1 /*
2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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
16 * distribution.
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.
20 *
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
32 * SUCH DAMAGE.
33 *
34 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
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.
45 *
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
56 * SUCH DAMAGE.
57 *
58 * $FreeBSD: src/sys/boot/i386/loader/main.c,v 1.28 2003/08/25 23:28:32 obrien Exp $
59 */
60
61 /*
62 * MD bootstrap main() and assorted miscellaneous
63 * commands.
64 */
65
66 #include <stand.h>
67 #include <string.h>
68 #include <machine/bootinfo.h>
69 #include <machine/psl.h>
70 #include <sys/reboot.h>
71
72 #include "bootstrap.h"
73 #include "libi386/libi386.h"
74 #include "libi386/smbios.h"
75 #include "btxv86.h"
76
77 #define KARGS_FLAGS_CD 0x1
78 #define KARGS_FLAGS_PXE 0x2
79
80 /* Arguments passed in from the boot1/boot2 loader */
81 static struct
82 {
83 u_int32_t howto;
84 u_int32_t bootdev;
85 u_int32_t bootflags;
86 u_int32_t pxeinfo;
87 u_int32_t res2;
88 u_int32_t bootinfo;
89 } *kargs;
90
91 static u_int32_t initial_howto;
92 static u_int32_t initial_bootdev;
93 static struct bootinfo *initial_bootinfo;
94
95 struct arch_switch archsw; /* MI/MD interface boundary */
96
97 static void extract_currdev(void);
98 static int isa_inb(int port);
99 static void isa_outb(int port, int value);
100 void exit(int code);
101
102 /* from vers.c */
103 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
104
105 /* XXX debugging */
106 extern char _end[];
107
108 #define COMCONSOLE_DEBUG
109 #ifdef COMCONSOLE_DEBUG
110
111 static void
WDEBUG_INIT(void)112 WDEBUG_INIT(void)
113 {
114 isa_outb(0x3f8+3, 0x83); /* DLAB + 8N1 */
115 isa_outb(0x3f8+0, (115200 / 115200) & 0xFF);
116 isa_outb(0x3f8+1, (115200 / 115200) >> 8);
117 isa_outb(0x3f8+3, 0x03); /* 8N1 */
118 isa_outb(0x3f8+4, 0x03); /* RTS+DTR */
119 isa_outb(0x3f8+2, 0x01); /* FIFO_ENABLE */
120 }
121
122 static void
WDEBUG(char c)123 WDEBUG(char c)
124 {
125 isa_outb(0x3f8, c);
126 }
127
128 #else
129
130 #define WDEBUG(x)
131 #define WDEBUG_INIT()
132
133 #endif
134
135 int
main(void)136 main(void)
137 {
138 char *memend;
139 int i;
140
141 WDEBUG_INIT();
142 WDEBUG('X');
143
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;
149
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);
153 #endif
154
155 /* Initialize the v86 register set to a known-good state. */
156 bzero(&v86, sizeof(v86));
157 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
158
159
160 /*
161 * Initialize the heap as early as possible. Once this is done,
162 * malloc() is usable.
163 *
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.
169 *
170 * Be sure to use the virtual bios_basemem address rather then
171 * the physical bios_basemem address or we may overwrite BIOS
172 * data.
173 */
174 bios_getmem();
175 memend = (char *)&memend - 0x8000; /* space for stack (16K) */
176 memend = (char *)((uintptr_t)memend & ~(uintptr_t)(0x1000 - 1));
177
178 /*
179 * Steal the heap from high memory. bios_basemem no longer has
180 * enough space, last failure was the gunzip code for initrd.img
181 * needing > ~32KB of temporary buffer space and we ran out. again.
182 *
183 * High memory reserves at least ~1MB for the loader.
184 */
185 #if 0
186 if (memend < (char *)_end) {
187 setheap((void *)_end, PTOV(bios_basemem));
188 } else {
189 if (memend > (char *)PTOV(bios_basemem))
190 memend = (char *)PTOV(bios_basemem);
191 setheap((void *)_end, memend);
192 }
193 #endif
194 setheap((void *)heapbase, (void *)memtop);
195
196 /*
197 * XXX Chicken-and-egg problem; we want to have console output early,
198 * but some console attributes may depend on reading from eg. the boot
199 * device, which we can't do yet.
200 *
201 * We can use printf() etc. once this is done. The previous boot stage
202 * might have requested a video or serial preference, in which case we
203 * set it. If neither is specified or both are specified we leave the
204 * console environment variable alone, defaulting to dual boot.
205 */
206 if (initial_howto & RB_MUTE) {
207 setenv("console", "nullconsole", 1);
208 } else if ((initial_howto & (RB_VIDEO|RB_SERIAL)) != (RB_VIDEO|RB_SERIAL)) {
209 if (initial_howto & RB_VIDEO)
210 setenv("console", "vidconsole", 1);
211 if (initial_howto & RB_SERIAL)
212 setenv("console", "comconsole", 1);
213 }
214 cons_probe();
215
216 /*
217 * Initialise the block cache
218 */
219 bcache_init(32, 512); /* 16k cache XXX tune this */
220
221 /*
222 * Special handling for PXE and CD booting.
223 */
224 if (kargs->bootinfo == 0) {
225 /*
226 * We only want the PXE disk to try to init itself in the below
227 * walk through devsw if we actually booted off of PXE.
228 */
229 if (kargs->bootflags & KARGS_FLAGS_PXE)
230 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
231 else if (kargs->bootflags & KARGS_FLAGS_CD)
232 bc_add(initial_bootdev);
233 }
234
235 /*
236 * March through the device switch probing for things.
