sys/boot/common/part.c

   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
  52 static const uuid_t gpt_uuid_unused = GPT_ENT_TYPE_UNUSED;
  53 static const uuid_t gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
  54 static const uuid_t gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
  55 static const uuid_t gpt_uuid_efi = GPT_ENT_TYPE_EFI;
  56 static const uuid_t gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
  57 static const uuid_t gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
  58 static const uuid_t gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS;
  59 static const uuid_t gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
  60 static const uuid_t gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
  61 static const uuid_t gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
  62 #endif
  63
  64 struct pentry {
  65         struct ptable_entry     part;
  66         uint64_t                flags;
  67         union {
  68                 uint8_t bsd;
  69                 uint8_t mbr;
  70                 uuid_t  gpt;
  71                 uint16_t vtoc8;
  72         } type;
  73         STAILQ_ENTRY(pentry)    entry;
  74 };
  75
  76 struct ptable {
  77         enum ptable_type        type;
  78         uint16_t                sectorsize;
  79         uint64_t                sectors;
  80
  81         STAILQ_HEAD(, pentry)   entries;
  82 };
  83
  84 static struct parttypes {
  85         enum partition_type     type;
  86         const char              *desc;
  87 } ptypes[] = {
  88         { PART_UNKNOWN,         "Unknown" },
  89         { PART_EFI,             "EFI" },
  90         { PART_FREEBSD,         "FreeBSD" },
  91         { PART_FREEBSD_BOOT,    "FreeBSD boot" },
  92         { PART_FREEBSD_NANDFS,  "FreeBSD nandfs" },
  93         { PART_FREEBSD_UFS,     "FreeBSD UFS" },
  94         { PART_FREEBSD_ZFS,     "FreeBSD ZFS" },
  95         { PART_FREEBSD_SWAP,    "FreeBSD swap" },
  96         { PART_FREEBSD_VINUM,   "FreeBSD vinum" },
  97         { PART_LINUX,           "Linux" },
  98         { PART_LINUX_SWAP,      "Linux swap" },
  99         { PART_DOS,             "DOS/Windows" },
 100 };
 101
 102 const char *
 103 parttype2str(enum partition_type type)
 104 {
 105         size_t i;
 106
 107         for (i = 0; i < nitems(ptypes); i++)
 108                 if (ptypes[i].type == type)
 109                         return (ptypes[i].desc);
 110         return (ptypes[0].desc);
 111 }
 112
 113 #ifdef LOADER_GPT_SUPPORT
 114 static void
 115 uuid_letoh(uuid_t *uuid)
 116 {
 117
 118         uuid->time_low = le32toh(uuid->time_low);
 119         uuid->time_mid = le16toh(uuid->time_mid);
 120         uuid->time_hi_and_version = le16toh(uuid->time_hi_and_version);
 121 }
 122
 123 static enum partition_type
 124 gpt_parttype(uuid_t type)
 125 {
 126
 127         if (uuid_equal(&type, &gpt_uuid_efi, NULL))
 128                 return (PART_EFI);
 129         else if (uuid_equal(&type, &gpt_uuid_ms_basic_data, NULL))
 130                 return (PART_DOS);
 131         else if (uuid_equal(&type, &gpt_uuid_freebsd_boot, NULL))
 132                 return (PART_FREEBSD_BOOT);
 133         else if (uuid_equal(&type, &gpt_uuid_freebsd_ufs, NULL))
 134                 return (PART_FREEBSD_UFS);
 135         else if (uuid_equal(&type, &gpt_uuid_freebsd_zfs, NULL))
 136                 return (PART_FREEBSD_ZFS);
 137         else if (uuid_equal(&type, &gpt_uuid_freebsd_swap, NULL))
 138                 return (PART_FREEBSD_SWAP);
 139         else if (uuid_equal(&type, &gpt_uuid_freebsd_vinum, NULL))
 140                 return (PART_FREEBSD_VINUM);
 141         else if (uuid_equal(&type, &gpt_uuid_freebsd_nandfs, NULL))
 142                 return (PART_FREEBSD_NANDFS);
 143         else if (uuid_equal(&type, &gpt_uuid_freebsd, NULL))
 144                 return (PART_FREEBSD);
 145         return (PART_UNKNOWN);
 146 }
 147
 148 static struct gpt_hdr*
 149 gpt_checkhdr(struct gpt_hdr *hdr, uint64_t lba_self, uint64_t lba_last,
