1 /* 2 * Copyright (C) 2008 RuggedCom, Inc. 3 * Richard Retanubun <RichardRetanubun@RuggedCom.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * NOTE: 10 * when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this 11 * limits the maximum size of addressable storage to < 2 Terra Bytes 12 */ 13 #include <asm/unaligned.h> 14 #include <common.h> 15 #include <command.h> 16 #include <ide.h> 17 #include <inttypes.h> 18 #include <malloc.h> 19 #include <memalign.h> 20 #include <part_efi.h> 21 #include <linux/ctype.h> 22 23 DECLARE_GLOBAL_DATA_PTR; 24 25 #ifdef HAVE_BLOCK_DEVICE 26 /** 27 * efi_crc32() - EFI version of crc32 function 28 * @buf: buffer to calculate crc32 of 29 * @len - length of buf 30 * 31 * Description: Returns EFI-style CRC32 value for @buf 32 */ 33 static inline u32 efi_crc32(const void *buf, u32 len) 34 { 35 return crc32(0, buf, len); 36 } 37 38 /* 39 * Private function prototypes 40 */ 41 42 static int pmbr_part_valid(struct partition *part); 43 static int is_pmbr_valid(legacy_mbr * mbr); 44 static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba, 45 gpt_header *pgpt_head, gpt_entry **pgpt_pte); 46 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 47 gpt_header * pgpt_head); 48 static int is_pte_valid(gpt_entry * pte); 49 50 static char *print_efiname(gpt_entry *pte) 51 { 52 static char name[PARTNAME_SZ + 1]; 53 int i; 54 for (i = 0; i < PARTNAME_SZ; i++) { 55 u8 c; 56 c = pte->partition_name[i] & 0xff; 57 c = (c && !isprint(c)) ? '.' : c; 58 name[i] = c; 59 } 60 name[PARTNAME_SZ] = 0; 61 return name; 62 } 63 64 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; 65 66 static inline int is_bootable(gpt_entry *p) 67 { 68 return p->attributes.fields.legacy_bios_bootable || 69 !memcmp(&(p->partition_type_guid), &system_guid, 70 sizeof(efi_guid_t)); 71 } 72 73 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba, 74 lbaint_t lastlba) 75 { 76 uint32_t crc32_backup = 0; 77 uint32_t calc_crc32; 78 79 /* Check the GPT header signature */ 80 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) { 81 printf("%s signature is wrong: 0x%llX != 0x%llX\n", 82 "GUID Partition Table Header", 83 le64_to_cpu(gpt_h->signature), 84 GPT_HEADER_SIGNATURE); 85 return -1; 86 } 87 88 /* Check the GUID Partition Table CRC */ 89 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup)); 90 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32)); 91 92 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 93 le32_to_cpu(gpt_h->header_size)); 94 95 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup)); 96 97 if (calc_crc32 != le32_to_cpu(crc32_backup)) { 98 printf("%s CRC is wrong: 0x%x != 0x%x\n", 99 "GUID Partition Table Header", 100 le32_to_cpu(crc32_backup), calc_crc32); 101 return -1; 102 } 103 104 /* 105 * Check that the my_lba entry points to the LBA that contains the GPT 106 */ 107 if (le64_to_cpu(gpt_h->my_lba) != lba) { 108 printf("GPT: my_lba incorrect: %llX != " LBAF "\n", 109 le64_to_cpu(gpt_h->my_lba), 110 lba); 111 return -1; 112 } 113 114 /* 115 * Check that the first_usable_lba and that the last_usable_lba are 116 * within the disk. 117 */ 118 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) { 119 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n", 120 le64_to_cpu(gpt_h->first_usable_lba), lastlba); 121 return -1; 122 } 123 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) { 124 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n", 125 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 126 return -1; 127 } 128 129 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: " 130 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba), 131 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 132 133 return 0; 134 } 135 136 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e) 137 { 138 uint32_t calc_crc32; 139 140 /* Check the GUID Partition Table Entry Array CRC */ 141 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 142 le32_to_cpu(gpt_h->num_partition_entries) * 