1/*- 2 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <stand.h> 31#include <sys/param.h> 32#include <sys/diskmbr.h> 33#include <sys/disklabel.h> 34#include <sys/endian.h> 35#include <sys/gpt.h> 36#include <sys/stddef.h> 37#include <sys/queue.h> 38#include <sys/vtoc.h> 39 40#include <crc32.h> 41#include <part.h> 42#include <uuid.h> 43 44#ifdef PART_DEBUG 45#define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) 46#else 47#define DEBUG(fmt, args...) 48#endif 49 50#ifdef LOADER_GPT_SUPPORT 51#define MAXTBLSZ 64 52static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED; 53static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; 54static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; 55static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI; 56static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; 57static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS; 58static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; 59static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; 60static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM; 61#endif 62 63struct pentry { 64 struct ptable_entry part; 65 uint64_t flags; 66 union { 67 uint8_t bsd; 68 uint8_t mbr; 69 uuid_t gpt; 70 uint16_t vtoc8; 71 } type; 72 STAILQ_ENTRY(pentry) entry; 73}; 74 75struct ptable { 76 enum ptable_type type; 77 uint16_t sectorsize; 78 uint64_t sectors; 79 80 STAILQ_HEAD(, pentry) entries; 81}; 82 83static struct parttypes { 84 enum partition_type type; 85 const char *desc; 86} ptypes[] = { 87 { PART_UNKNOWN, "Unknown" }, 88 { PART_EFI, "EFI" }, 89 { PART_FREEBSD, "FreeBSD" }, 90 { PART_FREEBSD_BOOT, "FreeBSD boot" }, 91 { PART_FREEBSD_NANDFS, "FreeBSD nandfs" }, 92 { PART_FREEBSD_UFS, "FreeBSD UFS" }, 93 { PART_FREEBSD_ZFS, "FreeBSD ZFS" }, 94 { PART_FREEBSD_SWAP, "FreeBSD swap" }, 95 { PART_FREEBSD_VINUM, "FreeBSD vinum" }, 96 { PART_LINUX, "Linux" }, 97 { PART_LINUX_SWAP, "Linux swap" }, 98 { PART_DOS, "DOS/Windows" }, 99}; 100 101const char * 102parttype2str(enum partition_type type) 103{ 104 int i; 105 106 for (i = 0; i < sizeof(ptypes) / sizeof(ptypes[0]); i++) 107 if (ptypes[i].type == type) 108 return (ptypes[i].desc); 109 return (ptypes[0].desc); 110} 111 112#ifdef LOADER_GPT_SUPPORT 113static void 114uuid_letoh(uuid_t *uuid) 115{ 116 117 uuid->time_low = le32toh(uuid->time_low); 118 uuid->time_mid = le16toh(uuid->time_mid); 119 uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version); 120} 121 122static enum partition_type 123gpt_parttype(uuid_t type) 124{ 125 126 if (uuid_equal(&type, &gpt_uuid_efi, NULL)) 127 return (PART_EFI); 128 else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL)) 129 return (PART_DOS); 130 else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL)) 131 return (PART_FREEBSD_BOOT); 132 else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL)) 133 return (PART_FREEBSD_UFS); 134 else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL)) 135 return (PART_FREEBSD_ZFS); 136 else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL)) 137 return (PART_FREEBSD_SWAP); 138 else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL)) 139 return (PART_FREEBSD_VINUM); 140 