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 <fdtdec.h> 17 #include <ide.h> 18 #include <inttypes.h> 19 #include <malloc.h> 20 #include <memalign.h> 21 #include <part_efi.h> 22 #include <linux/compiler.h> 23 #include <linux/ctype.h> 24 25 DECLARE_GLOBAL_DATA_PTR; 26 27 #ifdef CONFIG_HAVE_BLOCK_DEVICE 28 /** 29 * efi_crc32() - EFI version of crc32 function 30 * @buf: buffer to calculate crc32 of 31 * @len - length of buf 32 * 33 * Description: Returns EFI-style CRC32 value for @buf 34 */ 35 static inline u32 efi_crc32(const void *buf, u32 len) 36 { 37 return crc32(0, buf, len); 38 } 39 40 /* 41 * Private function prototypes 42 */ 43 44 static int pmbr_part_valid(struct partition *part); 45 static int is_pmbr_valid(legacy_mbr * mbr); 46 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, 47 gpt_header *pgpt_head, gpt_entry **pgpt_pte); 48 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, 49 gpt_header *pgpt_head); 50 static int is_pte_valid(gpt_entry * pte); 51 52 static char *print_efiname(gpt_entry *pte) 53 { 54 static char name[PARTNAME_SZ + 1]; 55 int i; 56 for (i = 0; i < PARTNAME_SZ; i++) { 57 u8 c; 58 c = pte->partition_name[i] & 0xff; 59 c = (c && !isprint(c)) ? '.' : c; 60 name[i] = c; 61 } 62 name[PARTNAME_SZ] = 0; 63 return name; 64 } 65 66 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; 67 68 static inline int is_bootable(gpt_entry *p) 69 { 70 return p->attributes.fields.legacy_bios_bootable || 71 !memcmp(&(p->partition_type_guid), &system_guid, 72 sizeof(efi_guid_t)); 73 } 74 75 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba, 76 lbaint_t lastlba) 77 { 78 uint32_t crc32_backup = 0; 79 uint32_t calc_crc32; 80 81 /* Check the GPT header signature */ 82 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) { 83 printf("%s signature is wrong: 0x%llX != 0x%llX\n", 84 "GUID Partition Table Header", 85 le64_to_cpu(gpt_h->signature), 86 GPT_HEADER_SIGNATURE); 87 return -1; 88 } 89 90 /* Check the GUID Partition Table CRC */ 91 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup)); 92 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32)); 93 94 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 95 le32_to_cpu(gpt_h->header_size)); 96 97 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup)); 98 99 if (calc_crc32 != le32_to_cpu(crc32_backup)) { 100 printf("%s CRC is wrong: 0x%x != 0x%x\n", 101 "GUID Partition Table Header", 102 le32_to_cpu(crc32_backup), calc_crc32); 103 return -1; 104 } 105 106 /* 107 * Check that the my_lba entry points to the LBA that contains the GPT 108 */ 109 if (le64_to_cpu(gpt_h->my_lba) != lba) { 110 printf("GPT: my_lba incorrect: %llX != " LBAF "\n", 111 le64_to_cpu(gpt_h->my_lba), 112 lba); 113 return -1; 114 } 115 116 /* 117 * Check that the first_usable_lba and that the last_usable_lba are 118 * within the disk. 119 */ 120 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) { 121 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n", 122 le64_to_cpu(gpt_h->first_usable_lba), lastlba); 123 return -1; 124 } 125 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) { 126 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n", 127 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 128 return -1; 129 } 130 131 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: " 132 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba), 133 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 134 135 return 0; 136 } 137 138 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e) 139 { 140 uint32_t calc_crc32; 141 142 /* Check the GUID Partition Table Entry Array CRC */ 143 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 144 le32_to_cpu(gpt_h->num_partition_entries) * 145 le32_to_cpu(gpt_h->sizeof_partition_entry)); 146 147 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) { 