gptboot.c revision 107869
1/* 2 * Copyright (c) 1998 Robert Nordier 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are freely 6 * permitted provided that the above copyright notice and this 7 * paragraph and the following disclaimer are duplicated in all 8 * such forms. 9 * 10 * This software is provided "AS IS" and without any express or 11 * implied warranties, including, without limitation, the implied 12 * warranties of merchantability and fitness for a particular 13 * purpose. 14 */ 15 16/* 17 * $FreeBSD: head/sys/boot/i386/gptboot/gptboot.c 107869 2002-12-14 17:34:28Z phk $ 18 */ 19 20#include <sys/param.h> 21#include <sys/reboot.h> 22#include <sys/diskslice.h> 23#include <sys/disklabel.h> 24#include <sys/diskmbr.h> 25#include <sys/dirent.h> 26#include <machine/bootinfo.h> 27#include <machine/elf.h> 28 29#include <stdarg.h> 30 31#include <a.out.h> 32 33#include <btxv86.h> 34 35#include "boot2.h" 36#include "lib.h" 37 38#define IO_KEYBOARD 1 39#define IO_SERIAL 2 40 41#define SECOND 18 /* Circa that many ticks in a second. */ 42 43#define RBX_ASKNAME 0x0 /* -a */ 44#define RBX_SINGLE 0x1 /* -s */ 45#define RBX_DFLTROOT 0x5 /* -r */ 46#define RBX_KDB 0x6 /* -d */ 47#define RBX_CONFIG 0xa /* -c */ 48#define RBX_VERBOSE 0xb /* -v */ 49#define RBX_SERIAL 0xc /* -h */ 50#define RBX_CDROM 0xd /* -C */ 51#define RBX_GDB 0xf /* -g */ 52#define RBX_MUTE 0x10 /* -m */ 53#define RBX_PAUSE 0x12 /* -p */ 54#define RBX_DUAL 0x1d /* -D */ 55#define RBX_PROBEKBD 0x1e /* -P */ 56#define RBX_NOINTR 0x1f /* -n */ 57 58#define RBX_MASK 0x2005ffff 59 60#define PATH_CONFIG "/boot.config" 61#define PATH_BOOT3 "/boot/loader" 62#define PATH_KERNEL "/kernel" 63 64#define ARGS 0x900 65#define NOPT 14 66#define NDEV 5 67#define MEM_BASE 0x12 68#define MEM_EXT 0x15 69#define V86_CY(x) ((x) & 1) 70#define V86_ZR(x) ((x) & 0x40) 71 72#define DRV_HARD 0x80 73#define DRV_MASK 0x7f 74 75#define TYPE_AD 0 76#define TYPE_DA 2 77#define TYPE_MAXHARD TYPE_DA 78#define TYPE_FD 4 79 80extern uint32_t _end; 81 82static const char optstr[NOPT] = "DhaCcdgmnPprsv"; 83static const unsigned char flags[NOPT] = { 84 RBX_DUAL, 85 RBX_SERIAL, 86 RBX_ASKNAME, 87 RBX_CDROM, 88 RBX_CONFIG, 89 RBX_KDB, 90 RBX_GDB, 91 RBX_MUTE, 92 RBX_NOINTR, 93 RBX_PROBEKBD, 94 RBX_PAUSE, 95 RBX_DFLTROOT, 96 RBX_SINGLE, 97 RBX_VERBOSE 98}; 99 100static const char *const dev_nm[NDEV] = {"ad", "wd", "da", " ", "fd"}; 101static const unsigned char dev_maj[NDEV] = {30, 0, 4, 1, 2}; 102 103static struct dsk { 104 unsigned drive; 105 unsigned type; 106 unsigned unit; 107 unsigned slice; 108 unsigned part; 109 unsigned start; 110 int init; 111} dsk; 112static char cmd[512]; 113static char kname[1024]; 114static uint32_t opts = RB_BOOTINFO; 115static struct bootinfo bootinfo; 116static uint8_t ioctrl = IO_KEYBOARD; 117 118void exit(int); 119static void load(const char *); 120static int parse(char *); 121static int xfsread(ino_t, void *, size_t); 122static int dskread(void *, unsigned, unsigned); 123static void printf(const char *,...); 124static void putchar(int); 125static uint32_t memsize(int); 126static int drvread(void *, unsigned, unsigned); 127static int keyhit(unsigned); 128static int xputc(int); 129static int xgetc(int); 130static int getc(int); 131 132#if 1 133#define memcpy __builtin_memcpy 134#else 135static void memcpy(char *, const char *, int); 136static void 137memcpy(char *dst, const char *src, int len) 138{ 139 while (len--) 140 *dst++ = *src++; 141} 142#endif 143 144static inline int 145strcmp(const char *s1, const char *s2) 146{ 147 for (; *s1 == *s2 && *s1; s1++, s2++); 148 return (u_char)*s1 - (u_char)*s2; 149} 150 151#include "ufsread.c" 152 153static int 154xfsread(ino_t inode, void *buf, size_t nbyte) 155{ 156 if (fsread(inode, buf, nbyte) != nbyte) { 157 printf("Invalid %s\n", "format"); 158 return -1; 159 } 160 return 0; 161} 162 163static inline void 164getstr(char *str, int size) 165{ 166 char *s; 167 int c; 168 169 s = str; 170 for (;;) { 171 switch (c = xgetc(0)) { 172 case 0: 173 break; 174 case '\177': 175 c = '\b'; 176 case '\b': 177 if (s > str) { 178 s--; 179 putchar('\b'); 180 putchar(' '); 181 } else 182 c = 0; 183 break; 184 case '\n': 185 case '\r': 186 *s = 0; 187 return; 188 default: 189 if (s - str < size - 1) 190 *s++ = c; 191 } 192 if (c) 193 putchar(c); 194 } 195} 196 197static inline void 198putc(int c) 199{ 200 v86.addr = 0x10; 201 v86.eax = 0xe00 | (c & 0xff); 202 v86.ebx = 0x7; 203 v86int(); 204} 205 206int 207main(void) 208{ 209 int autoboot, i; 210 ino_t ino; 211 212 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); 213 v86.ctl = V86_FLAGS; 214 dsk.drive = *(uint8_t *)PTOV(ARGS); 215 dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD; 216 dsk.unit = dsk.drive & DRV_MASK; 217 dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1; 218 bootinfo.bi_version = BOOTINFO_VERSION; 219 bootinfo.bi_size = sizeof(bootinfo); 220 bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */ 221 bootinfo.bi_extmem = memsize(MEM_EXT); 222 bootinfo.bi_memsizes_valid++; 223 224 /* Process configuration file */ 225 226 autoboot = 1; 227 228 if ((ino = lookup(PATH_CONFIG))) 229 fsread(ino, cmd, sizeof(cmd)); 230 231 if (*cmd) { 232 printf("%s: %s", PATH_CONFIG, cmd); 233 if (parse(cmd)) 234 autoboot = 0; 235 /* Do not process this command twice */ 236 *cmd = 0; 237 } 238 239 /* 240 * Try to exec stage 3 boot loader. If interrupted by a keypress, 241 * or in case of failure, try to load a kernel directly instead. 242 */ 243 244 if (autoboot && !