7461 illumos should support multiboot2 protocol

[unleashed.git] / usr / src / uts / i86pc / os / fakebop.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 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2010, Intel Corporation.
 * All rights reserved.
 *
 * Copyright 2013 Joyent, Inc.  All rights reserved.
 */

/*
 * This file contains the functionality that mimics the boot operations
 * on SPARC systems or the old boot.bin/multiboot programs on x86 systems.
 * The x86 kernel now does everything on its own.
 */

#include <sys/types.h>
#include <sys/bootconf.h>
#include <sys/bootsvcs.h>
#include <sys/bootinfo.h>
#include <sys/multiboot.h>
#include <sys/multiboot2.h>
#include <sys/multiboot2_impl.h>
#include <sys/bootvfs.h>
#include <sys/bootprops.h>
#include <sys/varargs.h>
#include <sys/param.h>
#include <sys/machparam.h>
#include <sys/machsystm.h>
#include <sys/archsystm.h>
#include <sys/boot_console.h>
#include <sys/cmn_err.h>
#include <sys/systm.h>
#include <sys/promif.h>
#include <sys/archsystm.h>
#include <sys/x86_archext.h>
#include <sys/kobj.h>
#include <sys/privregs.h>
#include <sys/sysmacros.h>
#include <sys/ctype.h>
#include <sys/fastboot.h>
#ifdef __xpv
#include <sys/hypervisor.h>
#include <net/if.h>
#endif
#include <vm/kboot_mmu.h>
#include <vm/hat_pte.h>
#include <sys/kobj.h>
#include <sys/kobj_lex.h>
#include <sys/pci_cfgspace_impl.h>
#include <sys/fastboot_impl.h>
#include <sys/acpi/acconfig.h>
#include <sys/acpi/acpi.h>

static int have_console = 0;    /* set once primitive console is initialized */
static char *boot_args = "";

/*
 * Debugging macros
 */
static uint_t kbm_debug = 0;
#define DBG_MSG(s)      { if (kbm_debug) bop_printf(NULL, "%s", s); }
#define DBG(x)          { if (kbm_debug)                        \
        bop_printf(NULL, "%s is %" PRIx64 "\n", #x, (uint64_t)(x));     \
        }

#define PUT_STRING(s) {                         \
        char *cp;                               \
        for (cp = (s); *cp; ++cp)               \
                bcons_putchar(*cp);             \
        }

bootops_t bootop;       /* simple bootops we'll pass on to kernel */
struct bsys_mem bm;

/*
 * Boot info from "glue" code in low memory. xbootp is used by:
 *      do_bop_phys_alloc(), do_bsys_alloc() and boot_prop_finish().
 */
static struct xboot_info *xbootp;
static uintptr_t next_virt;     /* next available virtual address */
static paddr_t next_phys;       /* next available physical address from dboot */
static paddr_t high_phys = -(paddr_t)1; /* last used physical address */

/*
 * buffer for vsnprintf for console I/O
 */
#define BUFFERSIZE      512
static char buffer[BUFFERSIZE];

/*
 * stuff to store/report/manipulate boot property settings.
 */
typedef struct bootprop {
        struct bootprop *bp_next;
        char *bp_name;
        uint_t bp_vlen;
        char *bp_value;
} bootprop_t;

static bootprop_t *bprops = NULL;
static char *curr_page = NULL;          /* ptr to avail bprop memory */
static int curr_space = 0;              /* amount of memory at curr_page */

#ifdef __xpv
start_info_t *xen_info;
shared_info_t *HYPERVISOR_shared_info;
#endif

/*
 * some allocator statistics
 */
static ulong_t total_bop_alloc_scratch = 0;
static ulong_t total_bop_alloc_kernel = 0;

static void build_firmware_properties(struct xboot_info *);

static int early_allocation = 1;

int force_fastreboot = 0;
volatile int fastreboot_onpanic = 0;
int post_fastreboot = 0;
#ifdef  __xpv
volatile int fastreboot_capable = 0;
#else
volatile int fastreboot_capable = 1;
#endif

/*
 * Information saved from current boot for fast reboot.
 * If the information size exceeds what we have allocated, fast reboot
 * will not be supported.
 */
multiboot_info_t saved_mbi;
mb_memory_map_t saved_mmap[FASTBOOT_SAVED_MMAP_COUNT];
uint8_t saved_drives[FASTBOOT_SAVED_DRIVES_SIZE];
char saved_cmdline[FASTBOOT_SAVED_CMDLINE_LEN];
int saved_cmdline_len = 0;
size_t saved_file_size[FASTBOOT_MAX_FILES_MAP];

/*
 * Turn off fastreboot_onpanic to avoid panic loop.
 */
char fastreboot_onpanic_cmdline[FASTBOOT_SAVED_CMDLINE_LEN];
static const char fastreboot_onpanic_args[] = " -B fastreboot_onpanic=0";

/*
 * Pointers to where System Resource Affinity Table (SRAT), System Locality
 * Information Table (SLIT) and Maximum System Capability Table (MSCT)
 * are mapped into virtual memory
 */
ACPI_TABLE_SRAT *srat_ptr = NULL;
ACPI_TABLE_SLIT *slit_ptr = NULL;
ACPI_TABLE_MSCT *msct_ptr = NULL;

/*
 * Arbitrary limit on number of localities we handle; if
 * this limit is raised to more than UINT16_MAX, make sure
 * process_slit() knows how to handle it.
 */
#define SLIT_LOCALITIES_MAX     (4096)

#define SLIT_NUM_PROPNAME       "acpi-slit-localities"
#define SLIT_PROPNAME           "acpi-slit"

/*
 * Allocate aligned physical memory at boot time. This allocator allocates
 * from the highest possible addresses. This avoids exhausting memory that
 * would be useful for DMA buffers.
 */
paddr_t
do_bop_phys_alloc(uint64_t size, uint64_t align)
{
        paddr_t pa = 0;
        paddr_t start;
        paddr_t end;
        struct memlist  *ml = (struct memlist *)xbootp->bi_phys_install;

        /*
         * Be careful if high memory usage is limited in startup.c
         * Since there are holes in the low part of the physical address
         * space we can treat physmem as a pfn (not just a pgcnt) and
         * get a conservative upper limit.
         */
        if (physmem != 0 && high_phys > pfn_to_pa(physmem))
                high_phys = pfn_to_pa(physmem);

        /*
         * find the lowest or highest available memory in physinstalled
         * On 32 bit avoid physmem above 4Gig if PAE isn't enabled
         */
#if defined(__i386)
        if (xbootp->bi_use_pae == 0 && high_phys > FOUR_GIG)
                high_phys = FOUR_GIG;
#endif

        /*
         * find the highest available memory in physinstalled
         */
        size = P2ROUNDUP(size, align);
        for (; ml; ml = ml->ml_next) {
                start = P2ROUNDUP(ml->ml_address, align);
                end = P2ALIGN(ml->ml_address + ml->ml_size, align);
                if (start < next_phys)
                        start = P2ROUNDUP(next_phys, align);
                if (end > high_phys)
                        end = P2ALIGN(high_phys, align);

                if (end <= start)
                        continue;
                if (end - start < size)
                        continue;

                /*
                 * Early allocations need to use low memory, since
                 * physmem might be further limited by bootenv.rc
                 */
                if (early_allocation) {
                        if (pa == 0 || start < pa)
                                pa = start;
                } else {
                        if (end - size > pa)
                                pa = end - size;
                }
        }
        if (pa != 0) {
                if (early_allocation)
                        next_phys = pa + size;
                else
                        high_phys = pa;
                return (pa);
        }
        bop_panic("do_bop_phys_alloc(0x%" PRIx64 ", 0x%" PRIx64
            ") Out of memory\n", size, align);
        /*NOTREACHED*/
}

uintptr_t
alloc_vaddr(size_t size, paddr_t align)
{
        uintptr_t rv;

        next_virt = P2ROUNDUP(next_virt, (uintptr_t)align);
        rv = (uintptr_t)next_virt;
        next_virt += size;
        return (rv);
}

/*
 * Allocate virtual memory. The size is always rounded up to a multiple
 * of base pagesize.
 */

/*ARGSUSED*/
static caddr_t
do_bsys_alloc(bootops_t *bop, caddr_t virthint, size_t size, int align)
{
        paddr_t a = align;      /* same type as pa for masking */
        uint_t pgsize;
        paddr_t pa;
        uintptr_t va;
        ssize_t s;              /* the aligned size */
        uint_t level;
        uint_t is_kernel = (virthint != 0);

        if (a < MMU_PAGESIZE)
                a = MMU_PAGESIZE;
        else if (!ISP2(a))
                prom_panic("do_bsys_alloc() incorrect alignment");
        size = P2ROUNDUP(size, MMU_PAGESIZE);

        /*
         * Use the next aligned virtual address if we weren't given one.
         */
        if (virthint == NULL) {
                virthint = (caddr_t)alloc_vaddr(size, a);
                total_bop_alloc_scratch += size;
        } else {
                total_bop_alloc_kernel += size;
        }

        /*
         * allocate the physical memory
         */
        pa = do_bop_phys_alloc(size, a);

        /*
         * Add the mappings to the page tables, try large pages first.
         */
        va = (uintptr_t)virthint;
        s = size;
        level = 1;
        pgsize = xbootp->bi_use_pae ? TWO_MEG : FOUR_MEG;
        if (xbootp->bi_use_largepage && a == pgsize) {
                while (IS_P2ALIGNED(pa, pgsize) && IS_P2ALIGNED(va, pgsize) &&
                    s >= pgsize) {
                        kbm_map(va, pa, level, is_kernel);
                        va += pgsize;
                        pa += pgsize;
                        s -= pgsize;
                }
        }

        /*
         * Map remaining pages use small mappings
         */
        level = 0;
        pgsize = MMU_PAGESIZE;
        while (s > 0) {
                kbm_map(va, pa, level, is_kernel);
                va += pgsize;
                pa += pgsize;
                s -= pgsize;
        }
        return (virthint);
}

/*
 * Free virtual memory - we'll just ignore these.
 */
/*ARGSUSED*/
static void
do_bsys_free(bootops_t *bop, caddr_t virt, size_t size)
{
        bop_printf(NULL, "do_bsys_free(virt=0x%p, size=0x%lx) ignored\n",
            (void *)virt, size);
}

/*
 * Old interface
 */
/*ARGSUSED*/
static caddr_t
do_bsys_ealloc(bootops_t *bop, caddr_t virthint, size_t size,
    int align, int flags)
{
        prom_panic("unsupported call to BOP_EALLOC()\n");
        return (0);
}


static void
bsetprop(char *name, int nlen, void *value, int vlen)
{
        uint_t size;
        uint_t need_size;
        bootprop_t *b;

