1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2008 RuggedCom, Inc. 4 * Richard Retanubun <RichardRetanubun@RuggedCom.com> 5 */ 6 7 /* 8 * NOTE: 9 * when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this 10 * limits the maximum size of addressable storage to < 2 Terra Bytes 11 */ 12 #include <asm/unaligned.h> 13 #include <common.h> 14 #include <command.h> 15 #include <fdtdec.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/compiler.h> 22 #include <linux/ctype.h> 23 24 DECLARE_GLOBAL_DATA_PTR; 25 26 #ifdef CONFIG_HAVE_BLOCK_DEVICE 27 /** 28 * efi_crc32() - EFI version of crc32 function 29 * @buf: buffer to calculate crc32 of 30 * @len - length of buf 31 * 32 * Description: Returns EFI-style CRC32 value for @buf 33 */ 34 static inline u32 efi_crc32(const void *buf, u32 len) 35 { 36 return crc32(0, buf, len); 37 } 38 39 /* 40 * Private function prototypes 41 */ 42 43 static int pmbr_part_valid(struct partition *part); 44 static int is_pmbr_valid(legacy_mbr * mbr); 45 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, 46 gpt_header *pgpt_head, gpt_entry **pgpt_pte); 47 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, 48 gpt_header *pgpt_head); 49 static int is_pte_valid(gpt_entry * pte); 50 51 static char *print_efiname(gpt_entry *pte) 52 { 53 static char name[PARTNAME_SZ + 1]; 54 int i; 55 for (i = 0; i < PARTNAME_SZ; i++) { 56 u8 c; 57 c = pte->partition_name[i] & 0xff; 58 c = (c && !isprint(c)) ? '.' : c; 59 name[i] = c; 60 } 61 name[PARTNAME_SZ] = 0; 62 return name; 63 } 64 65 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; 66 67 static inline int is_bootable(gpt_entry *p) 68 { 69 return p->attributes.fields.legacy_bios_bootable || 70 !memcmp(&(p->partition_type_guid), &system_guid, 71 sizeof(efi_guid_t)); 72 } 73 74 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba, 75 lbaint_t lastlba) 76 { 77 uint32_t crc32_backup = 0; 78 uint32_t calc_crc32; 79 80 /* Check the GPT header signature */ 81 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) { 82 printf("%s signature is wrong: 0x%llX != 0x%llX\n", 83 "GUID Partition Table Header", 84 le64_to_cpu(gpt_h->signature), 85 GPT_HEADER_SIGNATURE); 86 return -1; 87 } 88 89 /* Check the GUID Partition Table CRC */ 90 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup)); 91 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32)); 92 93 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 94 le32_to_cpu(gpt_h->header_size)); 95 96 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup)); 97 98 if (calc_crc32 != le32_to_cpu(crc32_backup)) { 99 printf("%s CRC is wrong: 0x%x != 0x%x\n", 100 "GUID Partition Table Header", 101 le32_to_cpu(crc32_backup), calc_crc32); 102 return -1; 103 } 104 105 /* 106 * Check that the my_lba entry points to the LBA that contains the GPT 107 */ 108 if (le64_to_cpu(gpt_h->my_lba) != lba) { 109 printf("GPT: my_lba incorrect: %llX != " LBAF "\n", 110 le64_to_cpu(gpt_h->my_lba), 111 lba); 112 return -1; 113 } 114 115 /* 116 * Check that the first_usable_lba and that the last_usable_lba are 117 * within the disk. 118 */ 119 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) { 120 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n", 121 le64_to_cpu(gpt_h->first_usable_lba), lastlba); 122 return -1; 123 } 124 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) { 125 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n", 126 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 127 return -1; 128 } 129 130 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: " 131 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba), 132 le64_to_cpu(gpt_h->last_usable_lba), lastlba); 133 134 return 0; 135 } 136 137 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e) 138 { 139 uint32_t calc_crc32; 140 141 /* Check the GUID Partition Table Entry Array CRC */ 142 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 143 le32_to_cpu(gpt_h->num_partition_entries) * 144 le32_to_cpu(gpt_h->sizeof_partition_entry)); 145 146 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) { 147 printf("%s: 0x%x != 0x%x\n", 148 "GUID Partition Table Entry Array CRC is wrong", 149 le32_to_cpu(gpt_h->partition_entry_array_crc32), 