i386/loader/main.c

/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * MD bootstrap main() and assorted miscellaneous
 * commands.
 */

#include <stand.h>
#include <stddef.h>
#include <string.h>
#include <machine/bootinfo.h>
#include <machine/cpufunc.h>
#include <machine/psl.h>
#include <sys/reboot.h>

#include "bootstrap.h"
#include "common/bootargs.h"
#include "libi386/libi386.h"
#include "libi386/smbios.h"
#include "btxv86.h"

#ifdef LOADER_ZFS_SUPPORT
#include "../zfs/libzfs.h"
#endif

CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);

/* Arguments passed in from the boot1/boot2 loader */
static struct bootargs *kargs;

static u_int32_t    initial_howto;
static u_int32_t    initial_bootdev;
static struct bootinfo  *initial_bootinfo;

struct arch_switch  archsw;     /* MI/MD interface boundary */

static void     extract_currdev(void);
static int      isa_inb(int port);
static void     isa_outb(int port, int value);
void            exit(int code);
#ifdef LOADER_ZFS_SUPPORT
static void     i386_zfs_probe(void);
#endif

/* from vers.c */
extern  char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];

/* XXX debugging */
extern char end[];

static void *heap_top;
static void *heap_bottom;

int
main(void)
{
    int         i;

    /* Pick up arguments */
    kargs = (void *)__args;
    initial_howto = kargs->howto;
    initial_bootdev = kargs->bootdev;
    initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;

    /* Initialize the v86 register set to a known-good state. */
    bzero(&v86, sizeof(v86));
    v86.efl = PSL_RESERVED_DEFAULT | PSL_I;

    /*
     * Initialise the heap as early as possible.  Once this is done, malloc() is usable.
     */
    bios_getmem();

#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
    defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
    if (high_heap_size > 0) {
    heap_top = PTOV(high_heap_base + high_heap_size);
    heap_bottom = PTOV(high_heap_base);
    if (high_heap_base < memtop_copyin)
        memtop_copyin = high_heap_base;
    } else
#endif
    {
    heap_top = (void *)PTOV(bios_basemem);
    heap_bottom = (void *)end;
    }
    setheap(heap_bottom, heap_top);

    /*
     * XXX Chicken-and-egg problem; we want to have console output early, but some
     * console attributes may depend on reading from eg. the boot device, which we
     * can't do yet.
     *
     * We can use printf() etc. once this is done.
     * If the previous boot stage has requested a serial console, prefer that.
     */
    bi_setboothowto(initial_howto);
    if (initial_howto & RB_MULTIPLE) {
    if (initial_howto & RB_SERIAL)
        setenv("console", "ttya text", 1);
    else
        setenv("console", "text ttya", 1);
    } else if (initial_howto & RB_SERIAL)
    setenv("console", "ttya", 1);
    else if (initial_howto & RB_MUTE)
    setenv("console", "null", 1);
    cons_probe();

    /*
     * Initialise the block cache. Set the upper limit.
     */
    bcache_init(32768, 512);

    /*
     * Special handling for PXE and CD booting.
     */
    if (kargs->bootinfo == 0) {
    /*
     * We only want the PXE disk to try to init itself in the below
     * walk through devsw if we actually booted off of PXE.
     */
    if (kargs->bootflags & KARGS_FLAGS_PXE)
        pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
    else if (kargs->bootflags & KARGS_FLAGS_CD)
        bc_add(initial_bootdev);
    }

    archsw.arch_autoload = i386_autoload;
    archsw.arch_getdev = i386_getdev;
    archsw.arch_copyin = i386_copyin;
    archsw.arch_copyout = i386_copyout;
    archsw.arch_readin = i386_readin;
    archsw.arch_isainb = isa_inb;
    archsw.arch_isaoutb = isa_outb;
#ifdef LOADER_ZFS_SUPPORT
    archsw.arch_zfs_probe = i386_zfs_probe;
#endif

    /*
     * March through the device switch probing for things.
     */
    for (i = 0; devsw[i] != NULL; i++)
    if (devsw[i]->dv_init != NULL)
        (devsw[i]->dv_init)();
    printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
    if (initial_bootinfo != NULL) {
    initial_bootinfo->bi_basemem = bios_basemem / 1024;
    initial_bootinfo->bi_extmem = bios_extmem / 1024;
    }

    /* detect ACPI for future reference */
    biosacpi_detect();

    /* detect SMBIOS for future reference */
    smbios_detect(NULL);

    /* detect PCI BIOS for future reference */
    biospci_detect();

    printf("\n");
    printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
    printf("(%s, %s)\n", bootprog_maker, bootprog_date);

    extract_currdev();              /* set $currdev and $loaddev */
    setenv("LINES", "24", 1);           /* optional */
    setenv("COLUMNS", "80", 1);         /* optional */

    if (bi_checkcpu())
    setenv("ISADIR", "amd64", 1);
    else
    setenv("ISADIR", "", 1);

    bios_getsmap();

    interact(NULL);

    /* if we ever get here, it is an error */
    return (1);
}

/*
 * Set the 'current device' by (if possible) recovering the boot device as
 * supplied by the initial bootstrap.
 *
 * XXX should be extended for netbooting.
 */
static void
extract_currdev(void)
{
    struct i386_devdesc     new_currdev;
#ifdef LOADER_ZFS_SUPPORT
    char            buf[20];
    struct zfs_boot_args    *zargs;
#endif
    int             biosdev = -1;

    /* Assume we are booting from a BIOS disk by default */
    new_currdev.d_dev = &biosdisk;

