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 #include <sys/cdefs.h> 17 __FBSDID("$FreeBSD$"); 18 19 #include <sys/param.h> 20 #include <sys/gpt.h> 21 #include <sys/dirent.h> 22 #include <sys/reboot.h> 23 24 #include <machine/bootinfo.h> 25 #include <machine/elf.h> 26 #include <machine/pc/bios.h> 27 #include <machine/psl.h> 28 29 #include <stdarg.h> 30 31 #include <a.out.h> 32 33 #include <btxv86.h> 34 35 #include "stand.h" 36 37 #include "bootargs.h" 38 #include "lib.h" 39 #include "rbx.h" 40 #include "drv.h" 41 #include "cons.h" 42 #include "gpt.h" 43 #include "paths.h" 44 45 #define ARGS 0x900 46 #define NOPT 14 47 #define NDEV 3 48 #define MEM_BASE 0x12 49 #define MEM_EXT 0x15 50 51 #define DRV_HARD 0x80 52 #define DRV_MASK 0x7f 53 54 #define TYPE_AD 0 55 #define TYPE_DA 1 56 #define TYPE_MAXHARD TYPE_DA 57 #define TYPE_FD 2 58 59 extern uint32_t _end; 60 61 static const uuid_t freebsd_ufs_uuid = GPT_ENT_TYPE_FREEBSD_UFS; 62 static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */ 63 static const unsigned char flags[NOPT] = { 64 RBX_DUAL, 65 RBX_SERIAL, 66 RBX_ASKNAME, 67 RBX_CDROM, 68 RBX_CONFIG, 69 RBX_KDB, 70 RBX_GDB, 71 RBX_MUTE, 72 RBX_NOINTR, 73 RBX_PAUSE, 74 RBX_QUIET, 75 RBX_DFLTROOT, 76 RBX_SINGLE, 77 RBX_VERBOSE 78 }; 79 uint32_t opts; 80 81 static const char *const dev_nm[NDEV] = {"ad", "da", "fd"}; 82 static const unsigned char dev_maj[NDEV] = {30, 4, 2}; 83 84 static char kname[1024]; 85 static int comspeed = SIOSPD; 86 static struct bootinfo bootinfo; 87 #ifdef LOADER_GELI_SUPPORT 88 static struct geli_boot_args geliargs; 89 #endif 90 91 static vm_offset_t high_heap_base; 92 static uint32_t bios_basemem, bios_extmem, high_heap_size; 93 94 static struct bios_smap smap; 95 96 /* 97 * The minimum amount of memory to reserve in bios_extmem for the heap. 98 */ 99 #define HEAP_MIN (3 * 1024 * 1024) 100 101 static char *heap_next; 102 static char *heap_end; 103 104 static void load(void); 105 static int parse_cmds(char *, int *); 106 static int dskread(void *, daddr_t, unsigned); 107 #ifdef LOADER_GELI_SUPPORT 108 static int vdev_read(void *vdev __unused, void *priv, off_t off, void *buf, 109 size_t bytes); 110 #endif 111 112 #include "ufsread.c" 113 #include "gpt.c" 114 #ifdef LOADER_GELI_SUPPORT 115 #include "geliboot.h" 116 static char gelipw[GELI_PW_MAXLEN]; 117 #endif 118 119 struct gptdsk { 120 struct dsk dsk; 121 #ifdef LOADER_GELI_SUPPORT 122 struct geli_dev *gdev; 123 #endif 124 }; 125 126 static struct gptdsk gdsk; 127 128 static inline int 129 xfsread(ufs_ino_t inode, void *buf, size_t nbyte) 130 { 131 132 if ((size_t)fsread(inode, buf, nbyte) != nbyte) { 133 printf("Invalid %s\n", "format"); 134 return (-1); 135 } 136 return (0); 137 } 138 139 static void 140 bios_getmem(void) 141 { 142 uint64_t size; 143 144 /* Parse system memory map */ 145 v86.ebx = 0; 146 do { 147 v86.ctl = V86_FLAGS; 148 v86.addr = MEM_EXT; /* int 0x15 function 0xe820*/ 149 v86.eax = 0xe820; 150 v86.ecx = sizeof(struct bios_smap); 151 v86.edx = SMAP_SIG; 152 v86.es = VTOPSEG(&smap); 153 v86.edi = VTOPOFF(&smap); 154 v86int(); 155 if ((v86.efl & 1) || (v86.eax != SMAP_SIG)) 156 break; 157 /* look for a low-memory segment that's large enough */ 158 if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) && 159 (smap.length >= (512 * 1024))) 160 bios_basemem = smap.length; 161 /* look for the first segment in 'extended' memory */ 162 if ((smap.type == SMAP_TYPE_MEMORY) && 163 (smap.base == 0x100000)) { 164 bios_extmem = smap.length; 165 } 166 167 /* 168 * Look for the largest segment in 'extended' memory beyond 169 * 1MB but below 4GB. 170 */ 171 if ((smap.type == SMAP_TYPE_MEMORY) && 172 (smap.base > 0x100000) && (smap.base < 0x100000000ull)) { 173 size = smap.length; 174 175 /* 176 * If this segment crosses the 4GB boundary, 177 * truncate it. 178 */ 179 if (smap.base + size > 0x100000000ull) 180 size = 0x100000000ull - smap.base; 181 182 if (size > high_heap_size) { 183 high_heap_size = size; 184 high_heap_base = smap.base; 185 } 186 } 187 } while (v86.ebx != 0); 188 189 /* Fall back to the old compatibility function for base memory */ 190 if (bios_basemem == 0) { 191 v86.ctl = 0; 192 v86.addr = 0x12; /* int 0x12 */ 193 v86int(); 194 195 bios_basemem = (v86.eax & 0xffff) * 1024; 196 } 197 198 /* 199 * Fall back through several compatibility functions for extended 200 * memory 201 */ 202 if (bios_extmem == 0) { 203 v86.ctl = V86_FLAGS; 204 v86.addr = 0x15; /* int 0x15 function 0xe801*/ 205 v86.eax = 0xe801; 206 v86int(); 207 if (!(v86.efl & 1)) { 208 bios_extmem = ((v86.ecx & 0xffff) + 209 ((v86.edx & 0xffff) * 64)) * 1024; 210 } 211 } 212 if (bios_extmem == 0) { 213 v86.ctl = 0; 214 v86.addr = 0x15; /* int 0x15 function 0x88*/ 215 v86.eax = 0x8800; 216 v86int(); 217 bios_extmem = (v86.eax & 0xffff) * 1024; 218 } 219 220 /* 221 * If we have extended memory and did not find a suitable heap 222 * region in the SMAP, use the last 3MB of 'extended' memory as a 223 * high heap candidate. 224 */ 225 if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) { 226 high_heap_size = HEAP_MIN; 227 high_heap_base = bios_extmem + 0x100000 - HEAP_MIN; 228 } 229 } 230 231 static int 232 gptinit(void) 233 { 234 235 if (gptread(&gdsk.dsk, dmadat->secbuf) == -1) { 236 printf("%s: unable to load GPT\n", BOOTPROG); 237 return (-1); 238 } 239 if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, gdsk.dsk.part) == -1) { 240 printf("%s: no UFS partition was found\n", BOOTPROG); 241 return (-1); 242 } 243 #ifdef LOADER_GELI_SUPPORT 244 gdsk.gdev = geli_taste(vdev_read, &gdsk.dsk, 245 (gpttable[curent].ent_lba_end - gpttable[curent].ent_lba_start), 246 "disk%up%u:", gdsk.dsk.unit, curent + 1); 247 if (gdsk.gdev != NULL) { 248 if (geli_havekey(gdsk.gdev) != 0 && 249 geli_passphrase(gdsk.gdev, gelipw) != 0) { 250 printf("%s: unable to decrypt GELI key\n", BOOTPROG); 251 return (-1); 252 } 253 } 254 #endif 255 256 dsk_meta = 0; 257 return (0); 258 } 259 260 int main(void); 261 262 int 263 main(void) 264 { 265 char cmd[512], cmdtmp[512]; 266 ssize_t sz; 267 int autoboot, dskupdated; 268 ufs_ino_t ino; 269 270 dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); 271 272 bios_getmem(); 273 274 if (high_heap_size > 0) { 275 heap_end = PTOV(high_heap_base + high_heap_size); 276 heap_next = PTOV(high_heap_base); 