9597 Want hypervisor API for FPU management

[unleashed.git] / usr / src / uts / i86pc / os / startup.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) 1993, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2012 DEY Storage Systems, Inc.  All rights reserved.
 * Copyright 2017 Nexenta Systems, Inc.
 * Copyright (c) 2018 Joyent, Inc.
 * Copyright (c) 2015 by Delphix. All rights reserved.
 */
/*
 * Copyright (c) 2010, Intel Corporation.
 * All rights reserved.
 */

#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/param.h>
#include <sys/sysmacros.h>
#include <sys/signal.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/mman.h>
#include <sys/vm.h>
#include <sys/conf.h>
#include <sys/avintr.h>
#include <sys/autoconf.h>
#include <sys/disp.h>
#include <sys/class.h>
#include <sys/bitmap.h>

#include <sys/privregs.h>

#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/mem.h>
#include <sys/kstat.h>

#include <sys/reboot.h>

#include <sys/cred.h>
#include <sys/vnode.h>
#include <sys/file.h>

#include <sys/procfs.h>

#include <sys/vfs.h>
#include <sys/cmn_err.h>
#include <sys/utsname.h>
#include <sys/debug.h>
#include <sys/kdi.h>

#include <sys/dumphdr.h>
#include <sys/bootconf.h>
#include <sys/memlist_plat.h>
#include <sys/varargs.h>
#include <sys/promif.h>
#include <sys/modctl.h>

#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/ndi_impldefs.h>
#include <sys/ddidmareq.h>
#include <sys/psw.h>
#include <sys/regset.h>
#include <sys/clock.h>
#include <sys/pte.h>
#include <sys/tss.h>
#include <sys/stack.h>
#include <sys/trap.h>
#include <sys/fp.h>
#include <vm/kboot_mmu.h>
#include <vm/anon.h>
#include <vm/as.h>
#include <vm/page.h>
#include <vm/seg.h>
#include <vm/seg_dev.h>
#include <vm/seg_kmem.h>
#include <vm/seg_kpm.h>
#include <vm/seg_map.h>
#include <vm/seg_vn.h>
#include <vm/seg_kp.h>
#include <sys/memnode.h>
#include <vm/vm_dep.h>
#include <sys/thread.h>
#include <sys/sysconf.h>
#include <sys/vm_machparam.h>
#include <sys/archsystm.h>
#include <sys/machsystm.h>
#include <vm/hat.h>
#include <vm/hat_i86.h>
#include <sys/pmem.h>
#include <sys/smp_impldefs.h>
#include <sys/x86_archext.h>
#include <sys/cpuvar.h>
#include <sys/segments.h>
#include <sys/clconf.h>
#include <sys/kobj.h>
#include <sys/kobj_lex.h>
#include <sys/cpc_impl.h>
#include <sys/cpu_module.h>
#include <sys/smbios.h>
#include <sys/debug_info.h>
#include <sys/bootinfo.h>
#include <sys/ddi_periodic.h>
#include <sys/systeminfo.h>
#include <sys/multiboot.h>
#include <sys/ramdisk.h>

#ifdef  __xpv

#include <sys/hypervisor.h>
#include <sys/xen_mmu.h>
#include <sys/evtchn_impl.h>
#include <sys/gnttab.h>
#include <sys/xpv_panic.h>
#include <xen/sys/xenbus_comms.h>
#include <xen/public/physdev.h>

extern void xen_late_startup(void);

struct xen_evt_data cpu0_evt_data;

#else   /* __xpv */
#include <sys/memlist_impl.h>

extern void mem_config_init(void);
#endif /* __xpv */

extern void progressbar_init(void);
extern void brand_init(void);
extern void pcf_init(void);
extern void pg_init(void);
extern void ssp_init(void);

extern int size_pse_array(pgcnt_t, int);

#if defined(_SOFT_HOSTID)

#include <sys/rtc.h>

static int32_t set_soft_hostid(void);
static char hostid_file[] = "/etc/hostid";

#endif

void *gfx_devinfo_list;

#if defined(__amd64) && !defined(__xpv)
extern void immu_startup(void);
#endif

/*
 * XXX make declaration below "static" when drivers no longer use this
 * interface.
 */
extern caddr_t p0_va;   /* Virtual address for accessing physical page 0 */

/*
 * segkp
 */
extern int segkp_fromheap;

static void kvm_init(void);
static void startup_init(void);
static void startup_memlist(void);
static void startup_kmem(void);
static void startup_modules(void);
static void startup_vm(void);
static void startup_end(void);
static void layout_kernel_va(void);

/*
 * Declare these as initialized data so we can patch them.
 */
#ifdef __i386

/*
 * Due to virtual address space limitations running in 32 bit mode, restrict
 * the amount of physical memory configured to a max of PHYSMEM pages (16g).
 *
 * If the physical max memory size of 64g were allowed to be configured, the
 * size of user virtual address space will be less than 1g. A limited user
 * address space greatly reduces the range of applications that can run.
 *
 * If more physical memory than PHYSMEM is required, users should preferably
 * run in 64 bit mode which has far looser virtual address space limitations.
 *
 * If 64 bit mode is not available (as in IA32) and/or more physical memory
 * than PHYSMEM is required in 32 bit mode, physmem can be set to the desired
 * value or to 0 (to configure all available memory) via eeprom(1M). kernelbase
 * should also be carefully tuned to balance out the need of the user
 * application while minimizing the risk of kernel heap exhaustion due to
 * kernelbase being set too high.
 */
#define PHYSMEM 0x400000

#else /* __amd64 */

/*
 * For now we can handle memory with physical addresses up to about
 * 64 Terabytes. This keeps the kernel above the VA hole, leaving roughly
 * half the VA space for seg_kpm. When systems get bigger than 64TB this
 * code will need revisiting. There is an implicit assumption that there
 * are no *huge* holes in the physical address space too.
 */
#define TERABYTE                (1ul << 40)
#define PHYSMEM_MAX64           mmu_btop(64 * TERABYTE)
#define PHYSMEM                 PHYSMEM_MAX64
#define AMD64_VA_HOLE_END       0xFFFF800000000000ul

#endif /* __amd64 */

pgcnt_t physmem = PHYSMEM;
pgcnt_t obp_pages;      /* Memory used by PROM for its text and data */

char *kobj_file_buf;
int kobj_file_bufsize;  /* set in /etc/system */

/* Global variables for MP support. Used in mp_startup */
caddr_t rm_platter_va = 0;
uint32_t rm_platter_pa;

int     auto_lpg_disable = 1;

/*
 * Some CPUs have holes in the middle of the 64-bit virtual address range.
 */
uintptr_t hole_start, hole_end;

/*
 * kpm mapping window
 */
caddr_t kpm_vbase;
size_t  kpm_size;
static int kpm_desired;
#ifdef __amd64
static uintptr_t segkpm_base = (uintptr_t)SEGKPM_BASE;
#endif

/*
 * Configuration parameters set at boot time.
 */

caddr_t econtig;                /* end of first block of contiguous kernel */

struct bootops          *bootops = 0;   /* passed in from boot */
struct bootops          **bootopsp;
struct boot_syscalls    *sysp;          /* passed in from boot */

char bootblock_fstype[16];

char kern_bootargs[OBP_MAXPATHLEN];
char kern_bootfile[OBP_MAXPATHLEN];

/*
 * ZFS zio segment.  This allows us to exclude large portions of ZFS data that
 * gets cached in kmem caches on the heap.  If this is set to zero, we allocate
 * zio buffers from their own segment, otherwise they are allocated from the
 * heap.  The optimization of allocating zio buffers from their own segment is
 * only valid on 64-bit kernels.
 */
#if defined(__amd64)
int segzio_fromheap = 0;
#else
int segzio_fromheap = 1;
#endif

/*
 * Give folks an escape hatch for disabling SMAP via kmdb. Doesn't work
 * post-boot.
 */
int disable_smap = 0;

/*
 * new memory fragmentations are possible in startup() due to BOP_ALLOCs. this
 * depends on number of BOP_ALLOC calls made and requested size, memory size
 * combination and whether boot.bin memory needs to be freed.
 */
#define POSS_NEW_FRAGMENTS      12

/*
 * VM data structures
 */
long page_hashsz;               /* Size of page hash table (power of two) */
unsigned int page_hashsz_shift; /* log2(page_hashsz) */
struct page *pp_base;           /* Base of initial system page struct array */
struct page **page_hash;        /* Page hash table */
pad_mutex_t *pse_mutex;         /* Locks protecting pp->p_selock */
size_t pse_table_size;          /* Number of mutexes in pse_mutex[] */
int pse_shift;                  /* log2(pse_table_size) */
struct seg ktextseg;            /* Segment used for kernel executable image */
struct seg kvalloc;             /* Segment used for "valloc" mapping */
struct seg kpseg;               /* Segment used for pageable kernel virt mem */
struct seg kmapseg;             /* Segment used for generic kernel mappings */
struct seg kdebugseg;           /* Segment used for the kernel debugger */

struct seg *segkmap = &kmapseg; /* Kernel generic mapping segment */
static struct seg *segmap = &kmapseg;   /* easier to use name for in here */

struct seg *segkp = &kpseg;     /* Pageable kernel virtual memory segment */

#if defined(__amd64)
struct seg kvseg_core;          /* Segment used for the core heap */
struct seg kpmseg;              /* Segment used for physical mapping */
struct seg *segkpm = &kpmseg;   /* 64bit kernel physical mapping segment */
#else
struct seg *segkpm = NULL;      /* Unused on IA32 */
#endif

caddr_t segkp_base;             /* Base address of segkp */
caddr_t segzio_base;            /* Base address of segzio */
#if defined(__amd64)
pgcnt_t segkpsize = btop(SEGKPDEFSIZE); /* size of segkp segment in pages */
#else
pgcnt_t segkpsize = 0;
#endif
pgcnt_t segziosize = 0;         /* size of zio segment in pages */

/*
 * A static DR page_t VA map is reserved that can map the page structures
 * for a domain's entire RA space. The pages that back this space are
 * dynamically allocated and need not be physically contiguous.  The DR
 * map size is derived from KPM size.
 * This mechanism isn't used by x86 yet, so just stubs here.
 */
int ppvm_enable = 0;            /* Static virtual map for page structs */
page_t *ppvm_base = NULL;       /* Base of page struct map */
pgcnt_t ppvm_size = 0;          /* Size of page struct map */

/*
 * VA range available to the debugger
 */
const caddr_t kdi_segdebugbase = (const caddr_t)SEGDEBUGBASE;
const size_t kdi_segdebugsize = SEGDEBUGSIZE;

struct memseg *memseg_base;
struct vnode unused_pages_vp;

#define FOURGB  0x100000000LL

struct memlist *memlist;

caddr_t s_text;         /* start of kernel text segment */
caddr_t e_text;         /* end of kernel text segment */
caddr_t s_data;         /* start of kernel data segment */
caddr_t e_data;         /* end of kernel data segment */
caddr_t modtext;        /* start of loadable module text reserved */
caddr_t e_modtext;      /* end of loadable module text reserved */
caddr_t moddata;        /* start of loadable module data reserved */
caddr_t e_moddata;      /* end of loadable module data reserved */

struct memlist *phys_install;   /* Total installed physical memory */
struct memlist *phys_avail;     /* Total available physical memory */
struct memlist *bios_rsvd;      /* Bios reserved memory */

/*
 * kphysm_init returns the number of pages that were processed
 */
static pgcnt_t kphysm_init(page_t *, pgcnt_t);

#define IO_PROP_SIZE    64      /* device property size */

/*
 * a couple useful roundup macros
 */
#define ROUND_UP_PAGE(x)        \
        ((uintptr_t)P2ROUNDUP((uintptr_t)(x), (uintptr_t)MMU_PAGESIZE))
#define ROUND_UP_LPAGE(x)       \
        ((uintptr_t)P2ROUNDUP((uintptr_t)(x), mmu.level_size[1]))
#define ROUND_UP_4MEG(x)        \
        ((uintptr_t)P2ROUNDUP((uintptr_t)(x), (uintptr_t)FOUR_MEG))
#define ROUND_UP_TOPLEVEL(x)    \
        ((uintptr_t)P2ROUNDUP((uintptr_t)(x), mmu.level_size[mmu.max_level]))