 150     uint16_t sectorsize)
 151 {
 152         uint32_t sz, crc;
 153
 154         if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) {
 155                 DEBUG("no GPT signature");
 156                 return (NULL);
 157         }
 158         sz = le32toh(hdr->hdr_size);
 159         if (sz < 92 || sz > sectorsize) {
 160                 DEBUG("invalid GPT header size: %d", sz);
 161                 return (NULL);
 162         }
 163         crc = le32toh(hdr->hdr_crc_self);
 164         hdr->hdr_crc_self = 0;
 165         if (crc32(hdr, sz) != crc) {
 166                 DEBUG("GPT header's CRC doesn't match");
 167                 return (NULL);
 168         }
 169         hdr->hdr_crc_self = crc;
 170         hdr->hdr_revision = le32toh(hdr->hdr_revision);
 171         if (hdr->hdr_revision < GPT_HDR_REVISION) {
 172                 DEBUG("unsupported GPT revision %d", hdr->hdr_revision);
 173                 return (NULL);
 174         }
 175         hdr->hdr_lba_self = le64toh(hdr->hdr_lba_self);
 176         if (hdr->hdr_lba_self != lba_self) {
 177                 DEBUG("self LBA doesn't match");
 178                 return (NULL);
 179         }
 180         hdr->hdr_lba_alt = le64toh(hdr->hdr_lba_alt);
 181         if (hdr->hdr_lba_alt == hdr->hdr_lba_self) {
 182                 DEBUG("invalid alternate LBA");
 183                 return (NULL);
 184         }
 185         hdr->hdr_entries = le32toh(hdr->hdr_entries);
 186         hdr->hdr_entsz = le32toh(hdr->hdr_entsz);
 187         if (hdr->hdr_entries == 0 ||
 188             hdr->hdr_entsz < sizeof(struct gpt_ent) ||
 189             sectorsize % hdr->hdr_entsz != 0) {
 190                 DEBUG("invalid entry size or number of entries");
 191                 return (NULL);
 192         }
 193         hdr->hdr_lba_start = le64toh(hdr->hdr_lba_start);
 194         hdr->hdr_lba_end = le64toh(hdr->hdr_lba_end);
 195         hdr->hdr_lba_table = le64toh(hdr->hdr_lba_table);
 196         hdr->hdr_crc_table = le32toh(hdr->hdr_crc_table);
 197         uuid_letoh(&hdr->hdr_uuid);
 198         return (hdr);
 199 }
 200
 201 static int
 202 gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size,
 203     uint64_t lba_last)
 204 {
 205         struct gpt_ent *ent;
 206         uint32_t i, cnt;
 207
 208         cnt = size / hdr->hdr_entsz;
 209         if (hdr->hdr_entries <= cnt) {
 210                 cnt = hdr->hdr_entries;
 211                 /* Check CRC only when buffer size is enough for table. */
 212                 if (hdr->hdr_crc_table !=
 213                     crc32(tbl, hdr->hdr_entries * hdr->hdr_entsz)) {
 214                         DEBUG("GPT table's CRC doesn't match");
 215                         return (-1);
 216                 }
 217         }
 218         for (i = 0; i < cnt; i++) {
 219                 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz);
 220                 uuid_letoh(&ent->ent_type);
 221                 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL))
 222                         continue;
 223                 ent->ent_lba_start = le64toh(ent->ent_lba_start);
 224                 ent->ent_lba_end = le64toh(ent->ent_lba_end);
 225         }
 226         return (0);
 227 }
 228
 229 static struct ptable*
 230 ptable_gptread(struct ptable *table, void *dev, diskread_t dread)
 231 {
 232         struct pentry *entry;
 233         struct gpt_hdr *phdr, hdr;
 234         struct gpt_ent *ent;
 235         u_char *buf, *tbl;
 236         uint64_t offset;
 237         int pri, sec;
 238         size_t size, i;
 239
 240         buf = malloc(table->sectorsize);
 241         if (buf == NULL)
 242                 return (NULL);
 243         tbl = malloc(table->sectorsize * MAXTBLSZ);
 244         if (tbl == NULL) {
 245                 free(buf);
 246                 return (NULL);
 247         }
 248         /* Read the primary GPT header. */
 249         if (dread(dev, buf, 1, 1) != 0) {
 250                 ptable_close(table);