*kname) { 245 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3)); 246 if (!keyhit(3*SECOND)) { 247 load(kname); 248 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); 249 } 250 } 251 252 /* Present the user with the boot2 prompt. */ 253 254 for (;;) { 255#ifdef UFS1_ONLY 256 printf(" \n>> FreeBSD/i386/UFS1 BOOT\n" 257#else 258 printf(" \n>> FreeBSD/i386/UFS[12] BOOT\n" 259#endif 260 "Default: %u:%s(%u,%c)%s\n" 261 "boot: ", 262 dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit, 263 'a' + dsk.part, kname); 264 if (ioctrl & IO_SERIAL) 265 sio_flush(); 266 if (!autoboot || keyhit(5*SECOND)) 267 getstr(cmd, sizeof(cmd)); 268 else 269 putchar('\n'); 270 autoboot = 0; 271 if (parse(cmd)) 272 putchar('\a'); 273 else 274 load(kname); 275 } 276} 277 278/* XXX - Needed for btxld to link the boot2 binary; do not remove. */ 279void 280exit(int x) 281{ 282} 283 284static void 285load(const char *fname) 286{ 287 union { 288 struct exec ex; 289 Elf32_Ehdr eh; 290 } hdr; 291 Elf32_Phdr ep[2]; 292 Elf32_Shdr es[2]; 293 caddr_t p; 294 ino_t ino; 295 uint32_t addr, x; 296 int fmt, i, j; 297 298 if (!(ino = lookup(fname))) { 299 if (!ls) 300 printf("No %s\n", fname); 301 return; 302 } 303 if (xfsread(ino, &hdr, sizeof(hdr))) 304 return; 305 if (N_GETMAGIC(hdr.ex) == ZMAGIC) 306 fmt = 0; 307 else if (IS_ELF(hdr.eh)) 308 fmt = 1; 309 else { 310 printf("Invalid %s\n", "format"); 311 return; 312 } 313 if (fmt == 0) { 314 addr = hdr.ex.a_entry & 0xffffff; 315 p = PTOV(addr); 316 fs_off = PAGE_SIZE; 317 if (xfsread(ino, p, hdr.ex.a_text)) 318 return; 319 p += roundup2(hdr.ex.a_text, PAGE_SIZE); 320 if (xfsread(ino, p, hdr.ex.a_data)) 321 return; 322 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE); 323 bootinfo.bi_symtab = VTOP(p); 324 memcpy(p, (char *)&hdr.ex.a_syms, sizeof(hdr.ex.a_syms)); 325 p += sizeof(hdr.ex.a_syms); 326 if (hdr.ex.a_syms) { 327 if (xfsread(ino, p, hdr.ex.a_syms)) 328 return; 329 p += hdr.ex.a_syms; 330 if (xfsread(ino, p, sizeof(int))) 331 return; 332 x = *(uint32_t *)p; 333 p += sizeof(int); 334 x -= sizeof(int); 335 if (xfsread(ino, p, x)) 336 return; 337 p += x; 338 } 339 } else { 340 fs_off = hdr.eh.e_phoff; 341 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { 342 if (xfsread(ino, ep + j, sizeof(ep[0]))) 343 return; 344 if (ep[j].p_type == PT_LOAD) 345 j++; 346 } 347 for (i = 0; i < 2; i++) { 348 p = PTOV(ep[i].p_paddr & 0xffffff); 349 fs_off = ep[i].p_offset; 350 if (xfsread(ino, p, ep[i].p_filesz)) 351 return; 352 } 353 p += roundup2(ep[1].p_memsz, PAGE_SIZE); 354 bootinfo.bi_symtab = VTOP(p); 355 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { 356 fs_off = hdr.eh.e_shoff + sizeof(es[0]) * 357 (hdr.eh.e_shstrndx + 1); 358 if (xfsread(ino, &es, sizeof(es))) 359 return; 360 for (i = 0; i < 2; i++) { 361 memcpy(p, (char *)&es[i].sh_size, sizeof(es[i].sh_size)); 362 p += sizeof(es[i].sh_size); 363 fs_off = es[i].sh_offset; 364 if (xfsread(ino, p, es[i].sh_size)) 365 return; 366 p += es[i].sh_size; 367 } 368 } 369 addr = hdr.eh.e_entry & 0xffffff; 370 } 371 bootinfo.bi_esymtab = VTOP(p); 372 bootinfo.bi_kernelname = VTOP(fname); 373 bootinfo.bi_bios_dev = dsk.drive; 374 __exec((caddr_t)addr, opts & RBX_MASK, 375 MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part), 376 0, 0, 0, VTOP(&bootinfo)); 377} 378 379static int 380parse(char *arg) 