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 Robert Nordier
35 * All rights reserved.
37 * Redistribution and use in source and binary forms are freely
38 * permitted provided that the above copyright notice and this
39 * paragraph and the following disclaimer are duplicated in all
42 * This software is provided "AS IS" and without any express or
43 * implied warranties, including, without limitation, the implied
44 * warranties of merchantability and fitness for a particular
47 * $FreeBSD: src/sys/boot/i386/boot2/boot2.c,v 1.64 2003/08/25 23:28:31 obrien Exp $
48 * $DragonFly: src/sys/boot/pc32/boot2/boot2.c,v 1.18 2008/09/13 11:45:45 corecode Exp $
54 #include <sys/param.h>
56 #include <sys/disklabel64.h>
58 #include <sys/disklabel32.h>
60 #include <sys/diskslice.h>
61 #include <sys/diskmbr.h>
62 #include <sys/dtype.h>
63 #include <sys/dirent.h>
64 #include <machine/bootinfo.h>
65 #include <machine/elf.h>
80 #include "../bootasm.h"
82 #define SECOND 18 /* Circa that many ticks in a second. */
84 #define RBX_ASKNAME 0x0 /* -a */
85 #define RBX_SINGLE 0x1 /* -s */
86 #define RBX_DFLTROOT 0x5 /* -r */
87 #define RBX_KDB 0x6 /* -d */
88 #define RBX_CONFIG 0xa /* -c */
89 #define RBX_VERBOSE 0xb /* -v */
90 #define RBX_SERIAL 0xc /* -h */
91 #define RBX_CDROM 0xd /* -C */
92 #define RBX_GDB 0xf /* -g */
93 #define RBX_MUTE 0x10 /* -m */
94 #define RBX_PAUSE 0x12 /* -p */
95 #define RBX_NOINTR 0x1c /* -n */
96 #define RBX_VIDEO 0x1d /* -V */
97 #define RBX_PROBEKBD 0x1e /* -P */
98 /* 0x1f is reserved for the historical RB_BOOTINFO option */
100 #define RBF_MUTE (1 << RBX_MUTE)
101 #define RBF_SERIAL (1 << RBX_SERIAL)
102 #define RBF_VIDEO (1 << RBX_VIDEO)
104 /* pass: -a, -s, -r, -d, -c, -v, -h, -C, -g, -m, -p, -V */
105 #define RBX_MASK 0x2005ffff
107 #define PATH_CONFIG "/boot.config"
108 #define PATH_BOOT3 "/boot/loader" /* /boot in root */
109 #define PATH_BOOT3_ALT "/loader" /* /boot partition */
110 #define PATH_KERNEL "/kernel"
113 #define MEM_BASE 0x12
115 #define V86_CY(x) ((x) & 1)
116 #define V86_ZR(x) ((x) & 0x40)
118 #define DRV_HARD 0x80
119 #define DRV_MASK 0x7f
123 #define TYPE_MAXHARD TYPE_DA
128 #define INVALID_S "Bad %s\n"
130 extern uint32_t _end;
132 static const char optstr[NOPT] = { "VhaCgmnPprsv" };
133 static const unsigned char flags[NOPT] = {
148 static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
149 static const unsigned char dev_maj[NDEV] = {30, 4, 2};
160 static char cmd[512];
161 static char kname[1024];
162 static uint32_t opts;
163 static struct bootinfo bootinfo;
165 static int ls, dsk_meta;
166 static uint32_t fs_off;
169 static void load(void);
170 static int parse(void);
171 static int xfsread(ino_t, void *, size_t);
172 static int dskread(void *, unsigned, unsigned);
173 static void printf(const char *,...);
174 static void putchar(int);
175 static uint32_t memsize(void);
176 static int drvread(void *, unsigned, unsigned);
177 static int keyhit(unsigned);
178 static void xputc(int);
179 static int xgetc(int);
180 static int getc(int);
183 memcpy(void *d, const void *s, int len)
202 strcmp(const char *s1, const char *s2)
204 for (; *s1 == *s2 && *s1; s1++, s2++);
205 return (unsigned char)*s1 - (unsigned char)*s2;
209 #include "hammerread.c"
215 xfsread(ino_t inode, void *buf, size_t nbyte)
217 if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
218 printf(INVALID_S, "format");
224 static inline uint32_t
241 switch (c = xgetc(0)) {
256 if (s - cmd < sizeof(cmd) - 1)
267 v86.eax = 0xe00 | (c & 0xff);
278 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
280 dsk.drive = *(uint8_t *)PTOV(MEM_BTX_USR_ARG);
281 dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
282 dsk.unit = dsk.drive & DRV_MASK;
283 dsk.slice = *(uint8_t *)PTOV(MEM_BTX_USR_ARG + 1) + 1;
284 bootinfo.bi_version = BOOTINFO_VERSION;
285 bootinfo.bi_size = sizeof(bootinfo);
286 bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */
287 bootinfo.bi_extmem = memsize();
288 bootinfo.bi_memsizes_valid++;
290 /* Process configuration file */
294 if ((ino = lookup(PATH_CONFIG)))
295 fsread(ino, cmd, sizeof(cmd));
298 printf("%s: %s", PATH_CONFIG, cmd);
301 /* Do not process this command twice */
306 * Setup our (serial) console after processing the config file. If
307 * the initialization fails, don't try to use the serial port. This
308 * can happen if the serial port is unmaped (happens on new laptops a lot).
