROP_NAME, &devidstr) !=
                    DDI_PROP_SUCCESS)) {
                        return (DDI_FAILURE);
                }
        }

        /* convert to binary form */
        if (ddi_devid_str_decode(devidstr, ret_devid, NULL) == -1) {
                ddi_prop_free(devidstr);
                return (DDI_FAILURE);
        }
        ddi_prop_free(devidstr);
        return (DDI_SUCCESS);
}

/*
 * Return a copy of the device id for dev_t
 */
int
ddi_lyr_get_devid(dev_t dev, ddi_devid_t *ret_devid)
{
        dev_info_t      *dip;
        int             rval;

        /* get the dip */
        if ((dip = e_ddi_hold_devi_by_dev(dev, 0)) == NULL)
                return (DDI_FAILURE);

        rval = i_ddi_devi_get_devid(dev, dip, ret_devid);

        ddi_release_devi(dip);          /* e_ddi_hold_devi_by_dev() */
        return (rval);
}

/*
 * Return a copy of the minor name for dev_t and spec_type
 */
int
ddi_lyr_get_minor_name(dev_t dev, int spec_type, char **minor_name)
{
        char            *buf;
        int             circ;
        dev_info_t      *dip;
        char            *nm;
        int             rval;

        if ((dip = e_ddi_hold_devi_by_dev(dev, 0)) == NULL) {
                *minor_name = NULL;
                return (DDI_FAILURE);
        }

        /* Find the minor name and copy into max size buf */
        buf = kmem_alloc(MAXNAMELEN, KM_SLEEP);
        ndi_devi_enter(dip, &circ);
        nm = i_ddi_devtspectype_to_minorname(dip, dev, spec_type);
        if (nm)
                (void) strcpy(buf, nm);
        ndi_devi_exit(dip, circ);
        ddi_release_devi(dip);  /* e_ddi_hold_devi_by_dev() */

        if (nm) {
                /* duplicate into min size buf for return result */
                *minor_name = i_ddi_strdup(buf, KM_SLEEP);
                rval = DDI_SUCCESS;
        } else {
                *minor_name = NULL;
                rval = DDI_FAILURE;
        }

        /* free max size buf and return */
        kmem_free(buf, MAXNAMELEN);
        return (rval);
}

int
ddi_lyr_devid_to_devlist(
        ddi_devid_t     devid,
        char            *minor_name,
        int             *retndevs,
        dev_t           **retdevs)
{
        ASSERT(ddi_devid_valid(devid) == DDI_SUCCESS);

        if (e_devid_cache_to_devt_list(devid, minor_name,
            retndevs, retdevs) == DDI_SUCCESS) {
                ASSERT(*retndevs > 0);
                DDI_DEBUG_DEVID_DEVTS("ddi_lyr_devid_to_devlist",
                    *retndevs, *retdevs);
                return (DDI_SUCCESS);
        }

        if (e_ddi_devid_discovery(devid) == DDI_FAILURE) {
                return (DDI_FAILURE);
        }

        if (e_devid_cache_to_devt_list(devid, minor_name,
            retndevs, retdevs) == DDI_SUCCESS) {
                ASSERT(*retndevs > 0);
                DDI_DEBUG_DEVID_DEVTS("ddi_lyr_devid_to_devlist",
                    *retndevs, *retdevs);
                return (DDI_SUCCESS);
        }

        return (DDI_FAILURE);
}

void
ddi_lyr_free_devlist(dev_t *devlist, int ndevs)
{
        kmem_free(devlist, sizeof (dev_t) * ndevs);
}

/*
 * Note: This will need to be fixed if we ever allow processes to
 * have more than one data model per exec.
 */
model_t
ddi_mmap_get_model(void)
{
        return (get_udatamodel());
}

model_t
ddi_model_convert_from(model_t model)
{
        return ((model & DDI_MODEL_MASK) & ~DDI_MODEL_NATIVE);
}

/*
 * ddi interfaces managing storage and retrieval of eventcookies.
 */

/*
 * Invoke bus nexus driver's implementation of the
 * (*bus_remove_eventcall)() interface to remove a registered
 * callback handler for "event".
 */
int
ddi_remove_event_handler(ddi_callback_id_t id)
{
        ndi_event_callbacks_t *cb = (ndi_event_callbacks_t *)id;
        dev_info_t *ddip;

        ASSERT(cb);
        if (!cb) {
                return (DDI_FAILURE);
        }

        ddip = NDI_EVENT_DDIP(cb->ndi_evtcb_cookie);
        return (ndi_busop_remove_eventcall(ddip, id));
}

/*
 * Invoke bus nexus driver's implementation of the
 * (*bus_add_eventcall)() interface to register a callback handler
 * for "event".
 */
int
ddi_add_event_handler(dev_info_t *dip, ddi_eventcookie_t event,
    void (*handler)(dev_info_t *, ddi_eventcookie_t, void *, void *),
    void *arg, ddi_callback_id_t *id)
{
        return (ndi_busop_add_eventcall(dip, dip, event, handler, arg, id));
}


/*
 * Return a handle for event "name" by calling up the device tree
 * hierarchy via  (*bus_get_eventcookie)() interface until claimed
 * by a bus nexus or top of dev_info tree is reached.
 */
int
ddi_get_eventcookie(dev_info_t *dip, char *name,
    ddi_eventcookie_t *event_cookiep)
{
        return (ndi_busop_get_eventcookie(dip, dip,
            name, event_cookiep));
}

/*
 * This procedure is provided as the general callback function when
 * umem_lockmemory calls as_add_callback for long term memory locking.
 * When as_unmap, as_setprot, or as_free encounter segments which have
 * locked memory, this callback will be invoked.
 */
void
umem_lock_undo(struct as *as, void *arg, uint_t event)
{
        _NOTE(ARGUNUSED(as, event))
        struct ddi_umem_cookie *cp = (struct ddi_umem_cookie *)arg;

        /*
         * Call the cleanup function.  Decrement the cookie reference
         * count, if it goes to zero, return the memory for the cookie.
         * The i_ddi_umem_unlock for this cookie may or may not have been
         * called already.  It is the responsibility of the caller of
         * umem_lockmemory to handle the case of the cleanup routine
         * being called after a ddi_umem_unlock for the cookie
         * was called.
         */

        (*cp->callbacks.cbo_umem_lock_cleanup)((ddi_umem_cookie_t)cp);

        /* remove the cookie if reference goes to zero */
        if (atomic_dec_ulong_nv((ulong_t *)(&(cp->cook_refcnt))) == 0) {
                kmem_free(cp, sizeof (struct ddi_umem_cookie));
        }
}

/*
 * The following two Consolidation Private routines provide generic
 * interfaces to increase/decrease the amount of device-locked memory.
 *
 * To keep project_rele and project_hold consistent, i_ddi_decr_locked_memory()
 * must be called every time i_ddi_incr_locked_memory() is called.
 */
int
/* ARGSUSED */
i_ddi_incr_locked_memory(proc_t *procp, rctl_qty_t inc)
{
        ASSERT(procp != NULL);
        mutex_enter(&procp->p_lock);
        if (rctl_incr_locked_mem(procp, NULL, inc, 1)) {
                mutex_exit(&procp->p_lock);
                return (ENOMEM);
        }
        mutex_exit(&procp->p_lock);
        return (0);
}

/*
 * To keep project_rele and project_hold consistent, i_ddi_incr_locked_memory()
 * must be called every time i_ddi_decr_locked_memory() is called.
 */
/* ARGSUSED */
void
i_ddi_decr_locked_memory(proc_t *procp, rctl_qty_t dec)
{
        ASSERT(procp != NULL);
        mutex_enter(&procp->p_lock);
        rctl_decr_locked_mem(procp, NULL, dec, 1);
        mutex_exit(&procp->p_lock);
}

/*
 * The cookie->upd_max_lock_rctl flag is used to determine if we should
 * charge device locked memory to the max-locked-memory rctl.  Tracking
 * device locked memory causes the rctl locks to get hot under high-speed
 * I/O such as RDSv3 over IB.  If there is no max-locked-memory rctl limit,
 * we bypass charging the locked memory to the rctl altogether.  The cookie's
 * flag tells us if the rctl value should be updated when unlocking the memory,
 * in case the rctl gets changed after the memory was locked.  Any device
 * locked memory in that rare case will not be counted toward the rctl limit.
 *
 * When tracking the locked memory, the kproject_t parameter is always NULL
 * in the code paths:
 *      i_ddi_incr_locked_memory -> rctl_incr_locked_mem
 *      i_ddi_decr_locked_memory -> rctl_decr_locked_mem
 * Thus, we always use the tk_proj member to check the projp setting.
 */
static void
init_lockedmem_rctl_flag(struct ddi_umem_cookie *cookie)
{
        proc_t          *p;
        kproject_t      *projp;
        zone_t          *zonep;

