415 lines
12 KiB
C
415 lines
12 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* MD bootstrap main() and assorted miscellaneous
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* commands.
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*/
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#include <stand.h>
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#include <stddef.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <machine/cpufunc.h>
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#include <machine/psl.h>
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#include <sys/disk.h>
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#include <sys/reboot.h>
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#include <common/drv.h>
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#include "bootstrap.h"
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#include "common/bootargs.h"
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#include "libi386/libi386.h"
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#include "libi386/smbios.h"
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#include "btxv86.h"
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#ifdef LOADER_ZFS_SUPPORT
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#include "libzfs.h"
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#endif
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CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
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CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
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CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
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CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
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/* Arguments passed in from the boot1/boot2 loader */
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static struct bootargs *kargs;
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static uint32_t initial_howto;
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static uint32_t initial_bootdev;
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static struct bootinfo *initial_bootinfo;
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struct arch_switch archsw; /* MI/MD interface boundary */
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static void extract_currdev(void);
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static int isa_inb(int port);
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static void isa_outb(int port, int value);
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void exit(int code);
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#ifdef LOADER_GELI_SUPPORT
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#include "geliboot.h"
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struct geli_boot_args *gargs;
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struct geli_boot_data *gbdata;
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#endif
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#ifdef LOADER_ZFS_SUPPORT
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struct zfs_boot_args *zargs;
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static void i386_zfs_probe(void);
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#endif
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/* XXX debugging */
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extern char end[];
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static void *heap_top;
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static void *heap_bottom;
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int
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main(void)
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{
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int i;
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/* Pick up arguments */
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kargs = (void *)__args;
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initial_howto = kargs->howto;
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initial_bootdev = kargs->bootdev;
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initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
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/* Initialize the v86 register set to a known-good state. */
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bzero(&v86, sizeof(v86));
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v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
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/*
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* Initialise the heap as early as possible. Once this is done, malloc() is usable.
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*/
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bios_getmem();
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#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
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defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
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if (high_heap_size > 0) {
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heap_top = PTOV(high_heap_base + high_heap_size);
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heap_bottom = PTOV(high_heap_base);
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if (high_heap_base < memtop_copyin)
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memtop_copyin = high_heap_base;
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} else
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#endif
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{
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heap_top = (void *)PTOV(bios_basemem);
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heap_bottom = (void *)end;
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}
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setheap(heap_bottom, heap_top);
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/*
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* XXX Chicken-and-egg problem; we want to have console output early, but some
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* console attributes may depend on reading from eg. the boot device, which we
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* can't do yet.
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*
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* We can use printf() etc. once this is done.
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* If the previous boot stage has requested a serial console, prefer that.
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*/
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bi_setboothowto(initial_howto);
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if (initial_howto & RB_MULTIPLE) {
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if (initial_howto & RB_SERIAL)
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setenv("console", "comconsole vidconsole", 1);
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else
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setenv("console", "vidconsole comconsole", 1);
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} else if (initial_howto & RB_SERIAL)
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setenv("console", "comconsole", 1);
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else if (initial_howto & RB_MUTE)
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setenv("console", "nullconsole", 1);
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cons_probe();
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/*
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* Initialise the block cache. Set the upper limit.
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*/
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bcache_init(32768, 512);
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/*
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* Special handling for PXE and CD booting.
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*/
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if (kargs->bootinfo == 0) {
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/*
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* We only want the PXE disk to try to init itself in the below
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* walk through devsw if we actually booted off of PXE.
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*/
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if (kargs->bootflags & KARGS_FLAGS_PXE)
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pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
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else if (kargs->bootflags & KARGS_FLAGS_CD)
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bc_add(initial_bootdev);
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}
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archsw.arch_autoload = i386_autoload;
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archsw.arch_getdev = i386_getdev;
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archsw.arch_copyin = i386_copyin;
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archsw.arch_copyout = i386_copyout;
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archsw.arch_readin = i386_readin;
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archsw.arch_isainb = isa_inb;
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archsw.arch_isaoutb = isa_outb;
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#ifdef LOADER_ZFS_SUPPORT
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archsw.arch_zfs_probe = i386_zfs_probe;
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/*
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* zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, so if that is
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* set along with KARGS_FLAGS_EXTARG we know we can interpret the extarg
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* data as a struct zfs_boot_args.
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*/
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#define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
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if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
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zargs = (struct zfs_boot_args *)(kargs + 1);
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}
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#endif /* LOADER_ZFS_SUPPORT */
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#ifdef LOADER_GELI_SUPPORT
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/*
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* If we decided earlier that we have zfs_boot_args extarg data, and it is
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* big enough to contain the embedded geli data (the early zfs_boot_args
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* structs weren't), then init the gbdata pointer accordingly. If there is
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* extarg data which isn't zfs_boot_args data, determine whether it is
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* geli_boot_args data. Recent versions of gptboot set KARGS_FLAGS_GELI to
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* indicate that. Earlier versions didn't, but we presume that's what we
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* have if the extarg size exactly matches the size of the geli_boot_args
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* struct during that pre-flag era.
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*/
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#define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
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#ifdef LOADER_ZFS_SUPPORT
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if (zargs != NULL) {
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if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
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gbdata = &zargs->gelidata;
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}
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} else
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#endif /* LOADER_ZFS_SUPPORT */
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if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
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gargs = (struct geli_boot_args *)(kargs + 1);
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if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
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gargs->size == LEGACY_GELI_ARGS_SIZE) {
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gbdata = &gargs->gelidata;
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}
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}
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if (gbdata != NULL)
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import_geli_boot_data(gbdata);
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#endif /* LOADER_GELI_SUPPORT */
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/*
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* March through the device switch probing for things.
