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 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 static gpt_entry *gpt_pte = NULL; 273 static gpt_header *gpt_head = NULL; 274 275 if (!gpt_head) 276 gpt_head = memalign(ARCH_DMA_MINALIGN, dev_desc->blksz); 277 278 /* 279 * We suppose different dev have different size, eg. emmc vs sd 280 * free the pte first if exist and then will malloc and init a new one. 281 */ 282 if (gpt_head && (gpt_head->last_usable_lba + 0x22) != dev_desc->lba) { 283 if (gpt_pte) 284 free(gpt_pte); 285 gpt_pte = NULL; 286 } 287 288 /* "part" argument must be at least 1 */ 289 if (part < 1) { 290 printf("%s: Invalid Argument(s)\n", __func__); 291 return -1; 292 } 293 294 /* This function validates AND fills in the GPT header and PTE */ 295 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 296 gpt_head, &gpt_pte) != 1) { 297 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 298 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 299 gpt_head, &gpt_pte) != 1) { 300 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 301 __func__); 302 return -1; 303 } else { 304 printf("%s: *** Using Backup GPT ***\n", 305 __func__); 306 } 307 } 308 309 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 310 !is_pte_valid(&gpt_pte[part - 1])) { 311 debug("%s: *** ERROR: Invalid partition number %d ***\n", 312 __func__, part); 313 return -1; 314 } 315 316 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ 317 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); 318 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 319 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 320 - info->start; 321 info->blksz = dev_desc->blksz; 322 323 sprintf((char *)info->name, "%s", 324 print_efiname(&gpt_pte[part - 1])); 325 strcpy((char *)info->type, "U-Boot"); 326 info->bootable = is_bootable(&gpt_pte[part - 1]); 327 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 328 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, 329 UUID_STR_FORMAT_GUID); 330 #endif 331 #ifdef CONFIG_PARTITION_TYPE_GUID 332 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b, 333 info->type_guid, UUID_STR_FORMAT_GUID); 334 #endif 335 336 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__, 337 info->start, info->size, info->name); 338 339 return 0; 340 } 341 342 static int part_test_efi(struct blk_desc *dev_desc) 343 { 344 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); 345 346 /* Read legacy MBR from block 0 and validate it */ 347 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1) 348 || (is_pmbr_valid(legacymbr) != 1)) { 349 return -1; 350 } 351 return 0; 352 } 353 354 /** 355 * set_protective_mbr(): Set the EFI protective MBR 356 * @param dev_desc - block device descriptor 357 * 358 * @return - zero on success, otherwise error 359 */ 360 static int set_protective_mbr(struct blk_desc *dev_desc) 361 { 362 /* Setup the Protective MBR */ 363 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1); 364 memset(p_mbr, 0, sizeof(*p_mbr)); 365 366 if (p_mbr == NULL) { 367 printf("%s: calloc failed!\n", __func__); 368 return -1; 369 } 370 371 /* Read MBR to backup boot code if it exists */ 372 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) { 373 pr_err("** Can't read from device %d **\n", dev_desc->devnum); 374 return -1; 375 } 376 377 /* Append signature */ 378 p_mbr->signature = MSDOS_MBR_SIGNATURE; 379 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; 380 p_mbr->partition_record[0].start_sect = 1; 381 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1; 382 383 /* Write MBR sector to the MMC device */ 384 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) { 385 printf("** Can't write to device %d **\n", 386 dev_desc->devnum); 387 return -1; 388 } 389 390 return 0; 391 } 392 393 int write_gpt_table(struct blk_desc *dev_desc, 394 gpt_header *gpt_h, gpt_entry *gpt_e) 395 { 396 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries 397 * sizeof(gpt_entry)), dev_desc); 398 u32 calc_crc32; 399 