else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL)) 141 return (PART_FREEBSD_NANDFS); 142 return (PART_UNKNOWN); 143} 144 145static struct gpt_hdr* 146gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last, 147 uint16_t sectorsize) 148{ 149 uint32_t sz, crc; 150 151 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) { 152 DEBUG("no GPT signature"); 153 return (NULL); 154 } 155 sz = le32toh(hdr->hdr_size); 156 if (sz < 92 || sz > sectorsize) { 157 DEBUG("invalid GPT header size: %d", sz); 158 return (NULL); 159 } 160 crc = le32toh(hdr->hdr_crc_self); 161 hdr->hdr_crc_self = 0; 162 if (crc32(hdr, sz) != crc) { 163 DEBUG("GPT header's CRC doesn't match"); 164 return (NULL); 165 } 166 hdr->hdr_crc_self = crc; 167 hdr->hdr_revision = le32toh(hdr->hdr_revision); 168 if (hdr->hdr_revision < GPT_HDR_REVISION) { 169 DEBUG("unsupported GPT revision %d", hdr->hdr_revision); 170 return (NULL); 171 } 172 hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self); 173 if (hdr->hdr_lba_self != lba_self) { 174 DEBUG("self LBA doesn't match"); 175 return (NULL); 176 } 177 hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt); 178 if (hdr->hdr_lba_alt == hdr->hdr_lba_self) { 179 DEBUG("invalid alternate LBA"); 180 return (NULL); 181 } 182 hdr->hdr_entries = le32toh(hdr->hdr_entries); 183 hdr->hdr_entsz = le32toh(hdr->hdr_entsz); 184 if (hdr->hdr_entries == 0 || 185 hdr->hdr_entsz < sizeof(struct gpt_ent) || 186 sectorsize % hdr->hdr_entsz != 0) { 187 DEBUG("invalid entry size or number of entries"); 188 return (NULL); 189 } 190 hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start); 191 hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end); 192 hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table); 193 hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table); 194 uuid_letoh(&hdr->hdr_uuid); 195 return (hdr); 196} 197 198static int 199gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size, 200 uint64_t lba_last) 201{ 202 struct gpt_ent *ent; 203 int i, cnt; 204 205 cnt = size / hdr->hdr_entsz; 206 if (hdr->hdr_entries <= cnt) { 207 cnt = hdr->hdr_entries; 208 /* Check CRC only when buffer size is enough for table. */ 209 if (hdr->hdr_crc_table != 210 crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz)) { 211 DEBUG("GPT table's CRC doesn't match"); 212 return (-1); 213 } 214 } 215 ent = (struct gpt_ent *)tbl; 216 for (i = 0; i < cnt; i++, ent++) { 217 uuid_letoh(&ent->ent_type); 218 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 219 continue; 220 ent->ent_lba_start = le64toh(ent->ent_lba_start); 221 ent->ent_lba_end = le64toh(ent->ent_lba_end); 222 } 223 return (0); 224} 225 226static struct ptable* 227ptable_gptread(struct ptable *table, void *dev, diskread_t dread) 228{ 229 struct pentry *entry; 230 struct gpt_hdr *phdr, hdr; 231 struct gpt_ent *ent; 232 u_char *buf, *tbl; 233 uint64_t offset; 234 int pri, sec, i; 235 size_t size; 236 237 buf = malloc(table->sectorsize); 238 if (buf == NULL) 239 return (NULL); 240 tbl = malloc(table->sectorsize * MAXTBLSZ); 241 if (tbl == NULL) { 242 free(buf); 243 return (NULL); 244 } 245 /* Read the primary GPT header. */ 246 if (dread(dev, buf, 1, 1) != 0) { 247 ptable_close(table); 