/*
 *      32-bit Kernel's Virtual memory layout.
 *              +-----------------------+
 *              |                       |
 * 0xFFC00000  -|-----------------------|- ARGSBASE
 *              |       debugger        |
 * 0xFF800000  -|-----------------------|- SEGDEBUGBASE
 *              |      Kernel Data      |
 * 0xFEC00000  -|-----------------------|
 *              |      Kernel Text      |
 * 0xFE800000  -|-----------------------|- KERNEL_TEXT (0xFB400000 on Xen)
 *              |---       GDT       ---|- GDT page (GDT_VA)
 *              |---    debug info   ---|- debug info (DEBUG_INFO_VA)
 *              |                       |
 *              |   page_t structures   |
 *              |   memsegs, memlists,  |
 *              |   page hash, etc.     |
 * ---         -|-----------------------|- ekernelheap, valloc_base (floating)
 *              |                       |  (segkp is just an arena in the heap)
 *              |                       |
 *              |       kvseg           |
 *              |                       |
 *              |                       |
 * ---         -|-----------------------|- kernelheap (floating)
 *              |        Segkmap        |
 * 0xC3002000  -|-----------------------|- segmap_start (floating)
 *              |       Red Zone        |
 * 0xC3000000  -|-----------------------|- kernelbase / userlimit (floating)
 *              |                       |                       ||
 *              |     Shared objects    |                       \/
 *              |                       |
 *              :                       :
 *              |       user data       |
 *              |-----------------------|
 *              |       user text       |
 * 0x08048000  -|-----------------------|
 *              |       user stack      |
 *              :                       :
 *              |       invalid         |
 * 0x00000000   +-----------------------+
 *
 *
 *              64-bit Kernel's Virtual memory layout. (assuming 64 bit app)
 *                      +-----------------------+
 *                      |                       |
 * 0xFFFFFFFF.FFC00000  |-----------------------|- ARGSBASE
 *                      |       debugger (?)    |
 * 0xFFFFFFFF.FF800000  |-----------------------|- SEGDEBUGBASE
 *                      |      unused           |
 *                      +-----------------------+
 *                      |      Kernel Data      |
 * 0xFFFFFFFF.FBC00000  |-----------------------|
 *                      |      Kernel Text      |
 * 0xFFFFFFFF.FB800000  |-----------------------|- KERNEL_TEXT
 *                      |---    debug info   ---|- debug info (DEBUG_INFO_VA)
 *                      |---       GDT       ---|- GDT page (GDT_VA)
 *                      |---       IDT       ---|- IDT page (IDT_VA)
 *                      |---       LDT       ---|- LDT pages (LDT_VA)
 *                      |                       |
 *                      |      Core heap        | (used for loadable modules)
 * 0xFFFFFFFF.C0000000  |-----------------------|- core_base / ekernelheap
 *                      |        Kernel         |
 *                      |         heap          |
 * 0xFFFFFXXX.XXX00000  |-----------------------|- kernelheap (floating)
 *                      |        segmap         |
 * 0xFFFFFXXX.XXX00000  |-----------------------|- segmap_start (floating)
 *                      |    device mappings    |
 * 0xFFFFFXXX.XXX00000  |-----------------------|- toxic_addr (floating)
 *                      |         segzio        |
 * 0xFFFFFXXX.XXX00000  |-----------------------|- segzio_base (floating)
 *                      |         segkp         |
 * ---                  |-----------------------|- segkp_base (floating)
 *                      |   page_t structures   |  valloc_base + valloc_sz
 *                      |   memsegs, memlists,  |
 *                      |   page hash, etc.     |
 * 0xFFFFFF00.00000000  |-----------------------|- valloc_base (lower if >256GB)
 *                      |        segkpm         |
 * 0xFFFFFE00.00000000  |-----------------------|
 *                      |       Red Zone        |
 * 0xFFFFFD80.00000000  |-----------------------|- KERNELBASE (lower if >256GB)
 *                      |     User stack        |- User space memory
 *                      |                       |
 *                      | shared objects, etc   |       (grows downwards)
 *                      :                       :
 *                      |                       |
 * 0xFFFF8000.00000000  |-----------------------|
 *                      |                       |
 *                      | VA Hole / unused      |
 *                      |                       |
 * 0x00008000.00000000  |-----------------------|
 *                      |                       |
 *                      |                       |
 *                      :                       :
 *                      |       user heap       |       (grows upwards)
 *                      |                       |
 *                      |       user data       |
 *                      |-----------------------|
 *                      |       user text       |
 * 0x00000000.04000000  |-----------------------|
 *                      |       invalid         |
 * 0x00000000.00000000  +-----------------------+
 *
 * A 32 bit app on the 64 bit kernel sees the same layout as on the 32 bit
 * kernel, except that userlimit is raised to 0xfe000000
 *
 * Floating values:
 *
 * valloc_base: start of the kernel's memory management/tracking data
 * structures.  This region contains page_t structures for
 * physical memory, memsegs, memlists, and the page hash.
 *
 * core_base: start of the kernel's "core" heap area on 64-bit systems.
 * This area is intended to be used for global data as well as for module
 * text/data that does not fit into the nucleus pages.  The core heap is
 * restricted to a 2GB range, allowing every address within it to be
 * accessed using rip-relative addressing
 *
 * ekernelheap: end of kernelheap and start of segmap.
 *
 * kernelheap: start of kernel heap.  On 32-bit systems, this starts right
 * above a red zone that separates the user's address space from the
 * kernel's.  On 64-bit systems, it sits above segkp and segkpm.
 *
 * segmap_start: start of segmap. The length of segmap can be modified
 * through eeprom. The default length is 16MB on 32-bit systems and 64MB
 * on 64-bit systems.
 *
 * kernelbase: On a 32-bit kernel the default value of 0xd4000000 will be
 * decreased by 2X the size required for page_t.  This allows the kernel
 * heap to grow in size with physical memory.  With sizeof(page_t) == 80
 * bytes, the following shows the values of kernelbase and kernel heap
 * sizes for different memory configurations (assuming default segmap and
 * segkp sizes).
 *
 *      mem     size for        kernelbase      kernel heap
 *      size    page_t's                        size
 *      ----    ---------       ----------      -----------
 *      1gb     0x01400000      0xd1800000      684MB
 *      2gb     0x02800000      0xcf000000      704MB
 *      4gb     0x05000000      0xca000000      744MB
 *      6gb     0x07800000      0xc5000000      784MB
 *      8gb     0x0a000000      0xc0000000      824MB
 *      16gb    0x14000000      0xac000000      984MB
 *      32gb    0x28000000      0x84000000      1304MB
 *      64gb    0x50000000      0x34000000      1944MB (*)
 *
 * kernelbase is less than the abi minimum of 0xc0000000 for memory
 * configurations above 8gb.
 *
 * (*) support for memory configurations above 32gb will require manual tuning
 * of kernelbase to balance out the need of user applications.
 */

/* real-time-clock initialization parameters */
extern time_t process_rtc_config_file(void);

uintptr_t       kernelbase;
uintptr_t       postbootkernelbase;     /* not set till boot loader is gone */
uintptr_t       eprom_kernelbase;
size_t          segmapsize;
uintptr_t       segmap_start;
int             segmapfreelists;
pgcnt_t         npages;
pgcnt_t         orig_npages;
size_t          core_size;              /* size of "core" heap */
uintptr_t       core_base;              /* base address of "core" heap */

/*
 * List of bootstrap pages. We mark these as allocated in startup.
 * release_bootstrap() will free them when we're completely done with
 * the bootstrap.
 */
static page_t *bootpages;

/*
 * boot time pages that have a vnode from the ramdisk will keep that forever.
 */
static page_t *rd_pages;

/*
 * Lower 64K
 */
static page_t *lower_pages = NULL;
static int lower_pages_count = 0;

struct system_hardware system_hardware;

/*
 * Enable some debugging messages concerning memory usage...
 */
static void
print_memlist(char *title, struct memlist *mp)
{
        prom_printf("MEMLIST: %s:\n", title);
        while (mp != NULL)  {
                prom_printf("\tAddress 0x%" PRIx64 ", size 0x%" PRIx64 "\n",
                    mp->ml_address, mp->ml_size);
                mp = mp->ml_next;
        }
}

/*
 * XX64 need a comment here.. are these just default values, surely
 * we read the "cpuid" type information to figure this out.
 */
int     l2cache_sz = 0x80000;
int     l2cache_linesz = 0x40;
int     l2cache_assoc = 1;

static size_t   textrepl_min_gb = 10;

/*
 * on 64 bit we use a predifined VA range for mapping devices in the kernel
 * on 32 bit the mappings are intermixed in the heap, so we use a bit map
 */
#ifdef __amd64

vmem_t          *device_arena;
uintptr_t       toxic_addr = (uintptr_t)NULL;
size_t          toxic_size = 1024 * 1024 * 1024; /* Sparc uses 1 gig too */

#else   /* __i386 */

ulong_t         *toxic_bit_map; /* one bit for each 4k of VA in heap_arena */
size_t          toxic_bit_map_len = 0;  /* in bits */

#endif  /* __i386 */

/*
 * Simple boot time debug facilities
 */
static char *prm_dbg_str[] = {
        "%s:%d: '%s' is 0x%x\n",
        "%s:%d: '%s' is 0x%llx\n"
};

int prom_debug;

#define PRM_DEBUG(q)    if (prom_debug)         \
        prom_printf(prm_dbg_str[sizeof (q) >> 3], "startup.c", __LINE__, #q, q);
#define PRM_POINT(q)    if (prom_debug)         \
        prom_printf("%s:%d: %s\n", "startup.c", __LINE__, q);

/*
 * This structure is used to keep track of the intial allocations
 * done in startup_memlist(). The value of NUM_ALLOCATIONS needs to
 * be >= the number of ADD_TO_ALLOCATIONS() executed in the code.
 */
#define NUM_ALLOCATIONS 8
int num_allocations = 0;
struct {
        void **al_ptr;
        size_t al_size;
} allocations[NUM_ALLOCATIONS];
size_t valloc_sz = 0;
uintptr_t valloc_base;

#define ADD_TO_ALLOCATIONS(ptr, size) {                                 \
                size = ROUND_UP_PAGE(size);                             \
                if (num_allocations == NUM_ALLOCATIONS)                 \
                        panic("too many ADD_TO_ALLOCATIONS()");         \
                allocations[num_allocations].al_ptr = (void**)&ptr;     \
                allocations[num_allocations].al_size = size;            \
                valloc_sz += size;                                      \
                ++num_allocations;                                      \
        }

/*
 * Allocate all the initial memory needed by the page allocator.
 */
static void
perform_allocations(void)
{
        caddr_t mem;
        int i;
        int valloc_align;

        PRM_DEBUG(valloc_base);
        PRM_DEBUG(valloc_sz);
        valloc_align = mmu.level_size[mmu.max_page_level > 0];
        mem = BOP_ALLOC(bootops, (caddr_t)valloc_base, valloc_sz, valloc_align);
        if (mem != (caddr_t)valloc_base)
                panic("BOP_ALLOC() failed");
        bzero(mem, valloc_sz);
        for (i = 0; i < num_allocations; ++i) {
                *allocations[i].al_ptr = (void *)mem;
                mem += allocations[i].al_size;
        }
}

/*
 * Set up and enable SMAP now before we start other CPUs, but after the kernel's
 * VM has been set up so we can use hot_patch_kernel_text().
 *
 * We can only patch 1, 2, or 4 bytes, but not three bytes. So instead, we
 * replace the four byte word at the patch point. See uts/intel/ia32/ml/copy.s
 * for more information on what's going on here.
 */
static void
startup_smap(void)
{
        int i;
        uint32_t inst;
        uint8_t *instp;
        char sym[128];

        extern int _smap_enable_patch_count;
        extern int _smap_disable_patch_count;

        if (disable_smap != 0)
                remove_x86_feature(x86_featureset, X86FSET_SMAP);

        if (is_x86_feature(x86_featureset, X86FSET_SMAP) == B_FALSE)
                return;

        for (i = 0; i < _smap_enable_patch_count; i++) {
                int sizep;

                VERIFY3U(i, <, _smap_enable_patch_count);
                VERIFY(snprintf(sym, sizeof (sym), "_smap_enable_patch_%d", i) <
                    sizeof (sym));
                instp = (uint8_t *)(void *)kobj_getelfsym(sym, NULL, &sizep);
                VERIFY(instp != 0);
                inst = (instp[3] << 24) | (SMAP_CLAC_INSTR & 0x00ffffff);
                hot_patch_kernel_text((caddr_t)instp, inst, 4);
        }

        for (i = 0; i < _smap_disable_patch_count; i++) {
                int sizep;

                VERIFY(snprintf(sym, sizeof (sym), "_smap_disable_patch_%d",
                    i) < sizeof (sym));
                instp = (uint8_t *)(void *)kobj_getelfsym(sym, NULL, &sizep);
                VERIFY(instp != 0);
                inst = (instp[3] << 24) | (SMAP_STAC_INSTR & 0x00ffffff);
                hot_patch_kernel_text((caddr_t)instp, inst, 4);
        }

        hot_patch_kernel_text((caddr_t)smap_enable, SMAP_CLAC_INSTR, 4);
        hot_patch_kernel_text((caddr_t)smap_disable, SMAP_STAC_INSTR, 4);
        setcr4(getcr4() | CR4_SMAP);
        smap_enable();
}

/*
 * Our world looks like this at startup time.
 *
 * In a 32-bit OS, boot loads the kernel text at 0xfe800000 and kernel data
 * at 0xfec00000.  On a 64-bit OS, kernel text and data are loaded at
 * 0xffffffff.fe800000 and 0xffffffff.fec00000 respectively.  Those
 * addresses are fixed in the binary at link time.
 *
 * On the text page:
 * unix/genunix/krtld/module text loads.
 *
 * On the data page:
 * unix/genunix/krtld/module data loads.
 *
 * Machine-dependent startup code
 */
void
startup(void)
{
#if !defined(__xpv)
        extern void startup_pci_bios(void);
#endif
        extern cpuset_t cpu_ready_set;

        /*
         * Make sure that nobody tries to use sekpm until we have
         * initialized it properly.
         */
#if defined(__amd64)
        kpm_desired = 1;
#endif
        kpm_enable = 0;
        CPUSET_ONLY(cpu_ready_set, 0);  /* cpu 0 is boot cpu */

#if defined(__xpv)      /* XXPV fix me! */
        {
                extern int segvn_use_regions;
                segvn_use_regions = 0;
        }
#endif
        ssp_init();
        progressbar_init();
        startup_init();
#if defined(__xpv)
        startup_xen_version();
#endif
        startup_memlist();
        startup_kmem();
        startup_vm();
#if !defined(__xpv)
        /*
         * Note we need to do this even on fast reboot in order to access
         * the irq routing table (used for pci labels).
         */
        startup_pci_bios();
        startup_smap();
#endif
#if defined(__xpv)
        startup_xen_mca();
#endif
        startup_modules();

        startup_end();
}

static void
startup_init()
{
        PRM_POINT("startup_init() starting...");

        /*
         * Complete the extraction of cpuid data
         */
        cpuid_pass2(CPU);

        (void) check_boot_version(BOP_GETVERSION(bootops));