        ASSERT(cookie);
        p = cookie->procp;
        ASSERT(p);

        zonep = p->p_zone;
        projp = p->p_task->tk_proj;

        ASSERT(zonep);
        ASSERT(projp);

        if (zonep->zone_locked_mem_ctl == UINT64_MAX &&
            projp->kpj_data.kpd_locked_mem_ctl == UINT64_MAX)
                cookie->upd_max_lock_rctl = 0;
        else
                cookie->upd_max_lock_rctl = 1;
}

/*
 * This routine checks if the max-locked-memory resource ctl is
 * exceeded, if not increments it, grabs a hold on the project.
 * Returns 0 if successful otherwise returns error code
 */
static int
umem_incr_devlockmem(struct ddi_umem_cookie *cookie)
{
        proc_t          *procp;
        int             ret;

        ASSERT(cookie);
        if (cookie->upd_max_lock_rctl == 0)
                return (0);

        procp = cookie->procp;
        ASSERT(procp);

        if ((ret = i_ddi_incr_locked_memory(procp,
            cookie->size)) != 0) {
                return (ret);
        }
        return (0);
}

/*
 * Decrements the max-locked-memory resource ctl and releases
 * the hold on the project that was acquired during umem_incr_devlockmem
 */
static void
umem_decr_devlockmem(struct ddi_umem_cookie *cookie)
{
        proc_t          *proc;

        if (cookie->upd_max_lock_rctl == 0)
                return;

        proc = (proc_t *)cookie->procp;
        if (!proc)
                return;

        i_ddi_decr_locked_memory(proc, cookie->size);
}

/*
 * A consolidation private function which is essentially equivalent to
 * ddi_umem_lock but with the addition of arguments ops_vector and procp.
 * A call to as_add_callback is done if DDI_UMEMLOCK_LONGTERM is set, and
 * the ops_vector is valid.
 *
 * Lock the virtual address range in the current process and create a
 * ddi_umem_cookie (of type UMEM_LOCKED). This can be used to pass to
 * ddi_umem_iosetup to create a buf or do devmap_umem_setup/remap to export
 * to user space.
 *
 * Note: The resource control accounting currently uses a full charge model
 * in other words attempts to lock the same/overlapping areas of memory
 * will deduct the full size of the buffer from the projects running
 * counter for the device locked memory.
 *
 * addr, size should be PAGESIZE aligned
 *
 * flags - DDI_UMEMLOCK_READ, DDI_UMEMLOCK_WRITE or both
 *      identifies whether the locked memory will be read or written or both
 *      DDI_UMEMLOCK_LONGTERM  must be set when the locking will
 * be maintained for an indefinitely long period (essentially permanent),
 * rather than for what would be required for a typical I/O completion.
 * When DDI_UMEMLOCK_LONGTERM is set, umem_lockmemory will return EFAULT
 * if the memory pertains to a regular file which is mapped MAP_SHARED.
 * This is to prevent a deadlock if a file truncation is attempted after
 * after the locking is done.
 *
 * Returns 0 on success
 *      EINVAL - for invalid parameters
 *      EPERM, ENOMEM and other error codes returned by as_pagelock
 *      ENOMEM - is returned if the current request to lock memory exceeds
 *              *.max-locked-memory resource control value.
 *      EFAULT - memory pertains to a regular file mapped shared and
 *              and DDI_UMEMLOCK_LONGTERM flag is set
 *      EAGAIN - could not start the ddi_umem_unlock list processing thread
 */
int
umem_lockmemory(caddr_t addr, size_t len, int flags, ddi_umem_cookie_t *cookie,
                struct umem_callback_ops *ops_vector,
                proc_t *procp)
{
        int     error;
        struct ddi_umem_cookie *p;
        void    (*driver_callback)() = NULL;
        struct as *as;
        struct seg              *seg;
        vnode_t                 *vp;

        /* Allow device drivers to not have to reference "curproc" */
        if (procp == NULL)
                procp = curproc;
        as = procp->p_as;
        *cookie = NULL;         /* in case of any error return */

        /* These are the only three valid flags */
        if ((flags & ~(DDI_UMEMLOCK_READ | DDI_UMEMLOCK_WRITE |
            DDI_UMEMLOCK_LONGTERM)) != 0)
                return (EINVAL);

        /* At least one (can be both) of the two access flags must be set */
        if ((flags & (DDI_UMEMLOCK_READ | DDI_UMEMLOCK_WRITE)) == 0)
                return (EINVAL);

        /* addr and len must be page-aligned */
        if (((uintptr_t)addr & PAGEOFFSET) != 0)
                return (EINVAL);

        if ((len & PAGEOFFSET) != 0)
                return (EINVAL);

        /*
         * For longterm locking a driver callback must be specified; if
         * not longterm then a callback is optional.
         */
        if (ops_vector != NULL) {
                if (ops_vector->cbo_umem_callback_version !=
                    UMEM_CALLBACK_VERSION)
                        return (EINVAL);
                else
                        driver_callback = ops_vector->cbo_umem_lock_cleanup;
        }
        if ((driver_callback == NULL) && (flags & DDI_UMEMLOCK_LONGTERM))
                return (EINVAL);

        /*
         * Call i_ddi_umem_unlock_thread_start if necessary.  It will
         * be called on first ddi_umem_lock or umem_lockmemory call.
         */
        if (ddi_umem_unlock_thread == NULL)
                i_ddi_umem_unlock_thread_start();

        /* Allocate memory for the cookie */
        p = kmem_zalloc(sizeof (struct ddi_umem_cookie), KM_SLEEP);

        /* Convert the flags to seg_rw type */
        if (flags & DDI_UMEMLOCK_WRITE) {
                p->s_flags = S_WRITE;
        } else {
                p->s_flags = S_READ;
        }

        /* Store procp in cookie for later iosetup/unlock */
        p->procp = (void *)procp;

        /*
         * Store the struct as pointer in cookie for later use by
         * ddi_umem_unlock.  The proc->p_as will be stale if ddi_umem_unlock
         * is called after relvm is called.
         */
        p->asp = as;

        /*
         * The size field is needed for lockmem accounting.
         */
        p->size = len;
        init_lockedmem_rctl_flag(p);

        if (umem_incr_devlockmem(p) != 0) {
                /*
                 * The requested memory cannot be locked
                 */
                kmem_free(p, sizeof (struct ddi_umem_cookie));
                *cookie = (ddi_umem_cookie_t)NULL;
                return (ENOMEM);
        }

        /* Lock the pages corresponding to addr, len in memory */
        error = as_pagelock(as, &(p->pparray), addr, len, p->s_flags);
        if (error != 0) {
                umem_decr_devlockmem(p);
                kmem_free(p, sizeof (struct ddi_umem_cookie));
                *cookie = (ddi_umem_cookie_t)NULL;
                return (error);
        }

        /*
         * For longterm locking the addr must pertain to a seg_vn segment or
         * or a seg_spt segment.
         * If the segment pertains to a regular file, it cannot be
         * mapped MAP_SHARED.
         * This is to prevent a deadlock if a file truncation is attempted
         * after the locking is done.
         * Doing this after as_pagelock guarantees persistence of the as; if
         * an unacceptable segment is found, the cleanup includes calling
         * as_pageunlock before returning EFAULT.
         *
         * segdev is allowed here as it is already locked.  This allows
         * for memory exported by drivers through mmap() (which is already
         * locked) to be allowed for LONGTERM.
         */
        if (flags & DDI_UMEMLOCK_LONGTERM) {
                extern  struct seg_ops segspt_shmops;
                extern  struct seg_ops segdev_ops;
                AS_LOCK_ENTER(as, RW_READER);
                for (seg = as_segat(as, addr); ; seg = AS_SEGNEXT(as, seg)) {
                        if (seg == NULL || seg->s_base > addr + len)
                                break;
                        if (seg->s_ops == &segdev_ops)
                                continue;
                        if (((seg->s_ops != &segvn_ops) &&
                            (seg->s_ops != &segspt_shmops)) ||
                            ((SEGOP_GETVP(seg, addr, &vp) == 0 &&
                            vp != NULL && vp->v_type == VREG) &&
                            (SEGOP_GETTYPE(seg, addr) & MAP_SHARED))) {
                                as_pageunlock(as, p->pparray,
                                    addr, len, p->s_flags);
                                AS_LOCK_EXIT(as);
                                umem_decr_devlockmem(p);
                                kmem_free(p, sizeof (struct ddi_umem_cookie));
                                *cookie = (ddi_umem_cookie_t)NULL;
                                return (EFAULT);
                        }
                }
                AS_LOCK_EXIT(as);
        }