 251                 table = NULL;
 252                 goto out;
 253         }
 254         pri = sec = 0;
 255         /* Check the primary GPT header. */
 256         phdr = gpt_checkhdr((struct gpt_hdr *)buf, 1, table->sectors - 1,
 257             table->sectorsize);
 258         if (phdr != NULL) {
 259                 /* Read the primary GPT table. */
 260                 size = MIN(MAXTBLSZ,
 261                     howmany(phdr->hdr_entries * phdr->hdr_entsz,
 262                         table->sectorsize));
 263                 if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 &&
 264                     gpt_checktbl(phdr, tbl, size * table->sectorsize,
 265                     table->sectors - 1) == 0) {
 266                         memcpy(&hdr, phdr, sizeof(hdr));
 267                         pri = 1;
 268                 }
 269         }
 270         offset = pri ? hdr.hdr_lba_alt: table->sectors - 1;
 271         /* Read the backup GPT header. */
 272         if (dread(dev, buf, 1, offset) != 0)
 273                 phdr = NULL;
 274         else
 275                 phdr = gpt_checkhdr((struct gpt_hdr *)buf, offset,
 276                     table->sectors - 1, table->sectorsize);
 277         if (phdr != NULL) {
 278                 /*
 279                  * Compare primary and backup headers.
 280                  * If they are equal, then we do not need to read backup
 281                  * table. If they are different, then prefer backup header
 282                  * and try to read backup table.
 283                  */
 284                 if (pri == 0 ||
 285                     uuid_equal(&hdr.hdr_uuid, &phdr->hdr_uuid, NULL) == 0 ||
 286                     hdr.hdr_revision != phdr->hdr_revision ||
 287                     hdr.hdr_size != phdr->hdr_size ||
 288                     hdr.hdr_lba_start != phdr->hdr_lba_start ||
 289                     hdr.hdr_lba_end != phdr->hdr_lba_end ||
 290                     hdr.hdr_entries != phdr->hdr_entries ||
 291                     hdr.hdr_entsz != phdr->hdr_entsz ||
 292                     hdr.hdr_crc_table != phdr->hdr_crc_table) {
 293                         /* Read the backup GPT table. */
 294                         size = MIN(MAXTBLSZ,
 295                                    howmany(phdr->hdr_entries * phdr->hdr_entsz,
 296                                        table->sectorsize));
 297                         if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 &&
 298                             gpt_checktbl(phdr, tbl, size * table->sectorsize,
 299                             table->sectors - 1) == 0) {
 300                                 memcpy(&hdr, phdr, sizeof(hdr));
 301                                 sec = 1;
 302                         }
 303                 }
 304         }
 305         if (pri == 0 && sec == 0) {
 306                 /* Both primary and backup tables are invalid. */
 307                 table->type = PTABLE_NONE;
 308                 goto out;
 309         }
 310         DEBUG("GPT detected");
 311         size = MIN(hdr.hdr_entries * hdr.hdr_entsz,
 312             MAXTBLSZ * table->sectorsize);
 313         for (i = 0; i < size / hdr.hdr_entsz; i++) {
 314                 ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz);
 315                 if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL))
 316                         continue;
 317                 entry = malloc(sizeof(*entry));
 318                 if (entry == NULL)
 319                         break;
 320                 entry->part.start = ent->ent_lba_start;
 321                 entry->part.end = ent->ent_lba_end;
 322                 entry->part.index = i + 1;
 323                 entry->part.type = gpt_parttype(ent->ent_type);
 324                 entry->flags = le64toh(ent->ent_attr);
 325                 memcpy(&entry->type.gpt, &ent->ent_type, sizeof(uuid_t));
 326                 STAILQ_INSERT_TAIL(&table->entries, entry, entry);
 327                 DEBUG("new GPT partition added");