400 debug("max lba: %x\n", (u32) dev_desc->lba); 401 /* Setup the Protective MBR */ 402 if (set_protective_mbr(dev_desc) < 0) 403 goto err; 404 405 /* Generate CRC for the Primary GPT Header */ 406 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 407 le32_to_cpu(gpt_h->num_partition_entries) * 408 le32_to_cpu(gpt_h->sizeof_partition_entry)); 409 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); 410 411 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 412 le32_to_cpu(gpt_h->header_size)); 413 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 414 415 /* Write the First GPT to the block right after the Legacy MBR */ 416 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1) 417 goto err; 418 419 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba), 420 pte_blk_cnt, gpt_e) != pte_blk_cnt) 421 goto err; 422 423 prepare_backup_gpt_header(gpt_h); 424 425 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) 426 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt) 427 goto err; 428 429 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, 430 gpt_h) != 1) 431 goto err; 432 433 debug("GPT successfully written to block device!\n"); 434 return 0; 435 436 err: 437 printf("** Can't write to device %d **\n", dev_desc->devnum); 438 return -1; 439 } 440 441 int gpt_fill_pte(struct blk_desc *dev_desc, 442 gpt_header *gpt_h, gpt_entry *gpt_e, 443 disk_partition_t *partitions, int parts) 444 { 445 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); 446 lbaint_t last_usable_lba = (lbaint_t) 447 le64_to_cpu(gpt_h->last_usable_lba); 448 int i, k; 449 size_t efiname_len, dosname_len; 450 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 451 char *str_uuid; 452 unsigned char *bin_uuid; 453 #endif 454 #ifdef CONFIG_PARTITION_TYPE_GUID 455 char *str_type_guid; 456 unsigned char *bin_type_guid; 457 #endif 458 size_t hdr_start = gpt_h->my_lba; 459 size_t hdr_end = hdr_start + 1; 460 461 size_t pte_start = gpt_h->partition_entry_lba; 462 size_t pte_end = pte_start + 463 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry / 464 dev_desc->blksz; 465 466 for (i = 0; i < parts; i++) { 467 /* partition starting lba */ 468 lbaint_t start = partitions[i].start; 469 lbaint_t size = partitions[i].size; 470 471 if (start) { 472 offset = start + size; 473 } else { 474 start = offset; 475 offset += size; 476 } 477 478 /* 479 * If our partition overlaps with either the GPT 480 * header, or the partition entry, reject it. 481 */ 482 if (((start < hdr_end && hdr_start < (start + size)) || 483 (start < pte_end && pte_start < (start + size)))) { 484 printf("Partition overlap\n"); 485 return -1; 486 } 487 488 gpt_e[i].starting_lba = cpu_to_le64(start); 489 490 if (offset > (last_usable_lba + 1)) { 491 printf("Partitions layout exceds disk size\n"); 492 return -1; 493 } 494 /* partition ending lba */ 495 if ((i == parts - 1) && (size == 0)) 496 /* extend the last partition to maximuim */ 497 gpt_e[i].ending_lba = gpt_h->last_usable_lba; 498 else 499 gpt_e[i].ending_lba = cpu_to_le64(offset - 1); 500 501 #ifdef CONFIG_PARTITION_TYPE_GUID 502 str_type_guid = partitions[i].type_guid; 503 bin_type_guid = gpt_e[i].partition_type_guid.b; 504 if (strlen(str_type_guid)) { 505 if (uuid_str_to_bin(str_type_guid, bin_type_guid, 506 UUID_STR_FORMAT_GUID)) { 507 printf("Partition no. %d: invalid type guid: %s\n", 508 i, str_type_guid); 509 return -1; 510 } 511 } else { 512 /* default partition type GUID */ 513 memcpy(bin_type_guid, 514 &PARTITION_BASIC_DATA_GUID, 16); 515 } 516 #else 517 /* partition type GUID */ 518 memcpy(gpt_e[i].partition_type_guid.b, 519 &PARTITION_BASIC_DATA_GUID, 16); 520 #endif 521 522 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 523 str_uuid = partitions[i].uuid; 524 bin_uuid = gpt_e[i].unique_partition_guid.b; 525 526 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) { 527 printf("Partition no. %d: invalid guid: %s\n", 528 i, str_uuid); 529 return -1; 530 } 531 #endif 532 533 /* partition attributes */ 534 