248 table = NULL; 249 goto out; 250 } 251 pri = sec = 0; 252 /* Check the primary GPT header. */ 253 phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1, 254 table->sectorsize); 255 if (phdr != NULL) { 256 /* Read the primary GPT table. */ 257 size = MIN(MAXTBLSZ, 258 phdr->hdr_entries * phdr->hdr_entsz / table->sectorsize); 259 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 260 gpt_checktbl(phdr, tbl, size * table->sectorsize, 261 table->sectors - 1) == 0) { 262 memcpy(&hdr, phdr, sizeof(hdr)); 263 pri = 1; 264 } 265 } 266 offset = pri ? hdr.hdr_lba_alt: table->sectors - 1; 267 /* Read the backup GPT header. */ 268 if (dread(dev, buf, 1, offset) != 0) 269 phdr = NULL; 270 else 271 phdr = gpt_checkhdr((struct gpt_hdr *)buf, offset, 272 table->sectors - 1, table->sectorsize); 273 if (phdr != NULL) { 274 /* 275 * Compare primary and backup headers. 276 * If they are equal, then we do not need to read backup 277 * table. If they are different, then prefer backup header 278 * and try to read backup table. 279 */ 280 if (pri == 0 || 281 uuid_equal(&hdr.hdr_uuid, &phdr->hdr_uuid, NULL) == 0 || 282 hdr.hdr_revision != phdr->hdr_revision || 283 hdr.hdr_size != phdr->hdr_size || 284 hdr.hdr_lba_start != phdr->hdr_lba_start || 285 hdr.hdr_lba_end != phdr->hdr_lba_end || 286 hdr.hdr_entries != phdr->hdr_entries || 287 hdr.hdr_entsz != phdr->hdr_entsz || 288 hdr.hdr_crc_table != phdr->hdr_crc_table) { 289 /* Read the backup GPT table. */ 290 size = MIN(MAXTBLSZ, phdr->hdr_entries * 291 phdr->hdr_entsz / table->sectorsize); 292 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && 293 gpt_checktbl(phdr, tbl, size * table->sectorsize, 294 table->sectors - 1) == 0) { 295 memcpy(&hdr, phdr, sizeof(hdr)); 296 sec = 1; 297 } 298 } 299 } 300 if (pri == 0 && sec == 0) { 301 /* Both primary and backup tables are invalid. */ 302 table->type = PTABLE_NONE; 303 goto out; 304 } 305 ent = (struct gpt_ent *)tbl; 306 size = MIN(hdr.hdr_entries * hdr.hdr_entsz, 307 MAXTBLSZ * table->sectorsize); 308 for (i = 0; i < size / hdr.hdr_entsz; i++, ent++) { 309 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) 310 continue; 311 entry = malloc(sizeof(*entry)); 312 if (entry == NULL) 313 break; 314 entry->part.start = ent->ent_lba_start; 315 entry->part.end = ent->ent_lba_end; 316 entry->part.index = i + 1; 317 entry->part.type = gpt_parttype(ent->ent_type); 318 entry->flags = le64toh(ent->ent_attr); 319 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t)); 320 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 321 DEBUG("new GPT partition added"); 322 } 323out: 324 free(buf); 325 free(tbl); 326 return (table); 327} 328#endif /* LOADER_GPT_SUPPORT */ 329 330#ifdef LOADER_MBR_SUPPORT 331/* We do not need to support too many EBR partitions in the loader */ 332#define MAXEBRENTRIES 8 333static enum partition_type 334mbr_parttype(uint8_t type) 335{ 336 337 switch (type) { 338 case DOSPTYP_386BSD: 339 return (PART_FREEBSD); 340 case DOSPTYP_LINSWP: 341 return (PART_LINUX_SWAP); 342 case DOSPTYP_LINUX: 343 return (PART_LINUX); 344 case 0x01: 345 case 0x04: 346 case 0x06: 347 case 0x07: 348 case 0x0b: 349 case 0x0c: 350 case 0x0e: 351 return (PART_DOS); 