        /* Initialize the fields in the ddi_umem_cookie */
        p->cvaddr = addr;
        p->type = UMEM_LOCKED;
        if (driver_callback != NULL) {
                /* i_ddi_umem_unlock and umem_lock_undo may need the cookie */
                p->cook_refcnt = 2;
                p->callbacks = *ops_vector;
        } else {
                /* only i_ddi_umme_unlock needs the cookie */
                p->cook_refcnt = 1;
        }

        *cookie = (ddi_umem_cookie_t)p;

        /*
         * If a driver callback was specified, add an entry to the
         * as struct callback list. The as_pagelock above guarantees
         * the persistence of as.
         */
        if (driver_callback) {
                error = as_add_callback(as, umem_lock_undo, p, AS_ALL_EVENT,
                    addr, len, KM_SLEEP);
                if (error != 0) {
                        as_pageunlock(as, p->pparray,
                            addr, len, p->s_flags);
                        umem_decr_devlockmem(p);
                        kmem_free(p, sizeof (struct ddi_umem_cookie));
                        *cookie = (ddi_umem_cookie_t)NULL;
                }
        }
        return (error);
}

/*
 * Unlock the pages locked by ddi_umem_lock or umem_lockmemory and free
 * the cookie.  Called from i_ddi_umem_unlock_thread.
 */

static void
i_ddi_umem_unlock(struct ddi_umem_cookie *p)
{
        uint_t  rc;

        /*
         * There is no way to determine whether a callback to
         * umem_lock_undo was registered via as_add_callback.
         * (i.e. umem_lockmemory was called with DDI_MEMLOCK_LONGTERM and
         * a valid callback function structure.)  as_delete_callback
         * is called to delete a possible registered callback.  If the
         * return from as_delete_callbacks is AS_CALLBACK_DELETED, it
         * indicates that there was a callback registered, and that is was
         * successfully deleted.  Thus, the cookie reference count
         * will never be decremented by umem_lock_undo.  Just return the
         * memory for the cookie, since both users of the cookie are done.
         * A return of AS_CALLBACK_NOTFOUND indicates a callback was
         * never registered.  A return of AS_CALLBACK_DELETE_DEFERRED
         * indicates that callback processing is taking place and, and
         * umem_lock_undo is, or will be, executing, and thus decrementing
         * the cookie reference count when it is complete.
         *
         * This needs to be done before as_pageunlock so that the
         * persistence of as is guaranteed because of the locked pages.
         *
         */
        rc = as_delete_callback(p->asp, p);


        /*
         * The proc->p_as will be stale if i_ddi_umem_unlock is called
         * after relvm is called so use p->asp.
         */
        as_pageunlock(p->asp, p->pparray, p->cvaddr, p->size, p->s_flags);

        /*
         * Now that we have unlocked the memory decrement the
         * *.max-locked-memory rctl
         */
        umem_decr_devlockmem(p);

        if (rc == AS_CALLBACK_DELETED) {
                /* umem_lock_undo will not happen, return the cookie memory */
                ASSERT(p->cook_refcnt == 2);
                kmem_free(p, sizeof (struct ddi_umem_cookie));
        } else {
                /*
                 * umem_undo_lock may happen if as_delete_callback returned
                 * AS_CALLBACK_DELETE_DEFERRED.  In that case, decrement the
                 * reference count, atomically, and return the cookie
                 * memory if the reference count goes to zero.  The only
                 * other value for rc is AS_CALLBACK_NOTFOUND.  In that
                 * case, just return the cookie memory.
                 */
                if ((rc != AS_CALLBACK_DELETE_DEFERRED) ||
                    (atomic_dec_ulong_nv((ulong_t *)(&(p->cook_refcnt)))
                    == 0)) {
                        kmem_free(p, sizeof (struct ddi_umem_cookie));
                }
        }
}

/*
 * i_ddi_umem_unlock_thread - deferred ddi_umem_unlock list handler.
 *
 * Call i_ddi_umem_unlock for entries in the ddi_umem_unlock list
 * until it is empty.  Then, wait for more to be added.  This thread is awoken
 * via calls to ddi_umem_unlock.
 */

static void
i_ddi_umem_unlock_thread(void)
{
        struct ddi_umem_cookie  *ret_cookie;
        callb_cpr_t     cprinfo;

        /* process the ddi_umem_unlock list */
        CALLB_CPR_INIT(&cprinfo, &ddi_umem_unlock_mutex,
            callb_generic_cpr, "unlock_thread");
        for (;;) {
                mutex_enter(&ddi_umem_unlock_mutex);
                if (ddi_umem_unlock_head != NULL) {     /* list not empty */
                        ret_cookie = ddi_umem_unlock_head;
                        /* take if off the list */
                        if ((ddi_umem_unlock_head =
                            ddi_umem_unlock_head->unl_forw) == NULL) {
                                ddi_umem_unlock_tail = NULL;
                        }
                        mutex_exit(&ddi_umem_unlock_mutex);
                        /* unlock the pages in this cookie */
                        (void) i_ddi_umem_unlock(ret_cookie);
                } else {   /* list is empty, wait for next ddi_umem_unlock */
                        CALLB_CPR_SAFE_BEGIN(&cprinfo);
                        cv_wait(&ddi_umem_unlock_cv, &ddi_umem_unlock_mutex);
                        CALLB_CPR_SAFE_END(&cprinfo, &ddi_umem_unlock_mutex);
                        mutex_exit(&ddi_umem_unlock_mutex);
                }
        }
        /* ddi_umem_unlock_thread does not exit */
        /* NOTREACHED */
}

/*
 * Start the thread that will process the ddi_umem_unlock list if it is
 * not already started (i_ddi_umem_unlock_thread).
 */
static void
i_ddi_umem_unlock_thread_start(void)
{
        mutex_enter(&ddi_umem_unlock_mutex);
        if (ddi_umem_unlock_thread == NULL) {
                ddi_umem_unlock_thread = thread_create(NULL, 0,
                    i_ddi_umem_unlock_thread, NULL, 0, &p0,
                    TS_RUN, minclsyspri);
        }
        mutex_exit(&ddi_umem_unlock_mutex);
}

/*
 * Lock the virtual address range in the current process and create a
 * ddi_umem_cookie (of type UMEM_LOCKED). This can be used to pass to
 * ddi_umem_iosetup to create a buf or do devmap_umem_setup/remap to export
 * to user space.
 *
 * Note: The resource control accounting currently uses a full charge model
 * in other words attempts to lock the same/overlapping areas of memory
 * will deduct the full size of the buffer from the projects running
 * counter for the device locked memory. This applies to umem_lockmemory too.
 *
 * addr, size should be PAGESIZE aligned
 * flags - DDI_UMEMLOCK_READ, DDI_UMEMLOCK_WRITE or both
 *      identifies whether the locked memory will be read or written or both
 *
 * Returns 0 on success
 *      EINVAL - for invalid parameters
 *      EPERM, ENOMEM and other error codes returned by as_pagelock
 *      ENOMEM - is returned if the current request to lock memory exceeds
 *              *.max-locked-memory resource control value.
 *      EAGAIN - could not start the ddi_umem_unlock list processing thread
 */
int
ddi_umem_lock(caddr_t addr, size_t len, int flags, ddi_umem_cookie_t *cookie)
{
        int     error;
        struct ddi_umem_cookie *p;

        *cookie = NULL;         /* in case of any error return */

        /* These are the only two valid flags */
        if ((flags & ~(DDI_UMEMLOCK_READ | DDI_UMEMLOCK_WRITE)) != 0) {
                return (EINVAL);
        }

        /* At least one of the two flags (or both) must be set */
        if ((flags & (DDI_UMEMLOCK_READ | DDI_UMEMLOCK_WRITE)) == 0) {
                return (EINVAL);
        }

        /* addr and len must be page-aligned */
        if (((uintptr_t)addr & PAGEOFFSET) != 0) {
                return (EINVAL);
        }

        if ((len & PAGEOFFSET) != 0) {
                return (EINVAL);
        }

        /*
         * Call i_ddi_umem_unlock_thread_start if necessary.  It will
         * be called on first ddi_umem_lock or umem_lockmemory call.
         */
        if (ddi_umem_unlock_thread == NULL)
                i_ddi_umem_unlock_thread_start();

        /* Allocate memory for the cookie */
        p = kmem_zalloc(sizeof (struct ddi_umem_cookie), KM_SLEEP);

        /* Convert the flags to seg_rw type */
        if (flags & DDI_UMEMLOCK_WRITE) {
                p->s_flags = S_WRITE;
        } else {
                p->s_flags = S_READ;
        }

