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 1.16 2007/06/18 05:13:42 dillon Exp $
50 #include <sys/param.h>
51 #include <sys/disklabel32.h>
52 #include <sys/diskslice.h>
53 #include <sys/diskmbr.h>
54 #include <sys/dtype.h>
55 #include <sys/dirent.h>
56 #include <machine/bootinfo.h>
57 #include <machine/elf.h>
67 #include "../bootasm.h"
69 #define SECOND 18 /* Circa that many ticks in a second. */
71 #define RBX_ASKNAME 0x0 /* -a */
72 #define RBX_SINGLE 0x1 /* -s */
73 #define RBX_DFLTROOT 0x5 /* -r */
74 #define RBX_KDB 0x6 /* -d */
75 #define RBX_CONFIG 0xa /* -c */
76 #define RBX_VERBOSE 0xb /* -v */
77 #define RBX_SERIAL 0xc /* -h */
78 #define RBX_CDROM 0xd /* -C */
79 #define RBX_GDB 0xf /* -g */
80 #define RBX_MUTE 0x10 /* -m */
81 #define RBX_PAUSE 0x12 /* -p */
82 #define RBX_NOINTR 0x1c /* -n */
83 #define RBX_VIDEO 0x1d /* -V */
84 #define RBX_PROBEKBD 0x1e /* -P */
85 /* 0x1f is reserved for the historical RB_BOOTINFO option */
87 #define RBF_MUTE (1 << RBX_MUTE)
88 #define RBF_SERIAL (1 << RBX_SERIAL)
89 #define RBF_VIDEO (1 << RBX_VIDEO)
91 /* pass: -a, -s, -r, -d, -c, -v, -h, -C, -g, -m, -p, -V */
92 #define RBX_MASK 0x2005ffff
94 #define PATH_CONFIG "/boot.config"
95 #define PATH_BOOT3 "/boot/loader"
96 #define PATH_KERNEL "/kernel"
101 #define V86_CY(x) ((x) & 1)
102 #define V86_ZR(x) ((x) & 0x40)
104 #define DRV_HARD 0x80
105 #define DRV_MASK 0x7f
109 #define TYPE_MAXHARD TYPE_DA
114 #define INVALID_S "Bad %s\n"
116 extern uint32_t _end;
118 static const char optstr[NOPT] = { "VhaCgmnPprsv" };
119 static const unsigned char flags[NOPT] = {
134 static const char *const dev_nm[NDEV] = {"ad", "da", "fd"};
135 static const unsigned char dev_maj[NDEV] = {30, 4, 2};
146 static char cmd[512];
147 static char kname[1024];
148 static uint32_t opts;
149 static struct bootinfo bootinfo;
152 static void load(void);
153 static int parse(void);
154 static int xfsread(ino_t, void *, size_t);
155 static int dskread(void *, unsigned, unsigned);
156 static void printf(const char *,...);
157 static void putchar(int);
158 static uint32_t memsize(void);
159 static int drvread(void *, unsigned, unsigned);
160 static int keyhit(unsigned);
161 static void xputc(int);
162 static int xgetc(int);
163 static int getc(int);
166 memcpy(void *d, const void *s, int len)
185 strcmp(const char *s1, const char *s2)
187 for (; *s1 == *s2 && *s1; s1++, s2++);
188 return (unsigned char)*s1 - (unsigned char)*s2;
194 xfsread(ino_t inode, void *buf, size_t nbyte)
196 if ((size_t)fsread(inode, buf, nbyte) != nbyte) {
197 printf(INVALID_S, "format");
203 static inline uint32_t
220 switch (c = xgetc(0)) {
235 if (s - cmd < sizeof(cmd) - 1)
246 v86.eax = 0xe00 | (c & 0xff);
257 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base);
259 dsk.drive = *(uint8_t *)PTOV(MEM_BTX_USR_ARG);
260 dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD;
261 dsk.unit = dsk.drive & DRV_MASK;
262 dsk.slice = *(uint8_t *)PTOV(MEM_BTX_USR_ARG + 1) + 1;
263 bootinfo.bi_version = BOOTINFO_VERSION;
264 bootinfo.bi_size = sizeof(bootinfo);
265 bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */
266 bootinfo.bi_extmem = memsize();
267 bootinfo.bi_memsizes_valid++;
269 /* Process configuration file */
273 if ((ino = lookup(PATH_CONFIG)))
274 fsread(ino, cmd, sizeof(cmd));
277 printf("%s: %s", PATH_CONFIG, cmd);
280 /* Do not process this command twice */
285 * Setup our (serial) console after processing the config file. If
286 * the initialization fails, don't try to use the serial port. This
287 * can happen if the serial port is unmaped (happens on new laptops a lot).
