286 lines
8.5 KiB
C
286 lines
8.5 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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* $FreeBSD$
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*/
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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 <string.h>
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#include <machine/bootinfo.h>
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#include <sys/reboot.h>
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#include "bootstrap.h"
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#include "libi386/libi386.h"
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#include "btxv86.h"
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#define KARGS_FLAGS_CD 0x1
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#define KARGS_FLAGS_PXE 0x2
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/* Arguments passed in from the boot1/boot2 loader */
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static struct
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{
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u_int32_t howto;
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u_int32_t bootdev;
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u_int32_t bootflags;
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u_int32_t pxeinfo;
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u_int32_t res2;
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u_int32_t bootinfo;
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} *kargs;
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static u_int32_t initial_howto;
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static u_int32_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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/* from vers.c */
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extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
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/* XXX debugging */
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extern char end[];
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/* XXX - I dont know why we have to do this, but it helps. */
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#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT)
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char Heap[200*1024];
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#endif
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void
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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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/*
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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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/* XXX - I dont know why we have to do this, but it helps PXE. */
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#if defined(LOADER_NFS_SUPPORT) || defined(LOADER_TFTP_SUPPORT)
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setheap(Heap, Heap+sizeof(Heap));
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#else
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setheap((void *)end, (void *)bios_basemem);
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#endif
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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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if (initial_howto & RB_SERIAL)
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setenv("console", "comconsole", 1);
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cons_probe();
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/*
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* Initialise the block cache
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*/
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bcache_init(32, 512); /* 16k cache XXX tune this */
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/*
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* We only want the PXE disk to try to init itself in the below walk through
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* devsw if we actually booted off of PXE.
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*/
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if((kargs->bootinfo == NULL) &&
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((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) {
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pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
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}
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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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printf("\n");
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printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
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printf("(%s, %s)\n", bootprog_maker, bootprog_date);
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extract_currdev(); /* set $currdev and $loaddev */
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setenv("LINES", "24", 1); /* optional */
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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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interact(); /* doesn't return */
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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 currdev;
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int major, biosdev;
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/* Assume we are booting from a BIOS disk by default */
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currdev.d_dev = &biosdisk;
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currdev.d_type = currdev.d_dev->dv_type;
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/* new-style boot loaders such as pxeldr and cdldr */
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if (kargs->bootinfo == NULL) {
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if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
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/* we are booting from a CD with cdldr */
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currdev.d_kind.biosdisk.slice = -1;
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currdev.d_kind.biosdisk.partition = 0;
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biosdev = 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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currdev.d_dev = &pxedisk;
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currdev.d_type = currdev.d_dev->dv_type;
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currdev.d_kind.netif.unit = 0;
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} else {
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/* we don't know what our boot device is */
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currdev.d_kind.biosdisk.slice = -1;
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currdev.d_kind.biosdisk.partition = 0;
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biosdev = -1;
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}
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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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currdev.d_kind.biosdisk.slice = -1;
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currdev.d_kind.biosdisk.partition = 0;
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biosdev = -1;
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} else {
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currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
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B_CONTROLLER(initial_bootdev) - 1;
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currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
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biosdev = initial_bootinfo->bi_bios_dev;
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major = B_TYPE(initial_bootdev);
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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 loose 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 ((currdev.d_type == devsw[0]->dv_type) &&
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((currdev.d_kind.biosdisk.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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currdev.d_kind.biosdisk.unit = 0;
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}
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env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
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env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, 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\n", end, sbrk(0));
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return(CMD_OK);
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}
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/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
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static int
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isa_inb(int port)
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{
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u_char data;
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if (__builtin_constant_p(port) &&
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(((port) & 0xffff) < 0x100) &&
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((port) < 0x10000)) {
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__asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
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} else {
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__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
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}
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return(data);
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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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u_char al = value;
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if (__builtin_constant_p(port) &&
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(((port) & 0xffff) < 0x100) &&
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((port) < 0x10000)) {
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__asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
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} else {
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__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
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}
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}
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