381{ 382 char *p, *q; 383 int drv, c, i; 384 385 while ((c = *arg++)) { 386 if (c == ' ' || c == '\t' || c == '\n') 387 continue; 388 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++); 389 if (*p) 390 *p++ = 0; 391 if (c == '-') { 392 while ((c = *arg++)) { 393 for (i = 0; c != optstr[i]; i++) 394 if (i == NOPT - 1) 395 return -1; 396 opts ^= 1 << flags[i]; 397 } 398 if (opts & 1 << RBX_PROBEKBD) { 399 i = *(uint8_t *)PTOV(0x496) & 0x10; 400 /* printf("Keyboard: %s\n", i ? "yes" : "no"); */ 401 if (!i) 402 opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL; 403 opts &= ~(1 << RBX_PROBEKBD); 404 } 405 ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) : 406 opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD; 407 if (ioctrl & IO_SERIAL) 408 sio_init(); 409 } else { 410 for (q = arg--; *q && *q != '('; q++); 411 if (*q) { 412 drv = -1; 413 if (arg[1] == ':') { 414 if (*arg < '0' || *arg > '9') 415 return -1; 416 drv = *arg - '0'; 417 arg += 2; 418 } 419 if (q - arg != 2) 420 return -1; 421 for (i = 0; arg[0] != dev_nm[i][0] || 422 arg[1] != dev_nm[i][1]; i++) 423 if (i == NDEV - 1) 424 return -1; 425 dsk.type = i; 426 arg += 3; 427 if (arg[1] != ',' || *arg < '0' || *arg > '9') 428 return -1; 429 dsk.unit = *arg - '0'; 430 arg += 2; 431 dsk.slice = WHOLE_DISK_SLICE; 432 if (arg[1] == ',') { 433 if (*arg < '0' || *arg > '0' + NDOSPART) 434 return -1; 435 if ((dsk.slice = *arg - '0')) 436 dsk.slice++; 437 arg += 2; 438 } 439 if (arg[1] != ')' || *arg < 'a' || *arg > 'p') 440 return -1; 441 dsk.part = *arg - 'a'; 442 arg += 2; 443 if (drv == -1) 444 drv = dsk.unit; 445 dsk.drive = (dsk.type <= TYPE_MAXHARD 446 ? DRV_HARD : 0) + drv; 447 dsk_meta = 0; 448 fsread(0, NULL, 0); 449 } 450 if ((i = p - arg - !*(p - 1))) { 451 if (i >= sizeof(kname)) 452 return -1; 453 memcpy(kname, arg, i + 1); 454 } 455 } 456 arg = p; 457 } 458 return 0; 459} 460 461static int 462dskread(void *buf, unsigned lba, unsigned nblk) 463{ 464 struct dos_partition *dp; 465 struct disklabel *d; 466 char *sec; 467 unsigned sl, i; 468 469 if (!dsk_meta) { 470 sec = dmadat->secbuf; 471 dsk.start = 0; 472 if (drvread(sec, DOSBBSECTOR, 1)) 473 return -1; 474 dp = (void *)(sec + DOSPARTOFF); 475 sl = dsk.slice; 476 if (sl < BASE_SLICE) { 477 for (i = 0; i < NDOSPART; i++) 478 if (dp[i].dp_typ == DOSPTYP_386BSD && 479 (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) { 480 sl = BASE_SLICE + i; 481 if (dp[i].dp_flag & 0x80 || 482 dsk.slice == COMPATIBILITY_SLICE) 483 break; 484 } 485 if (dsk.slice == WHOLE_DISK_SLICE) 486 dsk.slice = sl; 487 } 488 if (sl != WHOLE_DISK_SLICE) { 489 if (sl != COMPATIBILITY_SLICE) 490 dp += sl - BASE_SLICE; 491 if (dp->dp_typ != DOSPTYP_386BSD) { 492 printf("Invalid %s\n", "slice"); 493 return -1; 494 } 495 dsk.start = dp->dp_start; 496 } 497 if (drvread(sec, dsk.start + LABELSECTOR, 1)) 498 return -1; 499 d = (void *)(sec + LABELOFFSET); 500 if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) { 