143 le32_to_cpu(gpt_h->sizeof_partition_entry)); 144 145 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) { 146 printf("%s: 0x%x != 0x%x\n", 147 "GUID Partition Table Entry Array CRC is wrong", 148 le32_to_cpu(gpt_h->partition_entry_array_crc32), 149 calc_crc32); 150 return -1; 151 } 152 153 return 0; 154 } 155 156 static void prepare_backup_gpt_header(gpt_header *gpt_h) 157 { 158 uint32_t calc_crc32; 159 uint64_t val; 160 161 /* recalculate the values for the Backup GPT Header */ 162 val = le64_to_cpu(gpt_h->my_lba); 163 gpt_h->my_lba = gpt_h->alternate_lba; 164 gpt_h->alternate_lba = cpu_to_le64(val); 165 gpt_h->partition_entry_lba = 166 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1); 167 gpt_h->header_crc32 = 0; 168 169 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 170 le32_to_cpu(gpt_h->header_size)); 171 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 172 } 173 174 #ifdef CONFIG_EFI_PARTITION 175 /* 176 * Public Functions (include/part.h) 177 */ 178 179 void print_part_efi(block_dev_desc_t * dev_desc) 180 { 181 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 182 gpt_entry *gpt_pte = NULL; 183 int i = 0; 184 char uuid[37]; 185 unsigned char *uuid_bin; 186 187 if (!dev_desc) { 188 printf("%s: Invalid Argument(s)\n", __func__); 189 return; 190 } 191 /* This function validates AND fills in the GPT header and PTE */ 192 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 193 gpt_head, &gpt_pte) != 1) { 194 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 195 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 196 gpt_head, &gpt_pte) != 1) { 197 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 198 __func__); 199 return; 200 } else { 201 printf("%s: *** Using Backup GPT ***\n", 202 __func__); 203 } 204 } 205 206 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 207 208 printf("Part\tStart LBA\tEnd LBA\t\tName\n"); 209 printf("\tAttributes\n"); 210 printf("\tType GUID\n"); 211 printf("\tPartition GUID\n"); 212 213 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { 214 /* Stop at the first non valid PTE */ 215 if (!is_pte_valid(&gpt_pte[i])) 216 break; 217 218 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), 219 le64_to_cpu(gpt_pte[i].starting_lba), 220 le64_to_cpu(gpt_pte[i].ending_lba), 221 print_efiname(&gpt_pte[i])); 222 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); 223 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; 224 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 225 printf("\ttype:\t%s\n", uuid); 226 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; 227 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 228 printf("\tguid:\t%s\n", uuid); 229 } 230 231 /* Remember to free pte */ 232 free(gpt_pte); 233 return; 234 } 235 236 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, 237 disk_partition_t * info) 238 { 239 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 240 gpt_entry *gpt_pte = NULL; 241 242 /* "part" argument must be at least 1 */ 243 if (!dev_desc || !info || part < 1) { 244 printf("%s: Invalid Argument(s)\n", __func__); 245 return -1; 246 } 247 248 /* This function validates AND fills in the GPT header and PTE */ 249 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 250 gpt_head, &gpt_pte) != 1) { 251 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 252 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 253 gpt_head, &gpt_pte) != 1) { 254 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 255 __func__); 256 return -1; 257 } else { 258 printf("%s: *** Using Backup GPT ***\n", 259 __func__); 260 } 261 } 262 263 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 264 !is_pte_valid(&gpt_pte[part - 1])) { 265 debug("%s: *** ERROR: Invalid partition number %d ***\n", 266 __func__, part); 267 free(gpt_pte); 268 return -1; 269 } 270 271 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ 272 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); 273 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 