        /* Store curproc in cookie for later iosetup/unlock */
        p->procp = (void *)curproc;

        /*
         * Store the struct as pointer in cookie for later use by
         * ddi_umem_unlock.  The proc->p_as will be stale if ddi_umem_unlock
         * is called after relvm is called.
         */
        p->asp = curproc->p_as;
        /*
         * The size field is needed for lockmem accounting.
         */
        p->size = len;
        init_lockedmem_rctl_flag(p);

        if (umem_incr_devlockmem(p) != 0) {
                /*
                 * The requested memory cannot be locked
                 */
                kmem_free(p, sizeof (struct ddi_umem_cookie));
                *cookie = (ddi_umem_cookie_t)NULL;
                return (ENOMEM);
        }

        /* Lock the pages corresponding to addr, len in memory */
        error = as_pagelock(((proc_t *)p->procp)->p_as, &(p->pparray),
            addr, len, p->s_flags);
        if (error != 0) {
                umem_decr_devlockmem(p);
                kmem_free(p, sizeof (struct ddi_umem_cookie));
                *cookie = (ddi_umem_cookie_t)NULL;
                return (error);
        }

        /* Initialize the fields in the ddi_umem_cookie */
        p->cvaddr = addr;
        p->type = UMEM_LOCKED;
        p->cook_refcnt = 1;

        *cookie = (ddi_umem_cookie_t)p;
        return (error);
}

/*
 * Add the cookie to the ddi_umem_unlock list.  Pages will be
 * unlocked by i_ddi_umem_unlock_thread.
 */

void
ddi_umem_unlock(ddi_umem_cookie_t cookie)
{
        struct ddi_umem_cookie  *p = (struct ddi_umem_cookie *)cookie;

        ASSERT(p->type == UMEM_LOCKED);
        ASSERT(CPU_ON_INTR(CPU) == 0); /* cannot be high level */
        ASSERT(ddi_umem_unlock_thread != NULL);

        p->unl_forw = (struct ddi_umem_cookie *)NULL;   /* end of list */
        /*
         * Queue the unlock request and notify i_ddi_umem_unlock thread
         * if it's called in the interrupt context. Otherwise, unlock pages
         * immediately.
         */
        if (servicing_interrupt()) {
                /* queue the unlock request and notify the thread */
                mutex_enter(&ddi_umem_unlock_mutex);
                if (ddi_umem_unlock_head == NULL) {
                        ddi_umem_unlock_head = ddi_umem_unlock_tail = p;
                        cv_broadcast(&ddi_umem_unlock_cv);
                } else {
                        ddi_umem_unlock_tail->unl_forw = p;
                        ddi_umem_unlock_tail = p;
                }
                mutex_exit(&ddi_umem_unlock_mutex);
        } else {
                /* unlock the pages right away */
                (void) i_ddi_umem_unlock(p);
        }
}

/*
 * Create a buf structure from a ddi_umem_cookie
 * cookie - is a ddi_umem_cookie for from ddi_umem_lock and ddi_umem_alloc
 *              (only UMEM_LOCKED & KMEM_NON_PAGEABLE types supported)
 * off, len - identifies the portion of the memory represented by the cookie
 *              that the buf points to.
 *      NOTE: off, len need to follow the alignment/size restrictions of the
 *              device (dev) that this buf will be passed to. Some devices
 *              will accept unrestricted alignment/size, whereas others (such as
 *              st) require some block-size alignment/size. It is the caller's
 *              responsibility to ensure that the alignment/size restrictions
 *              are met (we cannot assert as we do not know the restrictions)
 *
 * direction - is one of B_READ or B_WRITE and needs to be compatible with
 *              the flags used in ddi_umem_lock
 *
 * The following three arguments are used to initialize fields in the
 * buf structure and are uninterpreted by this routine.
 *
 * dev
 * blkno
 * iodone
 *
 * sleepflag - is one of DDI_UMEM_SLEEP or DDI_UMEM_NOSLEEP
 *
 * Returns a buf structure pointer on success (to be freed by freerbuf)
 *      NULL on any parameter error or memory alloc failure
 *
 */
struct buf *
ddi_umem_iosetup(ddi_umem_cookie_t cookie, off_t off, size_t len,
        int direction, dev_t dev, daddr_t blkno,
        int (*iodone)(struct buf *), int sleepflag)
{
        struct ddi_umem_cookie *p = (struct ddi_umem_cookie *)cookie;
        struct buf *bp;

        /*
         * check for valid cookie offset, len
         */
        if ((off + len) > p->size) {
                return (NULL);
        }

        if (len > p->size) {
                return (NULL);
        }

        /* direction has to be one of B_READ or B_WRITE */
        if ((direction != B_READ) && (direction != B_WRITE)) {
                return (NULL);
        }

        /* These are the only two valid sleepflags */
        if ((sleepflag != DDI_UMEM_SLEEP) && (sleepflag != DDI_UMEM_NOSLEEP)) {
                return (NULL);
        }

        /*
         * Only cookies of type UMEM_LOCKED and KMEM_NON_PAGEABLE are supported
         */
        if ((p->type != UMEM_LOCKED) && (p->type != KMEM_NON_PAGEABLE)) {
                return (NULL);
        }

        /* If type is KMEM_NON_PAGEABLE procp is NULL */
        ASSERT((p->type == KMEM_NON_PAGEABLE) ?
            (p->procp == NULL) : (p->procp != NULL));

        bp = kmem_alloc(sizeof (struct buf), sleepflag);
        if (bp == NULL) {
                return (NULL);
        }
        bioinit(bp);

        bp->b_flags = B_BUSY | B_PHYS | direction;
        bp->b_edev = dev;
        bp->b_lblkno = blkno;
        bp->b_iodone = iodone;
        bp->b_bcount = len;
        bp->b_proc = (proc_t *)p->procp;
        ASSERT(((uintptr_t)(p->cvaddr) & PAGEOFFSET) == 0);
        bp->b_un.b_addr = (caddr_t)((uintptr_t)(p->cvaddr) + off);
        if (p->pparray != NULL) {
                bp->b_flags |= B_SHADOW;
                ASSERT(((uintptr_t)(p->cvaddr) & PAGEOFFSET) == 0);
                bp->b_shadow = p->pparray + btop(off);
        }
        return (bp);
}

/*
 * Fault-handling and related routines
 */

ddi_devstate_t
ddi_get_devstate(dev_info_t *dip)
{
        if (DEVI_IS_DEVICE_OFFLINE(dip))
                return (DDI_DEVSTATE_OFFLINE);
        else if (DEVI_IS_DEVICE_DOWN(dip) || DEVI_IS_BUS_DOWN(dip))
                return (DDI_DEVSTATE_DOWN);
        else if (DEVI_IS_BUS_QUIESCED(dip))
                return (DDI_DEVSTATE_QUIESCED);
        else if (DEVI_IS_DEVICE_DEGRADED(dip))
                return (DDI_DEVSTATE_DEGRADED);
        else
                return (DDI_DEVSTATE_UP);
}

void
ddi_dev_report_fault(dev_info_t *dip, ddi_fault_impact_t impact,
        ddi_fault_location_t location, const char *message)
{
        struct ddi_fault_event_data fd;
        ddi_eventcookie_t ec;

        /*
         * Assemble all the information into a fault-event-data structure
         */
        fd.f_dip = dip;
        fd.f_impact = impact;
        fd.f_location = location;
        fd.f_message = message;
        fd.f_oldstate = ddi_get_devstate(dip);

        /*
         * Get eventcookie from defining parent.
         */
        if (ddi_get_eventcookie(dip, DDI_DEVI_FAULT_EVENT, &ec) !=
            DDI_SUCCESS)
                return;

        (void) ndi_post_event(dip, dip, ec, &fd);
}

char *
i_ddi_devi_class(dev_info_t *dip)
{
        return (DEVI(dip)->devi_device_class);
}

int
i_ddi_set_devi_class(dev_info_t *dip, char *devi_class, int flag)
{
        struct dev_info *devi = DEVI(dip);

        mutex_enter(&devi->devi_lock);

        if (devi->devi_device_class)
                kmem_free(devi->devi_device_class,
                    strlen(devi->devi_device_class) + 1);

        if ((devi->devi_device_class = i_ddi_strdup(devi_class, flag))
            != NULL) {
                mutex_exit(&devi->devi_lock);
                return (DDI_SUCCESS);
        }

        mutex_exit(&devi->devi_lock);

        return (DDI_FAILURE);
}


/*
 * Task Queues DDI interfaces.
 */

/* ARGSUSED */
ddi_taskq_t *
ddi_taskq_create(dev_info_t *dip, const char *name, int nthreads,
    pri_t pri, uint_t cflags)
{
        char full_name[TASKQ_NAMELEN];
        const char *tq_name;
        int nodeid = 0;

        if (dip == NULL)
                tq_name = name;
        else {
                nodeid = ddi_get_instance(dip);

                if (name == NULL)
                        name = "tq";