277 } else { 278 heap_next = (char *)dmadat + sizeof(*dmadat); 279 heap_end = (char *)PTOV(bios_basemem); 280 } 281 setheap(heap_next, heap_end); 282 283 v86.ctl = V86_FLAGS; 284 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 285 gdsk.dsk.drive = *(uint8_t *)PTOV(ARGS); 286 gdsk.dsk.type = gdsk.dsk.drive & DRV_HARD ? TYPE_AD : TYPE_FD; 287 gdsk.dsk.unit = gdsk.dsk.drive & DRV_MASK; 288 gdsk.dsk.part = -1; 289 gdsk.dsk.start = 0; 290 bootinfo.bi_version = BOOTINFO_VERSION; 291 bootinfo.bi_size = sizeof(bootinfo); 292 bootinfo.bi_basemem = bios_basemem / 1024; 293 bootinfo.bi_extmem = bios_extmem / 1024; 294 bootinfo.bi_memsizes_valid++; 295 bootinfo.bi_bios_dev = gdsk.dsk.drive; 296 297 /* Process configuration file */ 298 299 if (gptinit() != 0) 300 return (-1); 301 302 autoboot = 1; 303 *cmd = '\0'; 304 305 for (;;) { 306 *kname = '\0'; 307 if ((ino = lookup(PATH_CONFIG)) || 308 (ino = lookup(PATH_DOTCONFIG))) { 309 sz = fsread(ino, cmd, sizeof(cmd) - 1); 310 cmd[(sz < 0) ? 0 : sz] = '\0'; 311 } 312 if (*cmd != '\0') { 313 memcpy(cmdtmp, cmd, sizeof(cmdtmp)); 314 if (parse_cmds(cmdtmp, &dskupdated)) 315 break; 316 if (dskupdated && gptinit() != 0) 317 break; 318 if (!OPT_CHECK(RBX_QUIET)) 319 printf("%s: %s", PATH_CONFIG, cmd); 320 *cmd = '\0'; 321 } 322 323 if (autoboot && keyhit(3)) { 324 if (*kname == '\0') 325 memcpy(kname, PATH_LOADER, sizeof(PATH_LOADER)); 326 break; 327 } 328 autoboot = 0; 329 330 /* 331 * Try to exec stage 3 boot loader. If interrupted by a 332 * keypress, or in case of failure, try to load a kernel 333 * directly instead. 334 */ 335 if (*kname != '\0') 336 load(); 337 memcpy(kname, PATH_LOADER, sizeof(PATH_LOADER)); 338 load(); 339 memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); 340 load(); 341 gptbootfailed(&gdsk.dsk); 342 if (gptfind(&freebsd_ufs_uuid, &gdsk.dsk, -1) == -1) 343 break; 344 dsk_meta = 0; 345 } 346 347 /* Present the user with the boot2 prompt. */ 348 349 for (;;) { 350 if (!OPT_CHECK(RBX_QUIET)) { 351 printf("\nFreeBSD/x86 boot\n" 352 "Default: %u:%s(%up%u)%s\n" 353 "boot: ", 354 gdsk.dsk.drive & DRV_MASK, dev_nm[gdsk.dsk.type], 355 gdsk.dsk.unit, gdsk.dsk.part, kname); 356 } 357 if (ioctrl & IO_SERIAL) 358 sio_flush(); 359 *cmd = '\0'; 360 if (keyhit(0)) 361 getstr(cmd, sizeof(cmd)); 362 else if (!OPT_CHECK(RBX_QUIET)) 363 putchar('\n'); 364 if (parse_cmds(cmd, &dskupdated)) { 365 putchar('\a'); 366 continue; 367 } 368 if (dskupdated && gptinit() != 0) 369 continue; 370 load(); 371 } 372 /* NOTREACHED */ 373 } 374 375 /* XXX - Needed for btxld to link the boot2 binary; do not remove. */ 376 void 377 exit(int x) 378 { 379 380 while (1); 381 __unreachable(); 382 } 383 384 static void 385 load(void) 386 { 387 union { 388 struct exec ex; 389 Elf32_Ehdr eh; 390 } hdr; 391 static Elf32_Phdr ep[2]; 392 static Elf32_Shdr es[2]; 393 caddr_t p; 394 ufs_ino_t ino; 395 uint32_t addr, x; 396 int fmt, i, j; 397 398 if (!