274 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 275 - info->start; 276 info->blksz = dev_desc->blksz; 277 278 sprintf((char *)info->name, "%s", 279 print_efiname(&gpt_pte[part - 1])); 280 sprintf((char *)info->type, "U-Boot"); 281 info->bootable = is_bootable(&gpt_pte[part - 1]); 282 #ifdef CONFIG_PARTITION_UUIDS 283 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, 284 UUID_STR_FORMAT_GUID); 285 #endif 286 #ifdef CONFIG_PARTITION_TYPE_GUID 287 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b, 288 info->type_guid, UUID_STR_FORMAT_GUID); 289 #endif 290 291 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__, 292 info->start, info->size, info->name); 293 294 /* Remember to free pte */ 295 free(gpt_pte); 296 return 0; 297 } 298 299 int get_partition_info_efi_by_name(block_dev_desc_t *dev_desc, 300 const char *name, disk_partition_t *info) 301 { 302 int ret; 303 int i; 304 for (i = 1; i < GPT_ENTRY_NUMBERS; i++) { 305 ret = get_partition_info_efi(dev_desc, i, info); 306 if (ret != 0) { 307 /* no more entries in table */ 308 return -1; 309 } 310 if (strcmp(name, (const char *)info->name) == 0) { 311 /* matched */ 312 return 0; 313 } 314 } 315 return -2; 316 } 317 318 int test_part_efi(block_dev_desc_t * dev_desc) 319 { 320 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); 321 322 /* Read legacy MBR from block 0 and validate it */ 323 if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) 324 || (is_pmbr_valid(legacymbr) != 1)) { 325 return -1; 326 } 327 return 0; 328 } 329 330 /** 331 * set_protective_mbr(): Set the EFI protective MBR 332 * @param dev_desc - block device descriptor 333 * 334 * @return - zero on success, otherwise error 335 */ 336 static int set_protective_mbr(block_dev_desc_t *dev_desc) 337 { 338 /* Setup the Protective MBR */ 339 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1); 340 memset(p_mbr, 0, sizeof(*p_mbr)); 341 342 if (p_mbr == NULL) { 343 printf("%s: calloc failed!\n", __func__); 344 return -1; 345 } 346 /* Append signature */ 347 p_mbr->signature = MSDOS_MBR_SIGNATURE; 348 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; 349 p_mbr->partition_record[0].start_sect = 1; 350 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1; 351 352 /* Write MBR sector to the MMC device */ 353 if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) { 354 printf("** Can't write to device %d **\n", 355 dev_desc->dev); 356 return -1; 357 } 358 359 return 0; 360 } 361 362 int write_gpt_table(block_dev_desc_t *dev_desc, 363 gpt_header *gpt_h, gpt_entry *gpt_e) 364 { 365 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries 366 * sizeof(gpt_entry)), dev_desc); 367 u32 calc_crc32; 368 369 debug("max lba: %x\n", (u32) dev_desc->lba); 370 /* Setup the Protective MBR */ 371 if (set_protective_mbr(dev_desc) < 0) 372 goto err; 373 374 /* Generate CRC for the Primary GPT Header */ 375 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 376 le32_to_cpu(gpt_h->num_partition_entries) * 377 le32_to_cpu(gpt_h->sizeof_partition_entry)); 378 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); 379 380 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 381 le32_to_cpu(gpt_h->header_size)); 382 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 383 384 /* Write the First GPT to the block right after the Legacy MBR */ 385 if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1) 386 goto err; 387 388 if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e) 389 != pte_blk_cnt) 390 goto err; 391 392 prepare_backup_gpt_header(gpt_h); 393 394 if (dev_desc->block_write(dev_desc->dev, 395 (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) 396 + 1, 397 pte_blk_cnt, gpt_e) != pte_blk_cnt) 398 goto err; 399 400 if (dev_desc->block_write(dev_desc->dev, 401 (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, 402 gpt_h) != 1) 403 goto err; 404 405 debug("GPT successfully written to block device!