        /*
         * align the size to 16 byte boundary
         */
        size = sizeof (bootprop_t) + nlen + 1 + vlen;
        size = (size + 0xf) & ~0xf;
        if (size > curr_space) {
                need_size = (size + (MMU_PAGEOFFSET)) & MMU_PAGEMASK;
                curr_page = do_bsys_alloc(NULL, 0, need_size, MMU_PAGESIZE);
                curr_space = need_size;
        }

        /*
         * use a bootprop_t at curr_page and link into list
         */
        b = (bootprop_t *)curr_page;
        curr_page += sizeof (bootprop_t);
        curr_space -=  sizeof (bootprop_t);
        b->bp_next = bprops;
        bprops = b;

        /*
         * follow by name and ending zero byte
         */
        b->bp_name = curr_page;
        bcopy(name, curr_page, nlen);
        curr_page += nlen;
        *curr_page++ = 0;
        curr_space -= nlen + 1;

        /*
         * copy in value, but no ending zero byte
         */
        b->bp_value = curr_page;
        b->bp_vlen = vlen;
        if (vlen > 0) {
                bcopy(value, curr_page, vlen);
                curr_page += vlen;
                curr_space -= vlen;
        }

        /*
         * align new values of curr_page, curr_space
         */
        while (curr_space & 0xf) {
                ++curr_page;
                --curr_space;
        }
}

static void
bsetprops(char *name, char *value)
{
        bsetprop(name, strlen(name), value, strlen(value) + 1);
}

static void
bsetprop64(char *name, uint64_t value)
{
        bsetprop(name, strlen(name), (void *)&value, sizeof (value));
}

static void
bsetpropsi(char *name, int value)
{
        char prop_val[32];

        (void) snprintf(prop_val, sizeof (prop_val), "%d", value);
        bsetprops(name, prop_val);
}

/*
 * to find the size of the buffer to allocate
 */
/*ARGSUSED*/
int
do_bsys_getproplen(bootops_t *bop, const char *name)
{
        bootprop_t *b;

        for (b = bprops; b; b = b->bp_next) {
                if (strcmp(name, b->bp_name) != 0)
                        continue;
                return (b->bp_vlen);
        }
        return (-1);
}

/*
 * get the value associated with this name
 */
/*ARGSUSED*/
int
do_bsys_getprop(bootops_t *bop, const char *name, void *value)
{
        bootprop_t *b;

        for (b = bprops; b; b = b->bp_next) {
                if (strcmp(name, b->bp_name) != 0)
                        continue;
                bcopy(b->bp_value, value, b->bp_vlen);
                return (0);
        }
        return (-1);
}

/*
 * get the name of the next property in succession from the standalone
 */
/*ARGSUSED*/
static char *
do_bsys_nextprop(bootops_t *bop, char *name)
{
        bootprop_t *b;

        /*
         * A null name is a special signal for the 1st boot property
         */
        if (name == NULL || strlen(name) == 0) {
                if (bprops == NULL)
                        return (NULL);
                return (bprops->bp_name);
        }

        for (b = bprops; b; b = b->bp_next) {
                if (name != b->bp_name)
                        continue;
                b = b->bp_next;
                if (b == NULL)
                        return (NULL);
                return (b->bp_name);
        }
        return (NULL);
}

/*
 * Parse numeric value from a string. Understands decimal, hex, octal, - and ~
 */
static int
parse_value(char *p, uint64_t *retval)
{
        int adjust = 0;
        uint64_t tmp = 0;
        int digit;
        int radix = 10;

        *retval = 0;
        if (*p == '-' || *p == '~')
                adjust = *p++;

        if (*p == '0') {
                ++p;
                if (*p == 0)
                        return (0);
                if (*p == 'x' || *p == 'X') {
                        radix = 16;
                        ++p;
                } else {
                        radix = 8;
                        ++p;
                }
        }
        while (*p) {
                if ('0' <= *p && *p <= '9')
                        digit = *p - '0';
                else if ('a' <= *p && *p <= 'f')
                        digit = 10 + *p - 'a';
                else if ('A' <= *p && *p <= 'F')
                        digit = 10 + *p - 'A';
                else
                        return (-1);
                if (digit >= radix)
                        return (-1);
                tmp = tmp * radix + digit;
                ++p;
        }
        if (adjust == '-')
                tmp = -tmp;
        else if (adjust == '~')
                tmp = ~tmp;
        *retval = tmp;
        return (0);
}

static boolean_t
unprintable(char *value, int size)
{
        int i;

        if (size <= 0 || value[0] == '\0')
                return (B_TRUE);

        for (i = 0; i < size; i++) {
                if (value[i] == '\0')
                        return (i != (size - 1));

                if (!isprint(value[i]))
                        return (B_TRUE);
        }
        return (B_FALSE);
}

/*
 * Print out information about all boot properties.
 * buffer is pointer to pre-allocated space to be used as temporary
 * space for property values.
 */
static void
boot_prop_display(char *buffer)
{
        char *name = "";
        int i, len;

        bop_printf(NULL, "\nBoot properties:\n");

        while ((name = do_bsys_nextprop(NULL, name)) != NULL) {
                bop_printf(NULL, "\t0x%p %s = ", (void *)name, name);
                (void) do_bsys_getprop(NULL, name, buffer);
                len = do_bsys_getproplen(NULL, name);
                bop_printf(NULL, "len=%d ", len);
                if (!unprintable(buffer, len)) {
                        buffer[len] = 0;
                        bop_printf(NULL, "%s\n", buffer);
                        continue;
                }
                for (i = 0; i < len; i++) {
                        bop_printf(NULL, "%02x", buffer[i] & 0xff);
                        if (i < len - 1)
                                bop_printf(NULL, ".");
                }
                bop_printf(NULL, "\n");
        }
}

/*
 * 2nd part of building the table of boot properties. This includes:
 * - values from /boot/solaris/bootenv.rc (ie. eeprom(1m) values)
 *
 * lines look like one of:
 * ^$
 * ^# comment till end of line
 * setprop name 'value'
 * setprop name value
 * setprop name "value"
 *
 * we do single character I/O since this is really just looking at memory
 */
void
boot_prop_finish(void)
{
        int fd;
        char *line;
        int c;
        int bytes_read;
        char *name;
        int n_len;
        char *value;
        int v_len;
        char *inputdev; /* these override the command line if serial ports */
        char *outputdev;
        char *consoledev;
        uint64_t lvalue;
        int use_xencons = 0;

#ifdef __xpv
        if (!DOMAIN_IS_INITDOMAIN(xen_info))
                use_xencons = 1;
#endif /* __xpv */

        DBG_MSG("Opening /boot/solaris/bootenv.rc\n");
        fd = BRD_OPEN(bfs_ops, "/boot/solaris/bootenv.rc", 0);
        DBG(fd);

        line = do_bsys_alloc(NULL, NULL, MMU_PAGESIZE, MMU_PAGESIZE);
        while (fd >= 0) {

                /*
                 * get a line
                 */
                for (c = 0; ; ++c) {
                        bytes_read = BRD_READ(bfs_ops, fd, line + c, 1);
                        if (bytes_read == 0) {
                                if (c == 0)
                                        goto done;
                                break;
                        }
                        if (line[c] == '\n')
                                break;
                }
                line[c] = 0;

                /*
                 * ignore comment lines
                 */
                c = 0;
                while (ISSPACE(line[c]))
                        ++c;
                if (line[c] == '#' || line[c] == 0)
                        continue;

                /*
                 * must have "setprop " or "setprop\t"
                 */
                if (strncmp(line + c, "setprop ", 8) != 0 &&
                    strncmp(line + c, "setprop\t", 8) != 0)
                        continue;
                c += 8;
                while (ISSPACE(line[c]))
                        ++c;
                if (line[c] == 0)
                        continue;

                /*
                 * gather up the property name
                 */
                name = line + c;
                n_len = 0;
                while (line[c] && !ISSPACE(line[c]))
                        ++n_len, ++c;

                /*
                 * gather up the value, if any
                 */
                value = "";
                v_len = 0;
                while (ISSPACE(line[c]))
                        ++c;
                if (line[c] != 0) {
                        value = line + c;
                        while (line[c] && !ISSPACE(line[c]))
                                ++v_len, ++c;
                }

                if (v_len >= 2 && value[0] == value[v_len - 1] &&
                    (value[0] == '\'' || value[0] == '"')) {
                        ++value;
                        v_len -= 2;
                }
                name[n_len] = 0;
                if (v_len > 0)
                        value[v_len] = 0;
                else
                        continue;

                /*
                 * ignore "boot-file" property, it's now meaningless
                 */
                if (strcmp(name, "boot-file") == 0)
                        continue;
                if (strcmp(name, "boot-args") == 0 &&
                    strlen(boot_args) > 0)
                        continue;

                /*
                 * If a property was explicitly set on the command line
                 * it will override a setting in bootenv.rc
                 */
                if (do_bsys_getproplen(NULL, name) > 0)
                        continue;

                bsetprop(name, n_len, value, v_len + 1);
        }
done:
        if (fd >= 0)
                (void) BRD_CLOSE(bfs_ops, fd);

        /*
         * Check if we have to limit the boot time allocator
         */
        if (do_bsys_getproplen(NULL, "physmem") != -1 &&
            do_bsys_getprop(NULL, "physmem", line) >= 0 &&
            parse_value(line, &lvalue) != -1) {
                if (0 < lvalue && (lvalue < physmem || physmem == 0)) {
                        physmem = (pgcnt_t)lvalue;
                        DBG(physmem);
                }
        }
        early_allocation = 0;