memset(&gpt_e[i].attributes, 0, 535 sizeof(gpt_entry_attributes)); 536 537 if (partitions[i].bootable) 538 gpt_e[i].attributes.fields.legacy_bios_bootable = 1; 539 540 /* partition name */ 541 efiname_len = sizeof(gpt_e[i].partition_name) 542 / sizeof(efi_char16_t); 543 dosname_len = sizeof(partitions[i].name); 544 545 memset(gpt_e[i].partition_name, 0, 546 sizeof(gpt_e[i].partition_name)); 547 548 for (k = 0; k < min(dosname_len, efiname_len); k++) 549 gpt_e[i].partition_name[k] = 550 (efi_char16_t)(partitions[i].name[k]); 551 552 debug("%s: name: %s offset[%d]: 0x" LBAF 553 " size[%d]: 0x" LBAF "\n", 554 __func__, partitions[i].name, i, 555 offset, i, size); 556 } 557 558 return 0; 559 } 560 561 static uint32_t partition_entries_offset(struct blk_desc *dev_desc) 562 { 563 uint32_t offset_blks = 2; 564 uint32_t __maybe_unused offset_bytes; 565 int __maybe_unused config_offset; 566 567 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF) 568 /* 569 * Some architectures require their SPL loader at a fixed 570 * address within the first 16KB of the disk. To avoid an 571 * overlap with the partition entries of the EFI partition 572 * table, the first safe offset (in bytes, from the start of 573 * the disk) for the entries can be set in 574 * CONFIG_EFI_PARTITION_ENTRIES_OFF. 575 */ 576 offset_bytes = 577 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc); 578 offset_blks = offset_bytes / dev_desc->blksz; 579 #endif 580 581 #if defined(CONFIG_OF_CONTROL) 582 /* 583 * Allow the offset of the first partition entires (in bytes 584 * from the start of the device) to be specified as a property 585 * of the device tree '/config' node. 586 */ 587 config_offset = fdtdec_get_config_int(gd->fdt_blob, 588 "u-boot,efi-partition-entries-offset", 589 -EINVAL); 590 if (config_offset != -EINVAL) { 591 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc); 592 offset_blks = offset_bytes / dev_desc->blksz; 593 } 594 #endif 595 596 debug("efi: partition entries offset (in blocks): %d\n", offset_blks); 597 598 /* 599 * The earliest LBA this can be at is LBA#2 (i.e. right behind 600 * the (protective) MBR and the GPT header. 601 */ 602 if (offset_blks < 2) 603 offset_blks = 2; 604 605 return offset_blks; 606 } 607 608 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, 609 char *str_guid, int parts_count) 610 { 611 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); 612 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); 613 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); 614 gpt_h->my_lba = cpu_to_le64(1); 615 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); 616 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); 617 gpt_h->partition_entry_lba = 618 cpu_to_le64(partition_entries_offset(dev_desc)); 619 gpt_h->first_usable_lba = 620 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32); 621 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); 622 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); 623 gpt_h->header_crc32 = 0; 624 gpt_h->partition_entry_array_crc32 = 0; 625 626 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) 627 return -1; 628 629 return 0; 630 } 631 632 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid, 633 disk_partition_t *partitions, int parts_count) 634 { 635 gpt_header *gpt_h; 636 gpt_entry *gpt_e; 637 int ret, size; 638 639 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc); 640 gpt_h = malloc_cache_aligned(size); 641 if (gpt_h == NULL) { 642 printf("%s: calloc failed!\n", __func__); 643 return -1; 644 } 645 memset(gpt_h, 0, size); 646 647 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry), 648 dev_desc); 649 gpt_e = malloc_cache_aligned(size); 650 if (gpt_e == NULL) { 651 printf("%s: calloc failed!