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*/
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for (i = 0; devsw[i] != NULL; i++)
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if (devsw[i]->dv_init != NULL)
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(devsw[i]->dv_init)();
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printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
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if (initial_bootinfo != NULL) {
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initial_bootinfo->bi_basemem = bios_basemem / 1024;
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initial_bootinfo->bi_extmem = bios_extmem / 1024;
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}
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/* detect ACPI for future reference */
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biosacpi_detect();
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/* detect SMBIOS for future reference */
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smbios_detect(NULL);
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/* detect PCI BIOS for future reference */
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biospci_detect();
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printf("\n%s", bootprog_info);
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extract_currdev(); /* set $currdev and $loaddev */
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bios_getsmap();
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interact();
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/* if we ever get here, it is an error */
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return (1);
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}
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/*
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* Set the 'current device' by (if possible) recovering the boot device as
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* supplied by the initial bootstrap.
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*
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* XXX should be extended for netbooting.
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*/
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static void
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extract_currdev(void)
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{
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struct i386_devdesc new_currdev;
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#ifdef LOADER_ZFS_SUPPORT
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char buf[20];
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#endif
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int biosdev = -1;
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/* Assume we are booting from a BIOS disk by default */
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new_currdev.dd.d_dev = &bioshd;
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/* new-style boot loaders such as pxeldr and cdldr */
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if (kargs->bootinfo == 0) {
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if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
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/* we are booting from a CD with cdboot */
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new_currdev.dd.d_dev = &bioscd;
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new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
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} else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
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/* we are booting from pxeldr */
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new_currdev.dd.d_dev = &pxedisk;
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new_currdev.dd.d_unit = 0;
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} else {
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/* we don't know what our boot device is */
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new_currdev.d_kind.biosdisk.slice = -1;
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new_currdev.d_kind.biosdisk.partition = 0;
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biosdev = -1;
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}
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#ifdef LOADER_ZFS_SUPPORT
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} else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
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/* zargs was set in main() if we have new style extended argument */
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if (zargs != NULL &&
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zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
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/* sufficient data is provided */
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new_currdev.d_kind.zfs.pool_guid = zargs->pool;
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new_currdev.d_kind.zfs.root_guid = zargs->root;
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if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
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sprintf(buf, "%llu", zargs->primary_pool);
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setenv("vfs.zfs.boot.primary_pool", buf, 1);
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sprintf(buf, "%llu", zargs->primary_vdev);
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setenv("vfs.zfs.boot.primary_vdev", buf, 1);
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}
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} else {
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/* old style zfsboot block */
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new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
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new_currdev.d_kind.zfs.root_guid = 0;
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}
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new_currdev.dd.d_dev = &zfs_dev;
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#endif
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} else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
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/* The passed-in boot device is bad */
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new_currdev.d_kind.biosdisk.slice = -1;
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new_currdev.d_kind.biosdisk.partition = 0;
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biosdev = -1;
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} else {
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new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
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new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
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biosdev = initial_bootinfo->bi_bios_dev;
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/*
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* If we are booted by an old bootstrap, we have to guess at the BIOS
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* unit number. We will lose if there is more than one disk type
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* and we are not booting from the lowest-numbered disk type
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* (ie. SCSI when IDE also exists).
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*/
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if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
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biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
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}
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/*
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* If we are booting off of a BIOS disk and we didn't succeed in determining
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* which one we booted off of, just use disk0: as a reasonable default.
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*/
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if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
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((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
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printf("Can't work out which disk we are booting from.\n"
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"Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
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new_currdev.dd.d_unit = 0;
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}
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#ifdef LOADER_ZFS_SUPPORT
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if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
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init_zfs_bootenv(zfs_fmtdev(&new_currdev));
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#endif
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env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
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i386_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
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env_nounset);
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}
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COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
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static int
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command_reboot(int argc, char *argv[])
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{
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int i;
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for (i = 0; devsw[i] != NULL; ++i)
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if (devsw[i]->dv_cleanup != NULL)
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(devsw[i]->dv_cleanup)();
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printf("Rebooting...\n");
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delay(1000000);
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__exit(0);
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}
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/* provide this for panic, as it's not in the startup code */
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void
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exit(int code)
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{
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__exit(code);
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}
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COMMAND_SET(heap, "heap", "show heap usage", command_heap);
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static int
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command_heap(int argc, char *argv[])
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{
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mallocstats();
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printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
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sbrk(0), heap_top);
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return(CMD_OK);
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}
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/* ISA bus access functions for PnP. */
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static int
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isa_inb(int port)
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{
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return (inb(port));
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}
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static void
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isa_outb(int port, int value)
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{
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outb(port, value);
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}
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#ifdef LOADER_ZFS_SUPPORT
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static void
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i386_zfs_probe(void)
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{
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char devname[32];
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struct i386_devdesc dev;
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/*
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* Open all the disks we can find and see if we can reconstruct
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* ZFS pools from them.
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*/
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dev.dd.d_dev = &bioshd;
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for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
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snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
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dev.dd.d_unit);
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zfs_probe_dev(devname, NULL);
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}
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}
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#endif
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