148 printf("%s: 0x%x != 0x%x\n", 149 "GUID Partition Table Entry Array CRC is wrong", 150 le32_to_cpu(gpt_h->partition_entry_array_crc32), 151 calc_crc32); 152 return -1; 153 } 154 155 return 0; 156 } 157 158 static void prepare_backup_gpt_header(gpt_header *gpt_h) 159 { 160 uint32_t calc_crc32; 161 uint64_t val; 162 163 /* recalculate the values for the Backup GPT Header */ 164 val = le64_to_cpu(gpt_h->my_lba); 165 gpt_h->my_lba = gpt_h->alternate_lba; 166 gpt_h->alternate_lba = cpu_to_le64(val); 167 gpt_h->partition_entry_lba = 168 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1); 169 gpt_h->header_crc32 = 0; 170 171 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 172 le32_to_cpu(gpt_h->header_size)); 173 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 174 } 175 176 #if CONFIG_IS_ENABLED(EFI_PARTITION) 177 /* 178 * Public Functions (include/part.h) 179 */ 180 181 /* 182 * UUID is displayed as 32 hexadecimal digits, in 5 groups, 183 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters 184 */ 185 int get_disk_guid(struct blk_desc * dev_desc, char *guid) 186 { 187 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 188 gpt_entry *gpt_pte = NULL; 189 unsigned char *guid_bin; 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 -EINVAL; 200 } else { 201 printf("%s: *** Using Backup GPT ***\n", 202 __func__); 203 } 204 } 205 206 guid_bin = gpt_head->disk_guid.b; 207 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID); 208 209 return 0; 210 } 211 212 void part_print_efi(struct blk_desc *dev_desc) 213 { 214 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 215 gpt_entry *gpt_pte = NULL; 216 int i = 0; 217 char uuid[UUID_STR_LEN + 1]; 218 unsigned char *uuid_bin; 219 220 /* This function validates AND fills in the GPT header and PTE */ 221 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 222 gpt_head, &gpt_pte) != 1) { 223 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 224 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 225 gpt_head, &gpt_pte) != 1) { 226 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 227 __func__); 228 return; 229 } else { 230 printf("%s: *** Using Backup GPT ***\n", 231 __func__); 232 } 233 } 234 235 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 236 237 printf("Part\tStart LBA\tEnd LBA\t\tName\n"); 238 printf("\tAttributes\n"); 239 printf("\tType GUID\n"); 240 printf("\tPartition GUID\n"); 241 242 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { 243 /* Stop at the first non valid PTE */ 244 if (!is_pte_valid(&gpt_pte[i])) 245 break; 246 247 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), 248 le64_to_cpu(gpt_pte[i].starting_lba), 249 le64_to_cpu(gpt_pte[i].ending_lba), 250 print_efiname(&gpt_pte[i])); 251 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); 252 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; 253 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 254 printf("\ttype:\t%s\n", uuid); 255 #ifdef CONFIG_PARTITION_TYPE_GUID 256 if (!uuid_guid_get_str(uuid_bin, uuid)) 257 printf("\ttype:\t%s\n", uuid); 258 #endif 259 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; 260 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 261 printf("\tguid:\t%s\n", uuid); 262 } 263 264 /* Remember to free pte */ 265 free(gpt_pte); 266 return; 267 } 268 269 int part_get_info_efi(struct blk_desc *dev_desc, int part, 270 disk_partition_t *info) 271 { 272 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 273 gpt_entry *gpt_pte = NULL; 274 275 /* "part" argument must be at least 1 */ 276 if (part < 1) { 277 printf("%s: Invalid Argument(s)\n", __func__); 278 return -1; 279 } 280 281 /* This function validates AND fills in the GPT header and PTE */ 282 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 283 gpt_head, &gpt_pte) != 1) { 