\n", __func__); 652 free(gpt_h); 653 return -1; 654 } 655 memset(gpt_e, 0, size); 656 657 /* Generate Primary GPT header (LBA1) */ 658 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); 659 if (ret) 660 goto err; 661 662 /* Generate partition entries */ 663 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count); 664 if (ret) 665 goto err; 666 667 /* Write GPT partition table */ 668 ret = write_gpt_table(dev_desc, gpt_h, gpt_e); 669 670 err: 671 free(gpt_e); 672 free(gpt_h); 673 return ret; 674 } 675 676 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n) 677 { 678 char *ess = (char *)es; 679 int i, j; 680 681 memset(s, '\0', n); 682 683 for (i = 0, j = 0; j < n; i += 2, j++) { 684 s[j] = ess[i]; 685 if (!ess[i]) 686 return; 687 } 688 } 689 690 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head, 691 gpt_entry **gpt_pte) 692 { 693 /* 694 * This function validates AND 695 * fills in the GPT header and PTE 696 */ 697 if (is_gpt_valid(dev_desc, 698 GPT_PRIMARY_PARTITION_TABLE_LBA, 699 gpt_head, gpt_pte) != 1) { 700 printf("%s: *** ERROR: Invalid GPT ***\n", 701 __func__); 702 return -1; 703 } 704 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 705 gpt_head, gpt_pte) != 1) { 706 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 707 __func__); 708 return -1; 709 } 710 711 return 0; 712 } 713 714 int gpt_verify_partitions(struct blk_desc *dev_desc, 715 disk_partition_t *partitions, int parts, 716 gpt_header *gpt_head, gpt_entry **gpt_pte) 717 { 718 char efi_str[PARTNAME_SZ + 1]; 719 u64 gpt_part_size; 720 gpt_entry *gpt_e; 721 int ret, i; 722 723 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte); 724 if (ret) 725 return ret; 726 727 gpt_e = *gpt_pte; 728 729 for (i = 0; i < parts; i++) { 730 if (i == gpt_head->num_partition_entries) { 731 pr_err("More partitions than allowed!\n"); 732 return -1; 733 } 734 735 /* Check if GPT and ENV partition names match */ 736 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name, 737 PARTNAME_SZ + 1); 738 739 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ", 740 __func__, i, efi_str, partitions[i].name); 741 742 if (strncmp(efi_str, (char *)partitions[i].name, 743 sizeof(partitions->name))) { 744 pr_err("Partition name: %s does not match %s!\n", 745 efi_str, (char *)partitions[i].name); 746 return -1; 747 } 748 749 /* Check if GPT and ENV sizes match */ 750 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) - 751 le64_to_cpu(gpt_e[i].starting_lba) + 1; 752 debug("size(LBA) - GPT: %8llu, ENV: %8llu ", 753 (unsigned long long)gpt_part_size, 754 (unsigned long long)partitions[i].size); 755 756 if (le64_to_cpu(gpt_part_size) != partitions[i].size) { 757 /* We do not check the extend partition size */ 758 if ((i == parts - 1) && (partitions[i].size == 0)) 759 continue; 760 761 pr_err("Partition %s size: %llu does not match %llu!\n", 762 efi_str, (unsigned long long)gpt_part_size, 763 (unsigned long long)partitions[i].size); 764 return -1; 765 } 766 767 /* 768 * Start address is optional - check only if provided 769 * in '$partition' variable 770 */ 771 if (!partitions[i].start) { 772 debug("\n"); 773 continue; 774 } 775 776 /* Check if GPT and ENV start LBAs match */ 777 debug("start LBA - GPT: %8llu, ENV: %8llu\n", 778 le64_to_cpu(gpt_e[i].starting_lba), 779 (unsigned long long)partitions[i].start); 780 781 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) { 782 pr_err("Partition %s start: %llu does not match %llu!\n", 783 efi_str, le64_to_cpu(gpt_e[i].starting_lba), 784 (unsigned long long)partitions[i].start); 785 return -1; 786 } 787 } 788 789 return 0; 790 } 791 792 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf) 793 { 794 gpt_header *gpt_h; 795 gpt_entry *gpt_e; 796 797 /* determine start of GPT Header in the buffer */ 798 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 799 dev_desc->blksz); 800 801 if ((le64_to_cpu(gpt_h->alternate_lba) + 1) 802 != cpu_to_le64(dev_desc->lba)) { 803 printf("%s: failed checking '%s'\n", __func__, 804 "invalid GPT Disk Size"); 805 return -1; 806 } 807 808 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA, 809 dev_desc->lba)) 810 return -1; 811 812 /* determine start of GPT Entries in the buffer */ 813 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 814 