                (void) snprintf(full_name, sizeof (full_name), "%s_%s",
                    ddi_driver_name(dip), name);

                tq_name = full_name;
        }

        return ((ddi_taskq_t *)taskq_create_instance(tq_name, nodeid, nthreads,
            pri == TASKQ_DEFAULTPRI ? minclsyspri : pri,
            nthreads, INT_MAX, TASKQ_PREPOPULATE));
}

void
ddi_taskq_destroy(ddi_taskq_t *tq)
{
        taskq_destroy((taskq_t *)tq);
}

int
ddi_taskq_dispatch(ddi_taskq_t *tq, void (* func)(void *),
    void *arg, uint_t dflags)
{
        taskqid_t id = taskq_dispatch((taskq_t *)tq, func, arg,
            dflags == DDI_SLEEP ? TQ_SLEEP : TQ_NOSLEEP);

        return (id != 0 ? DDI_SUCCESS : DDI_FAILURE);
}

void
ddi_taskq_wait(ddi_taskq_t *tq)
{
        taskq_wait((taskq_t *)tq);
}

void
ddi_taskq_suspend(ddi_taskq_t *tq)
{
        taskq_suspend((taskq_t *)tq);
}

boolean_t
ddi_taskq_suspended(ddi_taskq_t *tq)
{
        return (taskq_suspended((taskq_t *)tq));
}

void
ddi_taskq_resume(ddi_taskq_t *tq)
{
        taskq_resume((taskq_t *)tq);
}

int
ddi_parse(
        const char      *ifname,
        char            *alnum,
        uint_t          *nump)
{
        const char      *p;
        int             l;
        ulong_t         num;
        boolean_t       nonum = B_TRUE;
        char            c;

        l = strlen(ifname);
        for (p = ifname + l; p != ifname; l--) {
                c = *--p;
                if (!isdigit(c)) {
                        (void) strlcpy(alnum, ifname, l + 1);
                        if (ddi_strtoul(p + 1, NULL, 10, &num) != 0)
                                return (DDI_FAILURE);
                        break;
                }
                nonum = B_FALSE;
        }
        if (l == 0 || nonum)
                return (DDI_FAILURE);

        *nump = num;
        return (DDI_SUCCESS);
}

/*
 * Default initialization function for drivers that don't need to quiesce.
 */
/* ARGSUSED */
int
ddi_quiesce_not_needed(dev_info_t *dip)
{
        return (DDI_SUCCESS);
}

/*
 * Initialization function for drivers that should implement quiesce()
 * but haven't yet.
 */
/* ARGSUSED */
int
ddi_quiesce_not_supported(dev_info_t *dip)
{
        return (DDI_FAILURE);
}

char *
ddi_strdup(const char *str, int flag)
{
        int     n;
        char    *ptr;

        ASSERT(str != NULL);
        ASSERT((flag == KM_SLEEP) || (flag == KM_NOSLEEP));

        n = strlen(str);
        if ((ptr = kmem_alloc(n + 1, flag)) == NULL)
                return (NULL);
        bcopy(str, ptr, n + 1);
        return (ptr);
}

char *
strdup(const char *str)
{
        return (ddi_strdup(str, KM_SLEEP));
}

void
strfree(char *str)
{
        ASSERT(str != NULL);
        kmem_free(str, strlen(str) + 1);
}

/*
 * Generic DDI callback interfaces.
 */

int
ddi_cb_register(dev_info_t *dip, ddi_cb_flags_t flags, ddi_cb_func_t cbfunc,
    void *arg1, void *arg2, ddi_cb_handle_t *ret_hdlp)
{
        ddi_cb_t        *cbp;

        ASSERT(dip != NULL);
        ASSERT(DDI_CB_FLAG_VALID(flags));
        ASSERT(cbfunc != NULL);
        ASSERT(ret_hdlp != NULL);

        /* Sanity check the context */
        ASSERT(!servicing_interrupt());
        if (servicing_interrupt())
                return (DDI_FAILURE);

        /* Validate parameters */
        if ((dip == NULL) || !DDI_CB_FLAG_VALID(flags) ||
            (cbfunc == NULL) || (ret_hdlp == NULL))
                return (DDI_EINVAL);

        /* Check for previous registration */
        if (DEVI(dip)->devi_cb_p != NULL)
                return (DDI_EALREADY);

        /* Allocate and initialize callback */
        cbp = kmem_zalloc(sizeof (ddi_cb_t), KM_SLEEP);
        cbp->cb_dip = dip;
        cbp->cb_func = cbfunc;
        cbp->cb_arg1 = arg1;
        cbp->cb_arg2 = arg2;
        cbp->cb_flags = flags;
        DEVI(dip)->devi_cb_p = cbp;

        /* If adding an IRM callback, notify IRM */
        if (flags & DDI_CB_FLAG_INTR)
                i_ddi_irm_set_cb(dip, B_TRUE);

        *ret_hdlp = (ddi_cb_handle_t)&(DEVI(dip)->devi_cb_p);
        return (DDI_SUCCESS);
}

int
ddi_cb_unregister(ddi_cb_handle_t hdl)
{
        ddi_cb_t        *cbp;
        dev_info_t      *dip;

        ASSERT(hdl != NULL);

        /* Sanity check the context */
        ASSERT(!servicing_interrupt());
        if (servicing_interrupt())
                return (DDI_FAILURE);

        /* Validate parameters */
        if ((hdl == NULL) || ((cbp = *(ddi_cb_t **)hdl) == NULL) ||
            ((dip = cbp->cb_dip) == NULL))
                return (DDI_EINVAL);

        /* If removing an IRM callback, notify IRM */
        if (cbp->cb_flags & DDI_CB_FLAG_INTR)
                i_ddi_irm_set_cb(dip, B_FALSE);

        /* Destroy the callback */
        kmem_free(cbp, sizeof (ddi_cb_t));
        DEVI(dip)->devi_cb_p = NULL;

        return (DDI_SUCCESS);
}

/*
 * Platform independent DR routines
 */

static int
ndi2errno(int n)
{
        int err = 0;

        switch (n) {
                case NDI_NOMEM:
                        err = ENOMEM;
                        break;
                case NDI_BUSY:
                        err = EBUSY;
                        break;
                case NDI_FAULT:
                        err = EFAULT;
                        break;
                case NDI_FAILURE:
                        err = EIO;
                        break;
                case NDI_SUCCESS:
                        break;
                case NDI_BADHANDLE:
                default:
                        err = EINVAL;
                        break;
        }
        return (err);
}

/*
 * Prom tree node list
 */
struct ptnode {
        pnode_t         nodeid;
        struct ptnode   *next;
};

/*
 * Prom tree walk arg
 */
struct pta {
        dev_info_t      *pdip;
        devi_branch_t   *bp;
        uint_t          flags;
        dev_info_t      *fdip;
        struct ptnode   *head;
};

static void
visit_node(pnode_t nodeid, struct pta *ap)
{
        struct ptnode   **nextp;
        int             (*select)(pnode_t, void *, uint_t);

        ASSERT(nodeid != OBP_NONODE && nodeid != OBP_BADNODE);

        select = ap->bp->create.prom_branch_select;

        ASSERT(select);

        if (select(nodeid, ap->bp->arg, 0) == DDI_SUCCESS) {

                for (nextp = &ap->head; *nextp; nextp = &(*nextp)->next)
                        ;

                *nextp = kmem_zalloc(sizeof (struct ptnode), KM_SLEEP);

                (*nextp)->nodeid = nodeid;
        }

        if ((ap->flags & DEVI_BRANCH_CHILD) == DEVI_BRANCH_CHILD)
                return;

        nodeid = prom_childnode(nodeid);
        while (nodeid != OBP_NONODE && nodeid != OBP_BADNODE) {
                visit_node(nodeid, ap);
                nodeid = prom_nextnode(nodeid);
        }
}

/*
 * NOTE: The caller of this function must check for device contracts
 * or LDI callbacks against this dip before setting the dip offline.
 */
static int
set_infant_dip_offline(dev_info_t *dip, void *arg)
{
        char    *path = (char *)arg;