289 if ((opts & (RBF_MUTE|RBF_SERIAL|RBF_VIDEO)) == 0)
290 opts |= RBF_SERIAL|RBF_VIDEO;
291 if (opts & RBF_SERIAL) {
298 * Try to exec stage 3 boot loader. If interrupted by a keypress,
299 * or in case of failure, try to load a kernel directly instead.
302 if (autoboot && !*kname) {
303 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3));
304 if (!keyhit(3*SECOND)) {
306 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL));
310 /* Present the user with the boot2 prompt. */
313 printf("\nDragonFly boot\n"
315 dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit,
316 'a' + dsk.part, kname);
317 if (!autoboot || keyhit(5*SECOND))
329 /* XXX - Needed for btxld to link the boot2 binary; do not remove. */
349 if (!(ino = lookup(kname))) {
351 printf("No %s\n", kname);
354 if (xfsread(ino, &hdr, sizeof(hdr)))
356 if (N_GETMAGIC(hdr.ex) == ZMAGIC)
358 else if (IS_ELF(hdr.eh))
361 printf(INVALID_S, "format");
365 addr = hdr.ex.a_entry & 0xffffff;
368 if (xfsread(ino, p, hdr.ex.a_text))
370 p += roundup2(hdr.ex.a_text, PAGE_SIZE);
371 if (xfsread(ino, p, hdr.ex.a_data))
373 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE);
374 bootinfo.bi_symtab = VTOP(p);
375 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms));
376 p += sizeof(hdr.ex.a_syms);
378 if (xfsread(ino, p, hdr.ex.a_syms))
381 if (xfsread(ino, p, sizeof(int)))
386 if (xfsread(ino, p, x))
391 fs_off = hdr.eh.e_phoff;
392 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) {
393 if (xfsread(ino, ep + j, sizeof(ep[0])))
395 if (ep[j].p_type == PT_LOAD)
398 for (i = 0; i < 2; i++) {
399 p = PTOV(ep[i].p_paddr & 0xffffff);
400 fs_off = ep[i].p_offset;
401 if (xfsread(ino, p, ep[i].p_filesz))
404 p += roundup2(ep[1].p_memsz, PAGE_SIZE);
405 bootinfo.bi_symtab = VTOP(p);
406 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) {
407 fs_off = hdr.eh.e_shoff + sizeof(es[0]) *
408 (hdr.eh.e_shstrndx + 1);
409 if (xfsread(ino, &es, sizeof(es)))
411 for (i = 0; i < 2; i++) {
412 memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size));
413 p += sizeof(es[i].sh_size);
414 fs_off = es[i].sh_offset;
415 if (xfsread(ino, p, es[i].sh_size))
420 addr = hdr.eh.e_entry & 0xffffff;
422 bootinfo.bi_esymtab = VTOP(p);
423 bootinfo.bi_kernelname = VTOP(kname);
424 bootinfo.bi_bios_dev = dsk.drive;
425 __exec((caddr_t)addr, opts & RBX_MASK,
426 MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part),
427 0, 0, 0, VTOP(&bootinfo));
438 while ((c = *arg++)) {
439 if (c == ' ' || c == '\t' || c == '\n')
441 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++)
446 while ((c = *arg++)) {
447 for (i = NOPT - 1; i >= 0; --i) {
448 if (optstr[i] == c) {
449 opts ^= 1 << flags[i];
454 ok: ; /* ugly but save space */
456 if (opts & (1 << RBX_PROBEKBD)) {
457 i = *(uint8_t *)PTOV(0x496) & 0x10;
