1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
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30/*
31 * MD bootstrap main() and assorted miscellaneous
32 * commands.
33 */
34
35#include <stand.h>
36#include <string.h>
37#include <machine/bootinfo.h>
38#include <sys/reboot.h>
39
40#include "bootstrap.h"
41#include "libi386/libi386.h"
42#include "btxv86.h"
43
44#define KARGS_FLAGS_CD 0x1
45#define KARGS_FLAGS_PXE 0x2
46
47/* Arguments passed in from the boot1/boot2 loader */
48static struct
49{
50 u_int32_t howto;
51 u_int32_t bootdev;
52 u_int32_t bootflags;
53 u_int32_t pxeinfo;
54 u_int32_t res2;
55 u_int32_t bootinfo;
56} *kargs;
57
58static u_int32_t initial_howto;
59static u_int32_t initial_bootdev;
60static struct bootinfo *initial_bootinfo;
61
62struct arch_switch archsw; /* MI/MD interface boundary */
63
64static void extract_currdev(void);
65static int isa_inb(int port);
66static void isa_outb(int port, int value);
67void exit(int code);
68
69/* from vers.c */
70extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
71
72/* XXX debugging */
73extern char end[];
74
75int
76main(void)
77{
78 int i;
79
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;
85
86 /*
87 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
88 */
89 bios_getmem();
90
91 setheap((void *)end, (void *)bios_basemem);
92
93 /*
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
96 * can't do yet.
97 *
98 * We can use printf() etc. once this is done.
99 * If the previous boot stage has requested a serial console, prefer that.
100 */
101 if (initial_howto & RB_SERIAL)
102 setenv("console", "comconsole", 1);
103 if (initial_howto & RB_MUTE)
104 setenv("console", "nullconsole", 1);
105 cons_probe();
106
107 /*
108 * Initialise the block cache
109 */
110 bcache_init(32, 512); /* 16k cache XXX tune this */
111
112 /*
113 * Special handling for PXE and CD booting.
114 */
115 if (kargs->bootinfo == NULL) {
116 /*
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.
119 */
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);
124 }
125
126 /*
127 * March through the device switch probing for things.
128 */
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);
133
134#ifndef PC98
135 /* detect ACPI for future reference */
136 biosacpi_detect();
137#endif
138
139 printf("\n");
140 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
141 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
142
143 extract_currdev(); /* set $currdev and $loaddev */
144 setenv("LINES", "24", 1); /* optional */
145
146 archsw.arch_autoload = i386_autoload;
147 archsw.arch_getdev = i386_getdev;
148 archsw.arch_copyin = i386_copyin;
149 archsw.arch_copyout = i386_copyout;
150 archsw.arch_readin = i386_readin;
151 archsw.arch_isainb = isa_inb;
152 archsw.arch_isaoutb = isa_outb;
153
154 interact(); /* doesn't return */
155
156 /* if we ever get here, it is an error */
157 return (1);
158}
159
160/*
161 * Set the 'current device' by (if possible) recovering the boot device as
162 * supplied by the initial bootstrap.
163 *
164 * XXX should be extended for netbooting.
165 */
166static void
167extract_currdev(void)
168{
169 struct i386_devdesc new_currdev;
170 int major, biosdev = -1;
171
172 /* Assume we are booting from a BIOS disk by default */
173 new_currdev.d_dev = &biosdisk;
174
175 /* new-style boot loaders such as pxeldr and cdldr */
176 if (kargs->bootinfo == NULL) {
177 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
178 /* we are booting from a CD with cdboot */
179 new_currdev.d_dev = &bioscd;
180 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
181 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
182 /* we are booting from pxeldr */
183 new_currdev.d_dev = &pxedisk;
184 new_currdev.d_kind.netif.unit = 0;
185 } else {
186 /* we don't know what our boot device is */
187 new_currdev.d_kind.biosdisk.slice = -1;
188 new_currdev.d_kind.biosdisk.partition = 0;
189 biosdev = -1;
190 }
191 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
192 /* The passed-in boot device is bad */
193 new_currdev.d_kind.biosdisk.slice = -1;
194 new_currdev.d_kind.biosdisk.partition = 0;
195 biosdev = -1;
196 } else {
197 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) +
198 B_CONTROLLER(initial_bootdev) - 1;
199 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
200 biosdev = initial_bootinfo->bi_bios_dev;
201 major = B_TYPE(initial_bootdev);
202
203 /*
204 * If we are booted by an old bootstrap, we have to guess at the BIOS
205 * unit number. We will loose if there is more than one disk type
206 * and we are not booting from the lowest-numbered disk type
207 * (ie. SCSI when IDE also exists).
208 */
209#ifdef PC98
210 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */
211 if (B_TYPE(initial_bootdev) == 6)
212 biosdev = 0x30 + B_UNIT(initial_bootdev);
213 else
214 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev);
215 }
216#else
217 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
218 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
219#endif
220 }
221 new_currdev.d_type = new_currdev.d_dev->dv_type;
222
223 /*
224 * If we are booting off of a BIOS disk and we didn't succeed in determining
225 * which one we booted off of, just use disk0: as a reasonable default.
226 */
227 if ((new_currdev.d_type == biosdisk.dv_type) &&
228 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
229 printf("Can't work out which disk we are booting from.\n"
230 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
231 new_currdev.d_kind.biosdisk.unit = 0;
232 }
233 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
234 i386_setcurrdev, env_nounset);
235 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
236 env_nounset);
237}
238
239COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
240
241static int
242command_reboot(int argc, char *argv[])
243{
244 int i;
245
246 for (i = 0; devsw[i] != NULL; ++i)
247 if (devsw[i]->dv_cleanup != NULL)
248 (devsw[i]->dv_cleanup)();
249
250 printf("Rebooting...\n");
251 delay(1000000);
252 __exit(0);
253}
254
255/* provide this for panic, as it's not in the startup code */
256void
257exit(int code)
258{
259 __exit(code);
260}
261
262COMMAND_SET(heap, "heap", "show heap usage", command_heap);
263
264static int
265command_heap(int argc, char *argv[])
266{
267 mallocstats();
268 printf("heap base at %p, top at %p\n", end, sbrk(0));
269 return(CMD_OK);
270}
271
272/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
273static int
274isa_inb(int port)
275{
276 u_char data;
277
278 if (__builtin_constant_p(port) &&
279 (((port) & 0xffff) < 0x100) &&
280 ((port) < 0x10000)) {
281 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
282 } else {
283 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
284 }
285 return(data);
286}
287
288static void
289isa_outb(int port, int value)
290{
291 u_char al = value;
292
293 if (__builtin_constant_p(port) &&
294 (((port) & 0xffff) < 0x100) &&
295 ((port) < 0x10000)) {
296 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
297 } else {
298 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
299 }
300}
301
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