284 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 285 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 286 gpt_head, &gpt_pte) != 1) { 287 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 288 __func__); 289 return -1; 290 } else { 291 printf("%s: *** Using Backup GPT ***\n", 292 __func__); 293 } 294 } 295 296 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 297 !is_pte_valid(&gpt_pte[part - 1])) { 298 debug("%s: *** ERROR: Invalid partition number %d ***\n", 299 __func__, part); 300 free(gpt_pte); 301 return -1; 302 } 303 304 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ 305 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); 306 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 307 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 308 - info->start; 309 info->blksz = dev_desc->blksz; 310 311 sprintf((char *)info->name, "%s", 312 print_efiname(&gpt_pte[part - 1])); 313 strcpy((char *)info->type, "U-Boot"); 314 info->bootable = is_bootable(&gpt_pte[part - 1]); 315 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 316 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, 317 UUID_STR_FORMAT_GUID); 318 #endif 319 #ifdef CONFIG_PARTITION_TYPE_GUID 320 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b, 321 info->type_guid, UUID_STR_FORMAT_GUID); 322 #endif 323 324 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__, 325 info->start, info->size, info->name); 326 327 /* Remember to free pte */ 328 free(gpt_pte); 329 return 0; 330 } 331 332 static int part_test_efi(struct blk_desc *dev_desc) 333 { 334 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); 335 336 /* Read legacy MBR from block 0 and validate it */ 337 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1) 338 || (is_pmbr_valid(legacymbr) != 1)) { 339 return -1; 340 } 341 return 0; 342 } 343 344 /** 345 * set_protective_mbr(): Set the EFI protective MBR 346 * @param dev_desc - block device descriptor 347 * 348 * @return - zero on success, otherwise error 349 */ 350 static int set_protective_mbr(struct blk_desc *dev_desc) 351 { 352 /* Setup the Protective MBR */ 353 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz); 354 memset(p_mbr, 0, sizeof(*p_mbr)); 355 356 if (p_mbr == NULL) { 357 printf("%s: calloc failed!\n", __func__); 358 return -1; 359 } 360 361 /* Read MBR to backup boot code if it exists */ 362 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) { 363 pr_err("** Can't read from device %d **\n", dev_desc->devnum); 364 return -1; 365 } 366 367 /* Append signature */ 368 p_mbr->signature = MSDOS_MBR_SIGNATURE; 369 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; 370 p_mbr->partition_record[0].start_sect = 1; 371 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1; 372 373 /* Write MBR sector to the MMC device */ 374 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) { 375 printf("** Can't write to device %d **\n", 376 dev_desc->devnum); 377 return -1; 378 } 379 380 return 0; 381 } 382 383 int write_gpt_table(struct blk_desc *dev_desc, 384 gpt_header *gpt_h, gpt_entry *gpt_e) 385 { 386 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries 387 * sizeof(gpt_entry)), dev_desc); 388 u32 calc_crc32; 389 390 debug("max lba: %x\n", (u32) dev_desc->lba); 391 /* Setup the Protective MBR */ 392 if (set_protective_mbr(dev_desc) < 0) 393 goto err; 394 395 /* Generate CRC for the Primary GPT Header */ 396 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 397 le32_to_cpu(gpt_h->num_partition_entries) * 398 le32_to_cpu(gpt_h->sizeof_partition_entry)); 399 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); 400 401 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 402 le32_to_cpu(gpt_h->header_size)); 403 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 404 405 /* Write the First GPT to the block right after the Legacy MBR */ 406 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1) 407 goto err; 408 409 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba), 410 pte_blk_cnt, gpt_e) != pte_blk_cnt) 411 goto err; 412 413 prepare_backup_gpt_header(gpt_h); 414 415 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) 416 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt) 417 goto err; 418 419 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, 420 gpt_h) != 1) 421 goto err; 422 423 debug("GPT successfully written to block device!