    /* new-style boot loaders such as pxeldr and cdldr */
    if (kargs->bootinfo == 0) {
        if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
        /* we are booting from a CD with cdboot */
        new_currdev.d_dev = &bioscd;
        new_currdev.d_unit = bc_bios2unit(initial_bootdev);
    } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
        /* we are booting from pxeldr */
        new_currdev.d_dev = &pxedisk;
        new_currdev.d_unit = 0;
    } else {
        /* we don't know what our boot device is */
        new_currdev.d_kind.biosdisk.slice = -1;
        new_currdev.d_kind.biosdisk.partition = 0;
        biosdev = -1;
    }
#ifdef LOADER_ZFS_SUPPORT
    } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
    zargs = NULL;
    /* check for new style extended argument */
    if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
        zargs = (struct zfs_boot_args *)(kargs + 1);

    if (zargs != NULL &&
        zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
        /* sufficient data is provided */
        new_currdev.d_kind.zfs.pool_guid = zargs->pool;
        new_currdev.d_kind.zfs.root_guid = zargs->root;
        if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
        sprintf(buf, "%llu", zargs->primary_pool);
        setenv("vfs.zfs.boot.primary_pool", buf, 1);
        sprintf(buf, "%llu", zargs->primary_vdev);
        setenv("vfs.zfs.boot.primary_vdev", buf, 1);
        }
    } else {
        /* old style zfsboot block */
        new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
        new_currdev.d_kind.zfs.root_guid = 0;
    }
    new_currdev.d_dev = &zfs_dev;
#endif
    } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
    /* The passed-in boot device is bad */
    new_currdev.d_kind.biosdisk.slice = -1;
    new_currdev.d_kind.biosdisk.partition = 0;
    biosdev = -1;
    } else {
    new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
    new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
    if (new_currdev.d_kind.biosdisk.partition == 0xff)
        new_currdev.d_kind.biosdisk.partition = -1;
    biosdev = initial_bootinfo->bi_bios_dev;

    /*
     * If we are booted by an old bootstrap, we have to guess at the BIOS
     * unit number.  We will lose if there is more than one disk type
     * and we are not booting from the lowest-numbered disk type
     * (ie. SCSI when IDE also exists).
     */
    if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2))   /* biosdev doesn't match major */
        biosdev = 0x80 + B_UNIT(initial_bootdev);       /* assume harddisk */
    }
    new_currdev.d_type = new_currdev.d_dev->dv_type;

    /*
     * If we are booting off of a BIOS disk and we didn't succeed in determining
     * which one we booted off of, just use disk0: as a reasonable default.
     */
    if ((new_currdev.d_type == biosdisk.dv_type) &&
    ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
    printf("Can't work out which disk we are booting from.\n"
           "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
    new_currdev.d_unit = 0;
    }

#ifdef LOADER_ZFS_SUPPORT
#ifdef __FreeBSD__
    if (new_currdev.d_type == DEVT_ZFS)
    init_zfs_bootenv(zfs_fmtdev(&new_currdev));
#endif
#endif

    env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
           i386_setcurrdev, env_nounset);
    env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
           env_nounset);
}

COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);

static int
command_reboot(int argc, char *argv[])
{
    int i;

    for (i = 0; devsw[i] != NULL; ++i)
    if (devsw[i]->dv_cleanup != NULL)
        (devsw[i]->dv_cleanup)();

    printf("Rebooting...\n");
    delay(1000000);
    __exit(0);
}

/* provide this for panic, as it's not in the startup code */
void
exit(int code)
{
    __exit(code);
}

COMMAND_SET(heap, "heap", "show heap usage", command_heap);

static int
command_heap(int argc, char *argv[])
{
    mallocstats();
    printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
      sbrk(0), heap_top);
    return(CMD_OK);
}

#ifdef LOADER_ZFS_SUPPORT
COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset",
    command_lszfs);

static int
command_lszfs(int argc, char *argv[])
{
    int err;

    if (argc != 2) {
    command_errmsg = "wrong number of arguments";
    return (CMD_ERROR);
    }

    err = zfs_list(argv[1]);
    if (err != 0) {
    command_errmsg = strerror(err);
    return (CMD_ERROR);
    }

    return (CMD_OK);
}

#ifdef __FreeBSD__
COMMAND_SET(reloadbe, "reloadbe", "refresh the list of ZFS Boot Environments",
    command_reloadbe);

static int
command_reloadbe(int argc, char *argv[])
{
    int err;
    char *root;

    if (argc > 2) {
    command_errmsg = "wrong number of arguments";
    return (CMD_ERROR);
    }

    if (argc == 2) {
    err = zfs_bootenv(argv[1]);
    } else {
    root = getenv("zfs_be_root");
    if (root == NULL) {
        /* There does not appear to be a ZFS pool here, exit without error */
        return (CMD_OK);
    }
    err = zfs_bootenv(getenv("zfs_be_root"));
    }

    if (err != 0) {
    command_errmsg = strerror(err);
    return (CMD_ERROR);
    }

    return (CMD_OK);
}
#endif /* __FreeBSD__ */
#endif

/* ISA bus access functions for PnP. */
static int
isa_inb(int port)
{

    return (inb(port));
}

static void
isa_outb(int port, int value)
{

    outb(port, value);
}

#ifdef LOADER_ZFS_SUPPORT
static void
i386_zfs_probe(void)
{
    char devname[32];
    int unit;

    /*
     * Open all the disks we can find and see if we can reconstruct
     * ZFS pools from them.
     */
    for (unit = 0; unit < MAXBDDEV; unit++) {
    if (bd_unit2bios(unit) == -1)
        break;
    sprintf(devname, "disk%d:", unit);
    zfs_probe_dev(devname, NULL);
    }
}
#endif