        /*
         * Check for prom_debug in boot environment
         */
        if (BOP_GETPROPLEN(bootops, "prom_debug") >= 0) {
                ++prom_debug;
                PRM_POINT("prom_debug found in boot enviroment");
        }

        /*
         * Collect node, cpu and memory configuration information.
         */
        get_system_configuration();

        /*
         * Halt if this is an unsupported processor.
         */
        if (x86_type == X86_TYPE_486 || x86_type == X86_TYPE_CYRIX_486) {
                printf("\n486 processor (\"%s\") detected.\n",
                    CPU->cpu_brandstr);
                halt("This processor is not supported by this release "
                    "of Solaris.");
        }

        PRM_POINT("startup_init() done");
}

/*
 * Callback for copy_memlist_filter() to filter nucleus, kadb/kmdb, (ie.
 * everything mapped above KERNEL_TEXT) pages from phys_avail. Note it
 * also filters out physical page zero.  There is some reliance on the
 * boot loader allocating only a few contiguous physical memory chunks.
 */
static void
avail_filter(uint64_t *addr, uint64_t *size)
{
        uintptr_t va;
        uintptr_t next_va;
        pfn_t pfn;
        uint64_t pfn_addr;
        uint64_t pfn_eaddr;
        uint_t prot;
        size_t len;
        uint_t change;

        if (prom_debug)
                prom_printf("\tFilter: in: a=%" PRIx64 ", s=%" PRIx64 "\n",
                    *addr, *size);

        /*
         * page zero is required for BIOS.. never make it available
         */
        if (*addr == 0) {
                *addr += MMU_PAGESIZE;
                *size -= MMU_PAGESIZE;
        }

        /*
         * First we trim from the front of the range. Since kbm_probe()
         * walks ranges in virtual order, but addr/size are physical, we need
         * to the list until no changes are seen.  This deals with the case
         * where page "p" is mapped at v, page "p + PAGESIZE" is mapped at w
         * but w < v.
         */
        do {
                change = 0;
                for (va = KERNEL_TEXT;
                    *size > 0 && kbm_probe(&va, &len, &pfn, &prot) != 0;
                    va = next_va) {

                        next_va = va + len;
                        pfn_addr = pfn_to_pa(pfn);
                        pfn_eaddr = pfn_addr + len;

                        if (pfn_addr <= *addr && pfn_eaddr > *addr) {
                                change = 1;
                                while (*size > 0 && len > 0) {
                                        *addr += MMU_PAGESIZE;
                                        *size -= MMU_PAGESIZE;
                                        len -= MMU_PAGESIZE;
                                }
                        }
                }
                if (change && prom_debug)
                        prom_printf("\t\ttrim: a=%" PRIx64 ", s=%" PRIx64 "\n",
                            *addr, *size);
        } while (change);

        /*
         * Trim pages from the end of the range.
         */
        for (va = KERNEL_TEXT;
            *size > 0 && kbm_probe(&va, &len, &pfn, &prot) != 0;
            va = next_va) {

                next_va = va + len;
                pfn_addr = pfn_to_pa(pfn);

                if (pfn_addr >= *addr && pfn_addr < *addr + *size)
                        *size = pfn_addr - *addr;
        }

        if (prom_debug)
                prom_printf("\tFilter out: a=%" PRIx64 ", s=%" PRIx64 "\n",
                    *addr, *size);
}

static void
kpm_init()
{
        struct segkpm_crargs b;

        /*
         * These variables were all designed for sfmmu in which segkpm is
         * mapped using a single pagesize - either 8KB or 4MB.  On x86, we
         * might use 2+ page sizes on a single machine, so none of these
         * variables have a single correct value.  They are set up as if we
         * always use a 4KB pagesize, which should do no harm.  In the long
         * run, we should get rid of KPM's assumption that only a single
         * pagesize is used.
         */
        kpm_pgshft = MMU_PAGESHIFT;
        kpm_pgsz =  MMU_PAGESIZE;
        kpm_pgoff = MMU_PAGEOFFSET;
        kpmp2pshft = 0;
        kpmpnpgs = 1;
        ASSERT(((uintptr_t)kpm_vbase & (kpm_pgsz - 1)) == 0);

        PRM_POINT("about to create segkpm");
        rw_enter(&kas.a_lock, RW_WRITER);

        if (seg_attach(&kas, kpm_vbase, kpm_size, segkpm) < 0)
                panic("cannot attach segkpm");

        b.prot = PROT_READ | PROT_WRITE;
        b.nvcolors = 1;

        if (segkpm_create(segkpm, (caddr_t)&b) != 0)
                panic("segkpm_create segkpm");

        rw_exit(&kas.a_lock);

        kpm_enable = 1;

        /*
         * As the KPM was disabled while setting up the system, go back and fix
         * CPU zero's access to its user page table. This is a bit gross, but
         * we have a chicken and egg problem otherwise.
         */
        ASSERT(CPU->cpu_hat_info->hci_user_l3ptes == NULL);
        CPU->cpu_hat_info->hci_user_l3ptes =
            (x86pte_t *)hat_kpm_mapin_pfn(CPU->cpu_hat_info->hci_user_l3pfn);
}

/*
 * The debug info page provides enough information to allow external
 * inspectors (e.g. when running under a hypervisor) to bootstrap
 * themselves into allowing full-blown kernel debugging.
 */
static void
init_debug_info(void)
{
        caddr_t mem;
        debug_info_t *di;

#ifndef __lint
        ASSERT(sizeof (debug_info_t) < MMU_PAGESIZE);
#endif

        mem = BOP_ALLOC(bootops, (caddr_t)DEBUG_INFO_VA, MMU_PAGESIZE,
            MMU_PAGESIZE);

        if (mem != (caddr_t)DEBUG_INFO_VA)
                panic("BOP_ALLOC() failed");
        bzero(mem, MMU_PAGESIZE);

        di = (debug_info_t *)mem;

        di->di_magic = DEBUG_INFO_MAGIC;
        di->di_version = DEBUG_INFO_VERSION;
        di->di_modules = (uintptr_t)&modules;
        di->di_s_text = (uintptr_t)s_text;
        di->di_e_text = (uintptr_t)e_text;
        di->di_s_data = (uintptr_t)s_data;
        di->di_e_data = (uintptr_t)e_data;
        di->di_hat_htable_off = offsetof(hat_t, hat_htable);
        di->di_ht_pfn_off = offsetof(htable_t, ht_pfn);
}

/*
 * Build the memlists and other kernel essential memory system data structures.
 * This is everything at valloc_base.
 */
static void
startup_memlist(void)
{
        size_t memlist_sz;
        size_t memseg_sz;
        size_t pagehash_sz;
        size_t pp_sz;
        uintptr_t va;
        size_t len;
        uint_t prot;
        pfn_t pfn;
        int memblocks;
        pfn_t rsvd_high_pfn;
        pgcnt_t rsvd_pgcnt;
        size_t rsvdmemlist_sz;
        int rsvdmemblocks;
        caddr_t pagecolor_mem;
        size_t pagecolor_memsz;
        caddr_t page_ctrs_mem;
        size_t page_ctrs_size;
        size_t pse_table_alloc_size;
        struct memlist *current;
        extern void startup_build_mem_nodes(struct memlist *);

        /* XX64 fix these - they should be in include files */
        extern size_t page_coloring_init(uint_t, int, int);
        extern void page_coloring_setup(caddr_t);

        PRM_POINT("startup_memlist() starting...");

        /*
         * Use leftover large page nucleus text/data space for loadable modules.
         * Use at most MODTEXT/MODDATA.
         */
        len = kbm_nucleus_size;
        ASSERT(len > MMU_PAGESIZE);

        moddata = (caddr_t)ROUND_UP_PAGE(e_data);
        e_moddata = (caddr_t)P2ROUNDUP((uintptr_t)e_data, (uintptr_t)len);
        if (e_moddata - moddata > MODDATA)
                e_moddata = moddata + MODDATA;

        modtext = (caddr_t)ROUND_UP_PAGE(e_text);
        e_modtext = (caddr_t)P2ROUNDUP((uintptr_t)e_text, (uintptr_t)len);
        if (e_modtext - modtext > MODTEXT)
                e_modtext = modtext + MODTEXT;

        econtig = e_moddata;

        PRM_DEBUG(modtext);
        PRM_DEBUG(e_modtext);
        PRM_DEBUG(moddata);
        PRM_DEBUG(e_moddata);
        PRM_DEBUG(econtig);

        /*
         * Examine the boot loader physical memory map to find out:
         * - total memory in system - physinstalled
         * - the max physical address - physmax
         * - the number of discontiguous segments of memory.
         */
        if (prom_debug)
                print_memlist("boot physinstalled",
                    bootops->boot_mem->physinstalled);
        installed_top_size_ex(bootops->boot_mem->physinstalled, &physmax,
            &physinstalled, &memblocks);
        PRM_DEBUG(physmax);
        PRM_DEBUG(physinstalled);
        PRM_DEBUG(memblocks);

        /*
         * Compute maximum physical address for memory DR operations.
         * Memory DR operations are unsupported on xpv or 32bit OSes.
         */
#ifdef  __amd64
        if (plat_dr_support_memory()) {
                if (plat_dr_physmax == 0) {
                        uint_t pabits = UINT_MAX;

                        cpuid_get_addrsize(CPU, &pabits, NULL);
                        plat_dr_physmax = btop(1ULL << pabits);
                }
                if (plat_dr_physmax > PHYSMEM_MAX64)
                        plat_dr_physmax = PHYSMEM_MAX64;
        } else
#endif
                plat_dr_physmax = 0;

        /*
         * Examine the bios reserved memory to find out:
         * - the number of discontiguous segments of memory.
         */
        if (prom_debug)
                print_memlist("boot reserved mem",
                    bootops->boot_mem->rsvdmem);
        installed_top_size_ex(bootops->boot_mem->rsvdmem, &rsvd_high_pfn,
            &rsvd_pgcnt, &rsvdmemblocks);
        PRM_DEBUG(rsvd_high_pfn);
        PRM_DEBUG(rsvd_pgcnt);
        PRM_DEBUG(rsvdmemblocks);

        /*
         * Initialize hat's mmu parameters.
         * Check for enforce-prot-exec in boot environment. It's used to
         * enable/disable support for the page table entry NX bit.
         * The default is to enforce PROT_EXEC on processors that support NX.
         * Boot seems to round up the "len", but 8 seems to be big enough.
         */
        mmu_init();

#ifdef  __i386
        /*
         * physmax is lowered if there is more memory than can be
         * physically addressed in 32 bit (PAE/non-PAE) modes.
         */
        if (mmu.pae_hat) {
                if (PFN_ABOVE64G(physmax)) {
                        physinstalled -= (physmax - (PFN_64G - 1));
                        physmax = PFN_64G - 1;
                }
        } else {
                if (PFN_ABOVE4G(physmax)) {
                        physinstalled -= (physmax - (PFN_4G - 1));
                        physmax = PFN_4G - 1;
                }
        }
#endif

        startup_build_mem_nodes(bootops->boot_mem->physinstalled);

        if (BOP_GETPROPLEN(bootops, "enforce-prot-exec") >= 0) {
                int len = BOP_GETPROPLEN(bootops, "enforce-prot-exec");
                char value[8];

                if (len < 8)
                        (void) BOP_GETPROP(bootops, "enforce-prot-exec", value);
                else
                        (void) strcpy(value, "");
                if (strcmp(value, "off") == 0)
                        mmu.pt_nx = 0;
        }
        PRM_DEBUG(mmu.pt_nx);

        /*
         * We will need page_t's for every page in the system, except for
         * memory mapped at or above above the start of the kernel text segment.
         *
         * pages above e_modtext are attributed to kernel debugger (obp_pages)
         */
        npages = physinstalled - 1; /* avail_filter() skips page 0, so "- 1" */
        obp_pages = 0;
        va = KERNEL_TEXT;
        while (kbm_probe(&va, &len, &pfn, &prot) != 0) {
                npages -= len >> MMU_PAGESHIFT;
                if (va >= (uintptr_t)e_moddata)
                        obp_pages += len >> MMU_PAGESHIFT;
                va += len;
        }
        PRM_DEBUG(npages);
        PRM_DEBUG(obp_pages);

        /*
         * If physmem is patched to be non-zero, use it instead of the computed
         * value unless it is larger than the actual amount of memory on hand.
         */
        if (physmem == 0 || physmem > npages) {
                physmem = npages;
        } else if (physmem < npages) {
                orig_npages = npages;
                npages = physmem;
        }
        PRM_DEBUG(physmem);

        /*
         * We now compute the sizes of all the  initial allocations for
         * structures the kernel needs in order do kmem_alloc(). These
         * include:
         *      memsegs
         *      memlists
         *      page hash table
         *      page_t's
         *      page coloring data structs
         */
        memseg_sz = sizeof (struct memseg) * (memblocks + POSS_NEW_FRAGMENTS);
        ADD_TO_ALLOCATIONS(memseg_base, memseg_sz);
        PRM_DEBUG(memseg_sz);

        /*
         * Reserve space for memlists. There's no real good way to know exactly
         * how much room we'll need, but this should be a good upper bound.
         */
        memlist_sz = ROUND_UP_PAGE(2 * sizeof (struct memlist) *
            (memblocks + POSS_NEW_FRAGMENTS));
        ADD_TO_ALLOCATIONS(memlist, memlist_sz);
        PRM_DEBUG(memlist_sz);

        /*
         * Reserve space for bios reserved memlists.
         */
        rsvdmemlist_sz = ROUND_UP_PAGE(2 * sizeof (struct memlist) *
            (rsvdmemblocks + POSS_NEW_FRAGMENTS));
        ADD_TO_ALLOCATIONS(bios_rsvd, rsvdmemlist_sz);
        PRM_DEBUG(rsvdmemlist_sz);