 328         }
 329 out:
 330         free(buf);
 331         free(tbl);
 332         return (table);
 333 }
 334 #endif /* LOADER_GPT_SUPPORT */
 335
 336 #ifdef LOADER_MBR_SUPPORT
 337 /* We do not need to support too many EBR partitions in the loader */
 338 #define MAXEBRENTRIES           8
 339 static enum partition_type
 340 mbr_parttype(uint8_t type)
 341 {
 342
 343         switch (type) {
 344         case DOSPTYP_386BSD:
 345                 return (PART_FREEBSD);
 346         case DOSPTYP_LINSWP:
 347                 return (PART_LINUX_SWAP);
 348         case DOSPTYP_LINUX:
 349                 return (PART_LINUX);
 350         case 0x01:
 351         case 0x04:
 352         case 0x06:
 353         case 0x07:
 354         case 0x0b:
 355         case 0x0c:
 356         case 0x0e:
 357                 return (PART_DOS);
 358         }
 359         return (PART_UNKNOWN);
 360 }
 361
 362 static struct ptable*
 363 ptable_ebrread(struct ptable *table, void *dev, diskread_t dread)
 364 {
 365         struct dos_partition *dp;
 366         struct pentry *e1, *entry;
 367         uint32_t start, end, offset;
 368         u_char *buf;
 369         int i, index;
 370
 371         STAILQ_FOREACH(e1, &table->entries, entry) {
 372                 if (e1->type.mbr == DOSPTYP_EXT ||
 373                     e1->type.mbr == DOSPTYP_EXTLBA)
 374                         break;
 375         }
 376         if (e1 == NULL)
 377                 return (table);
 378         index = 5;
 379         offset = e1->part.start;
 380         buf = malloc(table->sectorsize);
 381         if (buf == NULL)
 382                 return (table);
 383         DEBUG("EBR detected");
 384         for (i = 0; i < MAXEBRENTRIES; i++) {
 385 #if 0   /* Some BIOSes return an incorrect number of sectors */
 386                 if (offset >= table->sectors)
 387                         break;
 388 #endif
 389                 if (dread(dev, buf, 1, offset) != 0)
 390                         break;
 391                 dp = (struct dos_partition *)(buf + DOSPARTOFF);
 392                 if (dp[0].dp_typ == 0)
 393                         break;
 394                 start = le32toh(dp[0].dp_start);
 395                 if (dp[0].dp_typ == DOSPTYP_EXT &&
 396                     dp[1].dp_typ == 0) {
 397                         offset = e1->part.start + start;
 398                         continue;
 399                 }
 400                 end = le32toh(dp[0].dp_size);
 401                 entry = malloc(sizeof(*entry));
 402                 if (entry == NULL)
 403                         break;
 404                 entry->part.start = offset + start;
 405                 entry->part.end = entry->part.start + end - 1;
 406                 entry->part.index = index++;
 407                 entry->part.type = mbr_parttype(dp[0].dp_typ);
 408                 entry->flags = dp[0].dp_flag;
 409                 entry->type.mbr = dp[0].dp_typ;
 410                 STAILQ_INSERT_TAIL(&table->entries, entry, entry);
 411                 DEBUG("new EBR partition added");
 412                 if (dp[1].dp_typ == 0)
 413                         break;
 414                 offset = e1->part.start + le32toh(dp[1].dp_start);
 415         }
 416         free(buf);
 417         return (table);
 418 }
 419 #endif /* LOADER_MBR_SUPPORT */
 420
 421 static enum partition_type
 422 bsd_parttype(uint8_t type)
 423 {
 424
 425         switch (type) {
 426         case FS_NANDFS:
 427                 return (PART_FREEBSD_NANDFS);
 428         case FS_SWAP:
 429                 return (PART_FREEBSD_SWAP);
 430         case FS_BSDFFS:
 431                 return (PART_FREEBSD_UFS);
 432         case FS_VINUM:
 433                 return (PART_FREEBSD_VINUM);
 434         case FS_ZFS:
 435                 return (PART_FREEBSD_ZFS);
 436         }
 437         return (PART_UNKNOWN);
 438 }
 439
 440 static struct ptable*
 441 ptable_bsdread(struct ptable *table, void *dev, diskread_t dread)
 442 {