        ASSERT(dip);
        ASSERT(arg);

        if (i_ddi_node_state(dip) >= DS_ATTACHED) {
                (void) ddi_pathname(dip, path);
                cmn_err(CE_WARN, "Attempt to set offline flag on attached "
                    "node: %s", path);
                return (DDI_FAILURE);
        }

        mutex_enter(&(DEVI(dip)->devi_lock));
        if (!DEVI_IS_DEVICE_OFFLINE(dip))
                DEVI_SET_DEVICE_OFFLINE(dip);
        mutex_exit(&(DEVI(dip)->devi_lock));

        return (DDI_SUCCESS);
}

typedef struct result {
        char    *path;
        int     result;
} result_t;

static int
dip_set_offline(dev_info_t *dip, void *arg)
{
        int end;
        result_t *resp = (result_t *)arg;

        ASSERT(dip);
        ASSERT(resp);

        /*
         * We stop the walk if e_ddi_offline_notify() returns
         * failure, because this implies that one or more consumers
         * (either LDI or contract based) has blocked the offline.
         * So there is no point in conitnuing the walk
         */
        if (e_ddi_offline_notify(dip) == DDI_FAILURE) {
                resp->result = DDI_FAILURE;
                return (DDI_WALK_TERMINATE);
        }

        /*
         * If set_infant_dip_offline() returns failure, it implies
         * that we failed to set a particular dip offline. This
         * does not imply that the offline as a whole should fail.
         * We want to do the best we can, so we continue the walk.
         */
        if (set_infant_dip_offline(dip, resp->path) == DDI_SUCCESS)
                end = DDI_SUCCESS;
        else
                end = DDI_FAILURE;

        e_ddi_offline_finalize(dip, end);

        return (DDI_WALK_CONTINUE);
}

/*
 * The call to e_ddi_offline_notify() exists for the
 * unlikely error case that a branch we are trying to
 * create already exists and has device contracts or LDI
 * event callbacks against it.
 *
 * We allow create to succeed for such branches only if
 * no constraints block the offline.
 */
static int
branch_set_offline(dev_info_t *dip, char *path)
{
        int             circ;
        int             end;
        result_t        res;


        if (e_ddi_offline_notify(dip) == DDI_FAILURE) {
                return (DDI_FAILURE);
        }

        if (set_infant_dip_offline(dip, path) == DDI_SUCCESS)
                end = DDI_SUCCESS;
        else
                end = DDI_FAILURE;

        e_ddi_offline_finalize(dip, end);

        if (end == DDI_FAILURE)
                return (DDI_FAILURE);

        res.result = DDI_SUCCESS;
        res.path = path;

        ndi_devi_enter(dip, &circ);
        ddi_walk_devs(ddi_get_child(dip), dip_set_offline, &res);
        ndi_devi_exit(dip, circ);

        return (res.result);
}

/*ARGSUSED*/
static int
create_prom_branch(void *arg, int has_changed)
{
        int             circ;
        int             exists, rv;
        pnode_t         nodeid;
        struct ptnode   *tnp;
        dev_info_t      *dip;
        struct pta      *ap = arg;
        devi_branch_t   *bp;
        char            *path;

        ASSERT(ap);
        ASSERT(ap->fdip == NULL);
        ASSERT(ap->pdip && ndi_dev_is_prom_node(ap->pdip));

        bp = ap->bp;

        nodeid = ddi_get_nodeid(ap->pdip);
        if (nodeid == OBP_NONODE || nodeid == OBP_BADNODE) {
                cmn_err(CE_WARN, "create_prom_branch: invalid "
                    "nodeid: 0x%x", nodeid);
                return (EINVAL);
        }

        ap->head = NULL;

        nodeid = prom_childnode(nodeid);
        while (nodeid != OBP_NONODE && nodeid != OBP_BADNODE) {
                visit_node(nodeid, ap);
                nodeid = prom_nextnode(nodeid);
        }

        if (ap->head == NULL)
                return (ENODEV);

        path = kmem_alloc(MAXPATHLEN, KM_SLEEP);
        rv = 0;
        while ((tnp = ap->head) != NULL) {
                ap->head = tnp->next;

                ndi_devi_enter(ap->pdip, &circ);

                /*
                 * Check if the branch already exists.
                 */
                exists = 0;
                dip = e_ddi_nodeid_to_dip(tnp->nodeid);
                if (dip != NULL) {
                        exists = 1;

                        /* Parent is held busy, so release hold */
                        ndi_rele_devi(dip);
#ifdef  DEBUG
                        cmn_err(CE_WARN, "create_prom_branch: dip(%p) exists"
                            " for nodeid 0x%x", (void *)dip, tnp->nodeid);
#endif
                } else {
                        dip = i_ddi_create_branch(ap->pdip, tnp->nodeid);
                }

                kmem_free(tnp, sizeof (struct ptnode));

                /*
                 * Hold the branch if it is not already held
                 */
                if (dip && !exists) {
                        e_ddi_branch_hold(dip);
                }

                ASSERT(dip == NULL || e_ddi_branch_held(dip));

                /*
                 * Set all dips in the newly created branch offline so that
                 * only a "configure" operation can attach
                 * the branch
                 */
                if (dip == NULL || branch_set_offline(dip, path)
                    == DDI_FAILURE) {
                        ndi_devi_exit(ap->pdip, circ);
                        rv = EIO;
                        continue;
                }

                ASSERT(ddi_get_parent(dip) == ap->pdip);

                ndi_devi_exit(ap->pdip, circ);

                if (ap->flags & DEVI_BRANCH_CONFIGURE) {
                        int error = e_ddi_branch_configure(dip, &ap->fdip, 0);
                        if (error && rv == 0)
                                rv = error;
                }

                /*
                 * Invoke devi_branch_callback() (if it exists) only for
                 * newly created branches
                 */
                if (bp->devi_branch_callback && !exists)
                        bp->devi_branch_callback(dip, bp->arg, 0);
        }

        kmem_free(path, MAXPATHLEN);

        return (rv);
}

static int
sid_node_create(dev_info_t *pdip, devi_branch_t *bp, dev_info_t **rdipp)
{
        int                     rv, circ, len;
        int                     i, flags, ret;
        dev_info_t              *dip;
        char                    *nbuf;
        char                    *path;
        static const char       *noname = "<none>";

        ASSERT(pdip);
        ASSERT(DEVI_BUSY_OWNED(pdip));

        flags = 0;

        /*
         * Creating the root of a branch ?
         */
        if (rdipp) {
                *rdipp = NULL;
                flags = DEVI_BRANCH_ROOT;
        }

        ndi_devi_alloc_sleep(pdip, (char *)noname, DEVI_SID_NODEID, &dip);
        rv = bp->create.sid_branch_create(dip, bp->arg, flags);

        nbuf = kmem_alloc(OBP_MAXDRVNAME, KM_SLEEP);

        if (rv == DDI_WALK_ERROR) {
                cmn_err(CE_WARN, "e_ddi_branch_create: Error setting"
                    " properties on devinfo node %p",  (void *)dip);
                goto fail;
        }

        len = OBP_MAXDRVNAME;
        if (ddi_getlongprop_buf(DDI_DEV_T_ANY, dip,
            DDI_PROP_DONTPASS | DDI_PROP_NOTPROM, "name", nbuf, &len)
            != DDI_PROP_SUCCESS) {
                cmn_err(CE_WARN, "e_ddi_branch_create: devinfo node %p has"
                    "no name property", (void *)dip);
                goto fail;
        }

        ASSERT(i_ddi_node_state(dip) == DS_PROTO);
        if (ndi_devi_set_nodename(dip, nbuf, 0) != NDI_SUCCESS) {
                cmn_err(CE_WARN, "e_ddi_branch_create: cannot set name (%s)"
                    " for devinfo node %p", nbuf, (void *)dip);
                goto fail;
        }

        kmem_free(nbuf, OBP_MAXDRVNAME);

        /*
         * Ignore bind failures just like boot does
         */
        (void) ndi_devi_bind_driver(dip, 0);

        switch (rv) {
        case DDI_WALK_CONTINUE:
        case DDI_WALK_PRUNESIB:
                ndi_devi_enter(dip, &circ);

                i = DDI_WALK_CONTINUE;
                for (; i == DDI_WALK_CONTINUE; ) {
                        i = sid_node_create(dip, bp, NULL);
                }

                ASSERT(i == DDI_WALK_ERROR || i == DDI_WALK_PRUNESIB);
                if (i == DDI_WALK_ERROR)
                        rv = i;
                /*
                 * If PRUNESIB stop creating siblings
                 * of dip's child. Subsequent walk behavior
                 * is determined by rv returned by dip.
                 */

                ndi_devi_exit(dip, circ);
                break;
        case DDI_WALK_TERMINATE:
                /*
                 * Don't create children and ask our parent
                 * to not create siblings either.
                 */
                rv = DDI_WALK_PRUNESIB;
                break;
        case DDI_WALK_PRUNECHILD:
                /*
                 * Don't create children, but ask parent to continue
                 * with siblings.
                 */
                rv = DDI_WALK_CONTINUE;
                break;
        default:
                ASSERT(0);
                break;
        }

        if (rdipp)
                *rdipp = dip;