501 if (dsk.part != RAW_PART) { 502 printf("Invalid %s\n", "label"); 503 return -1; 504 } 505 } else { 506 if (!dsk.init) { 507 if (d->d_type == DTYPE_SCSI) 508 dsk.type = TYPE_DA; 509 dsk.init++; 510 } 511 if (dsk.part >= d->d_npartitions || 512 !d->d_partitions[dsk.part].p_size) { 513 printf("Invalid %s\n", "partition"); 514 return -1; 515 } 516 dsk.start += d->d_partitions[dsk.part].p_offset; 517 dsk.start -= d->d_partitions[RAW_PART].p_offset; 518 } 519 } 520 return drvread(buf, dsk.start + lba, nblk); 521} 522 523static void 524printf(const char *fmt,...) 525{ 526 static const char digits[16] = "0123456789abcdef"; 527 va_list ap; 528 char buf[10]; 529 char *s; 530 unsigned r, u; 531 int c; 532 533 va_start(ap, fmt); 534 while ((c = *fmt++)) { 535 if (c == '%') { 536 c = *fmt++; 537 switch (c) { 538 case 'c': 539 putchar(va_arg(ap, int)); 540 continue; 541 case 's': 542 for (s = va_arg(ap, char *); *s; s++) 543 putchar(*s); 544 continue; 545 case 'u': 546 case 'x': 547 r = c == 'u' ? 10U : 16U; 548 u = va_arg(ap, unsigned); 549 s = buf; 550 do 551 *s++ = digits[u % r]; 552 while (u /= r); 553 while (--s >= buf) 554 putchar(*s); 555 continue; 556 } 557 } 558 putchar(c); 559 } 560 va_end(ap); 561 return; 562} 563 564static void 565putchar(int c) 566{ 567 if (c == '\n') 568 xputc('\r'); 569 xputc(c); 570} 571 572static uint32_t 573memsize(int type) 574{ 575 v86.addr = type; 576 v86.eax = 0x8800; 577 v86int(); 578 return v86.eax; 579} 580 581static int 582drvread(void *buf, unsigned lba, unsigned nblk) 583{ 584 static unsigned c = 0x2d5c7c2f; 585 586 printf("%c\b", c = c << 8 | c >> 24); 587 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS; 588 v86.addr = XREADORG; /* call to xread in boot1 */ 589 v86.es = VTOPSEG(buf); 590 v86.eax = lba; 591 v86.ebx = VTOPOFF(buf); 592 v86.ecx = lba >> 16; 593 v86.edx = nblk << 8 | dsk.drive; 594 v86int(); 595 v86.ctl = V86_FLAGS; 596 if (V86_CY(v86.efl)) { 597 printf("Disk error 0x%x lba 0x%x\n", v86.eax >> 8 & 0xff, lba); 598 return -1; 599 } 600 return 0; 601} 602 603static int 604keyhit(unsigned ticks) 605{ 606 uint32_t t0, t1; 607 608 if (opts & 1 << RBX_NOINTR) 609 return 0; 610 t0 = 0; 611 for (;;) { 612 if (xgetc(1)) 613 return 1; 614 t1 = *(uint32_t *)PTOV(0x46c); 615 if (!t0) 616 t0 = t1; 617 if (t1 < t0 || t1 >= t0 + ticks) 618 return 0; 619 } 620} 621 622static int 623xputc(int c) 624{ 625 if (ioctrl & IO_KEYBOARD) 626 putc(c); 627 if (ioctrl & IO_SERIAL) 628 sio_putc(c); 629 return c; 630} 631 632static int 633xgetc(int fn) 634{ 635 if (opts & 1 << RBX_NOINTR) 636 return 0; 637 for (;;) { 638 if (ioctrl & IO_KEYBOARD && getc(1)) 639 return fn ? 1 : getc(0); 640 if (ioctrl & IO_SERIAL && sio_ischar()) 641 return fn ? 1 : sio_getc(); 642 if (fn) 643 return 0; 644 } 645} 646 647static int 648getc(int fn) 649{ 650 v86.addr = 0x16; 651 v86.eax = fn << 8; 652 v86int(); 653 return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl); 654} 655