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/pc98/loader/main.c,v 1.7.2.6 2001/12/22 15:08:49 nyan Exp $
27 * $DragonFly: src/sys/boot/pc98/loader/Attic/main.c,v 1.2 2003/06/17 04:28:18 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[];
80 /* Pick up arguments */
81 kargs = (void *)__args;
82 initial_howto = kargs->howto;
83 initial_bootdev = kargs->bootdev;
84 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
87 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
91 setheap((void *)end, (void *)bios_basemem);
94 * XXX Chicken-and-egg problem; we want to have console output early, but some
95 * console attributes may depend on reading from eg. the boot device, which we
98 * We can use printf() etc. once this is done.
99 * If the previous boot stage has requested a serial console, prefer that.
101 if (initial_howto & RB_SERIAL)
102 setenv("console", "comconsole", 1);
103 if (initial_howto & RB_MUTE)
104 setenv("console", "nullconsole", 1);
108 * Initialise the block cache
110 bcache_init(32, 512); /* 16k cache XXX tune this */
113 * Special handling for PXE and CD booting.
115 if (kargs->bootinfo == NULL) {
117 * We only want the PXE disk to try to init itself in the below
118 * walk through devsw if we actually booted off of PXE.
120 if (kargs->bootflags & KARGS_FLAGS_PXE)
121 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
122 else if (kargs->bootflags & KARGS_FLAGS_CD)
123 bc_add(initial_bootdev);
127 * March through the device switch probing for things.
129 for (i = 0; devsw[i] != NULL; i++)
130 if (devsw[i]->dv_init != NULL)
131 (devsw[i]->dv_init)();
132 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
135 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
136 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
138 extract_currdev(); /* set $currdev and $loaddev */
139 setenv("LINES", "24", 1); /* optional */
141 archsw.arch_autoload = i386_autoload;
142 archsw.arch_getdev = i386_getdev;
143 archsw.arch_copyin = i386_copyin;
144 archsw.arch_copyout = i386_copyout;
145 archsw.arch_readin = i386_readin;
146 archsw.arch_isainb = isa_inb;
147 archsw.arch_isaoutb = isa_outb;
149 interact(); /* doesn't return */
151 /* if we ever get here, it is an error */
156 * Set the 'current device' by (if possible) recovering the boot device as
157 * supplied by the initial bootstrap.
159 * XXX should be extended for netbooting.
162 extract_currdev(void)
164 struct i386_devdesc new_currdev;
165 int major, biosdev = -1;
167 /* Assume we are booting from a BIOS disk by default */
168 new_currdev.d_dev = &biosdisk;
170 /* new-style boot loaders such as pxeldr and cdldr */
171 if (kargs->bootinfo == NULL) {
172 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
173 /* we are booting from a CD with cdboot */
174 new_currdev.d_dev = &bioscd;
175 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
176 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
177 /* we are booting from pxeldr */
178 new_currdev.d_dev = &pxedisk;
179 new_currdev.d_kind.netif.unit = 0;
181 /* we don't know what our boot device is */
182 new_currdev.d_kind.biosdisk.slice = -1;
183 new_currdev.d_kind.biosdisk.partition = 0;
186 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
187 /* The passed-in boot device is bad */
188 new_currdev.d_kind.biosdisk.slice = -1;
189 new_currdev.d_kind.biosdisk.partition = 0;
192 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
193 B_CONTROLLER(initial_bootdev) - 1;
194 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
195 biosdev = initial_bootinfo->bi_bios_dev;
196 major = B_TYPE(initial_bootdev);
199 * If we are booted by an old bootstrap, we have to guess at the BIOS
200 * unit number. We will loose if there is more than one disk type
201 * and we are not booting from the lowest-numbered disk type
202 * (ie. SCSI when IDE also exists).
205 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */
206 if (B_TYPE(initial_bootdev) == 6)
207 biosdev = 0x30 + B_UNIT(initial_bootdev);
209 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev);
212 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
213 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
216 new_currdev.d_type = new_currdev.d_dev->dv_type;
219 * If we are booting off of a BIOS disk and we didn't succeed in determining
220 * which one we booted off of, just use disk0: as a reasonable default.
222 if ((new_currdev.d_type == biosdisk.dv_type) &&
223 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
224 printf("Can't work out which disk we are booting from.\n"
225 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
226 new_currdev.d_kind.biosdisk.unit = 0;
228 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
229 i386_setcurrdev, env_nounset);
230 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
234 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
237 command_reboot(int argc, char *argv[])
241 for (i = 0; devsw[i] != NULL; ++i)
242 if (devsw[i]->dv_cleanup != NULL)
243 (devsw[i]->dv_cleanup)();
245 printf("Rebooting...\n");
250 /* provide this for panic, as it's not in the startup code */
257 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
260 command_heap(int argc, char *argv[])
263 printf("heap base at %p, top at %p\n", end, sbrk(0));
267 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
273 if (__builtin_constant_p(port) &&
274 (((port) & 0xffff) < 0x100) &&
275 ((port) < 0x10000)) {
276 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
278 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
284 isa_outb(int port, int value)
288 if (__builtin_constant_p(port) &&
289 (((port) & 0xffff) < 0x100) &&
290 ((port) < 0x10000)) {
291 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
293 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));