\n"); 406 return 0; 407 408 err: 409 printf("** Can't write to device %d **\n", dev_desc->dev); 410 return -1; 411 } 412 413 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, 414 disk_partition_t *partitions, int parts) 415 { 416 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); 417 lbaint_t start; 418 lbaint_t last_usable_lba = (lbaint_t) 419 le64_to_cpu(gpt_h->last_usable_lba); 420 int i, k; 421 size_t efiname_len, dosname_len; 422 #ifdef CONFIG_PARTITION_UUIDS 423 char *str_uuid; 424 unsigned char *bin_uuid; 425 #endif 426 #ifdef CONFIG_PARTITION_TYPE_GUID 427 char *str_type_guid; 428 unsigned char *bin_type_guid; 429 #endif 430 431 for (i = 0; i < parts; i++) { 432 /* partition starting lba */ 433 start = partitions[i].start; 434 if (start && (start < offset)) { 435 printf("Partition overlap\n"); 436 return -1; 437 } 438 if (start) { 439 gpt_e[i].starting_lba = cpu_to_le64(start); 440 offset = start + partitions[i].size; 441 } else { 442 gpt_e[i].starting_lba = cpu_to_le64(offset); 443 offset += partitions[i].size; 444 } 445 if (offset >= last_usable_lba) { 446 printf("Partitions layout exceds disk size\n"); 447 return -1; 448 } 449 /* partition ending lba */ 450 if ((i == parts - 1) && (partitions[i].size == 0)) 451 /* extend the last partition to maximuim */ 452 gpt_e[i].ending_lba = gpt_h->last_usable_lba; 453 else 454 gpt_e[i].ending_lba = cpu_to_le64(offset - 1); 455 456 #ifdef CONFIG_PARTITION_TYPE_GUID 457 str_type_guid = partitions[i].type_guid; 458 bin_type_guid = gpt_e[i].partition_type_guid.b; 459 if (strlen(str_type_guid)) { 460 if (uuid_str_to_bin(str_type_guid, bin_type_guid, 461 UUID_STR_FORMAT_GUID)) { 462 printf("Partition no. %d: invalid type guid: %s\n", 463 i, str_type_guid); 464 return -1; 465 } 466 } else { 467 /* default partition type GUID */ 468 memcpy(bin_type_guid, 469 &PARTITION_BASIC_DATA_GUID, 16); 470 } 471 #else 472 /* partition type GUID */ 473 memcpy(gpt_e[i].partition_type_guid.b, 474 &PARTITION_BASIC_DATA_GUID, 16); 475 #endif 476 477 #ifdef CONFIG_PARTITION_UUIDS 478 str_uuid = partitions[i].uuid; 479 bin_uuid = gpt_e[i].unique_partition_guid.b; 480 481 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) { 482 printf("Partition no. %d: invalid guid: %s\n", 483 i, str_uuid); 484 return -1; 485 } 486 #endif 487 488 /* partition attributes */ 489 memset(&gpt_e[i].attributes, 0, 490 sizeof(gpt_entry_attributes)); 491 492 /* partition name */ 493 efiname_len = sizeof(gpt_e[i].partition_name) 494 / sizeof(efi_char16_t); 495 dosname_len = sizeof(partitions[i].name); 496 497 memset(gpt_e[i].partition_name, 0, 498 sizeof(gpt_e[i].partition_name)); 499 500 for (k = 0; k < min(dosname_len, efiname_len); k++) 501 gpt_e[i].partition_name[k] = 502 (efi_char16_t)(partitions[i].name[k]); 503 504 debug("%s: name: %s offset[%d]: 0x" LBAF 505 " size[%d]: 0x" LBAF "\n", 506 __func__, partitions[i].name, i, 507 offset, i, partitions[i].size); 508 } 509 510 return 0; 511 } 512 513 int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h, 514 char *str_guid, int parts_count) 515 { 516 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); 517 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); 518 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); 519 gpt_h->my_lba = cpu_to_le64(1); 520 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); 521 gpt_h->first_usable_lba = cpu_to_le64(34); 522 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); 523 gpt_h->partition_entry_lba = cpu_to_le64(2); 524 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); 525 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); 526 gpt_h->header_crc32 = 0; 527 gpt_h->partition_entry_array_crc32 = 0; 528 529 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) 530 return -1; 531 532 return 0; 533 } 534 535 int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid, 536 disk_partition_t *partitions, int parts_count) 537 { 538 int ret; 539 540 gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header), 541 dev_desc)); 542 gpt_entry *gpt_e; 543 544 if (gpt_h == NULL) { 545 printf("%s: calloc failed!