        /* LINTED */
        ASSERT(P2SAMEHIGHBIT((1 << PP_SHIFT), sizeof (struct page)));
        /*
         * The page structure hash table size is a power of 2
         * such that the average hash chain length is PAGE_HASHAVELEN.
         */
        page_hashsz = npages / PAGE_HASHAVELEN;
        page_hashsz_shift = highbit(page_hashsz);
        page_hashsz = 1 << page_hashsz_shift;
        pagehash_sz = sizeof (struct page *) * page_hashsz;
        ADD_TO_ALLOCATIONS(page_hash, pagehash_sz);
        PRM_DEBUG(pagehash_sz);

        /*
         * Set aside room for the page structures themselves.
         */
        PRM_DEBUG(npages);
        pp_sz = sizeof (struct page) * npages;
        ADD_TO_ALLOCATIONS(pp_base, pp_sz);
        PRM_DEBUG(pp_sz);

        /*
         * determine l2 cache info and memory size for page coloring
         */
        (void) getl2cacheinfo(CPU,
            &l2cache_sz, &l2cache_linesz, &l2cache_assoc);
        pagecolor_memsz =
            page_coloring_init(l2cache_sz, l2cache_linesz, l2cache_assoc);
        ADD_TO_ALLOCATIONS(pagecolor_mem, pagecolor_memsz);
        PRM_DEBUG(pagecolor_memsz);

        page_ctrs_size = page_ctrs_sz();
        ADD_TO_ALLOCATIONS(page_ctrs_mem, page_ctrs_size);
        PRM_DEBUG(page_ctrs_size);

        /*
         * Allocate the array that protects pp->p_selock.
         */
        pse_shift = size_pse_array(physmem, max_ncpus);
        pse_table_size = 1 << pse_shift;
        pse_table_alloc_size = pse_table_size * sizeof (pad_mutex_t);
        ADD_TO_ALLOCATIONS(pse_mutex, pse_table_alloc_size);

#if defined(__amd64)
        valloc_sz = ROUND_UP_LPAGE(valloc_sz);
        valloc_base = VALLOC_BASE;

        /*
         * The default values of VALLOC_BASE and SEGKPM_BASE should work
         * for values of physmax up to 256GB (1/4 TB). They need adjusting when
         * memory is at addresses above 256GB. When adjusted, segkpm_base must
         * be aligned on KERNEL_REDZONE_SIZE boundary (span of top level pte).
         *
         * In the general case (>256GB), we use (4 * physmem) for the
         * kernel's virtual addresses, which is divided approximately
         * as follows:
         *  - 1 * physmem for segkpm
         *  - 1.5 * physmem for segzio
         *  - 1.5 * physmem for heap
         * Total: 4.0 * physmem
         *
         * Note that the segzio and heap sizes are more than physmem so that
         * VA fragmentation does not prevent either of them from being
         * able to use nearly all of physmem.  The value of 1.5x is determined
         * experimentally and may need to change if the workload changes.
         */
        if (physmax + 1 > mmu_btop(TERABYTE / 4) ||
            plat_dr_physmax > mmu_btop(TERABYTE / 4)) {
                uint64_t kpm_resv_amount = mmu_ptob(physmax + 1);

                if (kpm_resv_amount < mmu_ptob(plat_dr_physmax)) {
                        kpm_resv_amount = mmu_ptob(plat_dr_physmax);
                }

                /*
                 * This is what actually controls the KVA : UVA split.
                 * The kernel uses high VA, and this is lowering the
                 * boundary, thus increasing the amount of VA for the kernel.
                 * This gives the kernel 4 * (amount of physical memory) VA.
                 *
                 * The maximum VA is UINT64_MAX and we are using
                 * 64-bit 2's complement math, so e.g. if you have 512GB
                 * of memory, segkpm_base = -(4 * 512GB) == -2TB ==
                 * UINT64_MAX - 2TB (approximately).  So the kernel's
                 * VA is [UINT64_MAX-2TB to UINT64_MAX].
                 */
                segkpm_base = -(P2ROUNDUP((4 * kpm_resv_amount),
                    KERNEL_REDZONE_SIZE));

                /* make sure we leave some space for user apps above hole */
                segkpm_base = MAX(segkpm_base, AMD64_VA_HOLE_END + TERABYTE);
                if (segkpm_base > SEGKPM_BASE)
                        segkpm_base = SEGKPM_BASE;
                PRM_DEBUG(segkpm_base);

                valloc_base = segkpm_base + P2ROUNDUP(kpm_resv_amount, ONE_GIG);
                if (valloc_base < segkpm_base)
                        panic("not enough kernel VA to support memory size");
                PRM_DEBUG(valloc_base);
        }
#else   /* __i386 */
        valloc_base = (uintptr_t)(MISC_VA_BASE - valloc_sz);
        valloc_base = P2ALIGN(valloc_base, mmu.level_size[1]);
        PRM_DEBUG(valloc_base);
#endif  /* __i386 */

        /*
         * do all the initial allocations
         */
        perform_allocations();

        /*
         * Build phys_install and phys_avail in kernel memspace.
         * - phys_install should be all memory in the system.
         * - phys_avail is phys_install minus any memory mapped before this
         *    point above KERNEL_TEXT.
         */
        current = phys_install = memlist;
        copy_memlist_filter(bootops->boot_mem->physinstalled, &current, NULL);
        if ((caddr_t)current > (caddr_t)memlist + memlist_sz)
                panic("physinstalled was too big!");
        if (prom_debug)
                print_memlist("phys_install", phys_install);

        phys_avail = current;
        PRM_POINT("Building phys_avail:\n");
        copy_memlist_filter(bootops->boot_mem->physinstalled, &current,
            avail_filter);
        if ((caddr_t)current > (caddr_t)memlist + memlist_sz)
                panic("physavail was too big!");
        if (prom_debug)
                print_memlist("phys_avail", phys_avail);
#ifndef __xpv
        /*
         * Free unused memlist items, which may be used by memory DR driver
         * at runtime.
         */
        if ((caddr_t)current < (caddr_t)memlist + memlist_sz) {
                memlist_free_block((caddr_t)current,
                    (caddr_t)memlist + memlist_sz - (caddr_t)current);
        }
#endif

        /*
         * Build bios reserved memspace
         */
        current = bios_rsvd;
        copy_memlist_filter(bootops->boot_mem->rsvdmem, &current, NULL);
        if ((caddr_t)current > (caddr_t)bios_rsvd + rsvdmemlist_sz)
                panic("bios_rsvd was too big!");
        if (prom_debug)
                print_memlist("bios_rsvd", bios_rsvd);
#ifndef __xpv
        /*
         * Free unused memlist items, which may be used by memory DR driver
         * at runtime.
         */
        if ((caddr_t)current < (caddr_t)bios_rsvd + rsvdmemlist_sz) {
                memlist_free_block((caddr_t)current,
                    (caddr_t)bios_rsvd + rsvdmemlist_sz - (caddr_t)current);
        }
#endif

        /*
         * setup page coloring
         */
        page_coloring_setup(pagecolor_mem);
        page_lock_init();       /* currently a no-op */

        /*
         * free page list counters
         */
        (void) page_ctrs_alloc(page_ctrs_mem);

        /*
         * Size the pcf array based on the number of cpus in the box at
         * boot time.
         */

        pcf_init();

        /*
         * Initialize the page structures from the memory lists.
         */
        availrmem_initial = availrmem = freemem = 0;
        PRM_POINT("Calling kphysm_init()...");
        npages = kphysm_init(pp_base, npages);
        PRM_POINT("kphysm_init() done");
        PRM_DEBUG(npages);

        init_debug_info();

        /*
         * Now that page_t's have been initialized, remove all the
         * initial allocation pages from the kernel free page lists.
         */
        boot_mapin((caddr_t)valloc_base, valloc_sz);
        boot_mapin((caddr_t)MISC_VA_BASE, MISC_VA_SIZE);
        PRM_POINT("startup_memlist() done");

        PRM_DEBUG(valloc_sz);

#if defined(__amd64)
        if ((availrmem >> (30 - MMU_PAGESHIFT)) >=
            textrepl_min_gb && l2cache_sz <= 2 << 20) {
                extern size_t textrepl_size_thresh;
                textrepl_size_thresh = (16 << 20) - 1;
        }
#endif
}

/*
 * Layout the kernel's part of address space and initialize kmem allocator.
 */
static void
startup_kmem(void)
{
        extern void page_set_colorequiv_arr(void);
#if !defined(__xpv)
        extern uint64_t kpti_kbase;
#endif

        PRM_POINT("startup_kmem() starting...");

#if defined(__amd64)
        if (eprom_kernelbase && eprom_kernelbase != KERNELBASE)
                cmn_err(CE_NOTE, "!kernelbase cannot be changed on 64-bit "
                    "systems.");
        kernelbase = segkpm_base - KERNEL_REDZONE_SIZE;
        core_base = (uintptr_t)COREHEAP_BASE;
        core_size = (size_t)MISC_VA_BASE - COREHEAP_BASE;
#else   /* __i386 */
        /*
         * We configure kernelbase based on:
         *
         * 1. user specified kernelbase via eeprom command. Value cannot exceed
         *    KERNELBASE_MAX. we large page align eprom_kernelbase
         *
         * 2. Default to KERNELBASE and adjust to 2X less the size for page_t.
         *    On large memory systems we must lower kernelbase to allow
         *    enough room for page_t's for all of memory.
         *
         * The value set here, might be changed a little later.
         */
        if (eprom_kernelbase) {
                kernelbase = eprom_kernelbase & mmu.level_mask[1];
                if (kernelbase > KERNELBASE_MAX)
                        kernelbase = KERNELBASE_MAX;
        } else {
                kernelbase = (uintptr_t)KERNELBASE;
                kernelbase -= ROUND_UP_4MEG(2 * valloc_sz);
        }
        ASSERT((kernelbase & mmu.level_offset[1]) == 0);
        core_base = valloc_base;
        core_size = 0;
#endif  /* __i386 */

        PRM_DEBUG(core_base);
        PRM_DEBUG(core_size);
        PRM_DEBUG(kernelbase);

#if defined(__i386)
        segkp_fromheap = 1;
#endif  /* __i386 */

        ekernelheap = (char *)core_base;
        PRM_DEBUG(ekernelheap);

        /*
         * Now that we know the real value of kernelbase,
         * update variables that were initialized with a value of
         * KERNELBASE (in common/conf/param.c).
         *
         * XXX  The problem with this sort of hackery is that the
         *      compiler just may feel like putting the const declarations
         *      (in param.c) into the .text section.  Perhaps they should
         *      just be declared as variables there?
         */

        *(uintptr_t *)&_kernelbase = kernelbase;
        *(uintptr_t *)&_userlimit = kernelbase;
#if defined(__amd64)
        *(uintptr_t *)&_userlimit -= KERNELBASE - USERLIMIT;
#if !defined(__xpv)
        kpti_kbase = kernelbase;
#endif
#else
        *(uintptr_t *)&_userlimit32 = _userlimit;
#endif
        PRM_DEBUG(_kernelbase);
        PRM_DEBUG(_userlimit);
        PRM_DEBUG(_userlimit32);

        /* We have to re-do this now that we've modified _userlimit. */
        mmu_calc_user_slots();

        layout_kernel_va();

#if defined(__i386)
        /*
         * If segmap is too large we can push the bottom of the kernel heap
         * higher than the base.  Or worse, it could exceed the top of the
         * VA space entirely, causing it to wrap around.
         */
        if (kernelheap >= ekernelheap || (uintptr_t)kernelheap < kernelbase)
                panic("too little address space available for kernelheap,"
                    " use eeprom for lower kernelbase or smaller segmapsize");
#endif  /* __i386 */

        /*
         * Initialize the kernel heap. Note 3rd argument must be > 1st.
         */
        kernelheap_init(kernelheap, ekernelheap,
            kernelheap + MMU_PAGESIZE,
            (void *)core_base, (void *)(core_base + core_size));

#if defined(__xpv)
        /*
         * Link pending events struct into cpu struct
         */
        CPU->cpu_m.mcpu_evt_pend = &cpu0_evt_data;
#endif
        /*
         * Initialize kernel memory allocator.
         */
        kmem_init();

        /*
         * Factor in colorequiv to check additional 'equivalent' bins
         */
        page_set_colorequiv_arr();

        /*
         * print this out early so that we know what's going on
         */
        print_x86_featureset(x86_featureset);

        /*
         * Initialize bp_mapin().
         */
        bp_init(MMU_PAGESIZE, HAT_STORECACHING_OK);

        /*
         * orig_npages is non-zero if physmem has been configured for less
         * than the available memory.
         */
        if (orig_npages) {
                cmn_err(CE_WARN, "!%slimiting physmem to 0x%lx of 0x%lx pages",
                    (npages == PHYSMEM ? "Due to virtual address space " : ""),
                    npages, orig_npages);
        }
#if defined(__i386)
        if (eprom_kernelbase && (eprom_kernelbase != kernelbase))
                cmn_err(CE_WARN, "kernelbase value, User specified 0x%lx, "
                    "System using 0x%lx",
                    (uintptr_t)eprom_kernelbase, (uintptr_t)kernelbase);
#endif

#ifdef  KERNELBASE_ABI_MIN
        if (kernelbase < (uintptr_t)KERNELBASE_ABI_MIN) {
                cmn_err(CE_NOTE, "!kernelbase set to 0x%lx, system is not "
                    "i386 ABI compliant.", (uintptr_t)kernelbase);
        }
#endif