(ino = lookup(kname))) { 399 if (!ls) { 400 printf("%s: No %s on %u:%s(%up%u)\n", BOOTPROG, 401 kname, gdsk.dsk.drive & DRV_MASK, 402 dev_nm[gdsk.dsk.type], gdsk.dsk.unit, 403 gdsk.dsk.part); 404 } 405 return; 406 } 407 if (xfsread(ino, &hdr, sizeof(hdr))) 408 return; 409 if (N_GETMAGIC(hdr.ex) == ZMAGIC) 410 fmt = 0; 411 else if (IS_ELF(hdr.eh)) 412 fmt = 1; 413 else { 414 printf("Invalid %s\n", "format"); 415 return; 416 } 417 if (fmt == 0) { 418 addr = hdr.ex.a_entry & 0xffffff; 419 p = PTOV(addr); 420 fs_off = PAGE_SIZE; 421 if (xfsread(ino, p, hdr.ex.a_text)) 422 return; 423 p += roundup2(hdr.ex.a_text, PAGE_SIZE); 424 if (xfsread(ino, p, hdr.ex.a_data)) 425 return; 426 p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE); 427 bootinfo.bi_symtab = VTOP(p); 428 memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms)); 429 p += sizeof(hdr.ex.a_syms); 430 if (hdr.ex.a_syms) { 431 if (xfsread(ino, p, hdr.ex.a_syms)) 432 return; 433 p += hdr.ex.a_syms; 434 if (xfsread(ino, p, sizeof(int))) 435 return; 436 x = *(uint32_t *)p; 437 p += sizeof(int); 438 x -= sizeof(int); 439 if (xfsread(ino, p, x)) 440 return; 441 p += x; 442 } 443 } else { 444 fs_off = hdr.eh.e_phoff; 445 for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { 446 if (xfsread(ino, ep + j, sizeof(ep[0]))) 447 return; 448 if (ep[j].p_type == PT_LOAD) 449 j++; 450 } 451 for (i = 0; i < 2; i++) { 452 p = PTOV(ep[i].p_paddr & 0xffffff); 453 fs_off = ep[i].p_offset; 454 if (xfsread(ino, p, ep[i].p_filesz)) 455 return; 456 } 457 p += roundup2(ep[1].p_memsz, PAGE_SIZE); 458 bootinfo.bi_symtab = VTOP(p); 459 if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { 460 fs_off = hdr.eh.e_shoff + sizeof(es[0]) * 461 (hdr.eh.e_shstrndx + 1); 462 if (xfsread(ino, &es, sizeof(es))) 463 return; 464 for (i = 0; i < 2; i++) { 465 memcpy(p, &es[i].sh_size, 466 sizeof(es[i].sh_size)); 467 p += sizeof(es[i].sh_size); 468 fs_off = es[i].sh_offset; 469 if (xfsread(ino, p, es[i].sh_size)) 470 return; 471 p += es[i].sh_size; 472 } 473 } 474 addr = hdr.eh.e_entry & 0xffffff; 475 } 476 bootinfo.bi_esymtab = VTOP(p); 477 bootinfo.bi_kernelname = VTOP(kname); 478 bootinfo.bi_bios_dev = gdsk.dsk.drive; 479 #ifdef LOADER_GELI_SUPPORT 480 geliargs.size = sizeof(geliargs); 481 explicit_bzero(gelipw, sizeof(gelipw)); 482 export_geli_boot_data(&geliargs.gelidata); 483 #endif 484 /* 485 * Note that the geliargs struct is passed by value, not by pointer. 486 * Code in btxldr.S copies the values from the entry stack to a fixed 487 * location within loader(8) at startup due to the presence of the 488 * KARGS_FLAGS_EXTARG flag. 489 */ 490 __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK), 491 MAKEBOOTDEV(dev_maj[gdsk.dsk.type], gdsk.dsk.part + 1, gdsk.dsk.unit, 0xff), 492 #ifdef LOADER_GELI_SUPPORT 493 KARGS_FLAGS_GELI | KARGS_FLAGS_EXTARG, 0, 0, VTOP(&bootinfo), geliargs 494 #else 495 0, 0, 0, VTOP(&bootinfo) 496 #endif 497 ); 498 } 499 500 static int 501 parse_cmds(char *cmdstr, int *dskupdated) 502 { 503 char *arg; 504 char *ep, *p, *q; 505 const char *cp; 506 unsigned int drv; 507 int c, i, j; 508 509 arg = cmdstr; 510 *dskupdated = 0; 511 while ((c = *arg++)) { 512 if (c == ' ' || c == '\t' || c == '\n') 513 continue; 514 for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++); 515 ep = p; 516 if (*p) 517 *p++ = 0; 518 if (c == '-') { 519 while ((c = *arg++)) { 520 if (c == 'P') { 521 if (*(uint8_t *)PTOV(0x496) & 0x10) { 522 cp = "yes"; 523 } else { 524 opts |= OPT_SET(RBX_DUAL) | 525 OPT_SET(RBX_SERIAL); 526 cp = "no"; 527 } 528 printf("Keyboard: %s\n", cp); 529 continue; 530 } else if (c == 'S') { 531 j = 0; 532 while ((unsigned int)(i = *arg++ - '0') 533 <= 9) 534 j = j * 10 + i; 535 if (j > 0 && i == -'0') { 536 comspeed = j; 537 break; 538 } 539 /* 540 * Fall through to error below 541 * ('S' not in optstr[]). 