2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
35 * All rights reserved.
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * $FreeBSD: src/sys/boot/i386/loader/main.c,v 1.28 2003/08/25 23:28:32 obrien Exp $
59 * $DragonFly: src/sys/boot/pc32/loader/main.c,v 1.9 2008/06/05 18:06:31 swildner Exp $
63 * MD bootstrap main() and assorted miscellaneous
69 #include <machine/bootinfo.h>
70 #include <machine/psl.h>
71 #include <sys/reboot.h>
73 #include "bootstrap.h"
74 #include "libi386/libi386.h"
77 #define KARGS_FLAGS_CD 0x1
78 #define KARGS_FLAGS_PXE 0x2
80 /* Arguments passed in from the boot1/boot2 loader */
91 static u_int32_t initial_howto;
92 static u_int32_t initial_bootdev;
93 static struct bootinfo *initial_bootinfo;
95 struct arch_switch archsw; /* MI/MD interface boundary */
97 static void extract_currdev(void);
98 static int isa_inb(int port);
99 static void isa_outb(int port, int value);
103 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
108 #define COMCONSOLE_DEBUG
109 #ifdef COMCONSOLE_DEBUG
114 isa_outb(0x3f8+3, 0x83); /* DLAB + 8N1 */
115 isa_outb(0x3f8+0, (115200 / 9600) & 0xFF);
116 isa_outb(0x3f8+1, (115200 / 9600) >> 8);
117 isa_outb(0x3f8+3, 0x03); /* 8N1 */
118 isa_outb(0x3f8+4, 0x03); /* RTS+DTR */
119 isa_outb(0x3f8+2, 0x01); /* FIFO_ENABLE */
131 #define WDEBUG_INIT()
144 /* Pick up arguments */
145 kargs = (void *)__args;
146 initial_howto = kargs->howto;
147 initial_bootdev = kargs->bootdev;
148 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
150 #ifdef COMCONSOLE_DEBUG
151 printf("args at %p initial_howto = %08x bootdev = %08x bootinfo = %p\n",
152 kargs, initial_howto, initial_bootdev, initial_bootinfo);
155 /* Initialize the v86 register set to a known-good state. */
156 bzero(&v86, sizeof(v86));
157 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
161 * Initialize the heap as early as possible. Once this is done,
162 * malloc() is usable.
164 * Don't include our stack in the heap. If the stack is in low
165 * user memory use {end,bios_basemem}. If the stack is in high
166 * user memory but not extended memory then don't let the heap
167 * overlap the stack. If the stack is in extended memory limit
168 * the heap to bios_basemem.
170 * Be sure to use the virtual bios_basemem address rather then
171 * the physical bios_basemem address or we may overwrite BIOS
175 memend = (char *)&memend - 0x8000; /* space for stack */
176 memend = (char *)((uintptr_t)memend & ~(uintptr_t)(0x1000 - 1));
177 if (memend < (char *)end) {
178 setheap((void *)end, PTOV(bios_basemem));
180 if (memend > (char *)PTOV(bios_basemem))
181 memend = (char *)PTOV(bios_basemem);
182 setheap((void *)end, memend);
186 * XXX Chicken-and-egg problem; we want to have console output early,
187 * but some console attributes may depend on reading from eg. the boot
188 * device, which we can't do yet.
190 * We can use printf() etc. once this is done. The previous boot stage
191 * might have requested a video or serial preference, in which case we
192 * set it. If neither is specified or both are specified we leave the
193 * console environment variable alone, defaulting to dual boot.
195 if (initial_howto & RB_MUTE) {
196 setenv("console", "nullconsole", 1);
197 } else if ((initial_howto & (RB_VIDEO|RB_SERIAL)) != (RB_VIDEO|RB_SERIAL)) {
198 if (initial_howto & RB_VIDEO)
199 setenv("console", "vidconsole", 1);
200 if (initial_howto & RB_SERIAL)
201 setenv("console", "comconsole", 1);
206 * Initialise the block cache
208 bcache_init(32, 512); /* 16k cache XXX tune this */
211 * Special handling for PXE and CD booting.
213 if (kargs->bootinfo == 0) {
215 * We only want the PXE disk to try to init itself in the below
216 * walk through devsw if we actually booted off of PXE.