150 calc_crc32); 151 return -1; 152 } 153 154 return 0; 155 } 156 157 static void prepare_backup_gpt_header(gpt_header *gpt_h) 158 { 159 uint32_t calc_crc32; 160 uint64_t val; 161 162 /* recalculate the values for the Backup GPT Header */ 163 val = le64_to_cpu(gpt_h->my_lba); 164 gpt_h->my_lba = gpt_h->alternate_lba; 165 gpt_h->alternate_lba = cpu_to_le64(val); 166 gpt_h->partition_entry_lba = 167 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1); 168 gpt_h->header_crc32 = 0; 169 170 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 171 le32_to_cpu(gpt_h->header_size)); 172 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 173 } 174 175 #if CONFIG_IS_ENABLED(EFI_PARTITION) 176 /* 177 * Public Functions (include/part.h) 178 */ 179 180 /* 181 * UUID is displayed as 32 hexadecimal digits, in 5 groups, 182 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters 183 */ 184 int get_disk_guid(struct blk_desc * dev_desc, char *guid) 185 { 186 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 187 gpt_entry *gpt_pte = NULL; 188 unsigned char *guid_bin; 189 190 /* This function validates AND fills in the GPT header and PTE */ 191 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 192 gpt_head, &gpt_pte) != 1) { 193 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 194 if (is_gpt_valid(dev_desc, dev_desc->lba - 1, 195 gpt_head, &gpt_pte) != 1) { 196 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 197 __func__); 198 return -EINVAL; 199 } else { 200 printf("%s: *** Using Backup GPT ***\n", 201 __func__); 202 } 203 } 204 205 guid_bin = gpt_head->disk_guid.b; 206 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID); 207 208 return 0; 209 } 210 211 void part_print_efi(struct blk_desc *dev_desc) 212 { 213 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 214 gpt_entry *gpt_pte = NULL; 215 int i = 0; 216 char uuid[UUID_STR_LEN + 1]; 217 unsigned char *uuid_bin; 218 219 /* This function validates AND fills in the GPT header and PTE */ 220 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 221 gpt_head, &gpt_pte) != 1) { 222 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 223 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 224 gpt_head, &gpt_pte) != 1) { 225 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 226 __func__); 227 return; 228 } else { 229 printf("%s: *** Using Backup GPT ***\n", 230 __func__); 231 } 232 } 233 234 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 235 236 printf("Part\tStart LBA\tEnd LBA\t\tName\n"); 237 printf("\tAttributes\n"); 238 printf("\tType GUID\n"); 239 printf("\tPartition GUID\n"); 240 241 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { 242 /* Stop at the first non valid PTE */ 243 if (!is_pte_valid(&gpt_pte[i])) 244 break; 245 246 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), 247 le64_to_cpu(gpt_pte[i].starting_lba), 248 le64_to_cpu(gpt_pte[i].ending_lba), 249 print_efiname(&gpt_pte[i])); 250 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); 251 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; 252 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 253 printf("\ttype:\t%s\n", uuid); 254 #ifdef CONFIG_PARTITION_TYPE_GUID 255 if (!uuid_guid_get_str(uuid_bin, uuid)) 256 printf("\ttype:\t%s\n", uuid); 257 #endif 258 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; 259 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); 260 printf("\tguid:\t%s\n", uuid); 261 } 262 263 /* Remember to free pte */ 264 free(gpt_pte); 265 return; 266 } 267 268 int part_get_info_efi(struct blk_desc *dev_desc, int part, 269 disk_partition_t *info) 270 { 271 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); 272 gpt_entry *gpt_pte = NULL; 273 274 /* "part" argument must be at least 1 */ 275 if (part < 1) { 276 printf("%s: Invalid Argument(s)\n", __func__); 277 return -1; 278 } 279 280 /* This function validates AND fills in the GPT header and PTE */ 281 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 282 gpt_head, &gpt_pte) != 1) { 283 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 284 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 285 gpt_head, &gpt_pte) != 1) { 286 