352 } 353 return (PART_UNKNOWN); 354} 355 356struct ptable* 357ptable_ebrread(struct ptable *table, void *dev, diskread_t dread) 358{ 359 struct dos_partition *dp; 360 struct pentry *e1, *entry; 361 uint32_t start, end, offset; 362 u_char *buf; 363 int i, index; 364 365 STAILQ_FOREACH(e1, &table->entries, entry) { 366 if (e1->type.mbr == DOSPTYP_EXT || 367 e1->type.mbr == DOSPTYP_EXTLBA) 368 break; 369 } 370 if (e1 == NULL) 371 return (table); 372 index = 5; 373 offset = e1->part.start; 374 buf = malloc(table->sectorsize); 375 if (buf == NULL) 376 return (table); 377 for (i = 0; i < MAXEBRENTRIES; i++) { 378#if 0 /* Some BIOSes return an incorrect number of sectors */ 379 if (offset >= table->sectors) 380 break; 381#endif 382 if (dread(dev, buf, 1, offset) != 0) 383 break; 384 dp = (struct dos_partition *)(buf + DOSPARTOFF); 385 if (dp[0].dp_typ == 0) 386 break; 387 start = le32toh(dp[0].dp_start); 388 if (dp[0].dp_typ == DOSPTYP_EXT && 389 dp[1].dp_typ == 0) { 390 offset = e1->part.start + start; 391 continue; 392 } 393 end = le32toh(dp[0].dp_size); 394 entry = malloc(sizeof(*entry)); 395 if (entry == NULL) 396 break; 397 entry->part.start = offset + start; 398 entry->part.end = entry->part.start + end - 1; 399 entry->part.index = index++; 400 entry->part.type = mbr_parttype(dp[0].dp_typ); 401 entry->flags = dp[0].dp_flag; 402 entry->type.mbr = dp[0].dp_typ; 403 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 404 DEBUG("new EBR partition added"); 405 if (dp[1].dp_typ == 0) 406 break; 407 offset = e1->part.start + le32toh(dp[1].dp_start); 408 } 409 free(buf); 410 return (table); 411} 412#endif /* LOADER_MBR_SUPPORT */ 413 414static enum partition_type 415bsd_parttype(uint8_t type) 416{ 417 418 switch (type) { 419 case FS_NANDFS: 420 return (PART_FREEBSD_NANDFS); 421 case FS_SWAP: 422 return (PART_FREEBSD_SWAP); 423 case FS_BSDFFS: 424 return (PART_FREEBSD_UFS); 425 case FS_VINUM: 426 return (PART_FREEBSD_VINUM); 427 case FS_ZFS: 428 return (PART_FREEBSD_ZFS); 429 } 430 return (PART_UNKNOWN); 431} 432 433struct ptable* 434ptable_bsdread(struct ptable *table, void *dev, diskread_t dread) 435{ 436 struct disklabel *dl; 437 struct partition *part; 438 struct pentry *entry; 439 u_char *buf; 440 uint32_t raw_offset; 441 int i; 442 443 if (table->sectorsize < sizeof(struct disklabel)) { 444 DEBUG("Too small sectorsize"); 445 return (table); 446 } 447 buf = malloc(table->sectorsize); 448 if (buf == NULL) 449 return (table); 450 if (dread(dev, buf, 1, 1) != 0) { 451 DEBUG("read failed"); 452 ptable_close(table); 453 table = NULL; 454 goto out; 455 } 456 dl = (struct disklabel *)buf; 457 if (le32toh(dl->d_magic) != DISKMAGIC && 458 le32toh(dl->d_magic2) != DISKMAGIC) 459 goto out; 460 if (le32toh(dl->d_secsize) != table->sectorsize) { 461 DEBUG("unsupported sector size"); 462 goto out; 463 } 464 dl->d_npartitions = le16toh(dl->d_npartitions); 465 if (dl->d_npartitions > 20 || dl->d_npartitions < 8) { 466 DEBUG("invalid number of partitions"); 467 goto out; 468 } 469 part = &dl->d_partitions[0]; 470 raw_offset = le32toh(part[RAW_PART].p_offset); 471 for (i = 0; i < dl->d_npartitions; i++, part++) { 472 if (i == RAW_PART) 473 continue; 474 if (part->p_size == 0) 475 continue; 476 entry = malloc(sizeof(*entry)); 477 if (entry == NULL) 478 break; 479 entry->part.start = le32toh(part->p_offset) - raw_offset; 480 entry->part.end = entry->part.start + 481 le32toh(part->p_size) + 1; 482 entry->part.type = bsd_parttype(part->p_fstype); 483 entry->part.index = i; /* starts from zero */ 484 entry->type.bsd = part->p_fstype; 485 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 486 DEBUG("new BSD partition added"); 487 } 488 table->type = PTABLE_BSD; 489out: 490 free(buf); 491 return (table); 492} 493 494#ifdef LOADER_VTOC8_SUPPORT 495static enum partition_type 496vtoc8_parttype(uint16_t type) 497{ 498 499 switch (type) { 500 case VTOC_TAG_FREEBSD_NANDFS: 501 return (PART_FREEBSD_NANDFS); 502 case VTOC_TAG_FREEBSD_SWAP: 503 return (PART_FREEBSD_SWAP); 504 case VTOC_TAG_FREEBSD_UFS: 505 return (PART_FREEBSD_UFS); 506 case VTOC_TAG_FREEBSD_VINUM: 507 return (PART_FREEBSD_VINUM); 508 case VTOC_TAG_FREEBSD_ZFS: 509 return (PART_FREEBSD_ZFS); 510 }; 511 return (PART_UNKNOWN); 512} 513 514static struct ptable* 515ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread) 516{ 517 struct pentry *entry; 518 struct vtoc8 *dl; 519 u_char *buf; 520 uint16_t sum, heads, sectors; 521 int i; 522 523 if (table->sectorsize != sizeof(struct vtoc8)) 524 return (table); 525 buf = malloc(table->sectorsize); 526 if (buf == NULL) 527 return (table); 528 if (dread(dev, buf, 1, 0) != 0) { 529 DEBUG("read failed"); 530 ptable_close(table); 531 table = NULL; 532 goto out; 533 } 534 dl = (struct vtoc8 *)buf; 535 /* Check the sum */ 536 for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum)) 537 sum ^= be16dec(buf + i); 538 if (sum != 0) { 539 DEBUG("incorrect checksum"); 540 goto out; 541 } 542 if (be16toh(dl->nparts) != VTOC8_NPARTS) { 543 DEBUG("invalid number of entries"); 544 goto out; 545 } 546 sectors = be16toh(dl->nsecs); 547 heads = be16toh(dl->nheads); 548 if (sectors * heads == 0) { 549 DEBUG("invalid geometry"); 550 goto out; 551 } 552 for (i = 0; i < VTOC8_NPARTS; i++) { 553 dl->part[i].tag = be16toh(dl->part[i].tag); 554 if (i == VTOC_RAW_PART || 555 dl->part[i].tag == VTOC_TAG_UNASSIGNED) 556 continue; 557 entry = malloc(sizeof(*entry)); 558 if (entry == NULL) 559 break; 560 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors; 561 entry->part.end = be32toh(dl->map[i].nblks) + 562 entry->part.start - 1; 563 entry->part.type = vtoc8_parttype(dl->part[i].tag); 564 entry->part.index = i; /* starts from zero */ 565 entry->type.vtoc8 = dl->part[i].tag; 566 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 567 DEBUG("new VTOC8 partition added"); 568 } 569 table->type = PTABLE_VTOC8; 570out: 571 free(buf); 572 return (table); 573 574} 575#endif /* LOADER_VTOC8_SUPPORT */ 576 577struct ptable* 578ptable_open(void *dev, off_t sectors, uint16_t sectorsize, 579 diskread_t *dread) 580{ 581 struct dos_partition *dp; 582 struct ptable *table; 583 u_char *buf; 584 int i, count; 585#ifdef LOADER_MBR_SUPPORT 586 struct pentry *entry; 587 uint32_t start, end; 588 int has_ext; 589#endif 590 table = NULL; 591 buf = malloc(sectorsize); 592 if (buf == NULL) 593 return (NULL); 594 /* First, read the MBR. */ 595 