gptboot.c revision 107889
122514Sdarrenr/* 222514Sdarrenr * Copyright (c) 1998 Robert Nordier 322514Sdarrenr * All rights reserved. 422514Sdarrenr * 522514Sdarrenr * Redistribution and use in source and binary forms are freely 622514Sdarrenr * permitted provided that the above copyright notice and this 722514Sdarrenr * paragraph and the following disclaimer are duplicated in all 822514Sdarrenr * such forms. 922514Sdarrenr * 1022514Sdarrenr * This software is provided "AS IS" and without any express or 1122514Sdarrenr * implied warranties, including, without limitation, the implied 1222514Sdarrenr * warranties of merchantability and fitness for a particular 1322514Sdarrenr * purpose. 1422514Sdarrenr */ 1522514Sdarrenr 1622514Sdarrenr/* 1722514Sdarrenr * $FreeBSD: head/sys/boot/i386/gptboot/gptboot.c 107889 2002-12-15 02:15:19Z obrien $ 1822514Sdarrenr */ 1922514Sdarrenr 2022514Sdarrenr#include <sys/param.h> 2122514Sdarrenr#include <sys/reboot.h> 2222514Sdarrenr#include <sys/diskslice.h> 2322514Sdarrenr#include <sys/disklabel.h> 2422514Sdarrenr#include <sys/diskmbr.h> 2522514Sdarrenr#include <sys/dirent.h> 2622514Sdarrenr#include <machine/bootinfo.h> 2722514Sdarrenr#include <machine/elf.h> 2822514Sdarrenr 2922514Sdarrenr#include <stdarg.h> 3022514Sdarrenr 3122514Sdarrenr#include <a.out.h> 3222514Sdarrenr 3322514Sdarrenr#include <btxv86.h> 3422514Sdarrenr 3522514Sdarrenr#include "boot2.h" 3622514Sdarrenr#include "lib.h" 3722514Sdarrenr 3822514Sdarrenr#define IO_KEYBOARD 1 3922514Sdarrenr#define IO_SERIAL 2 4022514Sdarrenr 4122514Sdarrenr#define SECOND 18 /* Circa that many ticks in a second. */ 4222514Sdarrenr 4322514Sdarrenr#define RBX_ASKNAME 0x0 /* -a */ 4422514Sdarrenr#define RBX_SINGLE 0x1 /* -s */ 4522514Sdarrenr#define RBX_DFLTROOT 0x5 /* -r */ 4622514Sdarrenr#define RBX_KDB 0x6 /* -d */ 4722514Sdarrenr#define RBX_CONFIG 0xa /* -c */ 4822514Sdarrenr#define RBX_VERBOSE 0xb /* -v */ 4922514Sdarrenr#define RBX_SERIAL 0xc /* -h */ 5022514Sdarrenr#define RBX_CDROM 0xd /* -C */ 5122514Sdarrenr#define RBX_GDB 0xf /* -g */ 5222514Sdarrenr#define RBX_MUTE 0x10 /* -m */ 5322514Sdarrenr#define RBX_PAUSE 0x12 /* -p */ 5422514Sdarrenr#define RBX_DUAL 0x1d /* -D */ 5522514Sdarrenr#define RBX_PROBEKBD 0x1e /* -P */ 5622514Sdarrenr#define RBX_NOINTR 0x1f /* -n */ 5722514Sdarrenr 5822514Sdarrenr#define RBX_MASK 0x2005ffff 5922514Sdarrenr 6022514Sdarrenr#define PATH_CONFIG "/boot.config" 6122514Sdarrenr#define PATH_BOOT3 "/boot/loader" 6222514Sdarrenr#define PATH_KERNEL "/kernel" 6322514Sdarrenr 6422514Sdarrenr#define ARGS 0x900 6522514Sdarrenr#define NOPT 14 6622514Sdarrenr#define NDEV 5 6722514Sdarrenr#define MEM_BASE 0x12 6822514Sdarrenr#define MEM_EXT 0x15 6922514Sdarrenr#define V86_CY(x) ((x) & 1) 7022514Sdarrenr#define V86_ZR(x) ((x) & 0x40) 7122514Sdarrenr 7222514Sdarrenr#define DRV_HARD 0x80 7322514Sdarrenr#define DRV_MASK 0x7f 7422514Sdarrenr 7522514Sdarrenr#define TYPE_AD 0 7622514Sdarrenr#define TYPE_DA 2 7722514Sdarrenr#define TYPE_MAXHARD TYPE_DA 7822514Sdarrenr#define TYPE_FD 4 7922514Sdarrenr 8022514Sdarrenrextern uint32_t _end; 8122514Sdarrenr 8222514Sdarrenrstatic const char optstr[NOPT] = "DhaCcdgmnPprsv"; 8322514Sdarrenrstatic const unsigned char flags[NOPT] = { 8422514Sdarrenr RBX_DUAL, 8522514Sdarrenr RBX_SERIAL, 8622514Sdarrenr RBX_ASKNAME, 8722514Sdarrenr RBX_CDROM, 8822514Sdarrenr RBX_CONFIG, 8922514Sdarrenr RBX_KDB, 9022514Sdarrenr RBX_GDB, 9122514Sdarrenr RBX_MUTE, 9222514Sdarrenr RBX_NOINTR, 9322514Sdarrenr RBX_PROBEKBD, 9422514Sdarrenr RBX_PAUSE, 9522514Sdarrenr RBX_DFLTROOT, 9622514Sdarrenr RBX_SINGLE, 9722514Sdarrenr RBX_VERBOSE 9822514Sdarrenr}; 9922514Sdarrenr 10022514Sdarrenrstatic const char *const dev_nm[NDEV] = {"ad", "wd", "da", " ", "fd"}; 10122514Sdarrenrstatic const unsigned char dev_maj[NDEV] = {30, 0, 4, 1, 2}; 10222514Sdarrenr 10322514Sdarrenrstatic struct dsk { 10422514Sdarrenr unsigned drive; 10522514Sdarrenr unsigned type; 10622514Sdarrenr unsigned unit; 10722514Sdarrenr unsigned slice; 10822514Sdarrenr unsigned part; 10922514Sdarrenr unsigned start; 11022514Sdarrenr int init; 11122514Sdarrenr} 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#define memcpy __builtin_memcpy 133 134static inline int 135strcmp(const char *s1, const char *s2) 136{ 137 for (; *s1 == *s2 && *s1; s1++, s2++); 138 return *s1 - *s2; 139} 140 141#include "ufsread.c" 142 143static int 144xfsread(ino_t inode, void *buf, size_t nbyte) 145{ 146 if ((size_t)fsread(inode, buf, nbyte) != nbyte) { 147 printf("Invalid %s\n", "format"); 148 return -1; 149 } 150 return 0; 151} 152 153static inline void 154getstr(char *str, int size) 155{ 156 char *s; 157 int c; 158 159 s = str; 160 for (;;) { 161 switch (c = xgetc(0)) { 162 case 0: 163 break; 164 case '\177': 165 c = '\b'; 166 case '\b': 167 if (s > str) { 168 s--; 169 putchar('\b'); 170 putchar(' '); 171 } else 172 c = 0; 173 break; 174 case '\n': 175 case '\r': 176 *s = 0; 177 return; 178 default: 179 if (s - str < size - 1) 180 *s++ = c; 181 } 182 if (c) 183 putchar(c); 184 } 185} 186 187static inline void 188putc(int c) 189{ 190 v86.addr = 0x10; 191 v86.eax = 0xe00 | (c & 0xff); 192 v86.ebx = 0x7; 193 v86int(); 194} 195 196int 197main(void) 198{ 199 int autoboot; 200 ino_t ino; 201 202 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); 203 v86.ctl = V86_FLAGS; 204 dsk.drive = *(uint8_t *)PTOV(ARGS); 205 dsk.type = dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD; 206 dsk.unit = dsk.drive & DRV_MASK; 207 dsk.slice = *(uint8_t *)PTOV(ARGS + 1) + 1; 208 bootinfo.bi_version = BOOTINFO_VERSION; 209 bootinfo.bi_size = sizeof(bootinfo); 210 bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */ 211 bootinfo.bi_extmem = memsize(MEM_EXT); 212 bootinfo.bi_memsizes_valid++; 213 214 /* Process configuration file */ 215 216 autoboot = 1; 217 218 if ((ino = lookup(PATH_CONFIG))) 219 fsread(ino, cmd, sizeof(cmd)); 220 221 if (*cmd) { 222 printf("%s: %s", PATH_CONFIG, cmd); 223 if (parse(cmd)) 224 autoboot = 0; 225 /* Do not process this command twice */ 226 *cmd = 0; 227 } 228 229 /* 230 * Try to exec stage 3 boot loader. If interrupted by a keypress, 231 * or in case of failure, try to load a kernel directly instead. 