\n"); 424 return 0; 425 426 err: 427 printf("** Can't write to device %d **\n", dev_desc->devnum); 428 return -1; 429 } 430 431 int gpt_fill_pte(struct blk_desc *dev_desc, 432 gpt_header *gpt_h, gpt_entry *gpt_e, 433 disk_partition_t *partitions, int parts) 434 { 435 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); 436 lbaint_t last_usable_lba = (lbaint_t) 437 le64_to_cpu(gpt_h->last_usable_lba); 438 int i, k; 439 size_t efiname_len, dosname_len; 440 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 441 char *str_uuid; 442 unsigned char *bin_uuid; 443 #endif 444 #ifdef CONFIG_PARTITION_TYPE_GUID 445 char *str_type_guid; 446 unsigned char *bin_type_guid; 447 #endif 448 size_t hdr_start = gpt_h->my_lba; 449 size_t hdr_end = hdr_start + 1; 450 451 size_t pte_start = gpt_h->partition_entry_lba; 452 size_t pte_end = pte_start + 453 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry / 454 dev_desc->blksz; 455 456 for (i = 0; i < parts; i++) { 457 /* partition starting lba */ 458 lbaint_t start = partitions[i].start; 459 lbaint_t size = partitions[i].size; 460 461 if (start) { 462 offset = start + size; 463 } else { 464 start = offset; 465 offset += size; 466 } 467 468 /* 469 * If our partition overlaps with either the GPT 470 * header, or the partition entry, reject it. 471 */ 472 if (((start < hdr_end && hdr_start < (start + size)) || 473 (start < pte_end && pte_start < (start + size)))) { 474 printf("Partition overlap\n"); 475 return -1; 476 } 477 478 gpt_e[i].starting_lba = cpu_to_le64(start); 479 480 if (offset > (last_usable_lba + 1)) { 481 printf("Partitions layout exceds disk size\n"); 482 return -1; 483 } 484 /* partition ending lba */ 485 if ((i == parts - 1) && (size == 0)) 486 /* extend the last partition to maximuim */ 487 gpt_e[i].ending_lba = gpt_h->last_usable_lba; 488 else 489 gpt_e[i].ending_lba = cpu_to_le64(offset - 1); 490 491 #ifdef CONFIG_PARTITION_TYPE_GUID 492 str_type_guid = partitions[i].type_guid; 493 bin_type_guid = gpt_e[i].partition_type_guid.b; 494 if (strlen(str_type_guid)) { 495 if (uuid_str_to_bin(str_type_guid, bin_type_guid, 496 UUID_STR_FORMAT_GUID)) { 497 printf("Partition no. %d: invalid type guid: %s\n", 498 i, str_type_guid); 499 return -1; 500 } 501 } else { 502 /* default partition type GUID */ 503 memcpy(bin_type_guid, 504 &PARTITION_BASIC_DATA_GUID, 16); 505 } 506 #else 507 /* partition type GUID */ 508 memcpy(gpt_e[i].partition_type_guid.b, 509 &PARTITION_BASIC_DATA_GUID, 16); 510 #endif 511 512 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 513 str_uuid = partitions[i].uuid; 514 bin_uuid = gpt_e[i].unique_partition_guid.b; 515 516 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) { 517 printf("Partition no. %d: invalid guid: %s\n", 518 i, str_uuid); 519 return -1; 520 } 521 #endif 522 523 /* partition attributes */ 524 memset(&gpt_e[i].attributes, 0, 525 sizeof(gpt_entry_attributes)); 526 527 if (partitions[i].bootable) 528 gpt_e[i].attributes.fields.legacy_bios_bootable = 1; 529 530 /* partition name */ 531 efiname_len = sizeof(gpt_e[i].partition_name) 532 / sizeof(efi_char16_t); 533 dosname_len = sizeof(partitions[i].name); 534 535 memset(gpt_e[i].partition_name, 0, 536 sizeof(gpt_e[i].partition_name)); 537 538 for (k = 0; k < min(dosname_len, efiname_len); k++) 539 gpt_e[i].partition_name[k] = 540 (efi_char16_t)(partitions[i].name[k]); 541 542 debug("%s: name: %s offset[%d]: 0x" LBAF 543 " size[%d]: 0x" LBAF "\n", 544 __func__, partitions[i].name, i, 545 offset, i, size); 546 } 547 548 return 0; 549 } 550 551 static uint32_t partition_entries_offset(struct blk_desc *dev_desc) 552 { 553 uint32_t offset_blks = 2; 554 uint32_t __maybe_unused offset_bytes; 555 int __maybe_unused config_offset; 556 557 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF) 558 /* 559 * Some architectures require their SPL loader at a fixed 560 * address within the first 16KB of the disk. To avoid an 561 * overlap with the partition entries of the EFI partition 562 * table, the first safe offset (in bytes, from the start of 563 * the disk) for the entries can be set in 564 * CONFIG_EFI_PARTITION_ENTRIES_OFF. 565 */ 566 offset_bytes = 567 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc); 568 offset_blks = offset_bytes / dev_desc->blksz; 569 #endif 570 571 #if defined(CONFIG_OF_CONTROL) 572 /* 573 * Allow the offset of the first partition entires (in bytes 574 * from the start of the device) to be specified as a property 575 * of the device tree '/config' node. 576 */ 577 config_offset = fdtdec_get_config_int(gd->fdt_blob, 578 "u-boot,efi-partition-entries-offset", 579 -EINVAL); 580 if (config_offset != -EINVAL) { 581 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc); 582 offset_blks = offset_bytes / dev_desc->blksz; 583 } 584 #endif 585 586 debug("efi: partition entries offset (in blocks): %d\n", offset_blks); 587 588 /* 589 * The earliest LBA this can be at is LBA#2 (i.e. right behind 590 * the (protective) MBR and the GPT header. 591 */ 592 if (offset_blks < 2) 593 offset_blks = 2; 594 595 return offset_blks; 596 } 597 598 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, 599 char *str_guid, int parts_count) 600 { 601 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); 602 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); 603 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); 604 gpt_h->my_lba = cpu_to_le64(1); 605 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); 606 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); 607 gpt_h->partition_entry_lba = 608 cpu_to_le64(partition_entries_offset(dev_desc)); 609 gpt_h->first_usable_lba = 610 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32); 611 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); 612 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); 613 gpt_h->header_crc32 = 0; 614 gpt_h->partition_entry_array_crc32 = 0; 615 616 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) 617 return -1; 618 619 return 0; 620 } 621 622 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid, 623 disk_partition_t *partitions, int parts_count) 624 { 625 gpt_header *gpt_h; 626 gpt_entry *gpt_e; 627 int ret, size; 628 629 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc); 630 gpt_h = malloc_cache_aligned(size); 631 if (gpt_h == NULL) { 632 printf("%s: calloc failed!\n", __func__); 633 return -1; 634 } 635 memset(gpt_h, 0, size); 636 637 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry), 638 dev_desc); 639 gpt_e = malloc_cache_aligned(size); 640 if (gpt_e == NULL) { 641 printf("%s: calloc failed!