        /*
         * check to see if we have to override the default value of the console
         */
        if (!use_xencons) {
                inputdev = line;
                v_len = do_bsys_getproplen(NULL, "input-device");
                if (v_len > 0)
                        (void) do_bsys_getprop(NULL, "input-device", inputdev);
                else
                        v_len = 0;
                inputdev[v_len] = 0;

                outputdev = inputdev + v_len + 1;
                v_len = do_bsys_getproplen(NULL, "output-device");
                if (v_len > 0)
                        (void) do_bsys_getprop(NULL, "output-device",
                            outputdev);
                else
                        v_len = 0;
                outputdev[v_len] = 0;

                consoledev = outputdev + v_len + 1;
                v_len = do_bsys_getproplen(NULL, "console");
                if (v_len > 0) {
                        (void) do_bsys_getprop(NULL, "console", consoledev);
                        if (post_fastreboot &&
                            strcmp(consoledev, "graphics") == 0) {
                                bsetprops("console", "text");
                                v_len = strlen("text");
                                bcopy("text", consoledev, v_len);
                        }
                } else {
                        v_len = 0;
                }
                consoledev[v_len] = 0;
                bcons_init2(inputdev, outputdev, consoledev);
        } else {
                /*
                 * Ensure console property exists
                 * If not create it as "hypervisor"
                 */
                v_len = do_bsys_getproplen(NULL, "console");
                if (v_len < 0)
                        bsetprops("console", "hypervisor");
                inputdev = outputdev = consoledev = "hypervisor";
                bcons_init2(inputdev, outputdev, consoledev);
        }

        if (strstr((char *)xbootp->bi_cmdline, "prom_debug") || kbm_debug)
                boot_prop_display(line);
}

/*
 * print formatted output
 */
/*PRINTFLIKE2*/
/*ARGSUSED*/
void
bop_printf(bootops_t *bop, const char *fmt, ...)
{
        va_list ap;

        if (have_console == 0)
                return;

        va_start(ap, fmt);
        (void) vsnprintf(buffer, BUFFERSIZE, fmt, ap);
        va_end(ap);
        PUT_STRING(buffer);
}

/*
 * Another panic() variant; this one can be used even earlier during boot than
 * prom_panic().
 */
/*PRINTFLIKE1*/
void
bop_panic(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        bop_printf(NULL, fmt, ap);
        va_end(ap);

        bop_printf(NULL, "\nPress any key to reboot.\n");
        (void) bcons_getchar();
        bop_printf(NULL, "Resetting...\n");
        pc_reset();
}

/*
 * Do a real mode interrupt BIOS call
 */
typedef struct bios_regs {
        unsigned short ax, bx, cx, dx, si, di, bp, es, ds;
} bios_regs_t;
typedef int (*bios_func_t)(int, bios_regs_t *);

/*ARGSUSED*/
static void
do_bsys_doint(bootops_t *bop, int intnum, struct bop_regs *rp)
{
#if defined(__xpv)
        prom_panic("unsupported call to BOP_DOINT()\n");
#else   /* __xpv */
        static int firsttime = 1;
        bios_func_t bios_func = (bios_func_t)(void *)(uintptr_t)0x5000;
        bios_regs_t br;

        /*
         * The first time we do this, we have to copy the pre-packaged
         * low memory bios call code image into place.
         */
        if (firsttime) {
                extern char bios_image[];
                extern uint32_t bios_size;

                bcopy(bios_image, (void *)bios_func, bios_size);
                firsttime = 0;
        }

        br.ax = rp->eax.word.ax;
        br.bx = rp->ebx.word.bx;
        br.cx = rp->ecx.word.cx;
        br.dx = rp->edx.word.dx;
        br.bp = rp->ebp.word.bp;
        br.si = rp->esi.word.si;
        br.di = rp->edi.word.di;
        br.ds = rp->ds;
        br.es = rp->es;

        DBG_MSG("Doing BIOS call...");
        DBG(br.ax);
        DBG(br.bx);
        DBG(br.dx);
        rp->eflags = bios_func(intnum, &br);
        DBG_MSG("done\n");

        rp->eax.word.ax = br.ax;
        rp->ebx.word.bx = br.bx;
        rp->ecx.word.cx = br.cx;
        rp->edx.word.dx = br.dx;
        rp->ebp.word.bp = br.bp;
        rp->esi.word.si = br.si;
        rp->edi.word.di = br.di;
        rp->ds = br.ds;
        rp->es = br.es;
#endif /* __xpv */
}

static struct boot_syscalls bop_sysp = {
        bcons_getchar,
        bcons_putchar,
        bcons_ischar,
};

static char *whoami;

#define BUFLEN  64

#if defined(__xpv)

static char namebuf[32];

static void
xen_parse_props(char *s, char *prop_map[], int n_prop)
{
        char **prop_name = prop_map;
        char *cp = s, *scp;

        do {
                scp = cp;
                while ((*cp != NULL) && (*cp != ':'))
                        cp++;

                if ((scp != cp) && (*prop_name != NULL)) {
                        *cp = NULL;
                        bsetprops(*prop_name, scp);
                }

                cp++;
                prop_name++;
                n_prop--;
        } while (n_prop > 0);
}

#define VBDPATHLEN      64

/*
 * parse the 'xpv-root' property to create properties used by
 * ufs_mountroot.
 */
static void
xen_vbdroot_props(char *s)
{
        char vbdpath[VBDPATHLEN] = "/xpvd/xdf@";
        const char lnamefix[] = "/dev/dsk/c0d";
        char *pnp;
        char *prop_p;
        char mi;
        short minor;
        long addr = 0;

        pnp = vbdpath + strlen(vbdpath);
        prop_p = s + strlen(lnamefix);
        while ((*prop_p != '\0') && (*prop_p != 's') && (*prop_p != 'p'))
                addr = addr * 10 + *prop_p++ - '0';
        (void) snprintf(pnp, VBDPATHLEN, "%lx", addr);
        pnp = vbdpath + strlen(vbdpath);
        if (*prop_p == 's')
                mi = 'a';
        else if (*prop_p == 'p')
                mi = 'q';
        else
                ASSERT(0); /* shouldn't be here */
        prop_p++;
        ASSERT(*prop_p != '\0');
        if (ISDIGIT(*prop_p)) {
                minor = *prop_p - '0';
                prop_p++;
                if (ISDIGIT(*prop_p)) {
                        minor = minor * 10 + *prop_p - '0';
                }
        } else {
                /* malformed root path, use 0 as default */
                minor = 0;
        }
        ASSERT(minor < 16); /* at most 16 partitions */
        mi += minor;
        *pnp++ = ':';
        *pnp++ = mi;
        *pnp++ = '\0';
        bsetprops("fstype", "ufs");
        bsetprops("bootpath", vbdpath);

        DBG_MSG("VBD bootpath set to ");
        DBG_MSG(vbdpath);
        DBG_MSG("\n");
}

/*
 * parse the xpv-nfsroot property to create properties used by
 * nfs_mountroot.
 */
static void
xen_nfsroot_props(char *s)
{
        char *prop_map[] = {
                BP_SERVER_IP,   /* server IP address */
                BP_SERVER_NAME, /* server hostname */
                BP_SERVER_PATH, /* root path */
        };
        int n_prop = sizeof (prop_map) / sizeof (prop_map[0]);

        bsetprop("fstype", 6, "nfs", 4);

        xen_parse_props(s, prop_map, n_prop);

        /*
         * If a server name wasn't specified, use a default.
         */
        if (do_bsys_getproplen(NULL, BP_SERVER_NAME) == -1)
                bsetprops(BP_SERVER_NAME, "unknown");
}

/*
 * Extract our IP address, etc. from the "xpv-ip" property.
 */
static void
xen_ip_props(char *s)
{
        char *prop_map[] = {
                BP_HOST_IP,             /* IP address */
                NULL,                   /* NFS server IP address (ignored in */
                                        /* favour of xpv-nfsroot) */
                BP_ROUTER_IP,           /* IP gateway */
                BP_SUBNET_MASK,         /* IP subnet mask */
                "xpv-hostname",         /* hostname (ignored) */
                BP_NETWORK_INTERFACE,   /* interface name */
                "xpv-hcp",              /* host configuration protocol */
        };
        int n_prop = sizeof (prop_map) / sizeof (prop_map[0]);
        char ifname[IFNAMSIZ];

        xen_parse_props(s, prop_map, n_prop);

        /*
         * A Linux dom0 administrator expects all interfaces to be
         * called "ethX", which is not the case here.
         *
         * If the interface name specified is "eth0", presume that
         * this is really intended to be "xnf0" (the first domU ->
         * dom0 interface for this domain).
         */
        if ((do_bsys_getprop(NULL, BP_NETWORK_INTERFACE, ifname) == 0) &&
            (strcmp("eth0", ifname) == 0)) {
                bsetprops(BP_NETWORK_INTERFACE, "xnf0");
                bop_printf(NULL,
                    "network interface name 'eth0' replaced with 'xnf0'\n");
        }
}

#else   /* __xpv */

static void
setup_rarp_props(struct sol_netinfo *sip)
{
        char buf[BUFLEN];       /* to hold ip/mac addrs */
        uint8_t *val;

        val = (uint8_t *)&sip->sn_ciaddr;
        (void) snprintf(buf, BUFLEN, "%d.%d.%d.%d",
            val[0], val[1], val[2], val[3]);
        bsetprops(BP_HOST_IP, buf);

        val = (uint8_t *)&sip->sn_siaddr;
        (void) snprintf(buf, BUFLEN, "%d.%d.%d.%d",
            val[0], val[1], val[2], val[3]);
        bsetprops(BP_SERVER_IP, buf);

        if (sip->sn_giaddr != 0) {
                val = (uint8_t *)&sip->sn_giaddr;
                (void) snprintf(buf, BUFLEN, "%d.%d.%d.%d",
                    val[0], val[1], val[2], val[3]);
                bsetprops(BP_ROUTER_IP, buf);
        }

        if (sip->sn_netmask != 0) {
                val = (uint8_t *)&sip->sn_netmask;
                (void) snprintf(buf, BUFLEN, "%d.%d.%d.%d",
                    val[0], val[1], val[2], val[3]);
                bsetprops(BP_SUBNET_MASK, buf);
        }

        if (sip->sn_mactype != 4 || sip->sn_maclen != 6) {
                bop_printf(NULL, "unsupported mac type %d, mac len %d\n",
                    sip->sn_mactype, sip->sn_maclen);
        } else {
                val = sip->sn_macaddr;
                (void) snprintf(buf, BUFLEN, "%x:%x:%x:%x:%x:%x",
                    val[0], val[1], val[2], val[3], val[4], val[5]);
                bsetprops(BP_BOOT_MAC, buf);
        }
}

#endif  /* __xpv */

static void
build_panic_cmdline(const char *cmd, int cmdlen)
{
        int proplen;
        size_t arglen;

        arglen = sizeof (fastreboot_onpanic_args);
        /*
         * If we allready have fastreboot-onpanic set to zero,
         * don't add them again.
         */
        if ((proplen = do_bsys_getproplen(NULL, FASTREBOOT_ONPANIC)) > 0 &&
            proplen <=  sizeof (fastreboot_onpanic_cmdline)) {
                (void) do_bsys_getprop(NULL, FASTREBOOT_ONPANIC,
                    fastreboot_onpanic_cmdline);
                if (FASTREBOOT_ONPANIC_NOTSET(fastreboot_onpanic_cmdline))
                        arglen = 1;
        }