237 */
238 for (i = 0; devsw[i] != NULL; i++) {
239 WDEBUG('M' + i);
240 if (devsw[i]->dv_init != NULL)
241 (devsw[i]->dv_init)();
242 WDEBUG('M' + i);
243 }
244 printf("BIOS %dkB/%dkB available memory\n",
245 bios_basemem / 1024, bios_extmem / 1024);
246 if (initial_bootinfo != NULL) {
247 initial_bootinfo->bi_basemem = bios_basemem / 1024;
248 initial_bootinfo->bi_extmem = bios_extmem / 1024;
249 }
250
251 /* detect ACPI for future reference */
252 biosacpi_detect();
253
254 /* detect SMBIOS for future reference */
255 smbios_detect(NULL);
256
257 /* enable EHCI */
258 setenv("ehci_load", "YES", 1);
259
260 /* enable XHCI */
261 setenv("xhci_load", "YES", 1);
262
263 printf("\n");
264 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
265 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
266
267 extract_currdev(); /* set $currdev and $loaddev */
268 setenv("LINES", "24", 1); /* optional */
269
270 bios_getsmap();
271
272 archsw.arch_autoload = i386_autoload;
273 archsw.arch_getdev = i386_getdev;
274 archsw.arch_copyin = i386_copyin;
275 archsw.arch_copyout = i386_copyout;
276 archsw.arch_readin = i386_readin;
277 archsw.arch_isainb = isa_inb;
278 archsw.arch_isaoutb = isa_outb;
279
280 interact(); /* doesn't return */
281
282 /* if we ever get here, it is an error */
283 return (1);
284 }
285
286 /*
287 * Set the 'current device' by (if possible) recovering the boot device as
288 * supplied by the initial bootstrap.
289 *
290 * XXX should be extended for netbooting.
291 */
292 static void
extract_currdev(void)293 extract_currdev(void)
294 {
295 struct i386_devdesc new_currdev;
296 int biosdev = -1;
297
298 /* Assume we are booting from a BIOS disk by default */
299 new_currdev.d_dev = &biosdisk;
300
301 /* new-style boot loaders such as pxeldr and cdldr */
302 if (kargs->bootinfo == 0) {
303 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
304 /* we are booting from a CD with cdboot */
305 new_currdev.d_dev = &bioscd;
306 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev);
307 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
308 /* we are booting from pxeldr */
309 new_currdev.d_dev = &pxedisk;
310 new_currdev.d_kind.netif.unit = 0;
311 } else {
312 /* we don't know what our boot device is */
313 new_currdev.d_kind.biosdisk.slice = -1;
314 new_currdev.d_kind.biosdisk.partition = 0;
315 biosdev = -1;
316 }
317 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
318 /* The passed-in boot device is bad */
319 new_currdev.d_kind.biosdisk.slice = -1;
320 new_currdev.d_kind.biosdisk.partition = 0;
321 biosdev = -1;
322 } else {
323 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
324 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
325 biosdev = initial_bootinfo->bi_bios_dev;
326
327 /*
328 * If we are booted by an old bootstrap, we have to guess at the BIOS
329 * unit number. We will loose if there is more than one disk type
330 * and we are not booting from the lowest-numbered disk type
331 * (ie. SCSI when IDE also exists).
332 */
333 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
334 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
335 }
336 new_currdev.d_type = new_currdev.d_dev->dv_type;
337
338 /*
339 * If we are booting off of a BIOS disk and we didn't succeed in determining
340 * which one we booted off of, just use disk0: as a reasonable default.
341 */
342 if ((new_currdev.d_type == biosdisk.dv_type) &&
343 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) {
344 printf("Can't work out which disk we are booting from.\n"
345 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
346 new_currdev.d_kind.biosdisk.unit = 0;
347 }
348 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
349 i386_setcurrdev, env_nounset);
350 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
351 env_nounset);
352 }
353
354 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
355
356 static int
command_reboot(int argc,char * argv[])357 command_reboot(int argc, char *argv[])
358 {
359 int i;
360
361 for (i = 0; devsw[i] != NULL; ++i)
362 if (devsw[i]->dv_cleanup != NULL)
363 (devsw[i]->dv_cleanup)();
364
365 printf("Rebooting...\n");
366 delay(1000000);
367 __exit(0);
368 }
369
370 /* provide this for panic, as it's not in the startup code */
371 void
exit(int code)372 exit(int code)
373 {
374 __exit(code);
375 }
376
377 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
378
379 static int
command_heap(int argc,char * argv[])380 command_heap(int argc, char *argv[])
381 {
382 char *base;
383 size_t bytes;
384
385 mallocstats();
386 base = getheap(&bytes);
387 printf("heap %p-%p (%d)\n", base, base + bytes, (int)bytes);
388 printf("stack at %p\n", &argc);
389 return(CMD_OK);
390 }
391
392 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
393 static int
isa_inb(int port)394 isa_inb(int port)
395 {
396 u_char data;
397
398 if (__builtin_constant_p(port) &&
399 (((port) & 0xffff) < 0x100) &&
400 ((port) < 0x10000)) {
401 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
402 } else {
403 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
404 }
405 return(data);
406 }
407
408 static void
isa_outb(int port,int value)409 isa_outb(int port, int value)
410 {
411 u_char al = value;
412
413 if (__builtin_constant_p(port) &&
414 (((port) & 0xffff) < 0x100) &&
415 ((port) < 0x10000)) {
416 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
417 } else {
418 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
419 }
420 }
421
422