\n", __func__); 642 free(gpt_h); 643 return -1; 644 } 645 memset(gpt_e, 0, size); 646 647 /* Generate Primary GPT header (LBA1) */ 648 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); 649 if (ret) 650 goto err; 651 652 /* Generate partition entries */ 653 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count); 654 if (ret) 655 goto err; 656 657 /* Write GPT partition table */ 658 ret = write_gpt_table(dev_desc, gpt_h, gpt_e); 659 660 err: 661 free(gpt_e); 662 free(gpt_h); 663 return ret; 664 } 665 666 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n) 667 { 668 char *ess = (char *)es; 669 int i, j; 670 671 memset(s, '\0', n); 672 673 for (i = 0, j = 0; j < n; i += 2, j++) { 674 s[j] = ess[i]; 675 if (!ess[i]) 676 return; 677 } 678 } 679 680 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head, 681 gpt_entry **gpt_pte) 682 { 683 /* 684 * This function validates AND 685 * fills in the GPT header and PTE 686 */ 687 if (is_gpt_valid(dev_desc, 688 GPT_PRIMARY_PARTITION_TABLE_LBA, 689 gpt_head, gpt_pte) != 1) { 690 printf("%s: *** ERROR: Invalid GPT ***\n", 691 __func__); 692 return -1; 693 } 694 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 695 gpt_head, gpt_pte) != 1) { 696 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 697 __func__); 698 return -1; 699 } 700 701 return 0; 702 } 703 704 int gpt_verify_partitions(struct blk_desc *dev_desc, 705 disk_partition_t *partitions, int parts, 706 gpt_header *gpt_head, gpt_entry **gpt_pte) 707 { 708 char efi_str[PARTNAME_SZ + 1]; 709 u64 gpt_part_size; 710 gpt_entry *gpt_e; 711 int ret, i; 712 713 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte); 714 if (ret) 715 return ret; 716 717 gpt_e = *gpt_pte; 718 719 for (i = 0; i < parts; i++) { 720 if (i == gpt_head->num_partition_entries) { 721 pr_err("More partitions than allowed!\n"); 722 return -1; 723 } 724 725 /* Check if GPT and ENV partition names match */ 726 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name, 727 PARTNAME_SZ + 1); 728 729 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ", 730 __func__, i, efi_str, partitions[i].name); 731 732 if (strncmp(efi_str, (char *)partitions[i].name, 733 sizeof(partitions->name))) { 734 pr_err("Partition name: %s does not match %s!\n", 735 efi_str, (char *)partitions[i].name); 736 return -1; 737 } 738 739 /* Check if GPT and ENV sizes match */ 740 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) - 741 le64_to_cpu(gpt_e[i].starting_lba) + 1; 742 debug("size(LBA) - GPT: %8llu, ENV: %8llu ", 743 (unsigned long long)gpt_part_size, 744 (unsigned long long)partitions[i].size); 745 746 if (le64_to_cpu(gpt_part_size) != partitions[i].size) { 747 /* We do not check the extend partition size */ 748 if ((i == parts - 1) && (partitions[i].size == 0)) 749 continue; 750 751 pr_err("Partition %s size: %llu does not match %llu!\n", 752 efi_str, (unsigned long long)gpt_part_size, 753 (unsigned long long)partitions[i].size); 754 return -1; 755 } 756 757 /* 758 * Start address is optional - check only if provided 759 * in '$partition' variable 760 */ 761 if (!partitions[i].start) { 762 debug("\n"); 763 continue; 764 } 765 766 /* Check if GPT and ENV start LBAs match */ 767 debug("start LBA - GPT: %8llu, ENV: %8llu\n", 768 le64_to_cpu(gpt_e[i].starting_lba), 769 (unsigned long long)partitions[i].start); 770 771 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) { 772 pr_err("Partition %s start: %llu does not match %llu!\n", 773 efi_str, le64_to_cpu(gpt_e[i].starting_lba), 774 (unsigned long long)partitions[i].start); 775 return -1; 776 } 777 } 778 779 return 0; 780 } 781 782 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf) 783 { 784 gpt_header *gpt_h; 785 gpt_entry *gpt_e; 786 787 /* determine start of GPT Header in the buffer */ 788 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 789 dev_desc->blksz); 790 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA, 791 dev_desc->lba)) 792 return -1; 793 794 /* determine start of GPT Entries in the buffer */ 795 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 796 dev_desc->blksz); 797 if (validate_gpt_entries(gpt_h, gpt_e)) 798 return -1; 799 800 return 0; 801 } 802 803 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf) 804 { 805 gpt_header *gpt_h; 806 gpt_entry *gpt_e; 807 int gpt_e_blk_cnt; 808 lbaint_t lba; 