        /*
         * construct fastreboot_onpanic_cmdline
         */
        if (cmdlen + arglen > sizeof (fastreboot_onpanic_cmdline)) {
                DBG_MSG("Command line too long: clearing "
                    FASTREBOOT_ONPANIC "\n");
                fastreboot_onpanic = 0;
        } else {
                bcopy(cmd, fastreboot_onpanic_cmdline, cmdlen);
                if (arglen != 1)
                        bcopy(fastreboot_onpanic_args,
                            fastreboot_onpanic_cmdline + cmdlen, arglen);
                else
                        fastreboot_onpanic_cmdline[cmdlen] = 0;
        }
}


#ifndef __xpv
/*
 * Construct boot command line for Fast Reboot. The saved_cmdline
 * is also reported by "eeprom bootcmd".
 */
static void
build_fastboot_cmdline(struct xboot_info *xbp)
{
        saved_cmdline_len =  strlen(xbp->bi_cmdline) + 1;
        if (saved_cmdline_len > FASTBOOT_SAVED_CMDLINE_LEN) {
                DBG(saved_cmdline_len);
                DBG_MSG("Command line too long: clearing fastreboot_capable\n");
                fastreboot_capable = 0;
        } else {
                bcopy((void *)(xbp->bi_cmdline), (void *)saved_cmdline,
                    saved_cmdline_len);
                saved_cmdline[saved_cmdline_len - 1] = '\0';
                build_panic_cmdline(saved_cmdline, saved_cmdline_len - 1);
        }
}

/*
 * Save memory layout, disk drive information, unix and boot archive sizes for
 * Fast Reboot.
 */
static void
save_boot_info(struct xboot_info *xbi)
{
        multiboot_info_t *mbi = xbi->bi_mb_info;
        struct boot_modules *modp;
        int i;

        bcopy(mbi, &saved_mbi, sizeof (multiboot_info_t));
        if (mbi->mmap_length > sizeof (saved_mmap)) {
                DBG_MSG("mbi->mmap_length too big: clearing "
                    "fastreboot_capable\n");
                fastreboot_capable = 0;
        } else {
                bcopy((void *)(uintptr_t)mbi->mmap_addr, (void *)saved_mmap,
                    mbi->mmap_length);
        }

        if ((mbi->flags & MB_INFO_DRIVE_INFO) != 0) {
                if (mbi->drives_length > sizeof (saved_drives)) {
                        DBG(mbi->drives_length);
                        DBG_MSG("mbi->drives_length too big: clearing "
                            "fastreboot_capable\n");
                        fastreboot_capable = 0;
                } else {
                        bcopy((void *)(uintptr_t)mbi->drives_addr,
                            (void *)saved_drives, mbi->drives_length);
                }
        } else {
                saved_mbi.drives_length = 0;
                saved_mbi.drives_addr = NULL;
        }

        /*
         * Current file sizes.  Used by fastboot.c to figure out how much
         * memory to reserve for panic reboot.
         * Use the module list from the dboot-constructed xboot_info
         * instead of the list referenced by the multiboot structure
         * because that structure may not be addressable now.
         */
        saved_file_size[FASTBOOT_NAME_UNIX] = FOUR_MEG - PAGESIZE;
        for (i = 0, modp = (struct boot_modules *)(uintptr_t)xbi->bi_modules;
            i < xbi->bi_module_cnt; i++, modp++) {
                saved_file_size[FASTBOOT_NAME_BOOTARCHIVE] += modp->bm_size;
        }
}
#endif  /* __xpv */


/*
 * 1st pass at building the table of boot properties. This includes:
 * - values set on the command line: -B a=x,b=y,c=z ....
 * - known values we just compute (ie. from xbp)
 * - values from /boot/solaris/bootenv.rc (ie. eeprom(1m) values)
 *
 * the grub command line looked like:
 * kernel boot-file [-B prop=value[,prop=value]...] [boot-args]
 *
 * whoami is the same as boot-file
 */
static void
build_boot_properties(struct xboot_info *xbp)
{
        char *name;
        int name_len;
        char *value;
        int value_len;
        struct boot_modules *bm, *rdbm;
        char *propbuf;
        int quoted = 0;
        int boot_arg_len;
        uint_t i, midx;
        char modid[32];
#ifndef __xpv
        static int stdout_val = 0;
        uchar_t boot_device;
        char str[3];
#endif

        /*
         * These have to be done first, so that kobj_mount_root() works
         */
        DBG_MSG("Building boot properties\n");
        propbuf = do_bsys_alloc(NULL, NULL, MMU_PAGESIZE, 0);
        DBG((uintptr_t)propbuf);
        if (xbp->bi_module_cnt > 0) {
                bm = xbp->bi_modules;
                rdbm = NULL;
                for (midx = i = 0; i < xbp->bi_module_cnt; i++) {
                        if (bm[i].bm_type == BMT_ROOTFS) {
                                rdbm = &bm[i];
                                continue;
                        }
                        if (bm[i].bm_type == BMT_HASH || bm[i].bm_name == NULL)
                                continue;

                        (void) snprintf(modid, sizeof (modid),
                            "module-name-%u", midx);
                        bsetprops(modid, (char *)bm[i].bm_name);
                        (void) snprintf(modid, sizeof (modid),
                            "module-addr-%u", midx);
                        bsetprop64(modid, (uint64_t)(uintptr_t)bm[i].bm_addr);
                        (void) snprintf(modid, sizeof (modid),
                            "module-size-%u", midx);
                        bsetprop64(modid, (uint64_t)bm[i].bm_size);
                        ++midx;
                }
                if (rdbm != NULL) {
                        bsetprop64("ramdisk_start",
                            (uint64_t)(uintptr_t)rdbm->bm_addr);
                        bsetprop64("ramdisk_end",
                            (uint64_t)(uintptr_t)rdbm->bm_addr + rdbm->bm_size);
                }
        }

        /*
         * If there are any boot time modules or hashes present, then disable
         * fast reboot.
         */
        if (xbp->bi_module_cnt > 1) {
                fastreboot_disable(FBNS_BOOTMOD);
        }

#ifndef __xpv
        /*
         * Disable fast reboot if we're using the Multiboot 2 boot protocol,
         * since we don't currently support MB2 info and module relocation.
         * Note that fast reboot will have already been disabled if multiple
         * modules are present, since the current implementation assumes that
         * we only have a single module, the boot_archive.
         */
        if (xbp->bi_mb_version != 1) {
                fastreboot_disable(FBNS_MULTIBOOT2);
        }
#endif

        DBG_MSG("Parsing command line for boot properties\n");
        value = xbp->bi_cmdline;

        /*
         * allocate memory to collect boot_args into
         */
        boot_arg_len = strlen(xbp->bi_cmdline) + 1;
        boot_args = do_bsys_alloc(NULL, NULL, boot_arg_len, MMU_PAGESIZE);
        boot_args[0] = 0;
        boot_arg_len = 0;

#ifdef __xpv
        /*
         * Xen puts a lot of device information in front of the kernel name
         * let's grab them and make them boot properties.  The first
         * string w/o an "=" in it will be the boot-file property.
         */
        (void) strcpy(namebuf, "xpv-");
        for (;;) {
                /*
                 * get to next property
                 */
                while (ISSPACE(*value))
                        ++value;
                name = value;
                /*
                 * look for an "="
                 */
                while (*value && !ISSPACE(*value) && *value != '=') {
                        value++;
                }
                if (*value != '=') { /* no "=" in the property */
                        value = name;
                        break;
                }
                name_len = value - name;
                value_len = 0;
                /*
                 * skip over the "="
                 */
                value++;
                while (value[value_len] && !ISSPACE(value[value_len])) {
                        ++value_len;
                }
                /*
                 * build property name with "xpv-" prefix
                 */
                if (name_len + 4 > 32) { /* skip if name too long */
                        value += value_len;
                        continue;
                }
                bcopy(name, &namebuf[4], name_len);
                name_len += 4;
                namebuf[name_len] = 0;
                bcopy(value, propbuf, value_len);
                propbuf[value_len] = 0;
                bsetprops(namebuf, propbuf);

                /*
                 * xpv-root is set to the logical disk name of the xen
                 * VBD when booting from a disk-based filesystem.
                 */
                if (strcmp(namebuf, "xpv-root") == 0)
                        xen_vbdroot_props(propbuf);
                /*
                 * While we're here, if we have a "xpv-nfsroot" property
                 * then we need to set "fstype" to "nfs" so we mount
                 * our root from the nfs server.  Also parse the xpv-nfsroot
                 * property to create the properties that nfs_mountroot will
                 * need to find the root and mount it.
                 */
                if (strcmp(namebuf, "xpv-nfsroot") == 0)
                        xen_nfsroot_props(propbuf);

                if (strcmp(namebuf, "xpv-ip") == 0)
                        xen_ip_props(propbuf);
                value += value_len;
        }
#endif

        while (ISSPACE(*value))
                ++value;
        /*
         * value now points at the boot-file
         */
        value_len = 0;
        while (value[value_len] && !ISSPACE(value[value_len]))
                ++value_len;
        if (value_len > 0) {
                whoami = propbuf;
                bcopy(value, whoami, value_len);
                whoami[value_len] = 0;
                bsetprops("boot-file", whoami);
                /*
                 * strip leading path stuff from whoami, so running from
                 * PXE/miniroot makes sense.
                 */
                if (strstr(whoami, "/platform/") != NULL)
                        whoami = strstr(whoami, "/platform/");
                bsetprops("whoami", whoami);
        }

        /*
         * Values forcibly set boot properties on the command line via -B.
         * Allow use of quotes in values. Other stuff goes on kernel
         * command line.
         */
        name = value + value_len;
        while (*name != 0) {
                /*
                 * anything not " -B" is copied to the command line
                 */
                if (!ISSPACE(name[0]) || name[1] != '-' || name[2] != 'B') {
                        boot_args[boot_arg_len++] = *name;
                        boot_args[boot_arg_len] = 0;
                        ++name;
                        continue;
                }

                /*
                 * skip the " -B" and following white space
                 */
                name += 3;
                while (ISSPACE(*name))
                        ++name;
                while (*name && !ISSPACE(*name)) {
                        value = strstr(name, "=");
                        if (value == NULL)
                                break;
                        name_len = value - name;
                        ++value;
                        value_len = 0;
                        quoted = 0;
                        for (; ; ++value_len) {
                                if (!value[value_len])
                                        break;