218 if (kargs->bootflags & KARGS_FLAGS_PXE)
219 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
220 else if (kargs->bootflags & KARGS_FLAGS_CD)
221 bc_add(initial_bootdev);
225 * March through the device switch probing for things.
227 for (i = 0; devsw[i] != NULL; i++) {
229 if (devsw[i]->dv_init != NULL)
230 (devsw[i]->dv_init)();
233 printf("BIOS %dkB/%dkB available memory\n",
234 bios_basemem / 1024, bios_extmem / 1024);
235 if (initial_bootinfo != NULL) {
236 initial_bootinfo->bi_basemem = bios_basemem / 1024;
237 initial_bootinfo->bi_extmem = bios_extmem / 1024;
240 /* detect ACPI for future reference */
244 setenv("ehci_load", "YES", 1);
247 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
248 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
250 extract_currdev(); /* set $currdev and $loaddev */
251 setenv("LINES", "24", 1); /* optional */
255 archsw.arch_autoload = i386_autoload;
256 archsw.arch_getdev = i386_getdev;
257 archsw.arch_copyin = i386_copyin;
258 archsw.arch_copyout = i386_copyout;
259 archsw.arch_readin = i386_readin;
260 archsw.arch_isainb = isa_inb;
261 archsw.arch_isaoutb = isa_outb;
263 interact(); /* doesn't return */
265 /* if we ever get here, it is an error */
270 * Set the 'current device' by (if possible) recovering the boot device as
271 * supplied by the initial bootstrap.
273 * XXX should be extended for netbooting.
276 extract_currdev(void)
278 struct i386_devdesc new_currdev;
279 int major, biosdev = -1;
281 /* Assume we are booting from a BIOS disk by default */
282 new_currdev.d_dev = &biosdisk;
284 /* new-style boot loaders such as pxeldr and cdldr */
285 if (kargs->bootinfo == 0) {
286 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
287 /* we are booting from a CD with cdboot */
288 new_currdev.d_dev = &bioscd;
289 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
290 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
291 /* we are booting from pxeldr */
292 new_currdev.d_dev = &pxedisk;
293 new_currdev.d_kind.netif.unit = 0;
295 /* we don't know what our boot device is */
296 new_currdev.d_kind.biosdisk.slice = -1;
297 new_currdev.d_kind.biosdisk.partition = 0;
300 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
301 /* The passed-in boot device is bad */
302 new_currdev.d_kind.biosdisk.slice = -1;
303 new_currdev.d_kind.biosdisk.partition = 0;
306 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
307 B_CONTROLLER(initial_bootdev) - 1;
308 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
309 biosdev = initial_bootinfo->bi_bios_dev;
310 major = B_TYPE(initial_bootdev);
313 * If we are booted by an old bootstrap, we have to guess at the BIOS
314 * unit number. We will loose if there is more than one disk type
315 * and we are not booting from the lowest-numbered disk type
316 * (ie. SCSI when IDE also exists).
318 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
319 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
321 new_currdev.d_type = new_currdev.d_dev->dv_type;
324 * If we are booting off of a BIOS disk and we didn't succeed in determining
325 * which one we booted off of, just use disk0: as a reasonable default.
327 if ((new_currdev.d_type == biosdisk.dv_type) &&
328 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
329 printf("Can't work out which disk we are booting from.\n"
330 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
331 new_currdev.d_kind.biosdisk.unit = 0;
333 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
334 i386_setcurrdev, env_nounset);
335 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
339 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
342 command_reboot(int argc, char *argv[])
346 for (i = 0; devsw[i] != NULL; ++i)
347 if (devsw[i]->dv_cleanup != NULL)
348 (devsw[i]->dv_cleanup)();
350 printf("Rebooting...\n");
355 /* provide this for panic, as it's not in the startup code */
362 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
365 command_heap(int argc, char *argv[])
368 printf("heap base at %p, top at %p\n", end, sbrk(0));
372 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
378 if (__builtin_constant_p(port) &&
379 (((port) & 0xffff) < 0x100) &&
380 ((port) < 0x10000)) {
381 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
383 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
389 isa_outb(int port, int value)
393 if (__builtin_constant_p(port) &&
394 (((port) & 0xffff) < 0x100) &&
395 ((port) < 0x10000)) {
396 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
398 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));