#ifndef __xpv
        if (plat_dr_support_memory()) {
                mem_config_init();
        }
#else   /* __xpv */
        /*
         * Some of the xen start information has to be relocated up
         * into the kernel's permanent address space.
         */
        PRM_POINT("calling xen_relocate_start_info()");
        xen_relocate_start_info();
        PRM_POINT("xen_relocate_start_info() done");

        /*
         * (Update the vcpu pointer in our cpu structure to point into
         * the relocated shared info.)
         */
        CPU->cpu_m.mcpu_vcpu_info =
            &HYPERVISOR_shared_info->vcpu_info[CPU->cpu_id];
#endif  /* __xpv */

        PRM_POINT("startup_kmem() done");
}

#ifndef __xpv
/*
 * If we have detected that we are running in an HVM environment, we need
 * to prepend the PV driver directory to the module search path.
 */
#define HVM_MOD_DIR "/platform/i86hvm/kernel"
static void
update_default_path()
{
        char *current, *newpath;
        int newlen;

        /*
         * We are about to resync with krtld.  krtld will reset its
         * internal module search path iff Solaris has set default_path.
         * We want to be sure we're prepending this new directory to the
         * right search path.
         */
        current = (default_path == NULL) ? kobj_module_path : default_path;

        newlen = strlen(HVM_MOD_DIR) + strlen(current) + 2;
        newpath = kmem_alloc(newlen, KM_SLEEP);
        (void) strcpy(newpath, HVM_MOD_DIR);
        (void) strcat(newpath, " ");
        (void) strcat(newpath, current);

        default_path = newpath;
}
#endif

static void
startup_modules(void)
{
        int cnt;
        extern void prom_setup(void);
        int32_t v, h;
        char d[11];
        char *cp;
        cmi_hdl_t hdl;

        PRM_POINT("startup_modules() starting...");

#ifndef __xpv
        /*
         * Initialize ten-micro second timer so that drivers will
         * not get short changed in their init phase. This was
         * not getting called until clkinit which, on fast cpu's
         * caused the drv_usecwait to be way too short.
         */
        microfind();

        if ((get_hwenv() & HW_XEN_HVM) != 0)
                update_default_path();
#endif

        /*
         * Read the GMT lag from /etc/rtc_config.
         */
        sgmtl(process_rtc_config_file());

        /*
         * Calculate default settings of system parameters based upon
         * maxusers, yet allow to be overridden via the /etc/system file.
         */
        param_calc(0);

        mod_setup();

        /*
         * Initialize system parameters.
         */
        param_init();

        /*
         * Initialize the default brands
         */
        brand_init();

        /*
         * maxmem is the amount of physical memory we're playing with.
         */
        maxmem = physmem;

        /*
         * Initialize segment management stuff.
         */
        seg_init();

        if (modload("fs", "specfs") == -1)
                halt("Can't load specfs");

        if (modload("fs", "devfs") == -1)
                halt("Can't load devfs");

        if (modload("fs", "dev") == -1)
                halt("Can't load dev");

        if (modload("fs", "procfs") == -1)
                halt("Can't load procfs");

        (void) modloadonly("sys", "lbl_edition");

        dispinit();

        /* Read cluster configuration data. */
        clconf_init();

#if defined(__xpv)
        (void) ec_init();
        gnttab_init();
        (void) xs_early_init();
#endif /* __xpv */

        /*
         * Create a kernel device tree. First, create rootnex and
         * then invoke bus specific code to probe devices.
         */
        setup_ddi();

#ifdef __xpv
        if (DOMAIN_IS_INITDOMAIN(xen_info))
#endif
        {
                id_t smid;
                smbios_system_t smsys;
                smbios_info_t sminfo;
                char *mfg;
                /*
                 * Load the System Management BIOS into the global ksmbios
                 * handle, if an SMBIOS is present on this system.
                 * Also set "si-hw-provider" property, if not already set.
                 */
                ksmbios = smbios_open(NULL, SMB_VERSION, ksmbios_flags, NULL);
                if (ksmbios != NULL &&
                    ((smid = smbios_info_system(ksmbios, &smsys)) != SMB_ERR) &&
                    (smbios_info_common(ksmbios, smid, &sminfo)) != SMB_ERR) {
                        mfg = (char *)sminfo.smbi_manufacturer;
                        if (BOP_GETPROPLEN(bootops, "si-hw-provider") < 0) {
                                extern char hw_provider[];
                                int i;
                                for (i = 0; i < SYS_NMLN; i++) {
                                        if (isprint(mfg[i]))
                                                hw_provider[i] = mfg[i];
                                        else {
                                                hw_provider[i] = '\0';
                                                break;
                                        }
                                }
                                hw_provider[SYS_NMLN - 1] = '\0';
                        }
                }
        }


        /*
         * Originally clconf_init() apparently needed the hostid.  But
         * this no longer appears to be true - it uses its own nodeid.
         * By placing the hostid logic here, we are able to make use of
         * the SMBIOS UUID.
         */
        if ((h = set_soft_hostid()) == HW_INVALID_HOSTID) {
                cmn_err(CE_WARN, "Unable to set hostid");
        } else {
                for (v = h, cnt = 0; cnt < 10; cnt++) {
                        d[cnt] = (char)(v % 10);
                        v /= 10;
                        if (v == 0)
                                break;
                }
                for (cp = hw_serial; cnt >= 0; cnt--)
                        *cp++ = d[cnt] + '0';
                *cp = 0;
        }

        /*
         * Set up the CPU module subsystem for the boot cpu in the native
         * case, and all physical cpu resource in the xpv dom0 case.
         * Modifies the device tree, so this must be done after
         * setup_ddi().
         */
#ifdef __xpv
        /*
         * If paravirtualized and on dom0 then we initialize all physical
         * cpu handles now;  if paravirtualized on a domU then do not
         * initialize.
         */
        if (DOMAIN_IS_INITDOMAIN(xen_info)) {
                xen_mc_lcpu_cookie_t cpi;

                for (cpi = xen_physcpu_next(NULL); cpi != NULL;
                    cpi = xen_physcpu_next(cpi)) {
                        if ((hdl = cmi_init(CMI_HDL_SOLARIS_xVM_MCA,
                            xen_physcpu_chipid(cpi), xen_physcpu_coreid(cpi),
                            xen_physcpu_strandid(cpi))) != NULL &&
                            is_x86_feature(x86_featureset, X86FSET_MCA))
                                cmi_mca_init(hdl);
                }
        }
#else
        /*
         * Initialize a handle for the boot cpu - others will initialize
         * as they startup.
         */
        if ((hdl = cmi_init(CMI_HDL_NATIVE, cmi_ntv_hwchipid(CPU),
            cmi_ntv_hwcoreid(CPU), cmi_ntv_hwstrandid(CPU))) != NULL) {
                if (is_x86_feature(x86_featureset, X86FSET_MCA))
                        cmi_mca_init(hdl);
                CPU->cpu_m.mcpu_cmi_hdl = hdl;
        }
#endif  /* __xpv */

        /*
         * Fake a prom tree such that /dev/openprom continues to work
         */
        PRM_POINT("startup_modules: calling prom_setup...");
        prom_setup();
        PRM_POINT("startup_modules: done");

        /*
         * Load all platform specific modules
         */
        PRM_POINT("startup_modules: calling psm_modload...");
        psm_modload();

        PRM_POINT("startup_modules() done");
}

/*
 * claim a "setaside" boot page for use in the kernel
 */
page_t *
boot_claim_page(pfn_t pfn)
{
        page_t *pp;

        pp = page_numtopp_nolock(pfn);
        ASSERT(pp != NULL);

        if (PP_ISBOOTPAGES(pp)) {
                if (pp->p_next != NULL)
                        pp->p_next->p_prev = pp->p_prev;
                if (pp->p_prev == NULL)
                        bootpages = pp->p_next;
                else
                        pp->p_prev->p_next = pp->p_next;
        } else {
                /*
                 * htable_attach() expects a base pagesize page
                 */
                if (pp->p_szc != 0)
                        page_boot_demote(pp);
                pp = page_numtopp(pfn, SE_EXCL);
        }
        return (pp);
}

/*
 * Walk through the pagetables looking for pages mapped in by boot.  If the
 * setaside flag is set the pages are expected to be returned to the
 * kernel later in boot, so we add them to the bootpages list.
 */
static void
protect_boot_range(uintptr_t low, uintptr_t high, int setaside)
{
        uintptr_t va = low;
        size_t len;
        uint_t prot;
        pfn_t pfn;
        page_t *pp;
        pgcnt_t boot_protect_cnt = 0;

        while (kbm_probe(&va, &len, &pfn, &prot) != 0 && va < high) {
                if (va + len >= high)
                        panic("0x%lx byte mapping at 0x%p exceeds boot's "
                            "legal range.", len, (void *)va);

                while (len > 0) {
                        pp = page_numtopp_alloc(pfn);
                        if (pp != NULL) {
                                if (setaside == 0)
                                        panic("Unexpected mapping by boot.  "
                                            "addr=%p pfn=%lx\n",
                                            (void *)va, pfn);

                                pp->p_next = bootpages;
                                pp->p_prev = NULL;
                                PP_SETBOOTPAGES(pp);
                                if (bootpages != NULL) {
                                        bootpages->p_prev = pp;
                                }
                                bootpages = pp;
                                ++boot_protect_cnt;
                        }

                        ++pfn;
                        len -= MMU_PAGESIZE;
                        va += MMU_PAGESIZE;
                }
        }
        PRM_DEBUG(boot_protect_cnt);
}

/*
 *
 */
static void
layout_kernel_va(void)
{
        PRM_POINT("layout_kernel_va() starting...");
        /*
         * Establish the final size of the kernel's heap, size of segmap,
         * segkp, etc.
         */

#if defined(__amd64)

        kpm_vbase = (caddr_t)segkpm_base;
        if (physmax + 1 < plat_dr_physmax) {
                kpm_size = ROUND_UP_LPAGE(mmu_ptob(plat_dr_physmax));
        } else {
                kpm_size = ROUND_UP_LPAGE(mmu_ptob(physmax + 1));
        }
        if ((uintptr_t)kpm_vbase + kpm_size > (uintptr_t)valloc_base)
                panic("not enough room for kpm!");
        PRM_DEBUG(kpm_size);
        PRM_DEBUG(kpm_vbase);

        /*
         * By default we create a seg_kp in 64 bit kernels, it's a little
         * faster to access than embedding it in the heap.
         */
        segkp_base = (caddr_t)valloc_base + valloc_sz;
        if (!segkp_fromheap) {
                size_t sz = mmu_ptob(segkpsize);

                /*
                 * determine size of segkp
                 */
                if (sz < SEGKPMINSIZE || sz > SEGKPMAXSIZE) {
                        sz = SEGKPDEFSIZE;
                        cmn_err(CE_WARN, "!Illegal value for segkpsize. "
                            "segkpsize has been reset to %ld pages",
                            mmu_btop(sz));
                }
                sz = MIN(sz, MAX(SEGKPMINSIZE, mmu_ptob(physmem)));

                segkpsize = mmu_btop(ROUND_UP_LPAGE(sz));
        }
        PRM_DEBUG(segkp_base);
        PRM_DEBUG(segkpsize);

        /*
         * segzio is used for ZFS cached data. It uses a distinct VA
         * segment (from kernel heap) so that we can easily tell not to
         * include it in kernel crash dumps on 64 bit kernels. The trick is
         * to give it lots of VA, but not constrain the kernel heap.
         * We can use 1.5x physmem for segzio, leaving approximately
         * another 1.5x physmem for heap.  See also the comment in
         * startup_memlist().
         */
        segzio_base = segkp_base + mmu_ptob(segkpsize);
        if (segzio_fromheap) {
                segziosize = 0;
        } else {
                size_t physmem_size = mmu_ptob(physmem);
                size_t size = (segziosize == 0) ?
                    physmem_size * 3 / 2 : mmu_ptob(segziosize);

                if (size < SEGZIOMINSIZE)
                        size = SEGZIOMINSIZE;
                segziosize = mmu_btop(ROUND_UP_LPAGE(size));
        }
        PRM_DEBUG(segziosize);
        PRM_DEBUG(segzio_base);

        /*
         * Put the range of VA for device mappings next, kmdb knows to not
         * grep in this range of addresses.
         */
        toxic_addr =
            ROUND_UP_LPAGE((uintptr_t)segzio_base + mmu_ptob(segziosize));
        PRM_DEBUG(toxic_addr);
        segmap_start = ROUND_UP_LPAGE(toxic_addr + toxic_size);
#else /* __i386 */
        segmap_start = ROUND_UP_LPAGE(kernelbase);
#endif /* __i386 */
        PRM_DEBUG(segmap_start);

        /*
         * Users can change segmapsize through eeprom. If the variable
         * is tuned through eeprom, there is no upper bound on the
         * size of segmap.
         */
        segmapsize = MAX(ROUND_UP_LPAGE(segmapsize), SEGMAPDEFAULT);

#if defined(__i386)
        /*
         * 32-bit systems don't have segkpm or segkp, so segmap appears at
         * the bottom of the kernel's address range.  Set aside space for a
         * small red zone just below the start of segmap.
         */
        segmap_start += KERNEL_REDZONE_SIZE;
        segmapsize -= KERNEL_REDZONE_SIZE;
#endif

        PRM_DEBUG(segmap_start);
        PRM_DEBUG(segmapsize);
        kernelheap = (caddr_t)ROUND_UP_LPAGE(segmap_start + segmapsize);
        PRM_DEBUG(kernelheap);
        PRM_POINT("layout_kernel_va() done...");
}

/*
 * Finish initializing the VM system, now that we are no longer
 * relying on the boot time memory allocators.
 */
static void
startup_vm(void)
{
        struct segmap_crargs a;

        extern int use_brk_lpg, use_stk_lpg;

        PRM_POINT("startup_vm() starting...");

