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 1.28 2003/08/25 23:28:32 obrien Exp $
27 * $DragonFly: src/sys/boot/pc32/loader/main.c,v 1.4 2004/06/26 02:26:21 dillon Exp $
31 * MD bootstrap main() and assorted miscellaneous
37 #include <machine/bootinfo.h>
38 #include <sys/reboot.h>
40 #include "bootstrap.h"
41 #include "libi386/libi386.h"
44 #define KARGS_FLAGS_CD 0x1
45 #define KARGS_FLAGS_PXE 0x2
47 /* Arguments passed in from the boot1/boot2 loader */
58 static u_int32_t initial_howto;
59 static u_int32_t initial_bootdev;
60 static struct bootinfo *initial_bootinfo;
62 struct arch_switch archsw; /* MI/MD interface boundary */
64 static void extract_currdev(void);
65 static int isa_inb(int port);
66 static void isa_outb(int port, int value);
70 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
75 #ifdef COMCONSOLE_DEBUG
80 isa_outb(0x3f8+3, 0x83); /* DLAB + 8N1 */
81 isa_outb(0x3f8+0, (115200 / 9600) & 0xFF);
82 isa_outb(0x3f8+1, (115200 / 9600) >> 8);
83 isa_outb(0x3f8+3, 0x03); /* 8N1 */
84 isa_outb(0x3f8+4, 0x03); /* RTS+DTR */
85 isa_outb(0x3f8+2, 0x01); /* FIFO_ENABLE */
109 /* Pick up arguments */
110 kargs = (void *)__args;
111 initial_howto = kargs->howto;
112 initial_bootdev = kargs->bootdev;
113 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
115 #ifdef COMCONSOLE_DEBUG
116 printf("args at %p initial_howto = %08x bootdev = %08x bootinfo = %p\n",
117 kargs, initial_howto, initial_bootdev, initial_bootinfo);
121 * Initialize the heap as early as possible. Once this is done,
122 * malloc() is usable.
126 if (bios_basemem > 0x9f000)
127 bios_basemem = 0x9f000;
130 setheap((void *)end, (void *)bios_basemem);
133 * XXX Chicken-and-egg problem; we want to have console output early,
134 * but some console attributes may depend on reading from eg. the boot
135 * device, which we can't do yet.
137 * We can use printf() etc. once this is done.
138 * If the previous boot stage has requested a serial console, prefer that.
140 if (initial_howto & RB_VIDEO)
141 setenv("console", "vidconsole", 1);
142 if (initial_howto & RB_SERIAL)
143 setenv("console", "comconsole", 1);
144 if (initial_howto & RB_MUTE)
145 setenv("console", "nullconsole", 1);
149 * Initialise the block cache
151 bcache_init(32, 512); /* 16k cache XXX tune this */
154 * Special handling for PXE and CD booting.
156 if (kargs->bootinfo == NULL) {
158 * We only want the PXE disk to try to init itself in the below
159 * walk through devsw if we actually booted off of PXE.
161 if (kargs->bootflags & KARGS_FLAGS_PXE)
162 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
163 else if (kargs->bootflags & KARGS_FLAGS_CD)
164 bc_add(initial_bootdev);
168 * March through the device switch probing for things.
170 for (i = 0; devsw[i] != NULL; i++) {
172 if (devsw[i]->dv_init != NULL)
173 (devsw[i]->dv_init)();
176 printf("BIOS %dkB/%dkB (method %d) available memory\n", bios_basemem / 1024, bios_extmem / 1024, bios_howmem);
177 if (initial_bootinfo != NULL) {
178 initial_bootinfo->bi_basemem = bios_basemem / 1024;
179 initial_bootinfo->bi_extmem = bios_extmem / 1024;
182 /* detect ACPI for future reference */
186 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
187 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
189 extract_currdev(); /* set $currdev and $loaddev */
190 setenv("LINES", "24", 1); /* optional */
194 archsw.arch_autoload = i386_autoload;
195 archsw.arch_getdev = i386_getdev;
196 archsw.arch_copyin = i386_copyin;
197 archsw.arch_copyout = i386_copyout;
198 archsw.arch_readin = i386_readin;
199 archsw.arch_isainb = isa_inb;
200 archsw.arch_isaoutb = isa_outb;
202 interact(); /* doesn't return */
204 /* if we ever get here, it is an error */
209 * Set the 'current device' by (if possible) recovering the boot device as
210 * supplied by the initial bootstrap.
212 * XXX should be extended for netbooting.
215 extract_currdev(void)
217 struct i386_devdesc new_currdev;
218 int major, biosdev = -1;
220 /* Assume we are booting from a BIOS disk by default */
221 new_currdev.d_dev = &biosdisk;
223 /* new-style boot loaders such as pxeldr and cdldr */
224 if (kargs->bootinfo == NULL) {
225 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
226 /* we are booting from a CD with cdboot */
227 new_currdev.d_dev = &bioscd;
228 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
229 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
230 /* we are booting from pxeldr */
231 new_currdev.d_dev = &pxedisk;
232 new_currdev.d_kind.netif.unit = 0;
234 /* we don't know what our boot device is */
235 new_currdev.d_kind.biosdisk.slice = -1;
236 new_currdev.d_kind.biosdisk.partition = 0;
239 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
240 /* The passed-in boot device is bad */
241 new_currdev.d_kind.biosdisk.slice = -1;
242 new_currdev.d_kind.biosdisk.partition = 0;
245 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
246 B_CONTROLLER(initial_bootdev) - 1;
247 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
248 biosdev = initial_bootinfo->bi_bios_dev;
249 major = B_TYPE(initial_bootdev);
252 * If we are booted by an old bootstrap, we have to guess at the BIOS
253 * unit number. We will loose if there is more than one disk type
254 * and we are not booting from the lowest-numbered disk type
255 * (ie. SCSI when IDE also exists).
257 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
258 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
260 new_currdev.d_type = new_currdev.d_dev->dv_type;
263 * If we are booting off of a BIOS disk and we didn't succeed in determining
264 * which one we booted off of, just use disk0: as a reasonable default.
266 if ((new_currdev.d_type == biosdisk.dv_type) &&
267 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
268 printf("Can't work out which disk we are booting from.\n"
269 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
270 new_currdev.d_kind.biosdisk.unit = 0;
272 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
273 i386_setcurrdev, env_nounset);
274 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
278 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
281 command_reboot(int argc, char *argv[])
285 for (i = 0; devsw[i] != NULL; ++i)
286 if (devsw[i]->dv_cleanup != NULL)
287 (devsw[i]->dv_cleanup)();
289 printf("Rebooting...\n");
294 /* provide this for panic, as it's not in the startup code */
301 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
304 command_heap(int argc, char *argv[])
307 printf("heap base at %p, top at %p\n", end, sbrk(0));
311 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
317 if (__builtin_constant_p(port) &&
318 (((port) & 0xffff) < 0x100) &&
319 ((port) < 0x10000)) {
320 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
322 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
328 isa_outb(int port, int value)
332 if (__builtin_constant_p(port) &&
333 (((port) & 0xffff) < 0x100) &&
334 ((port) < 0x10000)) {
335 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
337 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));