dev_desc->blksz); 815 if (validate_gpt_entries(gpt_h, gpt_e)) 816 return -1; 817 818 return 0; 819 } 820 821 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf) 822 { 823 gpt_header *gpt_h; 824 gpt_entry *gpt_e; 825 int gpt_e_blk_cnt; 826 lbaint_t lba; 827 int cnt; 828 829 if (is_valid_gpt_buf(dev_desc, buf)) 830 return -1; 831 832 /* determine start of GPT Header in the buffer */ 833 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 834 dev_desc->blksz); 835 836 /* determine start of GPT Entries in the buffer */ 837 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 838 dev_desc->blksz); 839 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) * 840 le32_to_cpu(gpt_h->sizeof_partition_entry)), 841 dev_desc); 842 843 /* write MBR */ 844 lba = 0; /* MBR is always at 0 */ 845 cnt = 1; /* MBR (1 block) */ 846 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) { 847 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 848 __func__, "MBR", cnt, lba); 849 return 1; 850 } 851 852 /* write Primary GPT */ 853 lba = GPT_PRIMARY_PARTITION_TABLE_LBA; 854 cnt = 1; /* GPT Header (1 block) */ 855 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 856 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 857 __func__, "Primary GPT Header", cnt, lba); 858 return 1; 859 } 860 861 lba = le64_to_cpu(gpt_h->partition_entry_lba); 862 cnt = gpt_e_blk_cnt; 863 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 864 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 865 __func__, "Primary GPT Entries", cnt, lba); 866 return 1; 867 } 868 869 prepare_backup_gpt_header(gpt_h); 870 871 /* write Backup GPT */ 872 lba = le64_to_cpu(gpt_h->partition_entry_lba); 873 cnt = gpt_e_blk_cnt; 874 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 875 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 876 __func__, "Backup GPT Entries", cnt, lba); 877 return 1; 878 } 879 880 lba = le64_to_cpu(gpt_h->my_lba); 881 cnt = 1; /* GPT Header (1 block) */ 882 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 883 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 884 __func__, "Backup GPT Header", cnt, lba); 885 return 1; 886 } 887 888 return 0; 889 } 890 #endif 891 892 /* 893 * Private functions 894 */ 895 /* 896 * pmbr_part_valid(): Check for EFI partition signature 897 * 898 * Returns: 1 if EFI GPT partition type is found. 899 */ 900 static int pmbr_part_valid(struct partition *part) 901 { 902 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 903 get_unaligned_le32(&part->start_sect) == 1UL) { 904 return 1; 905 } 906 907 return 0; 908 } 909 910 /* 911 * is_pmbr_valid(): test Protective MBR for validity 912 * 913 * Returns: 1 if PMBR is valid, 0 otherwise. 914 * Validity depends on two things: 915 * 1) MSDOS signature is in the last two bytes of the MBR 916 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 917 */ 918 static int is_pmbr_valid(legacy_mbr * mbr) 919 { 920 int i = 0; 921 922 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 923 return 0; 924 925 for (i = 0; i < 4; i++) { 926 if (pmbr_part_valid(&mbr->partition_record[i])) { 927 return 1; 928 } 929 } 930 return 0; 931 } 932 933 /** 934 * is_gpt_valid() - tests one GPT header and PTEs for validity 935 * 936 * lba is the logical block address of the GPT header to test 937 * gpt is a GPT header ptr, filled on return. 938 * ptes is a PTEs ptr, filled on return. 939 * 940 * Description: returns 1 if valid, 0 on error. 