        /*
         * Initialize the hat layer.
         */
        hat_init();

        /*
         * Do final allocations of HAT data structures that need to
         * be allocated before quiescing the boot loader.
         */
        PRM_POINT("Calling hat_kern_alloc()...");
        hat_kern_alloc((caddr_t)segmap_start, segmapsize, ekernelheap);
        PRM_POINT("hat_kern_alloc() done");

#ifndef __xpv
        /*
         * Setup Page Attribute Table
         */
        pat_sync();
#endif

        /*
         * The next two loops are done in distinct steps in order
         * to be sure that any page that is doubly mapped (both above
         * KERNEL_TEXT and below kernelbase) is dealt with correctly.
         * Note this may never happen, but it might someday.
         */
        bootpages = NULL;
        PRM_POINT("Protecting boot pages");

        /*
         * Protect any pages mapped above KERNEL_TEXT that somehow have
         * page_t's. This can only happen if something weird allocated
         * in this range (like kadb/kmdb).
         */
        protect_boot_range(KERNEL_TEXT, (uintptr_t)-1, 0);

        /*
         * Before we can take over memory allocation/mapping from the boot
         * loader we must remove from our free page lists any boot allocated
         * pages that stay mapped until release_bootstrap().
         */
        protect_boot_range(0, kernelbase, 1);


        /*
         * Switch to running on regular HAT (not boot_mmu)
         */
        PRM_POINT("Calling hat_kern_setup()...");
        hat_kern_setup();

        /*
         * It is no longer safe to call BOP_ALLOC(), so make sure we don't.
         */
        bop_no_more_mem();

        PRM_POINT("hat_kern_setup() done");

        hat_cpu_online(CPU);

        /*
         * Initialize VM system
         */
        PRM_POINT("Calling kvm_init()...");
        kvm_init();
        PRM_POINT("kvm_init() done");

        /*
         * Tell kmdb that the VM system is now working
         */
        if (boothowto & RB_DEBUG)
                kdi_dvec_vmready();

#if defined(__xpv)
        /*
         * Populate the I/O pool on domain 0
         */
        if (DOMAIN_IS_INITDOMAIN(xen_info)) {
                extern long populate_io_pool(void);
                long init_io_pool_cnt;

                PRM_POINT("Populating reserve I/O page pool");
                init_io_pool_cnt = populate_io_pool();
                PRM_DEBUG(init_io_pool_cnt);
        }
#endif
        /*
         * Mangle the brand string etc.
         */
        cpuid_pass3(CPU);

#if defined(__amd64)

        /*
         * Create the device arena for toxic (to dtrace/kmdb) mappings.
         */
        device_arena = vmem_create("device", (void *)toxic_addr,
            toxic_size, MMU_PAGESIZE, NULL, NULL, NULL, 0, VM_SLEEP);

#else   /* __i386 */

        /*
         * allocate the bit map that tracks toxic pages
         */
        toxic_bit_map_len = btop((ulong_t)(valloc_base - kernelbase));
        PRM_DEBUG(toxic_bit_map_len);
        toxic_bit_map =
            kmem_zalloc(BT_SIZEOFMAP(toxic_bit_map_len), KM_NOSLEEP);
        ASSERT(toxic_bit_map != NULL);
        PRM_DEBUG(toxic_bit_map);

#endif  /* __i386 */


        /*
         * Now that we've got more VA, as well as the ability to allocate from
         * it, tell the debugger.
         */
        if (boothowto & RB_DEBUG)
                kdi_dvec_memavail();

#if !defined(__xpv)
        /*
         * Map page pfn=0 for drivers, such as kd, that need to pick up
         * parameters left there by controllers/BIOS.
         */
        PRM_POINT("setup up p0_va");
        p0_va = i86devmap(0, 1, PROT_READ);
        PRM_DEBUG(p0_va);
#endif

        cmn_err(CE_CONT, "?mem = %luK (0x%lx)\n",
            physinstalled << (MMU_PAGESHIFT - 10), ptob(physinstalled));

        /*
         * disable automatic large pages for small memory systems or
         * when the disable flag is set.
         *
         * Do not yet consider page sizes larger than 2m/4m.
         */
        if (!auto_lpg_disable && mmu.max_page_level > 0) {
                max_uheap_lpsize = LEVEL_SIZE(1);
                max_ustack_lpsize = LEVEL_SIZE(1);
                max_privmap_lpsize = LEVEL_SIZE(1);
                max_uidata_lpsize = LEVEL_SIZE(1);
                max_utext_lpsize = LEVEL_SIZE(1);
                max_shm_lpsize = LEVEL_SIZE(1);
        }
        if (physmem < privm_lpg_min_physmem || mmu.max_page_level == 0 ||
            auto_lpg_disable) {
                use_brk_lpg = 0;
                use_stk_lpg = 0;
        }
        mcntl0_lpsize = LEVEL_SIZE(mmu.umax_page_level);

        PRM_POINT("Calling hat_init_finish()...");
        hat_init_finish();
        PRM_POINT("hat_init_finish() done");

        /*
         * Initialize the segkp segment type.
         */
        rw_enter(&kas.a_lock, RW_WRITER);
        PRM_POINT("Attaching segkp");
        if (segkp_fromheap) {
                segkp->s_as = &kas;
        } else if (seg_attach(&kas, (caddr_t)segkp_base, mmu_ptob(segkpsize),
            segkp) < 0) {
                panic("startup: cannot attach segkp");
                /*NOTREACHED*/
        }
        PRM_POINT("Doing segkp_create()");
        if (segkp_create(segkp) != 0) {
                panic("startup: segkp_create failed");
                /*NOTREACHED*/
        }
        PRM_DEBUG(segkp);
        rw_exit(&kas.a_lock);

        /*
         * kpm segment
         */
        segmap_kpm = 0;
        if (kpm_desired)
                kpm_init();

        /*
         * Now create segmap segment.
         */
        rw_enter(&kas.a_lock, RW_WRITER);
        if (seg_attach(&kas, (caddr_t)segmap_start, segmapsize, segmap) < 0) {
                panic("cannot attach segmap");
                /*NOTREACHED*/
        }
        PRM_DEBUG(segmap);

        a.prot = PROT_READ | PROT_WRITE;
        a.shmsize = 0;
        a.nfreelist = segmapfreelists;

        if (segmap_create(segmap, (caddr_t)&a) != 0)
                panic("segmap_create segmap");
        rw_exit(&kas.a_lock);

        setup_vaddr_for_ppcopy(CPU);

        segdev_init();
#if defined(__xpv)
        if (DOMAIN_IS_INITDOMAIN(xen_info))
#endif
                pmem_init();

        PRM_POINT("startup_vm() done");
}

/*
 * Load a tod module for the non-standard tod part found on this system.
 */
static void
load_tod_module(char *todmod)
{
        if (modload("tod", todmod) == -1)
                halt("Can't load TOD module");
}

static void
startup_end(void)
{
        int i;
        extern void setx86isalist(void);
        extern void cpu_event_init(void);

        PRM_POINT("startup_end() starting...");

        /*
         * Perform tasks that get done after most of the VM
         * initialization has been done but before the clock
         * and other devices get started.
         */
        kern_setup1();

        /*
         * Perform CPC initialization for this CPU.
         */
        kcpc_hw_init(CPU);

        /*
         * Initialize cpu event framework.
         */
        cpu_event_init();

#if defined(OPTERON_WORKAROUND_6323525)
        if (opteron_workaround_6323525)
                patch_workaround_6323525();
#endif
        /*
         * If needed, load TOD module now so that ddi_get_time(9F) etc. work
         * (For now, "needed" is defined as set tod_module_name in /etc/system)
         */
        if (tod_module_name != NULL) {
                PRM_POINT("load_tod_module()");
                load_tod_module(tod_module_name);
        }

#if defined(__xpv)
        /*
         * Forceload interposing TOD module for the hypervisor.
         */
        PRM_POINT("load_tod_module()");
        load_tod_module("xpvtod");
#endif

        /*
         * Configure the system.
         */
        PRM_POINT("Calling configure()...");
        configure();            /* set up devices */
        PRM_POINT("configure() done");

        /*
         * We can now setup for XSAVE because fpu_probe is done in configure().
         */
        if (fp_save_mech == FP_XSAVE) {
                xsave_setup_msr(CPU);
        }

        /*
         * Set the isa_list string to the defined instruction sets we
         * support.
         */
        setx86isalist();
        cpu_intr_alloc(CPU, NINTR_THREADS);
        psm_install();

        /*
         * We're done with bootops.  We don't unmap the bootstrap yet because
         * we're still using bootsvcs.
         */
        PRM_POINT("NULLing out bootops");
        *bootopsp = (struct bootops *)NULL;
        bootops = (struct bootops *)NULL;

#if defined(__xpv)
        ec_init_debug_irq();
        xs_domu_init();
#endif

#if !defined(__xpv)
        /*
         * Intel IOMMU has been setup/initialized in ddi_impl.c
         * Start it up now.
         */
        immu_startup();

        /*
         * Now that we're no longer going to drop into real mode for a BIOS call
         * via bootops, we can enable PCID (which requires CR0.PG).
         */
        enable_pcid();
#endif

        PRM_POINT("Enabling interrupts");
        (*picinitf)();
        sti();
#if defined(__xpv)
        ASSERT(CPU->cpu_m.mcpu_vcpu_info->evtchn_upcall_mask == 0);
        xen_late_startup();
#endif

        (void) add_avsoftintr((void *)&softlevel1_hdl, 1, softlevel1,
            "softlevel1", NULL, NULL); /* XXX to be moved later */

        /*
         * Register software interrupt handlers for ddi_periodic_add(9F).
         * Software interrupts up to the level 10 are supported.
         */
        for (i = DDI_IPL_1; i <= DDI_IPL_10; i++) {
                (void) add_avsoftintr((void *)&softlevel_hdl[i-1], i,
                    (avfunc)ddi_periodic_softintr, "ddi_periodic",
                    (caddr_t)(uintptr_t)i, NULL);
        }

#if !defined(__xpv)
        if (modload("drv", "amd_iommu") < 0) {
                PRM_POINT("No AMD IOMMU present\n");
        } else if (ddi_hold_installed_driver(ddi_name_to_major(
            "amd_iommu")) == NULL) {
                prom_printf("ERROR: failed to attach AMD IOMMU\n");
        }
#endif
        post_startup_cpu_fixups();

        PRM_POINT("startup_end() done");
}

/*
 * Don't remove the following 2 variables.  They are necessary
 * for reading the hostid from the legacy file (/kernel/misc/sysinit).
 */
char *_hs1107 = hw_serial;
ulong_t  _bdhs34;

void
post_startup(void)
{
        extern void cpupm_init(cpu_t *);
        extern void cpu_event_init_cpu(cpu_t *);

        /*
         * Set the system wide, processor-specific flags to be passed
         * to userland via the aux vector for performance hints and
         * instruction set extensions.
         */
        bind_hwcap();

#ifdef __xpv
        if (DOMAIN_IS_INITDOMAIN(xen_info))
#endif
        {
#if defined(__xpv)
                xpv_panic_init();
#else
                /*
                 * Startup the memory scrubber.
                 * XXPV This should be running somewhere ..
                 */
                if ((get_hwenv() & HW_VIRTUAL) == 0)
                        memscrub_init();
#endif
        }

        /*
         * Complete CPU module initialization
         */
        cmi_post_startup();

        /*
         * Perform forceloading tasks for /etc/system.
         */
        (void) mod_sysctl(SYS_FORCELOAD, NULL);

        /*
         * ON4.0: Force /proc module in until clock interrupt handle fixed
         * ON4.0: This must be fixed or restated in /etc/systems.
         */
        (void) modload("fs", "procfs");

        (void) i_ddi_attach_hw_nodes("pit_beep");

#if defined(__i386)
        /*
         * Check for required functional Floating Point hardware,
         * unless FP hardware explicitly disabled.
         */
        if (fpu_exists && (fpu_pentium_fdivbug || fp_kind == FP_NO))
                halt("No working FP hardware found");
#endif

        maxmem = freemem;

        cpu_event_init_cpu(CPU);
        cpupm_init(CPU);
        (void) mach_cpu_create_device_node(CPU, NULL);

        pg_init();
}

static int
pp_in_range(page_t *pp, uint64_t low_addr, uint64_t high_addr)
{
        return ((pp->p_pagenum >= btop(low_addr)) &&
            (pp->p_pagenum < btopr(high_addr)));
}

static int
pp_in_module(page_t *pp, const rd_existing_t *modranges)
{
        uint_t i;

        for (i = 0; modranges[i].phys != 0; i++) {
                if (pp_in_range(pp, modranges[i].phys,
                    modranges[i].phys + modranges[i].size))
                        return (1);
        }

        return (0);
}

void
release_bootstrap(void)
{
        int root_is_ramdisk;
        page_t *pp;
        extern void kobj_boot_unmountroot(void);
        extern dev_t rootdev;
        uint_t i;
        char propname[32];
        rd_existing_t *modranges;
#if !defined(__xpv)
        pfn_t   pfn;
#endif

        /*
         * Save the bootfs module ranges so that we can reserve them below
         * for the real bootfs.
         */
        modranges = kmem_alloc(sizeof (rd_existing_t) * MAX_BOOT_MODULES,
            KM_SLEEP);
        for (i = 0; ; i++) {
                uint64_t start, size;

                modranges[i].phys = 0;

                (void) snprintf(propname, sizeof (propname),
                    "module-addr-%u", i);
                if (do_bsys_getproplen(NULL, propname) <= 0)
                        break;
                (void) do_bsys_getprop(NULL, propname, &start);