 443         struct disklabel *dl;
 444         struct partition *part;
 445         struct pentry *entry;
 446         u_char *buf;
 447         uint32_t raw_offset;
 448         int i;
 449
 450         if (table->sectorsize < sizeof(struct disklabel)) {
 451                 DEBUG("Too small sectorsize");
 452                 return (table);
 453         }
 454         buf = malloc(table->sectorsize);
 455         if (buf == NULL)
 456                 return (table);
 457         if (dread(dev, buf, 1, 1) != 0) {
 458                 DEBUG("read failed");
 459                 ptable_close(table);
 460                 table = NULL;
 461                 goto out;
 462         }
 463         dl = (struct disklabel *)buf;
 464         if (le32toh(dl->d_magic) != DISKMAGIC &&
 465             le32toh(dl->d_magic2) != DISKMAGIC)
 466                 goto out;
 467         if (le32toh(dl->d_secsize) != table->sectorsize) {
 468                 DEBUG("unsupported sector size");
 469                 goto out;
 470         }
 471         dl->d_npartitions = le16toh(dl->d_npartitions);
 472         if (dl->d_npartitions > 20 || dl->d_npartitions < 8) {
 473                 DEBUG("invalid number of partitions");
 474                 goto out;
 475         }
 476         DEBUG("BSD detected");
 477         part = &dl->d_partitions[0];
 478         raw_offset = le32toh(part[RAW_PART].p_offset);
 479         for (i = 0; i < dl->d_npartitions; i++, part++) {
 480                 if (i == RAW_PART)
 481                         continue;
 482                 if (part->p_size == 0)
 483                         continue;
 484                 entry = malloc(sizeof(*entry));
 485                 if (entry == NULL)
 486                         break;
 487                 entry->part.start = le32toh(part->p_offset) - raw_offset;
 488                 entry->part.end = entry->part.start +
 489                     le32toh(part->p_size) + 1;
 490                 entry->part.type = bsd_parttype(part->p_fstype);
 491                 entry->part.index = i; /* starts from zero */
 492                 entry->type.bsd = part->p_fstype;
 493                 STAILQ_INSERT_TAIL(&table->entries, entry, entry);
 494                 DEBUG("new BSD partition added");
 495         }
 496         table->type = PTABLE_BSD;
 497 out:
 498         free(buf);
 499         return (table);
 500 }
 501
 502 #ifdef LOADER_VTOC8_SUPPORT
 503 static enum partition_type
 504 vtoc8_parttype(uint16_t type)
 505 {
 506
 507         switch (type) {
 508         case VTOC_TAG_FREEBSD_NANDFS:
 509                 return (PART_FREEBSD_NANDFS);
 510         case VTOC_TAG_FREEBSD_SWAP:
 511                 return (PART_FREEBSD_SWAP);
 512         case VTOC_TAG_FREEBSD_UFS:
 513                 return (PART_FREEBSD_UFS);
 514         case VTOC_TAG_FREEBSD_VINUM:
 515                 return (PART_FREEBSD_VINUM);
 516         case VTOC_TAG_FREEBSD_ZFS:
 517                 return (PART_FREEBSD_ZFS);
 518         }
 519         return (PART_UNKNOWN);
 520 }
 521
 522 static struct ptable*
 523 ptable_vtoc8read(struct ptable *table, void *dev, diskread_t dread)
 524 {
 525         struct pentry *entry;
 526         struct vtoc8 *dl;
 527         u_char *buf;
 528         uint16_t sum, heads, sectors;
 529         int i;
 530
 531         if (table->sectorsize != sizeof(struct vtoc8))
 532                 return (table);
 533         buf = malloc(table->sectorsize);
 534         if (buf == NULL)
 535                 return (table);
 536         if (dread(dev, buf, 1, 0) != 0) {
 537                 DEBUG("read failed");
 538                 ptable_close(table);
 539                 table = NULL;
 540                 goto out;
 541         }
 542         dl = (struct vtoc8 *)buf;
 543         /* Check the sum */
 544         for (i = sum = 0; i < sizeof(struct vtoc8); i += sizeof(sum))
 545                 sum ^= be16dec(buf + i);
 546         if (sum != 0) {
 547                 DEBUG("incorrect checksum");
 548                 goto out;