if (dread(dev, buf, 1, DOSBBSECTOR) != 0) { 596 DEBUG("read failed"); 597 goto out; 598 } 599 600 table = malloc(sizeof(*table)); 601 if (table == NULL) 602 goto out; 603 table->sectors = sectors; 604 table->sectorsize = sectorsize; 605 table->type = PTABLE_NONE; 606 STAILQ_INIT(&table->entries); 607 608#ifdef LOADER_VTOC8_SUPPORT 609 if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) { 610 if (ptable_vtoc8read(table, dev, dread) == NULL) { 611 /* Read error. */ 612 table = NULL; 613 goto out; 614 } else if (table->type == PTABLE_VTOC8) 615 goto out; 616 } 617#endif 618 /* Check the BSD label. */ 619 if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */ 620 table = NULL; 621 goto out; 622 } else if (table->type == PTABLE_BSD) 623 goto out; 624 625#if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) 626 /* Check the MBR magic. */ 627 if (buf[DOSMAGICOFFSET] != 0x55 || 628 buf[DOSMAGICOFFSET + 1] != 0xaa) { 629 DEBUG("magic sequence not found"); 630 goto out; 631 } 632 /* Check that we have PMBR. Also do some validation. */ 633 dp = (struct dos_partition *)(buf + DOSPARTOFF); 634 for (i = 0, count = 0; i < NDOSPART; i++) { 635 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) { 636 DEBUG("invalid partition flag %x", dp[i].dp_flag); 637 goto out; 638 } 639#ifdef LOADER_GPT_SUPPORT 640 if (dp[i].dp_typ == DOSPTYP_PMBR) { 641 table->type = PTABLE_GPT; 642 DEBUG("PMBR detected"); 643 } 644#endif 645 if (dp[i].dp_typ != 0) 646 count++; 647 } 648 /* Do we have some invalid values? */ 649 if (table->type == PTABLE_GPT && count > 1) { 650 if (dp[1].dp_typ != DOSPTYP_HFS) { 651 table->type = PTABLE_NONE; 652 DEBUG("Incorrect PMBR, ignore it"); 653 } else 654 DEBUG("Bootcamp detected"); 655 } 656#ifdef LOADER_GPT_SUPPORT 657 if (table->type == PTABLE_GPT) { 658 table = ptable_gptread(table, dev, dread); 659 goto out; 660 } 661#endif 662#ifdef LOADER_MBR_SUPPORT 663 /* Read MBR. */ 664 table->type = PTABLE_MBR; 665 for (i = has_ext = 0; i < NDOSPART; i++) { 666 if (dp[i].dp_typ == 0) 667 continue; 668 start = le32dec(&(dp[i].dp_start)); 669 end = le32dec(&(dp[i].dp_size)); 670 if (start == 0 || end == 0) 671 continue; 672#if 0 /* Some BIOSes return an incorrect number of sectors */ 673 if (start + end - 1 >= sectors) 674 continue; /* XXX: ignore */ 675#endif 676 if (dp[i].dp_typ == DOSPTYP_EXT || 677 dp[i].dp_typ == DOSPTYP_EXTLBA) 678 has_ext = 1; 679 entry = malloc(sizeof(*entry)); 680 if (entry == NULL) 681 break; 682 entry->part.start = start; 683 entry->part.end = start + end - 1; 684 entry->part.index = i + 1; 685 entry->part.type = mbr_parttype(dp[i].dp_typ); 686 entry->flags = dp[i].dp_flag; 687 entry->type.mbr = dp[i].dp_typ; 688 STAILQ_INSERT_TAIL(&table->entries, entry, entry); 689 DEBUG("new MBR partition added"); 690 } 691 if (has_ext) { 692 table = ptable_ebrread(table, dev, dread); 693 /* FALLTHROUGH */ 694 } 695#endif /* LOADER_MBR_SUPPORT */ 696#endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */ 697out: 698 free(buf); 699 return (table); 700} 701 702void 703ptable_close(struct ptable *table) 704{ 705 struct pentry *entry; 706 707 while (!STAILQ_EMPTY(&table->entries)) { 708 entry = STAILQ_FIRST(&table->entries); 