                (void) snprintf(propname, sizeof (propname),
                    "module-size-%u", i);
                if (do_bsys_getproplen(NULL, propname) <= 0)
                        break;
                (void) do_bsys_getprop(NULL, propname, &size);

                modranges[i].phys = start;
                modranges[i].size = size;
        }

        /* unmount boot ramdisk and release kmem usage */
        kobj_boot_unmountroot();

        /*
         * We're finished using the boot loader so free its pages.
         */
        PRM_POINT("Unmapping lower boot pages");

        clear_boot_mappings(0, _userlimit);

        postbootkernelbase = kernelbase;

        /*
         * If root isn't on ramdisk, destroy the hardcoded
         * ramdisk node now and release the memory. Else,
         * ramdisk memory is kept in rd_pages.
         */
        root_is_ramdisk = (getmajor(rootdev) == ddi_name_to_major("ramdisk"));
        if (!root_is_ramdisk) {
                dev_info_t *dip = ddi_find_devinfo("ramdisk", -1, 0);
                ASSERT(dip && ddi_get_parent(dip) == ddi_root_node());
                ndi_rele_devi(dip);     /* held from ddi_find_devinfo */
                (void) ddi_remove_child(dip, 0);
        }

        PRM_POINT("Releasing boot pages");
        while (bootpages) {
                extern uint64_t ramdisk_start, ramdisk_end;
                pp = bootpages;
                bootpages = pp->p_next;


                /* Keep pages for the lower 64K */
                if (pp_in_range(pp, 0, 0x40000)) {
                        pp->p_next = lower_pages;
                        lower_pages = pp;
                        lower_pages_count++;
                        continue;
                }

                if (root_is_ramdisk && pp_in_range(pp, ramdisk_start,
                    ramdisk_end) || pp_in_module(pp, modranges)) {
                        pp->p_next = rd_pages;
                        rd_pages = pp;
                        continue;
                }
                pp->p_next = (struct page *)0;
                pp->p_prev = (struct page *)0;
                PP_CLRBOOTPAGES(pp);
                page_free(pp, 1);
        }
        PRM_POINT("Boot pages released");

        kmem_free(modranges, sizeof (rd_existing_t) * 99);

#if !defined(__xpv)
/* XXPV -- note this following bunch of code needs to be revisited in Xen 3.0 */
        /*
         * Find 1 page below 1 MB so that other processors can boot up or
         * so that any processor can resume.
         * Make sure it has a kernel VA as well as a 1:1 mapping.
         * We should have just free'd one up.
         */

        /*
         * 0x10 pages is 64K.  Leave the bottom 64K alone
         * for BIOS.
         */
        for (pfn = 0x10; pfn < btop(1*1024*1024); pfn++) {
                if (page_numtopp_alloc(pfn) == NULL)
                        continue;
                rm_platter_va = i86devmap(pfn, 1,
                    PROT_READ | PROT_WRITE | PROT_EXEC);
                rm_platter_pa = ptob(pfn);
                break;
        }
        if (pfn == btop(1*1024*1024) && use_mp)
                panic("No page below 1M available for starting "
                    "other processors or for resuming from system-suspend");
#endif  /* !__xpv */
}

/*
 * Initialize the platform-specific parts of a page_t.
 */
void
add_physmem_cb(page_t *pp, pfn_t pnum)
{
        pp->p_pagenum = pnum;
        pp->p_mapping = NULL;
        pp->p_embed = 0;
        pp->p_share = 0;
        pp->p_mlentry = 0;
}

/*
 * kphysm_init() initializes physical memory.
 */
static pgcnt_t
kphysm_init(
        page_t *pp,
        pgcnt_t npages)
{
        struct memlist  *pmem;
        struct memseg   *cur_memseg;
        pfn_t           base_pfn;
        pfn_t           end_pfn;
        pgcnt_t         num;
        pgcnt_t         pages_done = 0;
        uint64_t        addr;
        uint64_t        size;
        extern pfn_t    ddiphysmin;
        extern int      mnode_xwa;
        int             ms = 0, me = 0;

        ASSERT(page_hash != NULL && page_hashsz != 0);

        cur_memseg = memseg_base;
        for (pmem = phys_avail; pmem && npages; pmem = pmem->ml_next) {
                /*
                 * In a 32 bit kernel can't use higher memory if we're
                 * not booting in PAE mode. This check takes care of that.
                 */
                addr = pmem->ml_address;
                size = pmem->ml_size;
                if (btop(addr) > physmax)
                        continue;

                /*
                 * align addr and size - they may not be at page boundaries
                 */
                if ((addr & MMU_PAGEOFFSET) != 0) {
                        addr += MMU_PAGEOFFSET;
                        addr &= ~(uint64_t)MMU_PAGEOFFSET;
                        size -= addr - pmem->ml_address;
                }

                /* only process pages below or equal to physmax */
                if ((btop(addr + size) - 1) > physmax)
                        size = ptob(physmax - btop(addr) + 1);

                num = btop(size);
                if (num == 0)
                        continue;

                if (num > npages)
                        num = npages;

                npages -= num;
                pages_done += num;
                base_pfn = btop(addr);

                if (prom_debug)
                        prom_printf("MEMSEG addr=0x%" PRIx64
                            " pgs=0x%lx pfn 0x%lx-0x%lx\n",
                            addr, num, base_pfn, base_pfn + num);

                /*
                 * Ignore pages below ddiphysmin to simplify ddi memory
                 * allocation with non-zero addr_lo requests.
                 */
                if (base_pfn < ddiphysmin) {
                        if (base_pfn + num <= ddiphysmin)
                                continue;
                        pp += (ddiphysmin - base_pfn);
                        num -= (ddiphysmin - base_pfn);
                        base_pfn = ddiphysmin;
                }

                /*
                 * mnode_xwa is greater than 1 when large pages regions can
                 * cross memory node boundaries. To prevent the formation
                 * of these large pages, configure the memsegs based on the
                 * memory node ranges which had been made non-contiguous.
                 */
                if (mnode_xwa > 1) {

                        end_pfn = base_pfn + num - 1;
                        ms = PFN_2_MEM_NODE(base_pfn);
                        me = PFN_2_MEM_NODE(end_pfn);

                        if (ms != me) {
                                /*
                                 * current range spans more than 1 memory node.
                                 * Set num to only the pfn range in the start
                                 * memory node.
                                 */
                                num = mem_node_config[ms].physmax - base_pfn
                                    + 1;
                                ASSERT(end_pfn > mem_node_config[ms].physmax);
                        }
                }

                for (;;) {
                        /*
                         * Build the memsegs entry
                         */
                        cur_memseg->pages = pp;
                        cur_memseg->epages = pp + num;
                        cur_memseg->pages_base = base_pfn;
                        cur_memseg->pages_end = base_pfn + num;

                        /*
                         * Insert into memseg list in decreasing pfn range
                         * order. Low memory is typically more fragmented such
                         * that this ordering keeps the larger ranges at the
                         * front of the list for code that searches memseg.
                         * This ASSERTS that the memsegs coming in from boot
                         * are in increasing physical address order and not
                         * contiguous.
                         */
                        if (memsegs != NULL) {
                                ASSERT(cur_memseg->pages_base >=
                                    memsegs->pages_end);
                                cur_memseg->next = memsegs;
                        }
                        memsegs = cur_memseg;

                        /*
                         * add_physmem() initializes the PSM part of the page
                         * struct by calling the PSM back with add_physmem_cb().
                         * In addition it coalesces pages into larger pages as
                         * it initializes them.
                         */
                        add_physmem(pp, num, base_pfn);
                        cur_memseg++;
                        availrmem_initial += num;
                        availrmem += num;

                        pp += num;
                        if (ms >= me)
                                break;

                        /* process next memory node range */
                        ms++;
                        base_pfn = mem_node_config[ms].physbase;
                        num = MIN(mem_node_config[ms].physmax,
                            end_pfn) - base_pfn + 1;
                }
        }

        PRM_DEBUG(availrmem_initial);
        PRM_DEBUG(availrmem);
        PRM_DEBUG(freemem);
        build_pfn_hash();
        return (pages_done);
}

/*
 * Kernel VM initialization.
 */
static void
kvm_init(void)
{
        ASSERT((((uintptr_t)s_text) & MMU_PAGEOFFSET) == 0);

        /*
         * Put the kernel segments in kernel address space.
         */
        rw_enter(&kas.a_lock, RW_WRITER);
        as_avlinit(&kas);

        (void) seg_attach(&kas, s_text, e_moddata - s_text, &ktextseg);
        (void) segkmem_create(&ktextseg);

        (void) seg_attach(&kas, (caddr_t)valloc_base, valloc_sz, &kvalloc);
        (void) segkmem_create(&kvalloc);

        (void) seg_attach(&kas, kernelheap,
            ekernelheap - kernelheap, &kvseg);
        (void) segkmem_create(&kvseg);

        if (core_size > 0) {
                PRM_POINT("attaching kvseg_core");
                (void) seg_attach(&kas, (caddr_t)core_base, core_size,
                    &kvseg_core);
                (void) segkmem_create(&kvseg_core);
        }

        if (segziosize > 0) {
                PRM_POINT("attaching segzio");
                (void) seg_attach(&kas, segzio_base, mmu_ptob(segziosize),
                    &kzioseg);
                (void) segkmem_zio_create(&kzioseg);

                /* create zio area covering new segment */
                segkmem_zio_init(segzio_base, mmu_ptob(segziosize));
        }

        (void) seg_attach(&kas, kdi_segdebugbase, kdi_segdebugsize, &kdebugseg);
        (void) segkmem_create(&kdebugseg);

        rw_exit(&kas.a_lock);

        /*
         * Ensure that the red zone at kernelbase is never accessible.
         */
        PRM_POINT("protecting redzone");
        (void) as_setprot(&kas, (caddr_t)kernelbase, KERNEL_REDZONE_SIZE, 0);

        /*
         * Make the text writable so that it can be hot patched by DTrace.
         */
        (void) as_setprot(&kas, s_text, e_modtext - s_text,
            PROT_READ | PROT_WRITE | PROT_EXEC);

        /*
         * Make data writable until end.
         */
        (void) as_setprot(&kas, s_data, e_moddata - s_data,
            PROT_READ | PROT_WRITE | PROT_EXEC);
}

#ifndef __xpv
/*
 * Solaris adds an entry for Write Combining caching to the PAT
 */
static uint64_t pat_attr_reg = PAT_DEFAULT_ATTRIBUTE;

void
pat_sync(void)
{
        ulong_t cr0, cr0_orig, cr4;

        if (!is_x86_feature(x86_featureset, X86FSET_PAT))
                return;
        cr0_orig = cr0 = getcr0();
        cr4 = getcr4();

        /* disable caching and flush all caches and TLBs */
        cr0 |= CR0_CD;
        cr0 &= ~CR0_NW;
        setcr0(cr0);
        invalidate_cache();
        if (cr4 & CR4_PGE) {
                setcr4(cr4 & ~(ulong_t)CR4_PGE);
                setcr4(cr4);
        } else {
                reload_cr3();
        }

        /* add our entry to the PAT */
        wrmsr(REG_PAT, pat_attr_reg);

        /* flush TLBs and cache again, then reenable cr0 caching */
        if (cr4 & CR4_PGE) {
                setcr4(cr4 & ~(ulong_t)CR4_PGE);
                setcr4(cr4);
        } else {
                reload_cr3();
        }
        invalidate_cache();
        setcr0(cr0_orig);
}

#endif /* !__xpv */

#if defined(_SOFT_HOSTID)
/*
 * On platforms that do not have a hardware serial number, attempt
 * to set one based on the contents of /etc/hostid.  If this file does
 * not exist, assume that we are to generate a new hostid and set
 * it in the kernel, for subsequent saving by a userland process
 * once the system is up and the root filesystem is mounted r/w.
 *
 * In order to gracefully support upgrade on OpenSolaris, if
 * /etc/hostid does not exist, we will attempt to get a serial number
 * using the legacy method (/kernel/misc/sysinit).
 *
 * If that isn't present, we attempt to use an SMBIOS UUID, which is
 * a hardware serial number.  Note that we don't automatically trust
 * all SMBIOS UUIDs (some older platforms are defective and ship duplicate
 * UUIDs in violation of the standard), we check against a blacklist.
 *
 * In an attempt to make the hostid less prone to abuse
 * (for license circumvention, etc), we store it in /etc/hostid
 * in rot47 format.
 */
extern volatile unsigned long tenmicrodata;
static int atoi(char *);

/*
 * Set this to non-zero in /etc/system if you think your SMBIOS returns a
 * UUID that is not unique. (Also report it so that the smbios_uuid_blacklist
 * array can be updated.)
 */
int smbios_broken_uuid = 0;

/*
 * List of known bad UUIDs.  This is just the lower 32-bit values, since
 * that's what we use for the host id.  If your hostid falls here, you need
 * to contact your hardware OEM for a fix for your BIOS.
 */
static unsigned char
smbios_uuid_blacklist[][16] = {

        {       /* Reported bad UUID (Google search) */
                0x00, 0x02, 0x00, 0x03, 0x00, 0x04, 0x00, 0x05,
                0x00, 0x06, 0x00, 0x07, 0x00, 0x08, 0x00, 0x09,
        },
        {       /* Known bad DELL UUID */
                0x4C, 0x4C, 0x45, 0x44, 0x00, 0x00, 0x20, 0x10,
                0x80, 0x20, 0x80, 0xC0, 0x4F, 0x20, 0x20, 0x20,
        },
        {       /* Uninitialized flash */
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
        },
        {       /* All zeros */
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
        },
};

static int32_t
uuid_to_hostid(const uint8_t *uuid)
{
        /*
         * Although the UUIDs are 128-bits, they may not distribute entropy
         * evenly.  We would like to use SHA or MD5, but those are located
         * in loadable modules and not available this early in boot.  As we
         * don't need the values to be cryptographically strong, we just
         * generate 32-bit vaue by xor'ing the various sequences together,
         * which ensures that the entire UUID contributes to the hostid.
         */
        uint32_t        id = 0;