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 287 __func__); 288 return -1; 289 } else { 290 printf("%s: *** Using Backup GPT ***\n", 291 __func__); 292 } 293 } 294 295 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 296 !is_pte_valid(&gpt_pte[part - 1])) { 297 debug("%s: *** ERROR: Invalid partition number %d ***\n", 298 __func__, part); 299 free(gpt_pte); 300 return -1; 301 } 302 303 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ 304 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); 305 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 306 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 307 - info->start; 308 info->blksz = dev_desc->blksz; 309 310 sprintf((char *)info->name, "%s", 311 print_efiname(&gpt_pte[part - 1])); 312 strcpy((char *)info->type, "U-Boot"); 313 info->bootable = is_bootable(&gpt_pte[part - 1]); 314 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 315 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, 316 UUID_STR_FORMAT_GUID); 317 #endif 318 #ifdef CONFIG_PARTITION_TYPE_GUID 319 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b, 320 info->type_guid, UUID_STR_FORMAT_GUID); 321 #endif 322 323 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__, 324 info->start, info->size, info->name); 325 326 /* Remember to free pte */ 327 free(gpt_pte); 328 return 0; 329 } 330 331 static int part_test_efi(struct blk_desc *dev_desc) 332 { 333 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); 334 335 /* Read legacy MBR from block 0 and validate it */ 336 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1) 337 || (is_pmbr_valid(legacymbr) != 1)) { 338 return -1; 339 } 340 return 0; 341 } 342 343 /** 344 * set_protective_mbr(): Set the EFI protective MBR 345 * @param dev_desc - block device descriptor 346 * 347 * @return - zero on success, otherwise error 348 */ 349 static int set_protective_mbr(struct blk_desc *dev_desc) 350 { 351 /* Setup the Protective MBR */ 352 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz); 353 if (p_mbr == NULL) { 354 printf("%s: calloc failed!\n", __func__); 355 return -1; 356 } 357 358 /* Read MBR to backup boot code if it exists */ 359 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) { 360 pr_err("** Can't read from device %d **\n", dev_desc->devnum); 361 return -1; 362 } 363 364 /* Clear all data in MBR except of backed up boot code */ 365 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) - 366 MSDOS_MBR_BOOT_CODE_SIZE); 367 368 /* Append signature */ 369 p_mbr->signature = MSDOS_MBR_SIGNATURE; 370 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; 371 p_mbr->partition_record[0].start_sect = 1; 372 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1; 373 374 /* Write MBR sector to the MMC device */ 375 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) { 376 printf("** Can't write to device %d **\n", 377 dev_desc->devnum); 378 return -1; 379 } 380 381 return 0; 382 } 383 384 int write_gpt_table(struct blk_desc *dev_desc, 385 gpt_header *gpt_h, gpt_entry *gpt_e) 386 { 387 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries 388 * sizeof(gpt_entry)), dev_desc); 389 u32 calc_crc32; 390 391 debug("max lba: %x\n", (u32) dev_desc->lba); 392 /* Setup the Protective MBR */ 393 if (set_protective_mbr(dev_desc) < 0) 394 goto err; 395 396 /* Generate CRC for the Primary GPT Header */ 397 calc_crc32 = efi_crc32((const unsigned char *)gpt_e, 398 le32_to_cpu(gpt_h->num_partition_entries) * 399 le32_to_cpu(gpt_h->sizeof_partition_entry)); 400 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); 401 402 calc_crc32 = efi_crc32((const unsigned char *)gpt_h, 403 le32_to_cpu(gpt_h->header_size)); 404 gpt_h->header_crc32 = cpu_to_le32(calc_crc32); 405 406 /* Write the First GPT to the block right after the Legacy MBR */ 407 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1) 408 goto err; 409 410 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba), 411 pte_blk_cnt, gpt_e) != pte_blk_cnt) 412 goto err; 413 414 prepare_backup_gpt_header(gpt_h); 415 416 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) 417 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt) 418 goto err; 419 420 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, 421 gpt_h) != 1) 422 goto err; 423 424 debug("GPT successfully written to block device!