232 */ 233 234 if (autoboot && !*kname) { 235 memcpy(kname, PATH_BOOT3, sizeof(PATH_BOOT3)); 236 if (!keyhit(3*SECOND)) { 237 load(kname); 238 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); 239 } 240 } 241 242 /* Present the user with the boot2 prompt. */ 243 244 for (;;) { 245#ifdef UFS1_ONLY 246 printf(" \n>> FreeBSD/i386/UFS1 BOOT\n" 247#else 248 printf(" \n>> FreeBSD/i386/UFS[12] BOOT\n" 249#endif 250 "Default: %u:%s(%u,%c)%s\n" 251 "boot: ", 252 dsk.drive & DRV_MASK, dev_nm[dsk.type], dsk.unit, 253 'a' + dsk.part, kname); 254 if (ioctrl & IO_SERIAL) 255 sio_flush(); 256 if (!autoboot || keyhit(5*SECOND)) 257 getstr(cmd, sizeof(cmd)); 258 else 259 putchar('\n'); 260 autoboot = 0; 261 if (parse(cmd)) 262 putchar('\a'); 263 else 264 load(kname); 265 } 266} 267 268/* XXX - Needed for btxld to link the boot2 binary; do not remove. */ 269void 270exit(int x) 271{ 272} 273 274static void 275load(const char *fname) 276{ 277 union { 278 struct exec ex; 279 Elf32_Ehdr eh; 280 } hdr; 281 Elf32_Phdr ep[2]; 282 Elf32_Shdr es[2]; 283 caddr_t p; 284 ino_t ino; 285 uint32_t addr, x; 286 int fmt, i, j; 287 288 if (!(ino = lookup(fname))) { 289 if (!ls) 290 printf("No %s\n", fname); 291 return; 292 } 293 if (xfsread(ino, &hdr, sizeof(hdr))) 294 return; 295 if (N_GETMAGIC(hdr.ex) == ZMAGIC) 296 fmt = 0; 297 else if (IS_ELF(hdr.eh)) 298 fmt = 1; 299 else { 300 printf("Invalid %s\n", "format"); 301 return; 302 } 303 if (fmt == 0) { 304 addr = hdr.ex.a_entry & 0xffffff; 305 p = PTOV(addr); 306 fs_off = PAGE_SIZE; 307 if (xfsread(ino, p, hdr.ex.a_text)) 308 return; 309 p += roundup2(hdr.ex.a_text, PAGE_SIZE); 310 if (xfsread(ino, p, hdr.ex.a_data)) 311 return; 312 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE); 313 bootinfo.bi_symtab = VTOP(p); 314 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms)); 315 p += sizeof(hdr.ex.a_syms); 316 if (hdr.ex.a_syms) { 317 if (xfsread(ino, p, hdr.ex.a_syms)) 318 return; 319 p += hdr.ex.a_syms; 320 if (xfsread(ino, p, sizeof(int))) 321 return; 322 x = *(uint32_t *)p; 323 p += sizeof(int); 324 x -= sizeof(int); 325 if (xfsread(ino, p, x)) 326 return; 327 p += x; 328 } 329 } else { 330 fs_off = hdr.eh.e_phoff; 331 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { 332 if (xfsread(ino, ep + j, sizeof(ep[0]))) 333 return; 334 if (ep[j].p_type == PT_LOAD) 335 j++; 336 } 337 for (i = 0; i < 2; i++) { 338 p = PTOV(ep[i].p_paddr & 0xffffff); 339 fs_off = ep[i].p_offset; 340 if (xfsread(ino, p, ep[i].p_filesz)) 341 return; 342 } 343 p += roundup2(ep[1].p_memsz, PAGE_SIZE); 344 bootinfo.bi_symtab = VTOP(p); 345 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { 346 fs_off = hdr.eh.e_shoff + sizeof(es[0]) * 347 (hdr.eh.e_shstrndx + 1); 348 if (xfsread(ino, &es, sizeof(es))) 349 return; 350 for (i = 0; i < 2; i++) { 351 memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size)); 352 p += sizeof(es[i].sh_size); 353 fs_off = es[i].sh_offset; 354 if (xfsread(ino, p, es[i].sh_size)) 355 return; 356 p += es[i].sh_size; 357 } 358 } 359 addr = hdr.eh.e_entry & 0xffffff; 360 } 361 bootinfo.bi_esymtab = VTOP(p); 362 bootinfo.bi_kernelname = VTOP(fname); 363 bootinfo.bi_bios_dev = dsk.drive; 364 __exec((caddr_t)addr, opts & RBX_MASK, 365 MAKEBOOTDEV(dev_maj[dsk.type], 0, dsk.slice, dsk.unit, dsk.part), 366 0, 0, 0, VTOP(&bootinfo)); 367} 368 369static int 370parse(char *arg) 371{ 372 char *p, *q; 373 int drv, c, i; 374 375 while ((c = *arg++)) { 376 if (c == ' ' || c == '\t' || c == '\n') 377 continue; 378 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++); 379 if (*p) 380 *p++ = 0; 381 if (c == '-') { 382 while ((c = *arg++)) { 383 for (i = 0; c != optstr[i]; i++) 384 if (i == NOPT - 1) 385 return -1; 386 opts ^= 1 << flags[i]; 387 } 388 if (opts & 1 << RBX_PROBEKBD) { 389 i = *(uint8_t *)PTOV(0x496) & 0x10; 390 /* printf("Keyboard: %s\n", i ? "yes" : "no"); */ 391 if (!i) 392 opts |= 1 << RBX_DUAL | 1 << RBX_SERIAL; 393 opts &= ~(1 << RBX_PROBEKBD); 394 } 395 ioctrl = opts & 1 << RBX_DUAL ? (IO_SERIAL|IO_KEYBOARD) : 396 opts & 1 << RBX_SERIAL ? IO_SERIAL : IO_KEYBOARD; 397 if (ioctrl & IO_SERIAL) 398 sio_init(); 399 } else { 400 for (q = arg--; *q && *q != '('; q++); 401 if (*q) { 402 drv = -1; 403 if (arg[1] == ':') { 404 if (*arg < '0' || *arg > '9') 405 return -1; 406 drv = *arg - '0'; 407 arg += 2; 408 } 409 if (q - arg != 2) 410 return -1; 411 for (i = 0; arg[0] != dev_nm[i][0] || 412 arg[1] != dev_nm[i][1]; i++) 413 if (i == NDEV - 1) 414 return -1; 415 dsk.type = i; 416 arg += 3; 417 if (arg[1] != ',' || *arg < '0' || *arg > '9') 418 return -1; 419 dsk.unit = *arg - '0'; 420 arg += 2; 421 dsk.slice = WHOLE_DISK_SLICE; 422 if (arg[1] == ',') { 423 if (*arg < '0' || *arg > '0' + NDOSPART) 424 return -1; 425 if ((dsk.slice = *arg - '0')) 426 dsk.slice++; 427 arg += 2; 428 } 429 if (arg[1] != ')' || *arg < 'a' || *arg > 'p') 430 return -1; 431 dsk.part = *arg - 'a'; 432 arg += 2; 433 if (drv == -1) 434 drv = dsk.unit; 435 dsk.drive = (dsk.type <= TYPE_MAXHARD 436 ? DRV_HARD : 0) + drv; 437 dsk_meta = 0; 438 } 439 if ((i = p - arg - !*(p - 1))) { 440 if ((size_t)i >= sizeof(kname)) 441 return -1; 442 memcpy(kname, arg, i + 1); 443 } 444 } 445 arg = p; 446 } 447 return 0; 448} 449 450static int 451dskread(void *buf, unsigned lba, unsigned nblk) 452{ 453 struct dos_partition *dp; 454 struct disklabel *d; 455 char *sec; 456 unsigned sl, i; 457 458 if (!dsk_meta) { 459 sec = dmadat->secbuf; 460 dsk.start = 0; 461 if (drvread(sec, DOSBBSECTOR, 1)) 462 return -1; 463 dp = (void *)(sec + DOSPARTOFF); 464 sl = dsk.slice; 465 if (sl < BASE_SLICE) { 466 for (i = 0; i < NDOSPART; i++) 467 if (dp[i].dp_typ == DOSPTYP_386BSD && 468 (dp[i].dp_flag & 0x80 || sl < BASE_SLICE)) { 469 sl = BASE_SLICE + i; 470 if (dp[i].dp_flag & 0x80 || 471 dsk.slice == COMPATIBILITY_SLICE) 472 break; 473 } 474 if (dsk.slice == WHOLE_DISK_SLICE) 475 dsk.slice = sl; 476 } 477 if (sl != WHOLE_DISK_SLICE) { 478 if (sl != COMPATIBILITY_SLICE) 479 dp += sl - BASE_SLICE; 480 if (dp->dp_typ != DOSPTYP_386BSD) { 481 printf("Invalid %s\n", "slice"); 482 return -1; 483 } 484 dsk.start = dp->dp_start; 485 } 486 if (drvread(sec, dsk.start + LABELSECTOR, 1)) 487 return -1; 488 d = (void *)(sec + LABELOFFSET); 489 if (d->d_magic != DISKMAGIC || d->d_magic2 != DISKMAGIC) { 490 if (dsk.part != RAW_PART) { 491 printf("Invalid %s\n", "label"); 492 return -1; 493 } 494 } else { 495 if (!dsk.init) { 496 if (d->d_type == DTYPE_SCSI) 497 dsk.type = TYPE_DA; 498 dsk.init++; 499 } 500 if (dsk.part >= d->d_npartitions || 501 !d->d_partitions[dsk.part].p_size) { 502 printf("Invalid %s\n", "partition"); 503 return -1; 504 } 505 dsk.start += d->d_partitions[dsk.part].p_offset; 506 dsk.start -= d->d_partitions[RAW_PART].p_offset; 507 } 508 } 509 return drvread(buf, dsk.start + lba, nblk); 510} 511 512static void 513printf(const char *fmt,...) 514{ 515 static const char digits[16] = "0123456789abcdef"; 516 va_list ap; 517 char buf[10]; 518 char *s; 519 unsigned r, u; 520 int c; 521 522 va_start(ap, fmt); 523 while ((c = *fmt++)) { 524 if (c == '%') { 525 c = *fmt++; 526 switch (c) { 527 case 'c': 528 putchar(va_arg(ap, int)); 529 continue; 530 case 's': 531 for (s = va_arg(ap, char *); *s; s++) 532 putchar(*s); 533 continue; 534 case 'u': 535 case 'x': 536 r = c == 'u' ? 10U : 16U; 537 u = va_arg(ap, unsigned); 538 s = buf; 539 do 540 *s++ = digits[u % r]; 541 while (u /= r); 542 while (--s >= buf) 543 putchar(*s); 544 continue; 545 } 546 } 547 putchar(c); 548 } 549 va_end(ap); 550 return; 551} 552 553static void 554putchar(int c) 555{ 556 if (c == '\n') 557 xputc('\r'); 558 xputc(c); 559} 560 561static uint32_t 562memsize(int type) 563{ 564 v86.addr = type; 565 v86.eax = 0x8800; 566 v86int(); 567 return v86.eax; 568} 569 570static int 571drvread(void *buf, unsigned lba, unsigned nblk) 572{ 573 static unsigned c = 0x2d5c7c2f; 574 575 printf("%c\b", c = c << 8 | c >> 24); 576 v86.ctl = V86_ADDR | V86_CALLF | V86_FLAGS; 577 v86.addr = XREADORG; /* call to xread in boot1 */ 578 v86.es = VTOPSEG(buf); 579 v86.eax = lba; 580 v86.ebx = VTOPOFF(buf); 581 v86.ecx = lba >> 16; 582 v86.edx = nblk << 8 | dsk.drive; 583 v86int(); 584 v86.ctl = V86_FLAGS; 585 if (V86_CY(v86.efl)) { 586 printf("Disk error 0x%x lba 0x%x\n", v86.eax >> 8 & 0xff, lba); 587 return -1; 588 } 589 return 0; 590} 591 592static int 593keyhit(unsigned ticks) 594{ 595 uint32_t t0, t1; 596 597 if (opts & 1 << RBX_NOINTR) 598 return 0; 599 t0 = 0; 600 for (;;) { 601 if (xgetc(1)) 602 return 1; 603 t1 = *(uint32_t *)PTOV(0x46c); 604 if (!t0) 605 t0 = t1; 606 if (t1 < t0 || t1 >= t0 + ticks) 607 return 0; 608 } 609} 610 611static int 612xputc(int c) 613{ 614 if (ioctrl & IO_KEYBOARD) 615 putc(c); 616 if (ioctrl & IO_SERIAL) 617 sio_putc(c); 618 return c; 619} 620 621static int 622xgetc(int fn) 623{ 624 if (opts & 1 << RBX_NOINTR) 625 return 0; 626 for (;;) { 627 if (ioctrl & IO_KEYBOARD && getc(1)) 628 return fn ? 1 : getc(0); 629 if (ioctrl & IO_SERIAL && sio_ischar()) 630 return fn ? 1 : sio_getc(); 631 if (fn) 632 return 0; 633 } 634} 635 636static int 637getc(int fn) 638{ 639 v86.addr = 0x16; 640 v86.eax = fn << 8; 641 v86int(); 642 return fn == 0 ? v86.eax & 0xff : !V86_ZR(v86.efl); 643} 644