                                /*
                                 * is this value quoted?
                                 */
                                if (value_len == 0 &&
                                    (value[0] == '\'' || value[0] == '"')) {
                                        quoted = value[0];
                                        ++value_len;
                                }

                                /*
                                 * In the quote accept any character,
                                 * but look for ending quote.
                                 */
                                if (quoted) {
                                        if (value[value_len] == quoted)
                                                quoted = 0;
                                        continue;
                                }

                                /*
                                 * a comma or white space ends the value
                                 */
                                if (value[value_len] == ',' ||
                                    ISSPACE(value[value_len]))
                                        break;
                        }

                        if (value_len == 0) {
                                bsetprop(name, name_len, "true", 5);
                        } else {
                                char *v = value;
                                int l = value_len;
                                if (v[0] == v[l - 1] &&
                                    (v[0] == '\'' || v[0] == '"')) {
                                        ++v;
                                        l -= 2;
                                }
                                bcopy(v, propbuf, l);
                                propbuf[l] = '\0';
                                bsetprop(name, name_len, propbuf,
                                    l + 1);
                        }
                        name = value + value_len;
                        while (*name == ',')
                                ++name;
                }
        }

        /*
         * set boot-args property
         * 1275 name is bootargs, so set
         * that too
         */
        bsetprops("boot-args", boot_args);
        bsetprops("bootargs", boot_args);

#ifndef __xpv
        /*
         * Build boot command line for Fast Reboot
         */
        build_fastboot_cmdline(xbp);

        if (xbp->bi_mb_version == 1) {
                multiboot_info_t *mbi = xbp->bi_mb_info;
                int netboot;
                struct sol_netinfo *sip;

                /*
                 * set the BIOS boot device from GRUB
                 */
                netboot = 0;

                /*
                 * Save various boot information for Fast Reboot
                 */
                save_boot_info(xbp);

                if (mbi != NULL && mbi->flags & MB_INFO_BOOTDEV) {
                        boot_device = mbi->boot_device >> 24;
                        if (boot_device == 0x20)
                                netboot++;
                        str[0] = (boot_device >> 4) + '0';
                        str[1] = (boot_device & 0xf) + '0';
                        str[2] = 0;
                        bsetprops("bios-boot-device", str);
                } else {
                        netboot = 1;
                }

                /*
                 * In the netboot case, drives_info is overloaded with the
                 * dhcp ack. This is not multiboot compliant and requires
                 * special pxegrub!
                 */
                if (netboot && mbi->drives_length != 0) {
                        sip = (struct sol_netinfo *)(uintptr_t)mbi->drives_addr;
                        if (sip->sn_infotype == SN_TYPE_BOOTP)
                                bsetprop("bootp-response",
                                    sizeof ("bootp-response"),
                                    (void *)(uintptr_t)mbi->drives_addr,
                                    mbi->drives_length);
                        else if (sip->sn_infotype == SN_TYPE_RARP)
                                setup_rarp_props(sip);
                }
        } else {
                multiboot2_info_header_t *mbi = xbp->bi_mb_info;
                multiboot_tag_bootdev_t *bootdev = NULL;
                multiboot_tag_network_t *netdev = NULL;

                if (mbi != NULL) {
                        bootdev = dboot_multiboot2_find_tag(mbi,
                            MULTIBOOT_TAG_TYPE_BOOTDEV);
                        netdev = dboot_multiboot2_find_tag(mbi,
                            MULTIBOOT_TAG_TYPE_NETWORK);
                }
                if (bootdev != NULL) {
                        DBG(bootdev->mb_biosdev);
                        boot_device = bootdev->mb_biosdev;
                        str[0] = (boot_device >> 4) + '0';
                        str[1] = (boot_device & 0xf) + '0';
                        str[2] = 0;
                        bsetprops("bios-boot-device", str);
                }
                if (netdev != NULL) {
                        bsetprop("bootp-response", sizeof ("bootp-response"),
                            (void *)(uintptr_t)netdev->mb_dhcpack,
                            netdev->mb_size -
                            sizeof (multiboot_tag_network_t));
                }
        }

        bsetprop("stdout", strlen("stdout"),
            &stdout_val, sizeof (stdout_val));
#endif /* __xpv */

        /*
         * more conjured up values for made up things....
         */
#if defined(__xpv)
        bsetprops("mfg-name", "i86xpv");
        bsetprops("impl-arch-name", "i86xpv");
#else
        bsetprops("mfg-name", "i86pc");
        bsetprops("impl-arch-name", "i86pc");
#endif

        /*
         * Build firmware-provided system properties
         */
        build_firmware_properties(xbp);

        /*
         * XXPV
         *
         * Find out what these are:
         * - cpuid_feature_ecx_include
         * - cpuid_feature_ecx_exclude
         * - cpuid_feature_edx_include
         * - cpuid_feature_edx_exclude
         *
         * Find out what these are in multiboot:
         * - netdev-path
         * - fstype
         */
}

#ifdef __xpv
/*
 * Under the Hypervisor, memory usable for DMA may be scarce. One
 * very likely large pool of DMA friendly memory is occupied by
 * the boot_archive, as it was loaded by grub into low MFNs.
 *
 * Here we free up that memory by copying the boot archive to what are
 * likely higher MFN pages and then swapping the mfn/pfn mappings.
 */
#define PFN_2GIG        0x80000
static void
relocate_boot_archive(struct xboot_info *xbp)
{
        mfn_t max_mfn = HYPERVISOR_memory_op(XENMEM_maximum_ram_page, NULL);
        struct boot_modules *bm = xbp->bi_modules;
        uintptr_t va;
        pfn_t va_pfn;
        mfn_t va_mfn;
        caddr_t copy;
        pfn_t copy_pfn;
        mfn_t copy_mfn;
        size_t  len;
        int slop;
        int total = 0;
        int relocated = 0;
        int mmu_update_return;
        mmu_update_t t[2];
        x86pte_t pte;

        /*
         * If all MFN's are below 2Gig, don't bother doing this.
         */
        if (max_mfn < PFN_2GIG)
                return;
        if (xbp->bi_module_cnt < 1) {
                DBG_MSG("no boot_archive!");
                return;
        }

        DBG_MSG("moving boot_archive to high MFN memory\n");
        va = (uintptr_t)bm->bm_addr;
        len = bm->bm_size;
        slop = va & MMU_PAGEOFFSET;
        if (slop) {
                va += MMU_PAGESIZE - slop;
                len -= MMU_PAGESIZE - slop;
        }
        len = P2ALIGN(len, MMU_PAGESIZE);

        /*
         * Go through all boot_archive pages, swapping any low MFN pages
         * with memory at next_phys.
         */
        while (len != 0) {
                ++total;
                va_pfn = mmu_btop(va - ONE_GIG);
                va_mfn = mfn_list[va_pfn];
                if (mfn_list[va_pfn] < PFN_2GIG) {
                        copy = kbm_remap_window(next_phys, 1);
                        bcopy((void *)va, copy, MMU_PAGESIZE);
                        copy_pfn = mmu_btop(next_phys);
                        copy_mfn = mfn_list[copy_pfn];

                        pte = mfn_to_ma(copy_mfn) | PT_NOCONSIST | PT_VALID;
                        if (HYPERVISOR_update_va_mapping(va, pte,
                            UVMF_INVLPG | UVMF_LOCAL))
                                bop_panic("relocate_boot_archive():  "
                                    "HYPERVISOR_update_va_mapping() failed");

                        mfn_list[va_pfn] = copy_mfn;
                        mfn_list[copy_pfn] = va_mfn;

                        t[0].ptr = mfn_to_ma(copy_mfn) | MMU_MACHPHYS_UPDATE;
                        t[0].val = va_pfn;
                        t[1].ptr = mfn_to_ma(va_mfn) | MMU_MACHPHYS_UPDATE;
                        t[1].val = copy_pfn;
                        if (HYPERVISOR_mmu_update(t, 2, &mmu_update_return,
                            DOMID_SELF) != 0 || mmu_update_return != 2)
                                bop_panic("relocate_boot_archive():  "
                                    "HYPERVISOR_mmu_update() failed");

                        next_phys += MMU_PAGESIZE;
                        ++relocated;
                }
                len -= MMU_PAGESIZE;
                va += MMU_PAGESIZE;
        }
        DBG_MSG("Relocated pages:\n");
        DBG(relocated);
        DBG_MSG("Out of total pages:\n");
        DBG(total);
}
#endif /* __xpv */

#if !defined(__xpv)
/*
 * Install a temporary IDT that lets us catch errors in the boot time code.
 * We shouldn't get any faults at all while this is installed, so we'll
 * just generate a traceback and exit.
 */
#ifdef __amd64
static const int bcode_sel = B64CODE_SEL;
#else
static const int bcode_sel = B32CODE_SEL;
#endif

/*
 * simple description of a stack frame (args are 32 bit only currently)
 */
typedef struct bop_frame {
        struct bop_frame *old_frame;
        pc_t retaddr;
        long arg[1];
} bop_frame_t;

void
bop_traceback(bop_frame_t *frame)
{
        pc_t pc;
        int cnt;
        char *ksym;
        ulong_t off;
#if defined(__i386)
        int a;
#endif

        bop_printf(NULL, "Stack traceback:\n");
        for (cnt = 0; cnt < 30; ++cnt) {        /* up to 30 frames */
                pc = frame->retaddr;
                if (pc == 0)
                        break;
                ksym = kobj_getsymname(pc, &off);
                if (ksym)
                        bop_printf(NULL, "  %s+%lx", ksym, off);
                else
                        bop_printf(NULL, "  0x%lx", pc);

                frame = frame->old_frame;
                if (frame == 0) {
                        bop_printf(NULL, "\n");
                        break;
                }
#if defined(__i386)
                for (a = 0; a < 6; ++a) {       /* try for 6 args */
                        if ((void *)&frame->arg[a] == (void *)frame->old_frame)
                                break;
                        if (a == 0)
                                bop_printf(NULL, "(");
                        else
                                bop_printf(NULL, ",");
                        bop_printf(NULL, "0x%lx", frame->arg[a]);
                }
                bop_printf(NULL, ")");
#endif
                bop_printf(NULL, "\n");
        }
}

struct trapframe {
        ulong_t error_code;     /* optional */
        ulong_t inst_ptr;
        ulong_t code_seg;
        ulong_t flags_reg;
#ifdef __amd64
        ulong_t stk_ptr;
        ulong_t stk_seg;
#endif
};

void
bop_trap(ulong_t *tfp)
{
        struct trapframe *tf = (struct trapframe *)tfp;
        bop_frame_t fakeframe;
        static int depth = 0;