809 int cnt; 810 811 if (is_valid_gpt_buf(dev_desc, buf)) 812 return -1; 813 814 /* determine start of GPT Header in the buffer */ 815 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 816 dev_desc->blksz); 817 818 /* determine start of GPT Entries in the buffer */ 819 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 820 dev_desc->blksz); 821 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) * 822 le32_to_cpu(gpt_h->sizeof_partition_entry)), 823 dev_desc); 824 825 /* write MBR */ 826 lba = 0; /* MBR is always at 0 */ 827 cnt = 1; /* MBR (1 block) */ 828 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) { 829 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 830 __func__, "MBR", cnt, lba); 831 return 1; 832 } 833 834 /* write Primary GPT */ 835 lba = GPT_PRIMARY_PARTITION_TABLE_LBA; 836 cnt = 1; /* GPT Header (1 block) */ 837 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 838 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 839 __func__, "Primary GPT Header", cnt, lba); 840 return 1; 841 } 842 843 lba = le64_to_cpu(gpt_h->partition_entry_lba); 844 cnt = gpt_e_blk_cnt; 845 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 846 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 847 __func__, "Primary GPT Entries", cnt, lba); 848 return 1; 849 } 850 851 prepare_backup_gpt_header(gpt_h); 852 853 /* write Backup GPT */ 854 lba = le64_to_cpu(gpt_h->partition_entry_lba); 855 cnt = gpt_e_blk_cnt; 856 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 857 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 858 __func__, "Backup GPT Entries", cnt, lba); 859 return 1; 860 } 861 862 lba = le64_to_cpu(gpt_h->my_lba); 863 cnt = 1; /* GPT Header (1 block) */ 864 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 865 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 866 __func__, "Backup GPT Header", cnt, lba); 867 return 1; 868 } 869 870 return 0; 871 } 872 #endif 873 874 /* 875 * Private functions 876 */ 877 /* 878 * pmbr_part_valid(): Check for EFI partition signature 879 * 880 * Returns: 1 if EFI GPT partition type is found. 881 */ 882 static int pmbr_part_valid(struct partition *part) 883 { 884 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 885 get_unaligned_le32(&part->start_sect) == 1UL) { 886 return 1; 887 } 888 889 return 0; 890 } 891 892 /* 893 * is_pmbr_valid(): test Protective MBR for validity 894 * 895 * Returns: 1 if PMBR is valid, 0 otherwise. 896 * Validity depends on two things: 897 * 1) MSDOS signature is in the last two bytes of the MBR 898 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 899 */ 900 static int is_pmbr_valid(legacy_mbr * mbr) 901 { 902 int i = 0; 903 904 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 905 return 0; 906 907 for (i = 0; i < 4; i++) { 908 if (pmbr_part_valid(&mbr->partition_record[i])) { 909 return 1; 910 } 911 } 912 return 0; 913 } 914 915 /** 916 * is_gpt_valid() - tests one GPT header and PTEs for validity 917 * 918 * lba is the logical block address of the GPT header to test 919 * gpt is a GPT header ptr, filled on return. 920 * ptes is a PTEs ptr, filled on return. 921 * 922 * Description: returns 1 if valid, 0 on error. 923 * If valid, returns pointers to PTEs. 924 */ 925 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, 926 gpt_header *pgpt_head, gpt_entry **pgpt_pte) 927 { 928 /* Confirm valid arguments prior to allocation. */ 929 if (!dev_desc || !pgpt_head) { 930 printf("%s: Invalid Argument(s)\n", __func__); 931 return 0; 932 } 933 934 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz); 935 936 /* Read MBR Header from device */ 937 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) { 938 printf("*** ERROR: Can't read MBR header ***\n"); 939 return 0; 940 } 941 942 /* Read GPT Header from device */ 943 