        /* first check against the blacklist */
        for (int i = 0; i < (sizeof (smbios_uuid_blacklist) / 16); i++) {
                if (bcmp(smbios_uuid_blacklist[0], uuid, 16) == 0) {
                        cmn_err(CE_CONT, "?Broken SMBIOS UUID. "
                            "Contact BIOS manufacturer for repair.\n");
                        return ((int32_t)HW_INVALID_HOSTID);
                }
        }

        for (int i = 0; i < 16; i++)
                id ^= ((uuid[i]) << (8 * (i % sizeof (id))));

        /* Make sure return value is positive */
        return (id & 0x7fffffff);
}

static int32_t
set_soft_hostid(void)
{
        struct _buf *file;
        char tokbuf[MAXNAMELEN];
        token_t token;
        int done = 0;
        u_longlong_t tmp;
        int i;
        int32_t hostid = (int32_t)HW_INVALID_HOSTID;
        unsigned char *c;
        hrtime_t tsc;
        smbios_system_t smsys;

        /*
         * If /etc/hostid file not found, we'd like to get a pseudo
         * random number to use at the hostid.  A nice way to do this
         * is to read the real time clock.  To remain xen-compatible,
         * we can't poke the real hardware, so we use tsc_read() to
         * read the real time clock.  However, there is an ominous
         * warning in tsc_read that says it can return zero, so we
         * deal with that possibility by falling back to using the
         * (hopefully random enough) value in tenmicrodata.
         */

        if ((file = kobj_open_file(hostid_file)) == (struct _buf *)-1) {
                /*
                 * hostid file not found - try to load sysinit module
                 * and see if it has a nonzero hostid value...use that
                 * instead of generating a new hostid here if so.
                 */
                if ((i = modload("misc", "sysinit")) != -1) {
                        if (strlen(hw_serial) > 0)
                                hostid = (int32_t)atoi(hw_serial);
                        (void) modunload(i);
                }

                /*
                 * We try to use the SMBIOS UUID. But not if it is blacklisted
                 * in /etc/system.
                 */
                if ((hostid == HW_INVALID_HOSTID) &&
                    (smbios_broken_uuid == 0) &&
                    (ksmbios != NULL) &&
                    (smbios_info_system(ksmbios, &smsys) != SMB_ERR) &&
                    (smsys.smbs_uuidlen >= 16)) {
                        hostid = uuid_to_hostid(smsys.smbs_uuid);
                }

                /*
                 * Generate a "random" hostid using the clock.  These
                 * hostids will change on each boot if the value is not
                 * saved to a persistent /etc/hostid file.
                 */
                if (hostid == HW_INVALID_HOSTID) {
                        tsc = tsc_read();
                        if (tsc == 0)   /* tsc_read can return zero sometimes */
                                hostid = (int32_t)tenmicrodata & 0x0CFFFFF;
                        else
                                hostid = (int32_t)tsc & 0x0CFFFFF;
                }
        } else {
                /* hostid file found */
                while (!done) {
                        token = kobj_lex(file, tokbuf, sizeof (tokbuf));

                        switch (token) {
                        case POUND:
                                /*
                                 * skip comments
                                 */
                                kobj_find_eol(file);
                                break;
                        case STRING:
                                /*
                                 * un-rot47 - obviously this
                                 * nonsense is ascii-specific
                                 */
                                for (c = (unsigned char *)tokbuf;
                                    *c != '\0'; c++) {
                                        *c += 47;
                                        if (*c > '~')
                                                *c -= 94;
                                        else if (*c < '!')
                                                *c += 94;
                                }
                                /*
                                 * now we should have a real number
                                 */

                                if (kobj_getvalue(tokbuf, &tmp) != 0)
                                        kobj_file_err(CE_WARN, file,
                                            "Bad value %s for hostid",
                                            tokbuf);
                                else
                                        hostid = (int32_t)tmp;

                                break;
                        case EOF:
                                done = 1;
                                /* FALLTHROUGH */
                        case NEWLINE:
                                kobj_newline(file);
                                break;
                        default:
                                break;

                        }
                }
                if (hostid == HW_INVALID_HOSTID) /* didn't find a hostid */
                        kobj_file_err(CE_WARN, file,
                            "hostid missing or corrupt");

                kobj_close_file(file);
        }
        /*
         * hostid is now the value read from /etc/hostid, or the
         * new hostid we generated in this routine or HW_INVALID_HOSTID if not
         * set.
         */
        return (hostid);
}

static int
atoi(char *p)
{
        int i = 0;

        while (*p != '\0')
                i = 10 * i + (*p++ - '0');

        return (i);
}

#endif /* _SOFT_HOSTID */

void
get_system_configuration(void)
{
        char    prop[32];
        u_longlong_t nodes_ll, cpus_pernode_ll, lvalue;

        if (BOP_GETPROPLEN(bootops, "nodes") > sizeof (prop) ||
            BOP_GETPROP(bootops, "nodes", prop) < 0 ||
            kobj_getvalue(prop, &nodes_ll) == -1 ||
            nodes_ll > MAXNODES ||
            BOP_GETPROPLEN(bootops, "cpus_pernode") > sizeof (prop) ||
            BOP_GETPROP(bootops, "cpus_pernode", prop) < 0 ||
            kobj_getvalue(prop, &cpus_pernode_ll) == -1) {
                system_hardware.hd_nodes = 1;
                system_hardware.hd_cpus_per_node = 0;
        } else {
                system_hardware.hd_nodes = (int)nodes_ll;
                system_hardware.hd_cpus_per_node = (int)cpus_pernode_ll;
        }

        if (BOP_GETPROPLEN(bootops, "kernelbase") > sizeof (prop) ||
            BOP_GETPROP(bootops, "kernelbase", prop) < 0 ||
            kobj_getvalue(prop, &lvalue) == -1)
                eprom_kernelbase = NULL;
        else
                eprom_kernelbase = (uintptr_t)lvalue;

        if (BOP_GETPROPLEN(bootops, "segmapsize") > sizeof (prop) ||
            BOP_GETPROP(bootops, "segmapsize", prop) < 0 ||
            kobj_getvalue(prop, &lvalue) == -1)
                segmapsize = SEGMAPDEFAULT;
        else
                segmapsize = (uintptr_t)lvalue;

        if (BOP_GETPROPLEN(bootops, "segmapfreelists") > sizeof (prop) ||
            BOP_GETPROP(bootops, "segmapfreelists", prop) < 0 ||
            kobj_getvalue(prop, &lvalue) == -1)
                segmapfreelists = 0;    /* use segmap driver default */
        else
                segmapfreelists = (int)lvalue;

        /* physmem used to be here, but moved much earlier to fakebop.c */
}

/*
 * Add to a memory list.
 * start = start of new memory segment
 * len = length of new memory segment in bytes
 * new = pointer to a new struct memlist
 * memlistp = memory list to which to add segment.
 */
void
memlist_add(
        uint64_t start,
        uint64_t len,
        struct memlist *new,
        struct memlist **memlistp)
{
        struct memlist *cur;
        uint64_t end = start + len;

        new->ml_address = start;
        new->ml_size = len;

        cur = *memlistp;

        while (cur) {
                if (cur->ml_address >= end) {
                        new->ml_next = cur;
                        *memlistp = new;
                        new->ml_prev = cur->ml_prev;
                        cur->ml_prev = new;
                        return;
                }
                ASSERT(cur->ml_address + cur->ml_size <= start);
                if (cur->ml_next == NULL) {
                        cur->ml_next = new;
                        new->ml_prev = cur;
                        new->ml_next = NULL;
                        return;
                }
                memlistp = &cur->ml_next;
                cur = cur->ml_next;
        }
}

void
kobj_vmem_init(vmem_t **text_arena, vmem_t **data_arena)
{
        size_t tsize = e_modtext - modtext;
        size_t dsize = e_moddata - moddata;

        *text_arena = vmem_create("module_text", tsize ? modtext : NULL, tsize,
            1, segkmem_alloc, segkmem_free, heaptext_arena, 0, VM_SLEEP);
        *data_arena = vmem_create("module_data", dsize ? moddata : NULL, dsize,
            1, segkmem_alloc, segkmem_free, heap32_arena, 0, VM_SLEEP);
}

caddr_t
kobj_text_alloc(vmem_t *arena, size_t size)
{
        return (vmem_alloc(arena, size, VM_SLEEP | VM_BESTFIT));
}

/*ARGSUSED*/
caddr_t
kobj_texthole_alloc(caddr_t addr, size_t size)
{
        panic("unexpected call to kobj_texthole_alloc()");
        /*NOTREACHED*/
        return (0);
}

/*ARGSUSED*/
void
kobj_texthole_free(caddr_t addr, size_t size)
{
        panic("unexpected call to kobj_texthole_free()");
}

/*
 * This is called just after configure() in startup().
 *
 * The ISALIST concept is a bit hopeless on Intel, because
 * there's no guarantee of an ever-more-capable processor
 * given that various parts of the instruction set may appear
 * and disappear between different implementations.
 *
 * While it would be possible to correct it and even enhance
 * it somewhat, the explicit hardware capability bitmask allows
 * more flexibility.
 *
 * So, we just leave this alone.
 */
void
setx86isalist(void)
{
        char *tp;
        size_t len;
        extern char *isa_list;

#define TBUFSIZE        1024

        tp = kmem_alloc(TBUFSIZE, KM_SLEEP);
        *tp = '\0';

#if defined(__amd64)
        (void) strcpy(tp, "amd64 ");
#endif

        switch (x86_vendor) {
        case X86_VENDOR_Intel:
        case X86_VENDOR_AMD:
        case X86_VENDOR_TM:
                if (is_x86_feature(x86_featureset, X86FSET_CMOV)) {
                        /*
                         * Pentium Pro or later
                         */
                        (void) strcat(tp, "pentium_pro");
                        (void) strcat(tp,
                            is_x86_feature(x86_featureset, X86FSET_MMX) ?
                            "+mmx pentium_pro " : " ");
                }
                /*FALLTHROUGH*/
        case X86_VENDOR_Cyrix:
                /*
                 * The Cyrix 6x86 does not have any Pentium features
                 * accessible while not at privilege level 0.
                 */
                if (is_x86_feature(x86_featureset, X86FSET_CPUID)) {
                        (void) strcat(tp, "pentium");
                        (void) strcat(tp,
                            is_x86_feature(x86_featureset, X86FSET_MMX) ?
                            "+mmx pentium " : " ");
                }
                break;
        default:
                break;
        }
        (void) strcat(tp, "i486 i386 i86");
        len = strlen(tp) + 1;   /* account for NULL at end of string */
        isa_list = strcpy(kmem_alloc(len, KM_SLEEP), tp);
        kmem_free(tp, TBUFSIZE);

#undef TBUFSIZE
}


#ifdef __amd64

void *
device_arena_alloc(size_t size, int vm_flag)
{
        return (vmem_alloc(device_arena, size, vm_flag));
}

void
device_arena_free(void *vaddr, size_t size)
{
        vmem_free(device_arena, vaddr, size);
}

#else /* __i386 */

void *
device_arena_alloc(size_t size, int vm_flag)
{
        caddr_t vaddr;
        uintptr_t v;
        size_t  start;
        size_t  end;

        vaddr = vmem_alloc(heap_arena, size, vm_flag);
        if (vaddr == NULL)
                return (NULL);

        v = (uintptr_t)vaddr;
        ASSERT(v >= kernelbase);
        ASSERT(v + size <= valloc_base);

        start = btop(v - kernelbase);
        end = btop(v + size - 1 - kernelbase);
        ASSERT(start < toxic_bit_map_len);
        ASSERT(end < toxic_bit_map_len);

        while (start <= end) {
                BT_ATOMIC_SET(toxic_bit_map, start);
                ++start;
        }
        return (vaddr);
}

void
device_arena_free(void *vaddr, size_t size)
{
        uintptr_t v = (uintptr_t)vaddr;
        size_t  start;
        size_t  end;

        ASSERT(v >= kernelbase);
        ASSERT(v + size <= valloc_base);

        start = btop(v - kernelbase);
        end = btop(v + size - 1 - kernelbase);
        ASSERT(start < toxic_bit_map_len);
        ASSERT(end < toxic_bit_map_len);

        while (start <= end) {
                ASSERT(BT_TEST(toxic_bit_map, start) != 0);
                BT_ATOMIC_CLEAR(toxic_bit_map, start);
                ++start;
        }
        vmem_free(heap_arena, vaddr, size);
}

/*
 * returns 1st address in range that is in device arena, or NULL
 * if len is not NULL it returns the length of the toxic range
 */
void *
device_arena_contains(void *vaddr, size_t size, size_t *len)
{
        uintptr_t v = (uintptr_t)vaddr;
        uintptr_t eaddr = v + size;
        size_t start;
        size_t end;

        /*
         * if called very early by kmdb, just return NULL
         */
        if (toxic_bit_map == NULL)
                return (NULL);

        /*
         * First check if we're completely outside the bitmap range.
         */
        if (v >= valloc_base || eaddr < kernelbase)
                return (NULL);

        /*
         * Trim ends of search to look at only what the bitmap covers.
         */
        if (v < kernelbase)
                v = kernelbase;
        start = btop(v - kernelbase);
        end = btop(eaddr - kernelbase);
        if (end >= toxic_bit_map_len)
                end = toxic_bit_map_len;

        if (bt_range(toxic_bit_map, &start, &end, end) == 0)
                return (NULL);

        v = kernelbase + ptob(start);
        if (len != NULL)
                *len = ptob(end - start);
        return ((void *)v);
}

#endif  /* __i386 */