460 opts |= RBF_VIDEO | RBF_SERIAL;
462 opts &= ~(1 << RBX_PROBEKBD);
465 for (q = arg--; *q && *q != '('; q++);
476 for (i = 0; arg[0] != dev_nm[i][0] ||
477 arg[1] != dev_nm[i][1]; i++)
482 dsk.unit = *arg - '0';
483 if (arg[1] != ',' || dsk.unit > 9)
486 dsk.slice = WHOLE_DISK_SLICE;
488 dsk.slice = *arg - '0' + 1;
489 if (dsk.slice > NDOSPART)
495 dsk.part = *arg - 'a';
501 dsk.drive = (dsk.type <= TYPE_MAXHARD
502 ? DRV_HARD : 0) + drv;
505 if ((i = p - arg - !*(p - 1))) {
506 if ((size_t)i >= sizeof(kname))
508 memcpy(kname, arg, i + 1);
517 dskread(void *buf, unsigned lba, unsigned nblk)
519 struct dos_partition *dp;
520 struct disklabel32 *d;
525 sec = dmadat->secbuf;
527 if (drvread(sec, DOSBBSECTOR, 1))
529 dp = (void *)(sec + DOSPARTOFF);
531 if (sl < BASE_SLICE) {
532 for (i = 0; i < NDOSPART; i++)
533 if (dp[i].dp_typ == DOSPTYP_386BSD &&
534 (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) {
536 if (dp[i].dp_flag & 0x80 ||
537 dsk.slice == COMPATIBILITY_SLICE)
540 if (dsk.slice == WHOLE_DISK_SLICE)
543 if (sl != WHOLE_DISK_SLICE) {
544 if (sl != COMPATIBILITY_SLICE)
545 dp += sl - BASE_SLICE;
546 if (dp->dp_typ != DOSPTYP_386BSD) {
547 printf(INVALID_S, "slice");
550 dsk.start = dp->dp_start;
552 if (drvread(sec, dsk.start + LABELSECTOR32, 1))
554 d = (void *)(sec + LABELOFFSET32);
555 if (d->d_magic != DISKMAGIC32 || d->d_magic2 != DISKMAGIC32) {
556 if (dsk.part != RAW_PART) {
557 printf(INVALID_S, "label");
562 if (d->d_type == DTYPE_SCSI)
566 if (dsk.part >= d->d_npartitions ||
567 !d->d_partitions[dsk.part].p_size) {
568 printf(INVALID_S, "partition");
571 dsk.start += d->d_partitions[dsk.part].p_offset;
572 dsk.start -= d->d_partitions[RAW_PART].p_offset;
575 return drvread(buf, dsk.start + lba, nblk);
579 printf(const char *fmt,...)
588 while ((c = *fmt++)) {
593 putchar(va_arg(ap, int));
596 for (s = va_arg(ap, char *); *s; s++)
600 u = va_arg(ap, unsigned);
603 *s++ = '0' + u % 10U;
625 drvread(void *buf, unsigned lba, unsigned nblk)
627 static unsigned c = 0x2d5c7c2f; /* twiddle */
629 c = (c << 8) | (c >> 24);
632 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS;
633 v86.addr = XREADORG; /* call to xread in boot1 */
634 v86.es = VTOPSEG(buf);
636 v86.ebx = VTOPOFF(buf);
638 v86.edx = nblk << 8 | dsk.drive;
641 if (V86_CY(v86.efl)) {
642 printf("error %u lba %u\n", v86.eax >> 8 & 0xff, lba);
649 keyhit(unsigned ticks)
653 if (opts & 1 << RBX_NOINTR)
659 t1 = *(uint32_t *)PTOV(0x46c);
662 if (t1 < t0 || t1 >= t0 + ticks)
670 if (opts & RBF_VIDEO)
672 if (opts & RBF_SERIAL)
679 if (opts & 1 << RBX_NOINTR)
682 if ((opts & RBF_VIDEO) && getc(1))
683 return fn ? 1 : getc(0);
684 if ((opts & RBF_SERIAL) && sio_ischar())
685 return fn ? 1 : sio_getc();
697 return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl);