i86pc/os/fakebop.c

	fakebop.c revision 72a8557dc57a8bf59d6df917b4d839d5cc86d329
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2010, Intel Corporation.
 * All rights reserved.
 *
 * Copyright 2013 Joyent, Inc.  All rights reserved.
 */

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

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

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

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

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

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

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

/*
 * buffer for vsnprintf for console I/O
 */
#define BUFFERSIZE  512
static char buffer[BUFFERSIZE];
/*
 * stuff to store/report/manipulate boot property settings.
 */
typedef struct bootprop {
    struct bootprop *bp_next;
    char *bp_name;
    uint_t bp_vlen;
    char *bp_value;
} bootprop_t;

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

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

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

static void build_firmware_properties(void);

static int early_allocation = 1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    if (strstr((char *)xbootp->bi_cmdline, "prom_debug") || kbm_debug) {
        value = line;
        bop_printf(NULL, "\nBoot properties:\n");
        name = "";
        while ((name = do_bsys_nextprop(NULL, name)) != NULL) {
            bop_printf(NULL, "\t0x%p %s = ", (void *)name, name);
            (void) do_bsys_getprop(NULL, name, value);
            v_len = do_bsys_getproplen(NULL, name);
            bop_printf(NULL, "len=%d ", v_len);
            value[v_len] = 0;
            bop_printf(NULL, "%s\n", value);
        }
    }
}

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

    if (have_console == 0)
        return;

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

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

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

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

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

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

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

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

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

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

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

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

static char *whoami;

#define BUFLEN  64

#if defined(__xpv)

static char namebuf[32];

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

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

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

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

#define VBDPATHLEN  64

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

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

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

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

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

    xen_parse_props(s, prop_map, n_prop);

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

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

    xen_parse_props(s, prop_map, n_prop);

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

#else   /* __xpv */

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

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

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

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

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

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

#endif  /* __xpv */

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

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

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


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

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

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

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

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


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

#ifndef __xpv
    /*
     * set the BIOS boot device from GRUB
     */
    netboot = 0;
    mbi = xbp->bi_mb_info;

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

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

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

    /*
     * In the netboot case, drives_info is overloaded with the dhcp ack.
     * This is not multiboot compliant and requires special pxegrub!
     */
    if (netboot && mbi->drives_length != 0) {
        sip = (struct sol_netinfo *)(uintptr_t)mbi->drives_addr;
        if (sip->sn_infotype == SN_TYPE_BOOTP)
            bsetprop("bootp-response", sizeof ("bootp-response"),
                (void *)(uintptr_t)mbi->drives_addr,
                mbi->drives_length);
        else if (sip->sn_infotype == SN_TYPE_RARP)
            setup_rarp_props(sip);
    }
    bsetprop("stdout", strlen("stdout"),
        &stdout_val, sizeof (stdout_val));
#endif /* __xpv */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

extern void bop_trap_handler(void);

static gate_desc_t *bop_idt;

static desctbr_t bop_idt_info;

static void
bop_idt_init(void)
{
    int t;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        value = do_bsys_alloc(NULL, NULL, MMU_PAGESIZE, MMU_PAGESIZE);
        bop_printf(NULL, "\nBoot properties:\n");
        name = "";
        while ((name = do_bsys_nextprop(NULL, name)) != NULL) {
            bop_printf(NULL, "\t0x%p %s = ", (void *)name, name);
            (void) do_bsys_getprop(NULL, name, value);
            len = do_bsys_getproplen(NULL, name);
            bop_printf(NULL, "len=%d ", len);
            value[len] = 0;
            for (cp = value; *cp; ++cp) {
                if (' ' <= *cp && *cp <= '~')
                    bop_printf(NULL, "%c", *cp);
                else
                    bop_printf(NULL, "-0x%x-", *cp);
            }
            bop_printf(NULL, "\n");
        }
    }

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


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

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

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


/*
 * Set ACPI firmware properties
 */

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

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

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

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

    return (sum);
}

static int
valid_rsdp(ACPI_TABLE_RSDP *rp)
{

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

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

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

    return (1);
}

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

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

        ptr += ACPI_RSDP_SCAN_STEP;
        len -= ACPI_RSDP_SCAN_STEP;
    }

    return (NULL);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    if (tp == NULL)
        return;

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

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

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

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

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

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

static void
process_slit(ACPI_TABLE_SLIT *tp)
{

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

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

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

    ASSERT(tp != NULL);

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

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

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

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

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

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

    return (tp);
}

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

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

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

    bsetpropsi(BOOT_NCPUS_NAME, max_id+1);

}
#endif /* __xpv */

static void
build_firmware_properties(void)
{
    ACPI_TABLE_HEADER *tp = NULL;

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

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

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

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

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

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

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

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

#define BP_MAX_STRLEN   32

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

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

    if (prop_value)
        *prop_value = value;

    return (0);
}