 549         }
 550         if (be16toh(dl->nparts) != VTOC8_NPARTS) {
 551                 DEBUG("invalid number of entries");
 552                 goto out;
 553         }
 554         sectors = be16toh(dl->nsecs);
 555         heads = be16toh(dl->nheads);
 556         if (sectors * heads == 0) {
 557                 DEBUG("invalid geometry");
 558                 goto out;
 559         }
 560         DEBUG("VTOC8 detected");
 561         for (i = 0; i < VTOC8_NPARTS; i++) {
 562                 dl->part[i].tag = be16toh(dl->part[i].tag);
 563                 if (i == VTOC_RAW_PART ||
 564                     dl->part[i].tag == VTOC_TAG_UNASSIGNED)
 565                         continue;
 566                 entry = malloc(sizeof(*entry));
 567                 if (entry == NULL)
 568                         break;
 569                 entry->part.start = be32toh(dl->map[i].cyl) * heads * sectors;
 570                 entry->part.end = be32toh(dl->map[i].nblks) +
 571                     entry->part.start - 1;
 572                 entry->part.type = vtoc8_parttype(dl->part[i].tag);
 573                 entry->part.index = i; /* starts from zero */
 574                 entry->type.vtoc8 = dl->part[i].tag;
 575                 STAILQ_INSERT_TAIL(&table->entries, entry, entry);
 576                 DEBUG("new VTOC8 partition added");
 577         }
 578         table->type = PTABLE_VTOC8;
 579 out:
 580         free(buf);
 581         return (table);
 582
 583 }
 584 #endif /* LOADER_VTOC8_SUPPORT */
 585
 586 struct ptable*
 587 ptable_open(void *dev, off_t sectors, uint16_t sectorsize,
 588     diskread_t *dread)
 589 {
 590         struct dos_partition *dp;
 591         struct ptable *table;
 592         u_char *buf;
 593         int i, count;
 594 #ifdef LOADER_MBR_SUPPORT
 595         struct pentry *entry;
 596         uint32_t start, end;
 597         int has_ext;
 598 #endif
 599         table = NULL;
 600         buf = malloc(sectorsize);
 601         if (buf == NULL)
 602                 return (NULL);
 603         /* First, read the MBR. */
 604         if (dread(dev, buf, 1, DOSBBSECTOR) != 0) {
 605                 DEBUG("read failed");
 606                 goto out;
 607         }
 608
 609         table = malloc(sizeof(*table));
 610         if (table == NULL)
 611                 goto out;
 612         table->sectors = sectors;
 613         table->sectorsize = sectorsize;
 614         table->type = PTABLE_NONE;
 615         STAILQ_INIT(&table->entries);
 616
 617 #ifdef LOADER_VTOC8_SUPPORT
 618         if (be16dec(buf + offsetof(struct vtoc8, magic)) == VTOC_MAGIC) {
 619                 if (ptable_vtoc8read(table, dev, dread) == NULL) {
 620                         /* Read error. */
 621                         table = NULL;
 622                         goto out;
 623                 } else if (table->type == PTABLE_VTOC8)
 624                         goto out;
 625         }
 626 #endif
 627         /* Check the BSD label. */
 628         if (ptable_bsdread(table, dev, dread) == NULL) { /* Read error. */
 629                 table = NULL;
 630                 goto out;
 631         } else if (table->type == PTABLE_BSD)
 632                 goto out;
 633
 634 #if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT)
 635         /* Check the MBR magic. */
 636         if (buf[DOSMAGICOFFSET] != 0x55 ||
 637             buf[DOSMAGICOFFSET + 1] != 0xaa) {
 638                 DEBUG("magic sequence not found");
 639 #if defined(LOADER_GPT_SUPPORT)
 640                 /* There is no PMBR, check that we have backup GPT */
 641                 table->type = PTABLE_GPT;
 642                 table = ptable_gptread(table, dev, dread);
 643 #endif
 644                 goto out;
 645         }
 646         /* Check that we have PMBR. Also do some validation. */
 647         dp = (struct dos_partition *)(buf + DOSPARTOFF);
 648         for (i = 0, count = 0; i < NDOSPART; i++) {
 649                 if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) {