        /*
         * Check for an infinite loop of traps.
         */
        if (++depth > 2)
                bop_panic("Nested trap");

        bop_printf(NULL, "Unexpected trap\n");

        /*
         * adjust the tf for optional error_code by detecting the code selector
         */
        if (tf->code_seg != bcode_sel)
                tf = (struct trapframe *)(tfp - 1);
        else
                bop_printf(NULL, "error code           0x%lx\n",
                    tf->error_code & 0xffffffff);

        bop_printf(NULL, "instruction pointer  0x%lx\n", tf->inst_ptr);
        bop_printf(NULL, "code segment         0x%lx\n", tf->code_seg & 0xffff);
        bop_printf(NULL, "flags register       0x%lx\n", tf->flags_reg);
#ifdef __amd64
        bop_printf(NULL, "return %%rsp          0x%lx\n", tf->stk_ptr);
        bop_printf(NULL, "return %%ss           0x%lx\n", tf->stk_seg & 0xffff);
#endif

        /* grab %[er]bp pushed by our code from the stack */
        fakeframe.old_frame = (bop_frame_t *)*(tfp - 3);
        fakeframe.retaddr = (pc_t)tf->inst_ptr;
        bop_printf(NULL, "Attempting stack backtrace:\n");
        bop_traceback(&fakeframe);
        bop_panic("unexpected trap in early boot");
}

extern void bop_trap_handler(void);

static gate_desc_t *bop_idt;

static desctbr_t bop_idt_info;

static void
bop_idt_init(void)
{
        int t;

        bop_idt = (gate_desc_t *)
            do_bsys_alloc(NULL, NULL, MMU_PAGESIZE, MMU_PAGESIZE);
        bzero(bop_idt, MMU_PAGESIZE);
        for (t = 0; t < NIDT; ++t) {
                /*
                 * Note that since boot runs without a TSS, the
                 * double fault handler cannot use an alternate stack
                 * (64-bit) or a task gate (32-bit).
                 */
                set_gatesegd(&bop_idt[t], &bop_trap_handler, bcode_sel,
                    SDT_SYSIGT, TRP_KPL, 0);
        }
        bop_idt_info.dtr_limit = (NIDT * sizeof (gate_desc_t)) - 1;
        bop_idt_info.dtr_base = (uintptr_t)bop_idt;
        wr_idtr(&bop_idt_info);
}
#endif  /* !defined(__xpv) */

/*
 * This is where we enter the kernel. It dummies up the boot_ops and
 * boot_syscalls vectors and jumps off to _kobj_boot()
 */
void
_start(struct xboot_info *xbp)
{
        bootops_t *bops = &bootop;
        extern void _kobj_boot();

        /*
         * 1st off - initialize the console for any error messages
         */
        xbootp = xbp;
#ifdef __xpv
        HYPERVISOR_shared_info = (void *)xbp->bi_shared_info;
        xen_info = xbp->bi_xen_start_info;
#endif

#ifndef __xpv
        if (*((uint32_t *)(FASTBOOT_SWTCH_PA + FASTBOOT_STACK_OFFSET)) ==
            FASTBOOT_MAGIC) {
                post_fastreboot = 1;
                *((uint32_t *)(FASTBOOT_SWTCH_PA + FASTBOOT_STACK_OFFSET)) = 0;
        }
#endif

        bcons_init((void *)xbp->bi_cmdline);
        have_console = 1;

        /*
         * enable debugging
         */
        if (strstr((char *)xbp->bi_cmdline, "kbm_debug"))
                kbm_debug = 1;

        DBG_MSG("\n\n*** Entered Solaris in _start() cmdline is: ");
        DBG_MSG((char *)xbp->bi_cmdline);
        DBG_MSG("\n\n\n");

        /*
         * physavail is no longer used by startup
         */
        bm.physinstalled = xbp->bi_phys_install;
        bm.pcimem = xbp->bi_pcimem;
        bm.rsvdmem = xbp->bi_rsvdmem;
        bm.physavail = NULL;

        /*
         * initialize the boot time allocator
         */
        next_phys = xbp->bi_next_paddr;
        DBG(next_phys);
        next_virt = (uintptr_t)xbp->bi_next_vaddr;
        DBG(next_virt);
        DBG_MSG("Initializing boot time memory management...");
#ifdef __xpv
        {
                xen_platform_parameters_t p;

                /* This call shouldn't fail, dboot already did it once. */
                (void) HYPERVISOR_xen_version(XENVER_platform_parameters, &p);
                mfn_to_pfn_mapping = (pfn_t *)(xen_virt_start = p.virt_start);
                DBG(xen_virt_start);
        }
#endif
        kbm_init(xbp);
        DBG_MSG("done\n");

        /*
         * Fill in the bootops vector
         */
        bops->bsys_version = BO_VERSION;
        bops->boot_mem = &bm;
        bops->bsys_alloc = do_bsys_alloc;
        bops->bsys_free = do_bsys_free;
        bops->bsys_getproplen = do_bsys_getproplen;
        bops->bsys_getprop = do_bsys_getprop;
        bops->bsys_nextprop = do_bsys_nextprop;
        bops->bsys_printf = bop_printf;
        bops->bsys_doint = do_bsys_doint;

        /*
         * BOP_EALLOC() is no longer needed
         */
        bops->bsys_ealloc = do_bsys_ealloc;

#ifdef __xpv
        /*
         * On domain 0 we need to free up some physical memory that is
         * usable for DMA. Since GRUB loaded the boot_archive, it is
         * sitting in low MFN memory. We'll relocated the boot archive
         * pages to high PFN memory.
         */
        if (DOMAIN_IS_INITDOMAIN(xen_info))
                relocate_boot_archive(xbp);
#endif

#ifndef __xpv
        /*
         * Install an IDT to catch early pagefaults (shouldn't have any).
         * Also needed for kmdb.
         */
        bop_idt_init();
#endif

        /*
         * Start building the boot properties from the command line
         */
        DBG_MSG("Initializing boot properties:\n");
        build_boot_properties(xbp);

        if (strstr((char *)xbp->bi_cmdline, "prom_debug") || kbm_debug) {
                char *value;

                value = do_bsys_alloc(NULL, NULL, MMU_PAGESIZE, MMU_PAGESIZE);
                boot_prop_display(value);
        }

        /*
         * jump into krtld...
         */
        _kobj_boot(&bop_sysp, NULL, bops, NULL);
}


/*ARGSUSED*/
static caddr_t
no_more_alloc(bootops_t *bop, caddr_t virthint, size_t size, int align)
{
        panic("Attempt to bsys_alloc() too late\n");
        return (NULL);
}

/*ARGSUSED*/
static void
no_more_free(bootops_t *bop, caddr_t virt, size_t size)
{
        panic("Attempt to bsys_free() too late\n");
}

void
bop_no_more_mem(void)
{
        DBG(total_bop_alloc_scratch);
        DBG(total_bop_alloc_kernel);
        bootops->bsys_alloc = no_more_alloc;
        bootops->bsys_free = no_more_free;
}


/*
 * Set ACPI firmware properties
 */

static caddr_t
vmap_phys(size_t length, paddr_t pa)
{
        paddr_t start, end;
        caddr_t va;
        size_t  len, page;

#ifdef __xpv
        pa = pfn_to_pa(xen_assign_pfn(mmu_btop(pa))) | (pa & MMU_PAGEOFFSET);
#endif
        start = P2ALIGN(pa, MMU_PAGESIZE);
        end = P2ROUNDUP(pa + length, MMU_PAGESIZE);
        len = end - start;
        va = (caddr_t)alloc_vaddr(len, MMU_PAGESIZE);
        for (page = 0; page < len; page += MMU_PAGESIZE)
                kbm_map((uintptr_t)va + page, start + page, 0, 0);
        return (va + (pa & MMU_PAGEOFFSET));
}

static uint8_t
checksum_table(uint8_t *tp, size_t len)
{
        uint8_t sum = 0;

        while (len-- > 0)
                sum += *tp++;

        return (sum);
}

static int
valid_rsdp(ACPI_TABLE_RSDP *rp)
{

        /* validate the V1.x checksum */
        if (checksum_table((uint8_t *)rp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
                return (0);

        /* If pre-ACPI 2.0, this is a valid RSDP */
        if (rp->Revision < 2)
                return (1);

        /* validate the V2.x checksum */
        if (checksum_table((uint8_t *)rp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)
                return (0);

        return (1);
}

/*
 * Scan memory range for an RSDP;
 * see ACPI 3.0 Spec, 5.2.5.1
 */
static ACPI_TABLE_RSDP *
scan_rsdp(paddr_t start, paddr_t end)
{
        ssize_t len  = end - start;
        caddr_t ptr;

        ptr = vmap_phys(len, start);
        while (len > 0) {
                if (strncmp(ptr, ACPI_SIG_RSDP, strlen(ACPI_SIG_RSDP)) == 0 &&
                    valid_rsdp((ACPI_TABLE_RSDP *)ptr))
                        return ((ACPI_TABLE_RSDP *)ptr);

                ptr += ACPI_RSDP_SCAN_STEP;
                len -= ACPI_RSDP_SCAN_STEP;
        }

        return (NULL);
}

/*
 * Refer to ACPI 3.0 Spec, section 5.2.5.1 to understand this function
 */
static ACPI_TABLE_RSDP *
find_rsdp()
{
        ACPI_TABLE_RSDP *rsdp;
        uint64_t rsdp_val = 0;
        uint16_t *ebda_seg;
        paddr_t  ebda_addr;

        /* check for "acpi-root-tab" property */
        if (do_bsys_getproplen(NULL, "acpi-root-tab") == sizeof (uint64_t)) {
                (void) do_bsys_getprop(NULL, "acpi-root-tab", &rsdp_val);
                if (rsdp_val != 0) {
                        rsdp = scan_rsdp(rsdp_val, rsdp_val + sizeof (*rsdp));
                        if (rsdp != NULL) {
                                if (kbm_debug) {
                                        bop_printf(NULL,
                                            "Using RSDP from bootloader: "
                                            "0x%p\n", (void *)rsdp);
                                }
                                return (rsdp);
                        }
                }
        }