709 STAILQ_REMOVE_HEAD(&table->entries, entry); 710 free(entry); 711 } 712 free(table); 713} 714 715enum ptable_type 716ptable_gettype(const struct ptable *table) 717{ 718 719 return (table->type); 720} 721 722int 723ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index) 724{ 725 struct pentry *entry; 726 727 if (part == NULL || table == NULL) 728 return (EINVAL); 729 730 STAILQ_FOREACH(entry, &table->entries, entry) { 731 if (entry->part.index != index) 732 continue; 733 memcpy(part, &entry->part, sizeof(*part)); 734 return (0); 735 } 736 return (ENOENT); 737} 738 739/* 740 * Search for a slice with the following preferences: 741 * 742 * 1: Active FreeBSD slice 743 * 2: Non-active FreeBSD slice 744 * 3: Active Linux slice 745 * 4: non-active Linux slice 746 * 5: Active FAT/FAT32 slice 747 * 6: non-active FAT/FAT32 slice 748 */ 749#define PREF_RAWDISK 0 750#define PREF_FBSD_ACT 1 751#define PREF_FBSD 2 752#define PREF_LINUX_ACT 3 753#define PREF_LINUX 4 754#define PREF_DOS_ACT 5 755#define PREF_DOS 6 756#define PREF_NONE 7 757int 758ptable_getbestpart(const struct ptable *table, struct ptable_entry *part) 759{ 760 struct pentry *entry, *best; 761 int pref, preflevel; 762 763 if (part == NULL || table == NULL) 764 return (EINVAL); 765 766 best = NULL; 767 preflevel = pref = PREF_NONE; 768 STAILQ_FOREACH(entry, &table->entries, entry) { 769#ifdef LOADER_MBR_SUPPORT 770 if (table->type == PTABLE_MBR) { 771 switch (entry->type.mbr) { 772 case DOSPTYP_386BSD: 773 pref = entry->flags & 0x80 ? PREF_FBSD_ACT: 774 PREF_FBSD; 775 break; 776 case DOSPTYP_LINUX: 777 pref = entry->flags & 0x80 ? PREF_LINUX_ACT: 778 PREF_LINUX; 779 break; 780 case 0x01: /* DOS/Windows */ 781 case 0x04: 782 case 0x06: 783 case 0x0c: 784 case 0x0e: 785 case DOSPTYP_FAT32: 786 pref = entry->flags & 0x80 ? PREF_DOS_ACT: 787 PREF_DOS; 788 break; 789 default: 790 pref = PREF_NONE; 791 } 792 } 793#endif /* LOADER_MBR_SUPPORT */ 794#ifdef LOADER_GPT_SUPPORT 795 if (table->type == PTABLE_GPT) { 796 if (entry->part.type == PART_DOS) 797 pref = PREF_DOS; 798 else if (entry->part.type == PART_FREEBSD_UFS || 799 entry->part.type == PART_FREEBSD_ZFS) 800 pref = PREF_FBSD; 801 else 802 pref = PREF_NONE; 803 } 804#endif /* LOADER_GPT_SUPPORT */ 805 if (pref < preflevel) { 806 preflevel = pref; 807 best = entry; 808 } 809 } 810 if (best != NULL) { 811 memcpy(part, &best->part, sizeof(*part)); 812 return (0); 813 } 814 return (ENOENT); 815} 816 817void 818ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter) 819{ 820 struct pentry *entry; 821 char name[32]; 822 823 name[0] = '\0'; 824 STAILQ_FOREACH(entry, &table->entries, entry) { 825#ifdef LOADER_MBR_SUPPORT 826 if (table->type == PTABLE_MBR) 827 sprintf(name, "s%d", entry->part.index); 828 else 829#endif 830#ifdef LOADER_GPT_SUPPORT 831 if (table->type == PTABLE_GPT) 832 sprintf(name, "p%d", entry->part.index); 833 else 834#endif 835#ifdef LOADER_VTOC8_SUPPORT 836 if (table->type == PTABLE_VTOC8) 837 sprintf(name, "%c", (u_char) 'a' + 838 entry->part.index); 839 else 840#endif 841 if (table->type == PTABLE_BSD) 842 sprintf(name, "%c", (u_char) 'a' + 843 entry->part.index); 844 iter(arg, name, &entry->part); 845 } 846} 847 848