        /*
         * Set device offline - only the "configure" op should cause an attach.
         * Note that it is safe to set the dip offline without checking
         * for either device contract or layered driver (LDI) based constraints
         * since there cannot be any contracts or LDI opens of this device.
         * This is because this node is a newly created dip with the parent busy
         * held, so no other thread can come in and attach this dip. A dip that
         * has never been attached cannot have contracts since by definition
         * a device contract (an agreement between a process and a device minor
         * node) can only be created against a device that has minor nodes
         * i.e is attached. Similarly an LDI open will only succeed if the
         * dip is attached. We assert below that the dip is not attached.
         */
        ASSERT(i_ddi_node_state(dip) < DS_ATTACHED);
        path = kmem_alloc(MAXPATHLEN, KM_SLEEP);
        ret = set_infant_dip_offline(dip, path);
        ASSERT(ret == DDI_SUCCESS);
        kmem_free(path, MAXPATHLEN);

        return (rv);
fail:
        (void) ndi_devi_free(dip);
        kmem_free(nbuf, OBP_MAXDRVNAME);
        return (DDI_WALK_ERROR);
}

static int
create_sid_branch(
        dev_info_t      *pdip,
        devi_branch_t   *bp,
        dev_info_t      **dipp,
        uint_t          flags)
{
        int             rv = 0, state = DDI_WALK_CONTINUE;
        dev_info_t      *rdip;

        while (state == DDI_WALK_CONTINUE) {
                int     circ;

                ndi_devi_enter(pdip, &circ);

                state = sid_node_create(pdip, bp, &rdip);
                if (rdip == NULL) {
                        ndi_devi_exit(pdip, circ);
                        ASSERT(state == DDI_WALK_ERROR);
                        break;
                }

                e_ddi_branch_hold(rdip);

                ndi_devi_exit(pdip, circ);

                if (flags & DEVI_BRANCH_CONFIGURE) {
                        int error = e_ddi_branch_configure(rdip, dipp, 0);
                        if (error && rv == 0)
                                rv = error;
                }

                /*
                 * devi_branch_callback() is optional
                 */
                if (bp->devi_branch_callback)
                        bp->devi_branch_callback(rdip, bp->arg, 0);
        }

        ASSERT(state == DDI_WALK_ERROR || state == DDI_WALK_PRUNESIB);

        return (state == DDI_WALK_ERROR ? EIO : rv);
}

int
e_ddi_branch_create(
        dev_info_t      *pdip,
        devi_branch_t   *bp,
        dev_info_t      **dipp,
        uint_t          flags)
{
        int prom_devi, sid_devi, error;

        if (pdip == NULL || bp == NULL || bp->type == 0)
                return (EINVAL);

        prom_devi = (bp->type == DEVI_BRANCH_PROM) ? 1 : 0;
        sid_devi = (bp->type == DEVI_BRANCH_SID) ? 1 : 0;

        if (prom_devi && bp->create.prom_branch_select == NULL)
                return (EINVAL);
        else if (sid_devi && bp->create.sid_branch_create == NULL)
                return (EINVAL);
        else if (!prom_devi && !sid_devi)
                return (EINVAL);

        if (flags & DEVI_BRANCH_EVENT)
                return (EINVAL);

        if (prom_devi) {
                struct pta pta = {0};

                pta.pdip = pdip;
                pta.bp = bp;
                pta.flags = flags;

                error = prom_tree_access(create_prom_branch, &pta, NULL);

                if (dipp)
                        *dipp = pta.fdip;
                else if (pta.fdip)
                        ndi_rele_devi(pta.fdip);
        } else {
                error = create_sid_branch(pdip, bp, dipp, flags);
        }

        return (error);
}

int
e_ddi_branch_configure(dev_info_t *rdip, dev_info_t **dipp, uint_t flags)
{
        int             rv;
        char            *devnm;
        dev_info_t      *pdip;

        if (dipp)
                *dipp = NULL;

        if (rdip == NULL || flags != 0 || (flags & DEVI_BRANCH_EVENT))
                return (EINVAL);

        pdip = ddi_get_parent(rdip);

        ndi_hold_devi(pdip);

        if (!e_ddi_branch_held(rdip)) {
                ndi_rele_devi(pdip);
                cmn_err(CE_WARN, "e_ddi_branch_configure: "
                    "dip(%p) not held", (void *)rdip);
                return (EINVAL);
        }

        if (i_ddi_node_state(rdip) < DS_INITIALIZED) {
                /*
                 * First attempt to bind a driver. If we fail, return
                 * success (On some platforms, dips for some device
                 * types (CPUs) may not have a driver)
                 */
                if (ndi_devi_bind_driver(rdip, 0) != NDI_SUCCESS) {
                        ndi_rele_devi(pdip);
                        return (0);
                }

                if (ddi_initchild(pdip, rdip) != DDI_SUCCESS) {
                        rv = NDI_FAILURE;
                        goto out;
                }
        }

        ASSERT(i_ddi_node_state(rdip) >= DS_INITIALIZED);

        devnm = kmem_alloc(MAXNAMELEN + 1, KM_SLEEP);

        (void) ddi_deviname(rdip, devnm);

        if ((rv = ndi_devi_config_one(pdip, devnm+1, &rdip,
            NDI_DEVI_ONLINE | NDI_CONFIG)) == NDI_SUCCESS) {
                /* release hold from ndi_devi_config_one() */
                ndi_rele_devi(rdip);
        }

        kmem_free(devnm, MAXNAMELEN + 1);
out:
        if (rv != NDI_SUCCESS && dipp && rdip) {
                ndi_hold_devi(rdip);
                *dipp = rdip;
        }
        ndi_rele_devi(pdip);
        return (ndi2errno(rv));
}

void
e_ddi_branch_hold(dev_info_t *rdip)
{
        if (e_ddi_branch_held(rdip)) {
                cmn_err(CE_WARN, "e_ddi_branch_hold: branch already held");
                return;
        }

        mutex_enter(&DEVI(rdip)->devi_lock);
        if ((DEVI(rdip)->devi_flags & DEVI_BRANCH_HELD) == 0) {
                DEVI(rdip)->devi_flags |= DEVI_BRANCH_HELD;
                DEVI(rdip)->devi_ref++;
        }
        ASSERT(DEVI(rdip)->devi_ref > 0);
        mutex_exit(&DEVI(rdip)->devi_lock);
}

int
e_ddi_branch_held(dev_info_t *rdip)
{
        int rv = 0;

        mutex_enter(&DEVI(rdip)->devi_lock);
        if ((DEVI(rdip)->devi_flags & DEVI_BRANCH_HELD) &&
            DEVI(rdip)->devi_ref > 0) {
                rv = 1;
        }
        mutex_exit(&DEVI(rdip)->devi_lock);

        return (rv);
}

void
e_ddi_branch_rele(dev_info_t *rdip)
{
        mutex_enter(&DEVI(rdip)->devi_lock);
        DEVI(rdip)->devi_flags &= ~DEVI_BRANCH_HELD;
        DEVI(rdip)->devi_ref--;
        mutex_exit(&DEVI(rdip)->devi_lock);
}

int
e_ddi_branch_unconfigure(
        dev_info_t *rdip,
        dev_info_t **dipp,
        uint_t flags)
{
        int     circ, rv;
        int     destroy;
        char    *devnm;
        uint_t  nflags;
        dev_info_t *pdip;

        if (dipp)
                *dipp = NULL;

        if (rdip == NULL)
                return (EINVAL);

        pdip = ddi_get_parent(rdip);

        ASSERT(pdip);

        /*
         * Check if caller holds pdip busy - can cause deadlocks during
         * devfs_clean()
         */
        if (DEVI_BUSY_OWNED(pdip)) {
                cmn_err(CE_WARN, "e_ddi_branch_unconfigure: failed: parent"
                    " devinfo node(%p) is busy held", (void *)pdip);
                return (EINVAL);
        }

        destroy = (flags & DEVI_BRANCH_DESTROY) ? 1 : 0;

        devnm = kmem_alloc(MAXNAMELEN + 1, KM_SLEEP);

        ndi_devi_enter(pdip, &circ);
        (void) ddi_deviname(rdip, devnm);
        ndi_devi_exit(pdip, circ);