        /*
         * Get the EBDA segment and scan the first 1K
         */
        ebda_seg = (uint16_t *)vmap_phys(sizeof (uint16_t),
            ACPI_EBDA_PTR_LOCATION);
        ebda_addr = *ebda_seg << 4;
        rsdp = scan_rsdp(ebda_addr, ebda_addr + ACPI_EBDA_WINDOW_SIZE);
        if (rsdp == NULL)
                /* if EBDA doesn't contain RSDP, look in BIOS memory */
                rsdp = scan_rsdp(ACPI_HI_RSDP_WINDOW_BASE,
                    ACPI_HI_RSDP_WINDOW_BASE + ACPI_HI_RSDP_WINDOW_SIZE);
        return (rsdp);
}

static ACPI_TABLE_HEADER *
map_fw_table(paddr_t table_addr)
{
        ACPI_TABLE_HEADER *tp;
        size_t len = MAX(sizeof (*tp), MMU_PAGESIZE);

        /*
         * Map at least a page; if the table is larger than this, remap it
         */
        tp = (ACPI_TABLE_HEADER *)vmap_phys(len, table_addr);
        if (tp->Length > len)
                tp = (ACPI_TABLE_HEADER *)vmap_phys(tp->Length, table_addr);
        return (tp);
}

static ACPI_TABLE_HEADER *
find_fw_table(char *signature)
{
        static int revision = 0;
        static ACPI_TABLE_XSDT *xsdt;
        static int len;
        paddr_t xsdt_addr;
        ACPI_TABLE_RSDP *rsdp;
        ACPI_TABLE_HEADER *tp;
        paddr_t table_addr;
        int     n;

        if (strlen(signature) != ACPI_NAME_SIZE)
                return (NULL);

        /*
         * Reading the ACPI 3.0 Spec, section 5.2.5.3 will help
         * understand this code.  If we haven't already found the RSDT/XSDT,
         * revision will be 0. Find the RSDP and check the revision
         * to find out whether to use the RSDT or XSDT.  If revision is
         * 0 or 1, use the RSDT and set internal revision to 1; if it is 2,
         * use the XSDT.  If the XSDT address is 0, though, fall back to
         * revision 1 and use the RSDT.
         */
        if (revision == 0) {
                if ((rsdp = find_rsdp()) != NULL) {
                        revision = rsdp->Revision;
                        /*
                         * ACPI 6.0 states that current revision is 2
                         * from acpi_table_rsdp definition:
                         * Must be (0) for ACPI 1.0 or (2) for ACPI 2.0+
                         */
                        if (revision > 2)
                                revision = 2;
                        switch (revision) {
                        case 2:
                                /*
                                 * Use the XSDT unless BIOS is buggy and
                                 * claims to be rev 2 but has a null XSDT
                                 * address
                                 */
                                xsdt_addr = rsdp->XsdtPhysicalAddress;
                                if (xsdt_addr != 0)
                                        break;
                                /* FALLTHROUGH */
                        case 0:
                                /* treat RSDP rev 0 as revision 1 internally */
                                revision = 1;
                                /* FALLTHROUGH */
                        case 1:
                                /* use the RSDT for rev 0/1 */
                                xsdt_addr = rsdp->RsdtPhysicalAddress;
                                break;
                        default:
                                /* unknown revision */
                                revision = 0;
                                break;
                        }
                }
                if (revision == 0)
                        return (NULL);

                /* cache the XSDT info */
                xsdt = (ACPI_TABLE_XSDT *)map_fw_table(xsdt_addr);
                len = (xsdt->Header.Length - sizeof (xsdt->Header)) /
                    ((revision == 1) ? sizeof (uint32_t) : sizeof (uint64_t));
        }

        /*
         * Scan the table headers looking for a signature match
         */
        for (n = 0; n < len; n++) {
                ACPI_TABLE_RSDT *rsdt = (ACPI_TABLE_RSDT *)xsdt;
                table_addr = (revision == 1) ? rsdt->TableOffsetEntry[n] :
                    xsdt->TableOffsetEntry[n];

                if (table_addr == 0)
                        continue;
                tp = map_fw_table(table_addr);
                if (strncmp(tp->Signature, signature, ACPI_NAME_SIZE) == 0) {
                        return (tp);
                }
        }
        return (NULL);
}

static void
process_mcfg(ACPI_TABLE_MCFG *tp)
{
        ACPI_MCFG_ALLOCATION *cfg_baap;
        char *cfg_baa_endp;
        int64_t ecfginfo[4];

        cfg_baap = (ACPI_MCFG_ALLOCATION *)((uintptr_t)tp + sizeof (*tp));
        cfg_baa_endp = ((char *)tp) + tp->Header.Length;
        while ((char *)cfg_baap < cfg_baa_endp) {
                if (cfg_baap->Address != 0 && cfg_baap->PciSegment == 0) {
                        ecfginfo[0] = cfg_baap->Address;
                        ecfginfo[1] = cfg_baap->PciSegment;
                        ecfginfo[2] = cfg_baap->StartBusNumber;
                        ecfginfo[3] = cfg_baap->EndBusNumber;
                        bsetprop(MCFG_PROPNAME, strlen(MCFG_PROPNAME),
                            ecfginfo, sizeof (ecfginfo));
                        break;
                }
                cfg_baap++;
        }
}

#ifndef __xpv
static void
process_madt_entries(ACPI_TABLE_MADT *tp, uint32_t *cpu_countp,
    uint32_t *cpu_possible_countp, uint32_t *cpu_apicid_array)
{
        ACPI_SUBTABLE_HEADER *item, *end;
        uint32_t cpu_count = 0;
        uint32_t cpu_possible_count = 0;

        /*
         * Determine number of CPUs and keep track of "final" APIC ID
         * for each CPU by walking through ACPI MADT processor list
         */
        end = (ACPI_SUBTABLE_HEADER *)(tp->Header.Length + (uintptr_t)tp);
        item = (ACPI_SUBTABLE_HEADER *)((uintptr_t)tp + sizeof (*tp));

        while (item < end) {
                switch (item->Type) {
                case ACPI_MADT_TYPE_LOCAL_APIC: {
                        ACPI_MADT_LOCAL_APIC *cpu =
                            (ACPI_MADT_LOCAL_APIC *) item;

                        if (cpu->LapicFlags & ACPI_MADT_ENABLED) {
                                if (cpu_apicid_array != NULL)
                                        cpu_apicid_array[cpu_count] = cpu->Id;
                                cpu_count++;
                        }
                        cpu_possible_count++;
                        break;
                }
                case ACPI_MADT_TYPE_LOCAL_X2APIC: {
                        ACPI_MADT_LOCAL_X2APIC *cpu =
                            (ACPI_MADT_LOCAL_X2APIC *) item;

                        if (cpu->LapicFlags & ACPI_MADT_ENABLED) {
                                if (cpu_apicid_array != NULL)
                                        cpu_apicid_array[cpu_count] =
                                            cpu->LocalApicId;
                                cpu_count++;
                        }
                        cpu_possible_count++;
                        break;
                }
                default:
                        if (kbm_debug)
                                bop_printf(NULL, "MADT type %d\n", item->Type);
                        break;
                }

                item = (ACPI_SUBTABLE_HEADER *)((uintptr_t)item + item->Length);
        }
        if (cpu_countp)
                *cpu_countp = cpu_count;
        if (cpu_possible_countp)
                *cpu_possible_countp = cpu_possible_count;
}

static void
process_madt(ACPI_TABLE_MADT *tp)
{
        uint32_t cpu_count = 0;
        uint32_t cpu_possible_count = 0;
        uint32_t *cpu_apicid_array; /* x2APIC ID is 32bit! */

        if (tp != NULL) {
                /* count cpu's */
                process_madt_entries(tp, &cpu_count, &cpu_possible_count, NULL);

                cpu_apicid_array = (uint32_t *)do_bsys_alloc(NULL, NULL,
                    cpu_count * sizeof (*cpu_apicid_array), MMU_PAGESIZE);
                if (cpu_apicid_array == NULL)
                        bop_panic("Not enough memory for APIC ID array");

                /* copy IDs */
                process_madt_entries(tp, NULL, NULL, cpu_apicid_array);

                /*
                 * Make boot property for array of "final" APIC IDs for each
                 * CPU
                 */
                bsetprop(BP_CPU_APICID_ARRAY, strlen(BP_CPU_APICID_ARRAY),
                    cpu_apicid_array, cpu_count * sizeof (*cpu_apicid_array));
        }

        /*
         * Check whether property plat-max-ncpus is already set.
         */
        if (do_bsys_getproplen(NULL, PLAT_MAX_NCPUS_NAME) < 0) {
                /*
                 * Set plat-max-ncpus to number of maximum possible CPUs given
                 * in MADT if it hasn't been set.
                 * There's no formal way to detect max possible CPUs supported
                 * by platform according to ACPI spec3.0b. So current CPU
                 * hotplug implementation expects that all possible CPUs will
                 * have an entry in MADT table and set plat-max-ncpus to number
                 * of entries in MADT.
                 * With introducing of ACPI4.0, Maximum System Capability Table
                 * (MSCT) provides maximum number of CPUs supported by platform.
                 * If MSCT is unavailable, fall back to old way.
                 */
                if (tp != NULL)
                        bsetpropsi(PLAT_MAX_NCPUS_NAME, cpu_possible_count);
        }

        /*
         * Set boot property boot-max-ncpus to number of CPUs existing at
         * boot time. boot-max-ncpus is mainly used for optimization.
         */
        if (tp != NULL)
                bsetpropsi(BOOT_MAX_NCPUS_NAME, cpu_count);

        /*
         * User-set boot-ncpus overrides firmware count
         */
        if (do_bsys_getproplen(NULL, BOOT_NCPUS_NAME) >= 0)
                return;

        /*
         * Set boot property boot-ncpus to number of active CPUs given in MADT
         * if it hasn't been set yet.
         */
        if (tp != NULL)
                bsetpropsi(BOOT_NCPUS_NAME, cpu_count);
}

static void
process_srat(ACPI_TABLE_SRAT *tp)
{
        ACPI_SUBTABLE_HEADER *item, *end;
        int i;
        int proc_num, mem_num;
#pragma pack(1)
        struct {
                uint32_t domain;
                uint32_t apic_id;
                uint32_t sapic_id;
        } processor;
        struct {
                uint32_t domain;
                uint32_t x2apic_id;
        } x2apic;
        struct {
                uint32_t domain;
                uint64_t addr;
                uint64_t length;
                uint32_t flags;
        } memory;
#pragma pack()
        char prop_name[30];
        uint64_t maxmem = 0;

        if (tp == NULL)
                return;

        proc_num = mem_num = 0;
        end = (ACPI_SUBTABLE_HEADER *)(tp->Header.Length + (uintptr_t)tp);
        item = (ACPI_SUBTABLE_HEADER *)((uintptr_t)tp + sizeof (*tp));
        while (item < end) {
                switch (item->Type) {
                case ACPI_SRAT_TYPE_CPU_AFFINITY: {
                        ACPI_SRAT_CPU_AFFINITY *cpu =
                            (ACPI_SRAT_CPU_AFFINITY *) item;