310 if ((opts & (RBF_MUTE|RBF_SERIAL|RBF_VIDEO)) == 0)
311 opts |= RBF_SERIAL|RBF_VIDEO;
312 if (opts & RBF_SERIAL) {
319 * Try to exec stage 3 boot loader. If interrupted by a keypress,
320 * or in case of failure, try to load a kernel directly instead.
322 * We have to try boot /boot/loader and /loader to support booting
323 * from a /boot partition instead of a root partition.
325 if (autoboot && !*kname) {
326 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
327 if (!keyhit(3*SECOND)) {
329 memcpy(kname, PATH_BOOT3_ALT, sizeof(PATH_BOOT3_ALT));
331 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
335 /* Present the user with the boot2 prompt. */
338 printf("\nDragonFly boot\n"
340 dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
341 'a' + dsk.part, kname);
342 if (!autoboot || keyhit(5*SECOND))
354 /* XXX - Needed for btxld to link the boot2 binary; do not remove. */
374 if (!(ino = lookup(kname))) {
376 printf("No %s\n", kname);
379 if (xfsread(ino, &hdr, sizeof(hdr)))
381 if (N_GETMAGIC(hdr.ex) == ZMAGIC)
383 else if (IS_ELF(hdr.eh))
386 printf(INVALID_S, "format");
390 addr = hdr.ex.a_entry & 0xffffff;
393 if (xfsread(ino, p, hdr.ex.a_text))
395 p += roundup2(hdr.ex.a_text, PAGE_SIZE);
396 if (xfsread(ino, p, hdr.ex.a_data))
398 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
399 bootinfo.bi_symtab = VTOP(p);
400 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
401 p += sizeof(hdr.ex.a_syms);
403 if (xfsread(ino, p, hdr.ex.a_syms))
406 if (xfsread(ino, p, sizeof(int)))
411 if (xfsread(ino, p, x))
416 fs_off = hdr.eh.e_phoff;
417 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
418 if (xfsread(ino, ep + j, sizeof(ep[0])))
420 if (ep[j].p_type == PT_LOAD)
423 for (i = 0; i < 2; i++) {
424 p = PTOV(ep[i].p_paddr & 0xffffff);
425 fs_off = ep[i].p_offset;
426 if (xfsread(ino, p, ep[i].p_filesz))
429 p += roundup2(ep[1].p_memsz, PAGE_SIZE);
430 bootinfo.bi_symtab = VTOP(p);
431 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
432 fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
433 (hdr.eh.e_shstrndx + 1);
434 if (xfsread(ino, &es, sizeof(es)))
436 for (i = 0; i < 2; i++) {
437 memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
438 p += sizeof(es[i].sh_size);
439 fs_off = es[i].sh_offset;
440 if (xfsread(ino, p, es[i].sh_size))
445 addr = hdr.eh.e_entry & 0xffffff;
447 bootinfo.bi_esymtab = VTOP(p);
448 bootinfo.bi_kernelname = VTOP(kname);
449 bootinfo.bi_bios_dev = dsk.drive;
450 __exec((caddr_t)addr, opts & RBX_MASK,
451 MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
452 0, 0, 0, VTOP(&bootinfo));
463 while ((c = *arg++)) {
464 if (c == ' ' || c == '\t' || c == '\n')
466 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++)
471 while ((c = *arg++)) {
472 for (i = NOPT - 1; i >= 0; --i) {
473 if (optstr[i] == c) {
474 opts ^= 1 << flags[i];
479 ok: ; /* ugly but save space */
481 if (opts & (1 << RBX_PROBEKBD)) {
482 i = *(uint8_t *)PTOV(0x496) & 0x10;
485 opts |= RBF_VIDEO | RBF_SERIAL;
487 opts &= ~(1 << RBX_PROBEKBD);