\n", __func__); 546 return -1; 547 } 548 549 gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS 550 * sizeof(gpt_entry), 551 dev_desc)); 552 if (gpt_e == NULL) { 553 printf("%s: calloc failed!\n", __func__); 554 free(gpt_h); 555 return -1; 556 } 557 558 /* Generate Primary GPT header (LBA1) */ 559 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); 560 if (ret) 561 goto err; 562 563 /* Generate partition entries */ 564 ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count); 565 if (ret) 566 goto err; 567 568 /* Write GPT partition table */ 569 ret = write_gpt_table(dev_desc, gpt_h, gpt_e); 570 571 err: 572 free(gpt_e); 573 free(gpt_h); 574 return ret; 575 } 576 577 int is_valid_gpt_buf(block_dev_desc_t *dev_desc, void *buf) 578 { 579 gpt_header *gpt_h; 580 gpt_entry *gpt_e; 581 582 /* determine start of GPT Header in the buffer */ 583 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 584 dev_desc->blksz); 585 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA, 586 dev_desc->lba)) 587 return -1; 588 589 /* determine start of GPT Entries in the buffer */ 590 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 591 dev_desc->blksz); 592 if (validate_gpt_entries(gpt_h, gpt_e)) 593 return -1; 594 595 return 0; 596 } 597 598 int write_mbr_and_gpt_partitions(block_dev_desc_t *dev_desc, void *buf) 599 { 600 gpt_header *gpt_h; 601 gpt_entry *gpt_e; 602 int gpt_e_blk_cnt; 603 lbaint_t lba; 604 int cnt; 605 606 if (is_valid_gpt_buf(dev_desc, buf)) 607 return -1; 608 609 /* determine start of GPT Header in the buffer */ 610 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 611 dev_desc->blksz); 612 613 /* determine start of GPT Entries in the buffer */ 614 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 615 dev_desc->blksz); 616 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) * 617 le32_to_cpu(gpt_h->sizeof_partition_entry)), 618 dev_desc); 619 620 /* write MBR */ 621 lba = 0; /* MBR is always at 0 */ 622 cnt = 1; /* MBR (1 block) */ 623 if (dev_desc->block_write(dev_desc->dev, lba, cnt, buf) != cnt) { 624 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 625 __func__, "MBR", cnt, lba); 626 return 1; 627 } 628 629 /* write Primary GPT */ 630 lba = GPT_PRIMARY_PARTITION_TABLE_LBA; 631 cnt = 1; /* GPT Header (1 block) */ 632 if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) { 633 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 634 __func__, "Primary GPT Header", cnt, lba); 635 return 1; 636 } 637 638 lba = le64_to_cpu(gpt_h->partition_entry_lba); 639 cnt = gpt_e_blk_cnt; 640 if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) { 641 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 642 __func__, "Primary GPT Entries", cnt, lba); 643 return 1; 644 } 645 646 prepare_backup_gpt_header(gpt_h); 647 648 /* write Backup GPT */ 649 lba = le64_to_cpu(gpt_h->partition_entry_lba); 650 cnt = gpt_e_blk_cnt; 651 if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_e) != cnt) { 652 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 653 __func__, "Backup GPT Entries", cnt, lba); 654 return 1; 655 } 656 657 lba = le64_to_cpu(gpt_h->my_lba); 658 cnt = 1; /* GPT Header (1 block) */ 659 if (dev_desc->block_write(dev_desc->dev, lba, cnt, gpt_h) != cnt) { 660 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 661 __func__, "Backup GPT Header", cnt, lba); 662 return 1; 663 } 664 665 return 0; 666 } 667 #endif 668 669 /* 670 * Private functions 671 */ 672 /* 673 * pmbr_part_valid(): Check for EFI partition signature 674 * 675 * Returns: 1 if EFI GPT partition type is found. 676 */ 677 static int pmbr_part_valid(struct partition *part) 678 { 679 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 680 get_unaligned_le32(&part->start_sect) == 1UL) { 681 return 1; 682 } 683 684 return 0; 685 } 686 687 /* 688 * is_pmbr_valid(): test Protective MBR for validity 689 * 690 * Returns: 1 if PMBR is valid, 0 otherwise. 