941 * If valid, returns pointers to PTEs. 942 */ 943 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, 944 gpt_header *pgpt_head, gpt_entry **pgpt_pte) 945 { 946 /* Confirm valid arguments prior to allocation. */ 947 if (!dev_desc || !pgpt_head) { 948 printf("%s: Invalid Argument(s)\n", __func__); 949 return 0; 950 } 951 952 /* Re-use pte if it's not NULL */ 953 if (*pgpt_pte) 954 return 1; 955 956 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz); 957 958 /* Read MBR Header from device */ 959 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) { 960 printf("*** ERROR: Can't read MBR header ***\n"); 961 return 0; 962 } 963 964 /* Read GPT Header from device */ 965 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) { 966 printf("*** ERROR: Can't read GPT header ***\n"); 967 return 0; 968 } 969 970 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba)) 971 return 0; 972 973 if (dev_desc->sig_type == SIG_TYPE_NONE) { 974 efi_guid_t empty = {}; 975 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) { 976 dev_desc->sig_type = SIG_TYPE_GUID; 977 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid, 978 sizeof(empty)); 979 } else if (mbr->unique_mbr_signature != 0) { 980 dev_desc->sig_type = SIG_TYPE_MBR; 981 dev_desc->mbr_sig = mbr->unique_mbr_signature; 982 } 983 } 984 985 /* Read and allocate Partition Table Entries */ 986 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 987 if (*pgpt_pte == NULL) { 988 printf("GPT: Failed to allocate memory for PTE\n"); 989 return 0; 990 } 991 992 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) { 993 free(*pgpt_pte); 994 *pgpt_pte = NULL; 995 return 0; 996 } 997 998 /* We're done, all's well */ 999 return 1; 1000 } 1001 1002 /** 1003 * alloc_read_gpt_entries(): reads partition entries from disk 1004 * @dev_desc 1005 * @gpt - GPT header 1006 * 1007 * Description: Returns ptes on success, NULL on error. 1008 * Allocates space for PTEs based on information found in @gpt. 1009 * Notes: remember to free pte when you're done! 1010 */ 1011 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, 1012 gpt_header *pgpt_head) 1013 { 1014 size_t count = 0, blk_cnt; 1015 lbaint_t blk; 1016 gpt_entry *pte = NULL; 1017 1018 if (!dev_desc || !pgpt_head) { 1019 printf("%s: Invalid Argument(s)\n", __func__); 1020 return NULL; 1021 } 1022 1023 count = le32_to_cpu(pgpt_head->num_partition_entries) * 1024 le32_to_cpu(pgpt_head->sizeof_partition_entry); 1025 1026 debug("%s: count = %u * %u = %lu\n", __func__, 1027 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 1028 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), 1029 (ulong)count); 1030 1031 /* Allocate memory for PTE, remember to FREE */ 1032 if (count != 0) { 1033 pte = memalign(ARCH_DMA_MINALIGN, 1034 PAD_TO_BLOCKSIZE(count, dev_desc)); 1035 } 1036 1037 if (count == 0 || pte == NULL) { 1038 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n", 1039 __func__, (ulong)count); 1040 return NULL; 1041 } 1042 1043 /* Read GPT Entries from device */ 1044 blk = le64_to_cpu(pgpt_head->partition_entry_lba); 1045 blk_cnt = BLOCK_CNT(count, dev_desc); 1046 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) { 1047 printf("*** ERROR: Can't read GPT Entries ***\n"); 1048 free(pte); 1049 return NULL; 1050 } 1051 return pte; 1052 } 1053 1054 /** 1055 * is_pte_valid(): validates a single Partition Table Entry 1056 * @gpt_entry - Pointer to a single Partition Table Entry 1057 * 1058 * Description: returns 1 if valid, 0 on error. 1059 */ 1060 static int is_pte_valid(gpt_entry * pte) 1061 { 1062 efi_guid_t unused_guid; 1063 1064 if (!pte) { 1065 printf("%s: Invalid Argument(s)\n", __func__); 1066 return 0; 1067 } 1068 1069 /* Only one validation for now: 1070 * The GUID Partition Type != Unused Entry (ALL-ZERO) 1071 */ 1072 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 1073 1074 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 1075 sizeof(unused_guid.b)) == 0) { 1076 1077 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 1078 (unsigned int)(uintptr_t)pte); 1079 1080 return 0; 1081 } else { 1082 return 1; 1083 } 1084 } 1085 1086 /* 1087 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to 1088 * check EFI first, since a DOS partition is often used as a 'protective MBR' 1089 * with EFI. 1090 */ 1091 U_BOOT_PART_TYPE(a_efi) = { 1092 .name = "EFI", 1093 .part_type = PART_TYPE_EFI, 1094 .max_entries = GPT_ENTRY_NUMBERS, 1095 .get_info = part_get_info_ptr(part_get_info_efi), 1096 .print = part_print_ptr(part_print_efi), 1097 .test = part_test_efi, 1098 }; 1099 #endif 1100