490 for (q = arg--; *q && *q != '('; q++);
501 for (i = 0; arg[0] != dev_nm[i][0] ||
502 arg[1] != dev_nm[i][1]; i++)
507 dsk.unit = *arg - '0';
508 if (arg[1] != ',' || dsk.unit > 9)
511 dsk.slice = WHOLE_DISK_SLICE;
513 dsk.slice = *arg - '0' + 1;
514 if (dsk.slice > NDOSPART)
520 dsk.part = *arg - 'a';
526 dsk.drive = (dsk.type <= TYPE_MAXHARD
527 ? DRV_HARD : 0) + drv;
530 if ((i = p - arg - !*(p - 1))) {
531 if ((size_t)i >= sizeof(kname))
533 memcpy(kname, arg, i + 1);
542 dskread(void *buf, unsigned lba, unsigned nblk)
544 struct dos_partition *dp;
546 struct disklabel64 *d;
548 struct disklabel32 *d;
554 sec = dmadat->secbuf;
556 if (drvread(sec, DOSBBSECTOR, 1))
558 dp = (void *)(sec + DOSPARTOFF);
560 if (sl < BASE_SLICE) {
561 for (i = 0; i < NDOSPART; i++)
562 if (dp[i].dp_typ == DOSPTYP_386BSD &&
563 (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
565 if (dp[i].dp_flag & 0x80 ||
566 dsk.slice == COMPATIBILITY_SLICE)
569 if (dsk.slice == WHOLE_DISK_SLICE)
572 if (sl != WHOLE_DISK_SLICE) {
573 if (sl != COMPATIBILITY_SLICE)
574 dp += sl - BASE_SLICE;
575 if (dp->dp_typ != DOSPTYP_386BSD) {
576 printf(INVALID_S, "slice");
579 dsk.start = dp->dp_start;
582 if (drvread(sec, dsk.start, (sizeof(struct disklabel64) + 511) / 512))
585 if (d->d_magic != DISKMAGIC64) {
586 printf(INVALID_S, "label");
589 if (dsk.part >= d->d_npartitions || d->d_partitions[dsk.part].p_bsize == 0) {
590 printf(INVALID_S, "partition");
593 dsk.start += d->d_partitions[dsk.part].p_boffset / 512;
596 if (drvread(sec, dsk.start + LABELSECTOR32, 1))
598 d = (void *)(sec + LABELOFFSET32);
599 if (d->d_magic != DISKMAGIC32 || d->d_magic2 != DISKMAGIC32) {
600 if (dsk.part != RAW_PART) {
601 printf(INVALID_S, "label");
606 if (d->d_type == DTYPE_SCSI)
610 if (dsk.part >= d->d_npartitions ||
611 !d->d_partitions[dsk.part].p_size) {
612 printf(INVALID_S, "partition");
615 dsk.start += d->d_partitions[dsk.part].p_offset;
616 dsk.start -= d->d_partitions[RAW_PART].p_offset;
620 return drvread(buf, dsk.start + lba, nblk);
624 printf(const char *fmt,...)
633 while ((c = *fmt++)) {
638 putchar(va_arg(ap, int));
641 for (s = va_arg(ap, char *); *s; s++)
645 u = va_arg(ap, unsigned);
648 *s++ = '0' + u % 10U;
670 drvread(void *buf, unsigned lba, unsigned nblk)
672 static unsigned c = 0x2d5c7c2f; /* twiddle */
674 c = (c << 8) | (c >> 24);
677 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
678 v86.addr = XREADORG; /* call to xread in boot1 */
679 v86.es = VTOPSEG(buf);
681 v86.ebx = VTOPOFF(buf);
683 v86.edx = nblk << 8 | dsk.drive;
686 if (V86_CY(v86.efl)) {
687 printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
694 keyhit(unsigned ticks)
698 if (opts & 1 << RBX_NOINTR)
704 t1 = *(uint32_t *)PTOV(0x46c);
707 if (t1 < t0 || t1 >= t0 + ticks)
715 if (opts & RBF_VIDEO)
717 if (opts & RBF_SERIAL)
724 if (opts & 1 << RBX_NOINTR)
727 if ((opts & RBF_VIDEO) && getc(1))
728 return fn ? 1 : getc(0);
729 if ((opts & RBF_SERIAL) && sio_ischar())
730 return fn ? 1 : sio_getc();
742 return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);