542 */ 543 } 544 for (i = 0; c != optstr[i]; i++) 545 if (i == NOPT - 1) 546 return (-1); 547 opts ^= OPT_SET(flags[i]); 548 } 549 ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) : 550 OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD; 551 if (ioctrl & IO_SERIAL) { 552 if (sio_init(115200 / comspeed) != 0) 553 ioctrl &= ~IO_SERIAL; 554 } 555 } else { 556 for (q = arg--; *q && *q != '('; q++); 557 if (*q) { 558 drv = -1; 559 if (arg[1] == ':') { 560 drv = *arg - '0'; 561 if (drv > 9) 562 return (-1); 563 arg += 2; 564 } 565 if (q - arg != 2) 566 return (-1); 567 for (i = 0; arg[0] != dev_nm[i][0] || 568 arg[1] != dev_nm[i][1]; i++) 569 if (i == NDEV - 1) 570 return (-1); 571 gdsk.dsk.type = i; 572 arg += 3; 573 gdsk.dsk.unit = *arg - '0'; 574 if (arg[1] != 'p' || gdsk.dsk.unit > 9) 575 return (-1); 576 arg += 2; 577 j = 0; 578 while (*arg >= '0' && *arg <= '9') 579 j = j * 10 + *arg++ - '0'; 580 gdsk.dsk.part = j; 581 if (gdsk.dsk.part < 1 || gdsk.dsk.part > 128) 582 return (-1); 583 if (arg[0] != ')') 584 return (-1); 585 arg++; 586 if (drv == -1) 587 drv = gdsk.dsk.unit; 588 gdsk.dsk.drive = (gdsk.dsk.type <= TYPE_MAXHARD 589 ? DRV_HARD : 0) + drv; 590 *dskupdated = 1; 591 } 592 if ((i = ep - arg)) { 593 if ((size_t)i >= sizeof(kname)) 594 return (-1); 595 memcpy(kname, arg, i + 1); 596 } 597 } 598 arg = p; 599 } 600 return (0); 601 } 602 603 static int 604 dskread(void *buf, daddr_t lba, unsigned nblk) 605 { 606 int err; 607 608 err = drvread(&gdsk.dsk, buf, lba + gdsk.dsk.start, nblk); 609 610 #ifdef LOADER_GELI_SUPPORT 611 if (err == 0 && gdsk.gdev != NULL) { 612 /* Decrypt */ 613 if (geli_io(gdsk.gdev, GELI_DECRYPT, lba * DEV_BSIZE, buf, 614 nblk * DEV_BSIZE)) 615 return (err); 616 } 617 #endif 618 619 return (err); 620 } 621 622 #ifdef LOADER_GELI_SUPPORT 623 /* 624 * Read function compatible with the ZFS callback, required to keep the GELI 625 * implementation the same for both UFS and ZFS. 626 */ 627 static int 628 vdev_read(void *vdev __unused, void *priv, off_t off, void *buf, size_t bytes) 629 { 630 char *p; 631 daddr_t lba; 632 unsigned int nb; 633 struct gptdsk *dskp; 634 635 dskp = (struct gptdsk *)priv; 636 637 if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1))) 638 return (-1); 639 640 p = buf; 641 lba = off / DEV_BSIZE; 642 lba += dskp->dsk.start; 643 644 while (bytes > 0) { 645 nb = bytes / DEV_BSIZE; 646 if (nb > VBLKSIZE / DEV_BSIZE) 647 nb = VBLKSIZE / DEV_BSIZE; 648 if (drvread(&dskp->dsk, dmadat->blkbuf, lba, nb)) 649 return (-1); 650 memcpy(p, dmadat->blkbuf, nb * DEV_BSIZE); 651 p += nb * DEV_BSIZE; 652 lba += nb; 653 bytes -= nb * DEV_BSIZE; 654 } 655 656 return (0); 657 } 658 #endif /* LOADER_GELI_SUPPORT */ 659