 650                         DEBUG("invalid partition flag %x", dp[i].dp_flag);
 651                         goto out;
 652                 }
 653 #ifdef LOADER_GPT_SUPPORT
 654                 if (dp[i].dp_typ == DOSPTYP_PMBR) {
 655                         table->type = PTABLE_GPT;
 656                         DEBUG("PMBR detected");
 657                 }
 658 #endif
 659                 if (dp[i].dp_typ != 0)
 660                         count++;
 661         }
 662         /* Do we have some invalid values? */
 663         if (table->type == PTABLE_GPT && count > 1) {
 664                 if (dp[1].dp_typ != DOSPTYP_HFS) {
 665                         table->type = PTABLE_NONE;
 666                         DEBUG("Incorrect PMBR, ignore it");
 667                 } else
 668                         DEBUG("Bootcamp detected");
 669         }
 670 #ifdef LOADER_GPT_SUPPORT
 671         if (table->type == PTABLE_GPT) {
 672                 table = ptable_gptread(table, dev, dread);
 673                 goto out;
 674         }
 675 #endif
 676 #ifdef LOADER_MBR_SUPPORT
 677         /* Read MBR. */
 678         DEBUG("MBR detected");
 679         table->type = PTABLE_MBR;
 680         for (i = has_ext = 0; i < NDOSPART; i++) {
 681                 if (dp[i].dp_typ == 0)
 682                         continue;
 683                 start = le32dec(&(dp[i].dp_start));
 684                 end = le32dec(&(dp[i].dp_size));
 685                 if (start == 0 || end == 0)
 686                         continue;
 687 #if 0   /* Some BIOSes return an incorrect number of sectors */
 688                 if (start + end - 1 >= sectors)
 689                         continue;       /* XXX: ignore */
 690 #endif
 691                 if (dp[i].dp_typ == DOSPTYP_EXT ||
 692                     dp[i].dp_typ == DOSPTYP_EXTLBA)
 693                         has_ext = 1;
 694                 entry = malloc(sizeof(*entry));
 695                 if (entry == NULL)
 696                         break;
 697                 entry->part.start = start;
 698                 entry->part.end = start + end - 1;
 699                 entry->part.index = i + 1;
 700                 entry->part.type = mbr_parttype(dp[i].dp_typ);
 701                 entry->flags = dp[i].dp_flag;
 702                 entry->type.mbr = dp[i].dp_typ;
 703                 STAILQ_INSERT_TAIL(&table->entries, entry, entry);
 704                 DEBUG("new MBR partition added");
 705         }
 706         if (has_ext) {
 707                 table = ptable_ebrread(table, dev, dread);
 708                 /* FALLTHROUGH */
 709         }
 710 #endif /* LOADER_MBR_SUPPORT */
 711 #endif /* LOADER_MBR_SUPPORT || LOADER_GPT_SUPPORT */
 712 out:
 713         free(buf);
 714         return (table);
 715 }
 716
 717 void
 718 ptable_close(struct ptable *table)
 719 {
 720         struct pentry *entry;
 721
 722         while (!STAILQ_EMPTY(&table->entries)) {
 723                 entry = STAILQ_FIRST(&table->entries);
 724                 STAILQ_REMOVE_HEAD(&table->entries, entry);
 725                 free(entry);
 726         }
 727         free(table);
 728 }
 729
 730 enum ptable_type
 731 ptable_gettype(const struct ptable *table)
 732 {
 733
 734         return (table->type);
 735 }
 736
 737 int
 738 ptable_getpart(const struct ptable *table, struct ptable_entry *part, int index)
 739 {
 740         struct pentry *entry;
 741
 742         if (part == NULL || table == NULL)
 743                 return (EINVAL);
 744
 745         STAILQ_FOREACH(entry, &table->entries, entry) {
 746                 if (entry->part.index != index)
 747                         continue;
 748                 memcpy(part, &entry->part, sizeof(*part));
 749                 return (0);
 750         }
 751         return (ENOENT);
 752 }
 753
 754 /*
 755  * Search for a slice with the following preferences:
 756  *
 757  * 1: Active FreeBSD slice
 758  * 2: Non-active FreeBSD slice
 759  * 3: Active Linux slice
 760  * 4: non-active Linux slice
 761  * 5: Active FAT/FAT32 slice