691 * Validity depends on two things: 692 * 1) MSDOS signature is in the last two bytes of the MBR 693 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 694 */ 695 static int is_pmbr_valid(legacy_mbr * mbr) 696 { 697 int i = 0; 698 699 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 700 return 0; 701 702 for (i = 0; i < 4; i++) { 703 if (pmbr_part_valid(&mbr->partition_record[i])) { 704 return 1; 705 } 706 } 707 return 0; 708 } 709 710 /** 711 * is_gpt_valid() - tests one GPT header and PTEs for validity 712 * 713 * lba is the logical block address of the GPT header to test 714 * gpt is a GPT header ptr, filled on return. 715 * ptes is a PTEs ptr, filled on return. 716 * 717 * Description: returns 1 if valid, 0 on error. 718 * If valid, returns pointers to PTEs. 719 */ 720 static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba, 721 gpt_header *pgpt_head, gpt_entry **pgpt_pte) 722 { 723 if (!dev_desc || !pgpt_head) { 724 printf("%s: Invalid Argument(s)\n", __func__); 725 return 0; 726 } 727 728 /* Read GPT Header from device */ 729 if (dev_desc->block_read(dev_desc->dev, (lbaint_t)lba, 1, pgpt_head) 730 != 1) { 731 printf("*** ERROR: Can't read GPT header ***\n"); 732 return 0; 733 } 734 735 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba)) 736 return 0; 737 738 /* Read and allocate Partition Table Entries */ 739 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 740 if (*pgpt_pte == NULL) { 741 printf("GPT: Failed to allocate memory for PTE\n"); 742 return 0; 743 } 744 745 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) { 746 free(*pgpt_pte); 747 return 0; 748 } 749 750 /* We're done, all's well */ 751 return 1; 752 } 753 754 /** 755 * alloc_read_gpt_entries(): reads partition entries from disk 756 * @dev_desc 757 * @gpt - GPT header 758 * 759 * Description: Returns ptes on success, NULL on error. 760 * Allocates space for PTEs based on information found in @gpt. 761 * Notes: remember to free pte when you're done! 762 */ 763 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 764 gpt_header * pgpt_head) 765 { 766 size_t count = 0, blk_cnt; 767 gpt_entry *pte = NULL; 768 769 if (!dev_desc || !pgpt_head) { 770 printf("%s: Invalid Argument(s)\n", __func__); 771 return NULL; 772 } 773 774 count = le32_to_cpu(pgpt_head->num_partition_entries) * 775 le32_to_cpu(pgpt_head->sizeof_partition_entry); 776 777 debug("%s: count = %u * %u = %zu\n", __func__, 778 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 779 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); 780 781 /* Allocate memory for PTE, remember to FREE */ 782 if (count != 0) { 783 pte = memalign(ARCH_DMA_MINALIGN, 784 PAD_TO_BLOCKSIZE(count, dev_desc)); 785 } 786 787 if (count == 0 || pte == NULL) { 788 printf("%s: ERROR: Can't allocate 0x%zX " 789 "bytes for GPT Entries\n", 790 __func__, count); 791 return NULL; 792 } 793 794 /* Read GPT Entries from device */ 795 blk_cnt = BLOCK_CNT(count, dev_desc); 796 if (dev_desc->block_read (dev_desc->dev, 797 (lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba), 798 (lbaint_t) (blk_cnt), pte) 799 != blk_cnt) { 800 801 printf("*** ERROR: Can't read GPT Entries ***\n"); 802 free(pte); 803 return NULL; 804 } 805 return pte; 806 } 807 808 /** 809 * is_pte_valid(): validates a single Partition Table Entry 810 * @gpt_entry - Pointer to a single Partition Table Entry 811 * 812 * Description: returns 1 if valid, 0 on error. 813 */ 814 static int is_pte_valid(gpt_entry * pte) 815 { 816 efi_guid_t unused_guid; 817 818 if (!pte) { 819 printf("%s: Invalid Argument(s)\n", __func__); 820 return 0; 821 } 822 823 /* Only one validation for now: 824 * The GUID Partition Type != Unused Entry (ALL-ZERO) 825 */ 826 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 827 828 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 829 sizeof(unused_guid.b)) == 0) { 830 831 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 832 (unsigned int)(uintptr_t)pte); 833 834 return 0; 835 } else { 836 return 1; 837 } 838 } 839 #endif 840