                        if (!(cpu->Flags & ACPI_SRAT_CPU_ENABLED))
                                break;
                        processor.domain = cpu->ProximityDomainLo;
                        for (i = 0; i < 3; i++)
                                processor.domain +=
                                    cpu->ProximityDomainHi[i] << ((i + 1) * 8);
                        processor.apic_id = cpu->ApicId;
                        processor.sapic_id = cpu->LocalSapicEid;
                        (void) snprintf(prop_name, 30, "acpi-srat-processor-%d",
                            proc_num);
                        bsetprop(prop_name, strlen(prop_name), &processor,
                            sizeof (processor));
                        proc_num++;
                        break;
                }
                case ACPI_SRAT_TYPE_MEMORY_AFFINITY: {
                        ACPI_SRAT_MEM_AFFINITY *mem =
                            (ACPI_SRAT_MEM_AFFINITY *)item;

                        if (!(mem->Flags & ACPI_SRAT_MEM_ENABLED))
                                break;
                        memory.domain = mem->ProximityDomain;
                        memory.addr = mem->BaseAddress;
                        memory.length = mem->Length;
                        memory.flags = mem->Flags;
                        (void) snprintf(prop_name, 30, "acpi-srat-memory-%d",
                            mem_num);
                        bsetprop(prop_name, strlen(prop_name), &memory,
                            sizeof (memory));
                        if ((mem->Flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) &&
                            (memory.addr + memory.length > maxmem)) {
                                maxmem = memory.addr + memory.length;
                        }
                        mem_num++;
                        break;
                }
                case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: {
                        ACPI_SRAT_X2APIC_CPU_AFFINITY *x2cpu =
                            (ACPI_SRAT_X2APIC_CPU_AFFINITY *) item;

                        if (!(x2cpu->Flags & ACPI_SRAT_CPU_ENABLED))
                                break;
                        x2apic.domain = x2cpu->ProximityDomain;
                        x2apic.x2apic_id = x2cpu->ApicId;
                        (void) snprintf(prop_name, 30, "acpi-srat-processor-%d",
                            proc_num);
                        bsetprop(prop_name, strlen(prop_name), &x2apic,
                            sizeof (x2apic));
                        proc_num++;
                        break;
                }
                default:
                        if (kbm_debug)
                                bop_printf(NULL, "SRAT type %d\n", item->Type);
                        break;
                }

                item = (ACPI_SUBTABLE_HEADER *)
                    (item->Length + (uintptr_t)item);
        }

        /*
         * The maximum physical address calculated from the SRAT table is more
         * accurate than that calculated from the MSCT table.
         */
        if (maxmem != 0) {
                plat_dr_physmax = btop(maxmem);
        }
}

static void
process_slit(ACPI_TABLE_SLIT *tp)
{

        /*
         * Check the number of localities; if it's too huge, we just
         * return and locality enumeration code will handle this later,
         * if possible.
         *
         * Note that the size of the table is the square of the
         * number of localities; if the number of localities exceeds
         * UINT16_MAX, the table size may overflow an int when being
         * passed to bsetprop() below.
         */
        if (tp->LocalityCount >= SLIT_LOCALITIES_MAX)
                return;

        bsetprop(SLIT_NUM_PROPNAME, strlen(SLIT_NUM_PROPNAME),
            &tp->LocalityCount, sizeof (tp->LocalityCount));
        bsetprop(SLIT_PROPNAME, strlen(SLIT_PROPNAME), &tp->Entry,
            tp->LocalityCount * tp->LocalityCount);
}

static ACPI_TABLE_MSCT *
process_msct(ACPI_TABLE_MSCT *tp)
{
        int last_seen = 0;
        int proc_num = 0;
        ACPI_MSCT_PROXIMITY *item, *end;
        extern uint64_t plat_dr_options;

        ASSERT(tp != NULL);

        end = (ACPI_MSCT_PROXIMITY *)(tp->Header.Length + (uintptr_t)tp);
        for (item = (void *)((uintptr_t)tp + tp->ProximityOffset);
            item < end;
            item = (void *)(item->Length + (uintptr_t)item)) {
                /*
                 * Sanity check according to section 5.2.19.1 of ACPI 4.0.
                 * Revision     1
                 * Length       22
                 */
                if (item->Revision != 1 || item->Length != 22) {
                        cmn_err(CE_CONT,
                            "?boot: unknown proximity domain structure in MSCT "
                            "with Revision(%d), Length(%d).\n",
                            (int)item->Revision, (int)item->Length);
                        return (NULL);
                } else if (item->RangeStart > item->RangeEnd) {
                        cmn_err(CE_CONT,
                            "?boot: invalid proximity domain structure in MSCT "
                            "with RangeStart(%u), RangeEnd(%u).\n",
                            item->RangeStart, item->RangeEnd);
                        return (NULL);
                } else if (item->RangeStart != last_seen) {
                        /*
                         * Items must be organized in ascending order of the
                         * proximity domain enumerations.
                         */
                        cmn_err(CE_CONT,
                            "?boot: invalid proximity domain structure in MSCT,"
                            " items are not orginized in ascending order.\n");
                        return (NULL);
                }

                /*
                 * If ProcessorCapacity is 0 then there would be no CPUs in this
                 * domain.
                 */
                if (item->ProcessorCapacity != 0) {
                        proc_num += (item->RangeEnd - item->RangeStart + 1) *
                            item->ProcessorCapacity;
                }

                last_seen = item->RangeEnd - item->RangeStart + 1;
                /*
                 * Break out if all proximity domains have been processed.
                 * Some BIOSes may have unused items at the end of MSCT table.
                 */
                if (last_seen > tp->MaxProximityDomains) {
                        break;
                }
        }
        if (last_seen != tp->MaxProximityDomains + 1) {
                cmn_err(CE_CONT,
                    "?boot: invalid proximity domain structure in MSCT, "
                    "proximity domain count doesn't match.\n");
                return (NULL);
        }

        /*
         * Set plat-max-ncpus property if it hasn't been set yet.
         */
        if (do_bsys_getproplen(NULL, PLAT_MAX_NCPUS_NAME) < 0) {
                if (proc_num != 0) {
                        bsetpropsi(PLAT_MAX_NCPUS_NAME, proc_num);
                }
        }

        /*
         * Use Maximum Physical Address from the MSCT table as upper limit for
         * memory hot-adding by default. It may be overridden by value from
         * the SRAT table or the "plat-dr-physmax" boot option.
         */
        plat_dr_physmax = btop(tp->MaxAddress + 1);

        /*
         * Existence of MSCT implies CPU/memory hotplug-capability for the
         * platform.
         */
        plat_dr_options |= PLAT_DR_FEATURE_CPU;
        plat_dr_options |= PLAT_DR_FEATURE_MEMORY;

        return (tp);
}

#else /* __xpv */
static void
enumerate_xen_cpus()
{
        processorid_t   id, max_id;

        /*
         * User-set boot-ncpus overrides enumeration
         */
        if (do_bsys_getproplen(NULL, BOOT_NCPUS_NAME) >= 0)
                return;

        /*
         * Probe every possible virtual CPU id and remember the
         * highest id present; the count of CPUs is one greater
         * than this.  This tacitly assumes at least cpu 0 is present.
         */
        max_id = 0;
        for (id = 0; id < MAX_VIRT_CPUS; id++)
                if (HYPERVISOR_vcpu_op(VCPUOP_is_up, id, NULL) == 0)
                        max_id = id;

        bsetpropsi(BOOT_NCPUS_NAME, max_id+1);

}
#endif /* __xpv */

/*ARGSUSED*/
static void
build_firmware_properties(struct xboot_info *xbp)
{
        ACPI_TABLE_HEADER *tp = NULL;

#ifndef __xpv
        if (xbp->bi_acpi_rsdp) {
                bsetprop64("acpi-root-tab",
                    (uint64_t)(uintptr_t)xbp->bi_acpi_rsdp);
        }

        if ((tp = find_fw_table(ACPI_SIG_MSCT)) != NULL)
                msct_ptr = process_msct((ACPI_TABLE_MSCT *)tp);
        else
                msct_ptr = NULL;

        if ((tp = find_fw_table(ACPI_SIG_MADT)) != NULL)
                process_madt((ACPI_TABLE_MADT *)tp);

        if ((srat_ptr = (ACPI_TABLE_SRAT *)
            find_fw_table(ACPI_SIG_SRAT)) != NULL)
                process_srat(srat_ptr);

        if (slit_ptr = (ACPI_TABLE_SLIT *)find_fw_table(ACPI_SIG_SLIT))
                process_slit(slit_ptr);

        tp = find_fw_table(ACPI_SIG_MCFG);
#else /* __xpv */
        enumerate_xen_cpus();
        if (DOMAIN_IS_INITDOMAIN(xen_info))
                tp = find_fw_table(ACPI_SIG_MCFG);
#endif /* __xpv */
        if (tp != NULL)
                process_mcfg((ACPI_TABLE_MCFG *)tp);
}

/*
 * fake up a boot property for deferred early console output
 * this is used by both graphical boot and the (developer only)
 * USB serial console
 */
void *
defcons_init(size_t size)
{
        static char *p = NULL;

        p = do_bsys_alloc(NULL, NULL, size, MMU_PAGESIZE);
        *p = 0;
        bsetprop("deferred-console-buf", strlen("deferred-console-buf") + 1,
            &p, sizeof (p));
        return (p);
}

/*ARGSUSED*/
int
boot_compinfo(int fd, struct compinfo *cbp)
{
        cbp->iscmp = 0;
        cbp->blksize = MAXBSIZE;
        return (0);
}

#define BP_MAX_STRLEN   32

/*
 * Get value for given boot property
 */
int
bootprop_getval(const char *prop_name, u_longlong_t *prop_value)
{
        int             boot_prop_len;
        char            str[BP_MAX_STRLEN];
        u_longlong_t    value;

        boot_prop_len = BOP_GETPROPLEN(bootops, prop_name);
        if (boot_prop_len < 0 || boot_prop_len > sizeof (str) ||
            BOP_GETPROP(bootops, prop_name, str) < 0 ||
            kobj_getvalue(str, &value) == -1)
                return (-1);

        if (prop_value)
                *prop_value = value;

        return (0);
}