freebsd-skq/stand/i386/loader/main.c
ian d4fe27589a Don't reference zfs-specific variables if LOADER_ZFS_SUPPORT is undefined
because the variables will be undefined too.

Reported by:	sjg@
Pointy hat:	ian@
2018-12-06 20:28:09 +00:00

416 lines
12 KiB
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/disk.h>
#include <sys/reboot.h>
#include <common/drv.h>
#include "bootstrap.h"
#include "common/bootargs.h"
#include "libi386/libi386.h"
#include "libi386/smbios.h"
#include "btxv86.h"
#ifdef LOADER_ZFS_SUPPORT
#include "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 uint32_t initial_howto;
static uint32_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_GELI_SUPPORT
#include "geliboot.h"
struct geli_boot_args *gargs;
struct geli_boot_data *gbdata;
#endif
#ifdef LOADER_ZFS_SUPPORT
struct zfs_boot_args *zargs;
static void i386_zfs_probe(void);
#endif
/* 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", "comconsole vidconsole", 1);
else
setenv("console", "vidconsole comconsole", 1);
} else if (initial_howto & RB_SERIAL)
setenv("console", "comconsole", 1);
else if (initial_howto & RB_MUTE)
setenv("console", "nullconsole", 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;
/*
* zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, so if that is
* set along with KARGS_FLAGS_EXTARG we know we can interpret the extarg
* data as a struct zfs_boot_args.
*/
#define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
zargs = (struct zfs_boot_args *)(kargs + 1);
}
#endif /* LOADER_ZFS_SUPPORT */
#ifdef LOADER_GELI_SUPPORT
/*
* If we decided earlier that we have zfs_boot_args extarg data, and it is
* big enough to contain the embedded geli data (the early zfs_boot_args
* structs weren't), then init the gbdata pointer accordingly. If there is
* extarg data which isn't zfs_boot_args data, determine whether it is
* geli_boot_args data. Recent versions of gptboot set KARGS_FLAGS_GELI to
* indicate that. Earlier versions didn't, but we presume that's what we
* have if the extarg size exactly matches the size of the geli_boot_args
* struct during that pre-flag era.
*/
#define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
#ifdef LOADER_ZFS_SUPPORT
if (zargs != NULL) {
if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
gbdata = &zargs->gelidata;
}
} else
#endif /* LOADER_ZFS_SUPPORT */
if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
gargs = (struct geli_boot_args *)(kargs + 1);
if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
gargs->size == LEGACY_GELI_ARGS_SIZE) {
gbdata = &gargs->gelidata;
}
}
if (gbdata != NULL)
import_geli_boot_data(gbdata);
#endif /* LOADER_GELI_SUPPORT */
/*
* 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%s", bootprog_info);
extract_currdev(); /* set $currdev and $loaddev */
setenv("LINES", "24", 1); /* optional */
bios_getsmap();
interact();
/* 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];
#endif
int biosdev = -1;
/* Assume we are booting from a BIOS disk by default */
new_currdev.dd.d_dev = &bioshd;
/* 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.dd.d_dev = &bioscd;
new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
} else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
/* we are booting from pxeldr */
new_currdev.dd.d_dev = &pxedisk;
new_currdev.dd.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 was set in main() if we have new style extended argument */
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.dd.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);
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 */
}
/*
* 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.dd.d_dev->dv_type == bioshd.dv_type) &&
((new_currdev.dd.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.dd.d_unit = 0;
}
#ifdef LOADER_ZFS_SUPPORT
if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
init_zfs_bootenv(zfs_fmtdev(&new_currdev));
#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);
}
/* 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];
struct i386_devdesc dev;
/*
* Open all the disks we can find and see if we can reconstruct
* ZFS pools from them.
*/
dev.dd.d_dev = &bioshd;
for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
dev.dd.d_unit);
zfs_probe_dev(devname, NULL);
}
}
#endif