2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/boot/i386/loader/main.c,v 1.17.2.7 2002/10/10 15:53:27 iwasaki Exp $
30 * MD bootstrap main() and assorted miscellaneous
36 #include <machine/bootinfo.h>
37 #include <sys/reboot.h>
39 #include "bootstrap.h"
40 #include "libi386/libi386.h"
43 #define KARGS_FLAGS_CD 0x1
44 #define KARGS_FLAGS_PXE 0x2
46 /* Arguments passed in from the boot1/boot2 loader */
57 static u_int32_t initial_howto;
58 static u_int32_t initial_bootdev;
59 static struct bootinfo *initial_bootinfo;
61 struct arch_switch archsw; /* MI/MD interface boundary */
63 static void extract_currdev(void);
64 static int isa_inb(int port);
65 static void isa_outb(int port, int value);
69 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
79 /* Pick up arguments */
80 kargs = (void *)__args;
81 initial_howto = kargs->howto;
82 initial_bootdev = kargs->bootdev;
83 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
86 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
90 setheap((void *)end, (void *)bios_basemem);
93 * XXX Chicken-and-egg problem; we want to have console output early, but some
94 * console attributes may depend on reading from eg. the boot device, which we
97 * We can use printf() etc. once this is done.
98 * If the previous boot stage has requested a serial console, prefer that.
100 if (initial_howto & RB_SERIAL)
101 setenv("console", "comconsole", 1);
102 if (initial_howto & RB_MUTE)
103 setenv("console", "nullconsole", 1);
107 * Initialise the block cache
109 bcache_init(32, 512); /* 16k cache XXX tune this */
112 * Special handling for PXE and CD booting.
114 if (kargs->bootinfo == NULL) {
116 * We only want the PXE disk to try to init itself in the below
117 * walk through devsw if we actually booted off of PXE.
119 if (kargs->bootflags & KARGS_FLAGS_PXE)
120 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
121 else if (kargs->bootflags & KARGS_FLAGS_CD)
122 bc_add(initial_bootdev);
126 * March through the device switch probing for things.
128 for (i = 0; devsw[i] != NULL; i++)
129 if (devsw[i]->dv_init != NULL)
130 (devsw[i]->dv_init)();
131 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
134 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
135 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
137 if (initial_bootinfo != NULL) {
138 initial_bootinfo->bi_basemem = bios_basemem / 1024;
139 initial_bootinfo->bi_extmem = bios_extmem / 1024;
142 extract_currdev(); /* set $currdev and $loaddev */
143 setenv("LINES", "24", 1); /* optional */
145 archsw.arch_autoload = i386_autoload;
146 archsw.arch_getdev = i386_getdev;
147 archsw.arch_copyin = i386_copyin;
148 archsw.arch_copyout = i386_copyout;
149 archsw.arch_readin = i386_readin;
150 archsw.arch_isainb = isa_inb;
151 archsw.arch_isaoutb = isa_outb;
153 interact(); /* doesn't return */
155 /* if we ever get here, it is an error */
160 * Set the 'current device' by (if possible) recovering the boot device as
161 * supplied by the initial bootstrap.
163 * XXX should be extended for netbooting.
166 extract_currdev(void)
168 struct i386_devdesc new_currdev;
169 int major, biosdev = -1;
171 /* Assume we are booting from a BIOS disk by default */
172 new_currdev.d_dev = &biosdisk;
174 /* new-style boot loaders such as pxeldr and cdldr */
175 if (kargs->bootinfo == NULL) {
176 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
177 /* we are booting from a CD with cdboot */
178 new_currdev.d_dev = &bioscd;
179 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
180 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
181 /* we are booting from pxeldr */
182 new_currdev.d_dev = &pxedisk;
183 new_currdev.d_kind.netif.unit = 0;
185 /* we don't know what our boot device is */
186 new_currdev.d_kind.biosdisk.slice = -1;
187 new_currdev.d_kind.biosdisk.partition = 0;
190 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
191 /* The passed-in boot device is bad */
192 new_currdev.d_kind.biosdisk.slice = -1;
193 new_currdev.d_kind.biosdisk.partition = 0;
196 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
197 B_CONTROLLER(initial_bootdev) - 1;
198 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
199 biosdev = initial_bootinfo->bi_bios_dev;
200 major = B_TYPE(initial_bootdev);
203 * If we are booted by an old bootstrap, we have to guess at the BIOS
204 * unit number. We will loose if there is more than one disk type
205 * and we are not booting from the lowest-numbered disk type
206 * (ie. SCSI when IDE also exists).
208 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
209 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
211 new_currdev.d_type = new_currdev.d_dev->dv_type;
214 * If we are booting off of a BIOS disk and we didn't succeed in determining
215 * which one we booted off of, just use disk0: as a reasonable default.
217 if ((new_currdev.d_type == biosdisk.dv_type) &&
218 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
219 printf("Can't work out which disk we are booting from.\n"
220 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
221 new_currdev.d_kind.biosdisk.unit = 0;
223 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
224 i386_setcurrdev, env_nounset);
225 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
229 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
232 command_reboot(int argc, char *argv[])
236 for (i = 0; devsw[i] != NULL; ++i)
237 if (devsw[i]->dv_cleanup != NULL)
238 (devsw[i]->dv_cleanup)();
240 printf("Rebooting...\n");
245 /* provide this for panic, as it's not in the startup code */
252 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
255 command_heap(int argc, char *argv[])
258 printf("heap base at %p, top at %p\n", end, sbrk(0));
262 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
268 if (__builtin_constant_p(port) &&
269 (((port) & 0xffff) < 0x100) &&
270 ((port) < 0x10000)) {
271 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
273 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
279 isa_outb(int port, int value)
283 if (__builtin_constant_p(port) &&
284 (((port) & 0xffff) < 0x100) &&
285 ((port) < 0x10000)) {
286 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
288 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));