        /*
         * ddi_deviname() returns a component name with / prepended.
         */
        (void) devfs_clean(pdip, devnm + 1, DV_CLEAN_FORCE);

        ndi_devi_enter(pdip, &circ);

        /*
         * Recreate device name as it may have changed state (init/uninit)
         * when parent busy lock was dropped for devfs_clean()
         */
        (void) ddi_deviname(rdip, devnm);

        if (!e_ddi_branch_held(rdip)) {
                kmem_free(devnm, MAXNAMELEN + 1);
                ndi_devi_exit(pdip, circ);
                cmn_err(CE_WARN, "e_ddi_%s_branch: dip(%p) not held",
                    destroy ? "destroy" : "unconfigure", (void *)rdip);
                return (EINVAL);
        }

        /*
         * Release hold on the branch. This is ok since we are holding the
         * parent busy. If rdip is not removed, we must do a hold on the
         * branch before returning.
         */
        e_ddi_branch_rele(rdip);

        nflags = NDI_DEVI_OFFLINE;
        if (destroy || (flags & DEVI_BRANCH_DESTROY)) {
                nflags |= NDI_DEVI_REMOVE;
                destroy = 1;
        } else {
                nflags |= NDI_UNCONFIG;         /* uninit but don't remove */
        }

        if (flags & DEVI_BRANCH_EVENT)
                nflags |= NDI_POST_EVENT;

        if (i_ddi_devi_attached(pdip) &&
            (i_ddi_node_state(rdip) >= DS_INITIALIZED)) {
                rv = ndi_devi_unconfig_one(pdip, devnm+1, dipp, nflags);
        } else {
                rv = e_ddi_devi_unconfig(rdip, dipp, nflags);
                if (rv == NDI_SUCCESS) {
                        ASSERT(!destroy || ddi_get_child(rdip) == NULL);
                        rv = ndi_devi_offline(rdip, nflags);
                }
        }

        if (!destroy || rv != NDI_SUCCESS) {
                /* The dip still exists, so do a hold */
                e_ddi_branch_hold(rdip);
        }
out:
        kmem_free(devnm, MAXNAMELEN + 1);
        ndi_devi_exit(pdip, circ);
        return (ndi2errno(rv));
}

int
e_ddi_branch_destroy(dev_info_t *rdip, dev_info_t **dipp, uint_t flag)
{
        return (e_ddi_branch_unconfigure(rdip, dipp,
            flag|DEVI_BRANCH_DESTROY));
}

/*
 * Number of chains for hash table
 */
#define NUMCHAINS       17

/*
 * Devinfo busy arg
 */
struct devi_busy {
        int dv_total;
        int s_total;
        mod_hash_t *dv_hash;
        mod_hash_t *s_hash;
        int (*callback)(dev_info_t *, void *, uint_t);
        void *arg;
};

static int
visit_dip(dev_info_t *dip, void *arg)
{
        uintptr_t sbusy, dvbusy, ref;
        struct devi_busy *bsp = arg;

        ASSERT(bsp->callback);

        /*
         * A dip cannot be busy if its reference count is 0
         */
        if ((ref = e_ddi_devi_holdcnt(dip)) == 0) {
                return (bsp->callback(dip, bsp->arg, 0));
        }

        if (mod_hash_find(bsp->dv_hash, dip, (mod_hash_val_t *)&dvbusy))
                dvbusy = 0;

        /*
         * To catch device opens currently maintained on specfs common snodes.
         */
        if (mod_hash_find(bsp->s_hash, dip, (mod_hash_val_t *)&sbusy))
                sbusy = 0;

#ifdef  DEBUG
        if (ref < sbusy || ref < dvbusy) {
                cmn_err(CE_WARN, "dip(%p): sopen = %lu, dvopen = %lu "
                    "dip ref = %lu\n", (void *)dip, sbusy, dvbusy, ref);
        }
#endif

        dvbusy = (sbusy > dvbusy) ? sbusy : dvbusy;

        return (bsp->callback(dip, bsp->arg, dvbusy));
}

static int
visit_snode(struct snode *sp, void *arg)
{
        uintptr_t sbusy;
        dev_info_t *dip;
        int count;
        struct devi_busy *bsp = arg;

        ASSERT(sp);

        /*
         * The stable lock is held. This prevents
         * the snode and its associated dip from
         * going away.
         */
        dip = NULL;
        count = spec_devi_open_count(sp, &dip);

        if (count <= 0)
                return (DDI_WALK_CONTINUE);

        ASSERT(dip);

        if (mod_hash_remove(bsp->s_hash, dip, (mod_hash_val_t *)&sbusy))
                sbusy = count;
        else
                sbusy += count;

        if (mod_hash_insert(bsp->s_hash, dip, (mod_hash_val_t)sbusy)) {
                cmn_err(CE_WARN, "%s: s_hash insert failed: dip=0x%p, "
                    "sbusy = %lu", "e_ddi_branch_referenced",
                    (void *)dip, sbusy);
        }

        bsp->s_total += count;

        return (DDI_WALK_CONTINUE);
}

static void
visit_dvnode(struct dv_node *dv, void *arg)
{
        uintptr_t dvbusy;
        uint_t count;
        struct vnode *vp;
        struct devi_busy *bsp = arg;

        ASSERT(dv && dv->dv_devi);

        vp = DVTOV(dv);

        mutex_enter(&vp->v_lock);
        count = vp->v_count;
        mutex_exit(&vp->v_lock);

        if (!count)
                return;

        if (mod_hash_remove(bsp->dv_hash, dv->dv_devi,
            (mod_hash_val_t *)&dvbusy))
                dvbusy = count;
        else
                dvbusy += count;

        if (mod_hash_insert(bsp->dv_hash, dv->dv_devi,
            (mod_hash_val_t)dvbusy)) {
                cmn_err(CE_WARN, "%s: dv_hash insert failed: dip=0x%p, "
                    "dvbusy=%lu", "e_ddi_branch_referenced",
                    (void *)dv->dv_devi, dvbusy);
        }

        bsp->dv_total += count;
}

/*
 * Returns reference count on success or -1 on failure.
 */
int
e_ddi_branch_referenced(
        dev_info_t *rdip,
        int (*callback)(dev_info_t *dip, void *arg, uint_t ref),
        void *arg)
{
        int circ;
        char *path;
        dev_info_t *pdip;
        struct devi_busy bsa = {0};

        ASSERT(rdip);

        path = kmem_alloc(MAXPATHLEN, KM_SLEEP);

        ndi_hold_devi(rdip);

        pdip = ddi_get_parent(rdip);

        ASSERT(pdip);

        /*
         * Check if caller holds pdip busy - can cause deadlocks during
         * devfs_walk()
         */
        if (!e_ddi_branch_held(rdip) || DEVI_BUSY_OWNED(pdip)) {
                cmn_err(CE_WARN, "e_ddi_branch_referenced: failed: "
                    "devinfo branch(%p) not held or parent busy held",
                    (void *)rdip);
                ndi_rele_devi(rdip);
                kmem_free(path, MAXPATHLEN);
                return (-1);
        }

        ndi_devi_enter(pdip, &circ);
        (void) ddi_pathname(rdip, path);
        ndi_devi_exit(pdip, circ);

        bsa.dv_hash = mod_hash_create_ptrhash("dv_node busy hash", NUMCHAINS,
            mod_hash_null_valdtor, sizeof (struct dev_info));

        bsa.s_hash = mod_hash_create_ptrhash("snode busy hash", NUMCHAINS,
            mod_hash_null_valdtor, sizeof (struct snode));

        if (devfs_walk(path, visit_dvnode, &bsa)) {
                cmn_err(CE_WARN, "e_ddi_branch_referenced: "
                    "devfs walk failed for: %s", path);
                kmem_free(path, MAXPATHLEN);
                bsa.s_total = bsa.dv_total = -1;
                goto out;
        }

        kmem_free(path, MAXPATHLEN);

        /*
         * Walk the snode table to detect device opens, which are currently
         * maintained on specfs common snodes.
         */
        spec_snode_walk(visit_snode, &bsa);

        if (callback == NULL)
                goto out;

        bsa.callback = callback;
        bsa.arg = arg;

        if (visit_dip(rdip, &bsa) == DDI_WALK_CONTINUE) {
                ndi_devi_enter(rdip, &circ);
                ddi_walk_devs(ddi_get_child(rdip), visit_dip, &bsa);
                ndi_devi_exit(rdip, circ);
        }

out:
        ndi_rele_devi(rdip);
        mod_hash_destroy_ptrhash(bsa.s_hash);
        mod_hash_destroy_ptrhash(bsa.dv_hash);
        return (bsa.s_total > bsa.dv_total ? bsa.s_total : bsa.dv_total);
}