 762  * 6: non-active FAT/FAT32 slice
 763  */
 764 #define PREF_RAWDISK    0
 765 #define PREF_FBSD_ACT   1
 766 #define PREF_FBSD       2
 767 #define PREF_LINUX_ACT  3
 768 #define PREF_LINUX      4
 769 #define PREF_DOS_ACT    5
 770 #define PREF_DOS        6
 771 #define PREF_NONE       7
 772 int
 773 ptable_getbestpart(const struct ptable *table, struct ptable_entry *part)
 774 {
 775         struct pentry *entry, *best;
 776         int pref, preflevel;
 777
 778         if (part == NULL || table == NULL)
 779                 return (EINVAL);
 780
 781         best = NULL;
 782         preflevel = pref = PREF_NONE;
 783         STAILQ_FOREACH(entry, &table->entries, entry) {
 784 #ifdef LOADER_MBR_SUPPORT
 785                 if (table->type == PTABLE_MBR) {
 786                         switch (entry->type.mbr) {
 787                         case DOSPTYP_386BSD:
 788                                 pref = entry->flags & 0x80 ? PREF_FBSD_ACT:
 789                                     PREF_FBSD;
 790                                 break;
 791                         case DOSPTYP_LINUX:
 792                                 pref = entry->flags & 0x80 ? PREF_LINUX_ACT:
 793                                     PREF_LINUX;
 794                                 break;
 795                         case 0x01:              /* DOS/Windows */
 796                         case 0x04:
 797                         case 0x06:
 798                         case 0x0c:
 799                         case 0x0e:
 800                         case DOSPTYP_FAT32:
 801                                 pref = entry->flags & 0x80 ? PREF_DOS_ACT:
 802                                     PREF_DOS;
 803                                 break;
 804                         default:
 805                                 pref = PREF_NONE;
 806                         }
 807                 }
 808 #endif /* LOADER_MBR_SUPPORT */
 809 #ifdef LOADER_GPT_SUPPORT
 810                 if (table->type == PTABLE_GPT) {
 811                         if (entry->part.type == PART_DOS)
 812                                 pref = PREF_DOS;
 813                         else if (entry->part.type == PART_FREEBSD_UFS ||
 814                             entry->part.type == PART_FREEBSD_ZFS)
 815                                 pref = PREF_FBSD;
 816                         else
 817                                 pref = PREF_NONE;
 818                 }
 819 #endif /* LOADER_GPT_SUPPORT */
 820                 if (pref < preflevel) {
 821                         preflevel = pref;
 822                         best = entry;
 823                 }
 824         }
 825         if (best != NULL) {
 826                 memcpy(part, &best->part, sizeof(*part));
 827                 return (0);
 828         }
 829         return (ENOENT);
 830 }
 831
 832 int
 833 ptable_iterate(const struct ptable *table, void *arg, ptable_iterate_t *iter)
 834 {
 835         struct pentry *entry;
 836         char name[32];
 837
 838         name[0] = '\0';
 839         STAILQ_FOREACH(entry, &table->entries, entry) {
 840 #ifdef LOADER_MBR_SUPPORT
 841                 if (table->type == PTABLE_MBR)
 842                         sprintf(name, "s%d", entry->part.index);
 843                 else
 844 #endif
 845 #ifdef LOADER_GPT_SUPPORT
 846                 if (table->type == PTABLE_GPT)
 847                         sprintf(name, "p%d", entry->part.index);
 848                 else
 849 #endif
 850 #ifdef LOADER_VTOC8_SUPPORT
 851                 if (table->type == PTABLE_VTOC8)
 852                         sprintf(name, "%c", (u_char) 'a' +
 853                             entry->part.index);
 854                 else
 855 #endif
 856                 if (table->type == PTABLE_BSD)
 857                         sprintf(name, "%c", (u_char) 'a' +
 858                             entry->part.index);
 859                 if (iter(arg, name, &entry->part))
 860                         return 1;
 861         }
 862         return 0;
 863 }
 864