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) { 944 printf("*** ERROR: Can't read GPT header ***\n"); 945 return 0; 946 } 947 948 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba)) 949 return 0; 950 951 if (dev_desc->sig_type == SIG_TYPE_NONE) { 952 efi_guid_t empty = {}; 953 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) { 954 dev_desc->sig_type = SIG_TYPE_GUID; 955 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid, 956 sizeof(empty)); 957 } else if (mbr->unique_mbr_signature != 0) { 958 dev_desc->sig_type = SIG_TYPE_MBR; 959 dev_desc->mbr_sig = mbr->unique_mbr_signature; 960 } 961 } 962 963 /* Read and allocate Partition Table Entries */ 964 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 965 if (*pgpt_pte == NULL) { 966 printf("GPT: Failed to allocate memory for PTE\n"); 967 return 0; 968 } 969 970 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) { 971 free(*pgpt_pte); 972 return 0; 973 } 974 975 /* We're done, all's well */ 976 return 1; 977 } 978 979 /** 980 * alloc_read_gpt_entries(): reads partition entries from disk 981 * @dev_desc 982 * @gpt - GPT header 983 * 984 * Description: Returns ptes on success, NULL on error. 985 * Allocates space for PTEs based on information found in @gpt. 986 * Notes: remember to free pte when you're done! 987 */ 988 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, 989 gpt_header *pgpt_head) 990 { 991 size_t count = 0, blk_cnt; 992 lbaint_t blk; 993 gpt_entry *pte = NULL; 994 995 if (!dev_desc || !pgpt_head) { 996 printf("%s: Invalid Argument(s)\n", __func__); 997 return NULL; 998 } 999 1000 count = le32_to_cpu(pgpt_head->num_partition_entries) * 1001 le32_to_cpu(pgpt_head->sizeof_partition_entry); 1002 1003 debug("%s: count = %u * %u = %lu\n", __func__, 1004 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 1005 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), 1006 (ulong)count); 1007 1008 /* Allocate memory for PTE, remember to FREE */ 1009 if (count != 0) { 1010 pte = memalign(ARCH_DMA_MINALIGN, 1011 PAD_TO_BLOCKSIZE(count, dev_desc)); 1012 } 1013 1014 if (count == 0 || pte == NULL) { 1015 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n", 1016 __func__, (ulong)count); 1017 return NULL; 1018 } 1019 1020 /* Read GPT Entries from device */ 1021 blk = le64_to_cpu(pgpt_head->partition_entry_lba); 1022 blk_cnt = BLOCK_CNT(count, dev_desc); 1023 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) { 1024 printf("*** ERROR: Can't read GPT Entries ***\n"); 1025 free(pte); 1026 return NULL; 1027 } 1028 return pte; 1029 } 1030 1031 /** 1032 * is_pte_valid(): validates a single Partition Table Entry 1033 * @gpt_entry - Pointer to a single Partition Table Entry 1034 * 1035 * Description: returns 1 if valid, 0 on error. 1036 */ 1037 static int is_pte_valid(gpt_entry * pte) 1038 { 1039 efi_guid_t unused_guid; 1040 1041 if (!pte) { 1042 printf("%s: Invalid Argument(s)\n", __func__); 1043 return 0; 1044 } 1045 1046 /* Only one validation for now: 1047 * The GUID Partition Type != Unused Entry (ALL-ZERO) 1048 */ 1049 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 1050 1051 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 1052 sizeof(unused_guid.b)) == 0) { 1053 1054 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 1055 (unsigned int)(uintptr_t)pte); 1056 1057 return 0; 1058 } else { 1059 return 1; 1060 } 1061 } 1062 1063 /* 1064 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to 1065 * check EFI first, since a DOS partition is often used as a 'protective MBR' 1066 * with EFI. 1067 */ 1068 U_BOOT_PART_TYPE(a_efi) = { 1069 .name = "EFI", 1070 .part_type = PART_TYPE_EFI, 1071 .max_entries = GPT_ENTRY_NUMBERS, 1072 .get_info = part_get_info_ptr(part_get_info_efi), 1073 .print = part_print_ptr(part_print_efi), 1074 .test = part_test_efi, 1075 }; 1076 #endif 1077