\n"); 425 return 0; 426 427 err: 428 printf("** Can't write to device %d **\n", dev_desc->devnum); 429 return -1; 430 } 431 432 int gpt_fill_pte(struct blk_desc *dev_desc, 433 gpt_header *gpt_h, gpt_entry *gpt_e, 434 disk_partition_t *partitions, int parts) 435 { 436 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); 437 lbaint_t last_usable_lba = (lbaint_t) 438 le64_to_cpu(gpt_h->last_usable_lba); 439 int i, k; 440 size_t efiname_len, dosname_len; 441 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 442 char *str_uuid; 443 unsigned char *bin_uuid; 444 #endif 445 #ifdef CONFIG_PARTITION_TYPE_GUID 446 char *str_type_guid; 447 unsigned char *bin_type_guid; 448 #endif 449 size_t hdr_start = gpt_h->my_lba; 450 size_t hdr_end = hdr_start + 1; 451 452 size_t pte_start = gpt_h->partition_entry_lba; 453 size_t pte_end = pte_start + 454 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry / 455 dev_desc->blksz; 456 457 for (i = 0; i < parts; i++) { 458 /* partition starting lba */ 459 lbaint_t start = partitions[i].start; 460 lbaint_t size = partitions[i].size; 461 462 if (start) { 463 offset = start + size; 464 } else { 465 start = offset; 466 offset += size; 467 } 468 469 /* 470 * If our partition overlaps with either the GPT 471 * header, or the partition entry, reject it. 472 */ 473 if (((start < hdr_end && hdr_start < (start + size)) || 474 (start < pte_end && pte_start < (start + size)))) { 475 printf("Partition overlap\n"); 476 return -1; 477 } 478 479 gpt_e[i].starting_lba = cpu_to_le64(start); 480 481 if (offset > (last_usable_lba + 1)) { 482 printf("Partitions layout exceds disk size\n"); 483 return -1; 484 } 485 /* partition ending lba */ 486 if ((i == parts - 1) && (size == 0)) 487 /* extend the last partition to maximuim */ 488 gpt_e[i].ending_lba = gpt_h->last_usable_lba; 489 else 490 gpt_e[i].ending_lba = cpu_to_le64(offset - 1); 491 492 #ifdef CONFIG_PARTITION_TYPE_GUID 493 str_type_guid = partitions[i].type_guid; 494 bin_type_guid = gpt_e[i].partition_type_guid.b; 495 if (strlen(str_type_guid)) { 496 if (uuid_str_to_bin(str_type_guid, bin_type_guid, 497 UUID_STR_FORMAT_GUID)) { 498 printf("Partition no. %d: invalid type guid: %s\n", 499 i, str_type_guid); 500 return -1; 501 } 502 } else { 503 /* default partition type GUID */ 504 memcpy(bin_type_guid, 505 &PARTITION_BASIC_DATA_GUID, 16); 506 } 507 #else 508 /* partition type GUID */ 509 memcpy(gpt_e[i].partition_type_guid.b, 510 &PARTITION_BASIC_DATA_GUID, 16); 511 #endif 512 513 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 514 str_uuid = partitions[i].uuid; 515 bin_uuid = gpt_e[i].unique_partition_guid.b; 516 517 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) { 518 printf("Partition no. %d: invalid guid: %s\n", 519 i, str_uuid); 520 return -1; 521 } 522 #endif 523 524 /* partition attributes */ 525 memset(&gpt_e[i].attributes, 0, 526 sizeof(gpt_entry_attributes)); 527 528 if (partitions[i].bootable) 529 gpt_e[i].attributes.fields.legacy_bios_bootable = 1; 530 531 /* partition name */ 532 efiname_len = sizeof(gpt_e[i].partition_name) 533 / sizeof(efi_char16_t); 534 dosname_len = sizeof(partitions[i].name); 535 536 memset(gpt_e[i].partition_name, 0, 537 sizeof(gpt_e[i].partition_name)); 538 539 for (k = 0; k < min(dosname_len, efiname_len); k++) 540 gpt_e[i].partition_name[k] = 541 (efi_char16_t)(partitions[i].name[k]); 542 543 debug("%s: name: %s offset[%d]: 0x" LBAF 544 " size[%d]: 0x" LBAF "\n", 545 __func__, partitions[i].name, i, 546 offset, i, size); 547 } 548 549 return 0; 550 } 551 552 static uint32_t partition_entries_offset(struct blk_desc *dev_desc) 553 { 554 uint32_t offset_blks = 2; 555 uint32_t __maybe_unused offset_bytes; 556 int __maybe_unused config_offset; 557 558 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF) 559 /* 560 * Some architectures require their SPL loader at a fixed 561 * address within the first 16KB of the disk. To avoid an 562 * overlap with the partition entries of the EFI partition 563 * table, the first safe offset (in bytes, from the start of 564 * the disk) for the entries can be set in 565 * CONFIG_EFI_PARTITION_ENTRIES_OFF. 566 */ 567 offset_bytes = 568 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc); 569 offset_blks = offset_bytes / dev_desc->blksz; 570 #endif 571 572 #if defined(CONFIG_OF_CONTROL) 573 /* 574 * Allow the offset of the first partition entires (in bytes 575 * from the start of the device) to be specified as a property 576 * of the device tree '/config' node. 577 */ 578 config_offset = fdtdec_get_config_int(gd->fdt_blob, 579 "u-boot,efi-partition-entries-offset", 580 -EINVAL); 581 if (config_offset != -EINVAL) { 582 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc); 583 offset_blks = offset_bytes / dev_desc->blksz; 584 } 585 #endif 586 587 debug("efi: partition entries offset (in blocks): %d\n", offset_blks); 588 589 /* 590 * The earliest LBA this can be at is LBA#2 (i.e. right behind 591 * the (protective) MBR and the GPT header. 592 */ 593 if (offset_blks < 2) 594 offset_blks = 2; 595 596 return offset_blks; 597 } 598 599 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, 600 char *str_guid, int parts_count) 601 { 602 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); 603 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); 604 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); 605 gpt_h->my_lba = cpu_to_le64(1); 606 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); 607 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); 608 gpt_h->partition_entry_lba = 609 cpu_to_le64(partition_entries_offset(dev_desc)); 610 gpt_h->first_usable_lba = 611 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32); 612 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); 613 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); 614 gpt_h->header_crc32 = 0; 615 gpt_h->partition_entry_array_crc32 = 0; 616 617 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) 618 return -1; 619 620 return 0; 621 } 622 623 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid, 624 disk_partition_t *partitions, int parts_count) 625 { 626 gpt_header *gpt_h; 627 gpt_entry *gpt_e; 628 int ret, size; 629 630 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc); 631 gpt_h = malloc_cache_aligned(size); 632 if (gpt_h == NULL) { 633 printf("%s: calloc failed!\n", __func__); 634 return -1; 635 } 636 memset(gpt_h, 0, size); 637 638 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry), 639 dev_desc); 640 gpt_e = malloc_cache_aligned(size); 641 if (gpt_e == NULL) { 642 printf("%s: calloc failed!\n", __func__); 643 free(gpt_h); 644 return -1; 645 } 646 memset(gpt_e, 0, size); 647 648 /* Generate Primary GPT header (LBA1) */ 649 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); 650 if (ret) 651 goto err; 652 653 /* Generate partition entries */ 654 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count); 655 if (ret) 656 goto err; 657 658 /* Write GPT partition table */ 659 ret = write_gpt_table(dev_desc, gpt_h, gpt_e); 660 661 err: 662 free(gpt_e); 663 free(gpt_h); 664 return ret; 665 } 666 667 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n) 668 { 669 char *ess = (char *)es; 670 int i, j; 671 672 memset(s, '\0', n); 673 674 for (i = 0, j = 0; j < n; i += 2, j++) { 675 s[j] = ess[i]; 676 if (!ess[i]) 677 return; 678 } 679 } 680 681 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head, 682 gpt_entry **gpt_pte) 683 { 684 /* 685 * This function validates AND 686 * fills in the GPT header and PTE 687 */ 688 if (is_gpt_valid(dev_desc, 689 GPT_PRIMARY_PARTITION_TABLE_LBA, 690 gpt_head, gpt_pte) != 1) { 691 printf("%s: *** ERROR: Invalid GPT ***\n", 692 __func__); 693 return -1; 694 } 695 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), 696 gpt_head, gpt_pte) != 1) { 697 printf("%s: *** ERROR: Invalid Backup GPT ***\n", 698 __func__); 699 return -1; 700 } 701 702 return 0; 703 } 704 705 int gpt_verify_partitions(struct blk_desc *dev_desc, 706 disk_partition_t *partitions, int parts, 707 gpt_header *gpt_head, gpt_entry **gpt_pte) 708 { 709 char efi_str[PARTNAME_SZ + 1]; 710 u64 gpt_part_size; 711 gpt_entry *gpt_e; 712 int ret, i; 713 714 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte); 715 if (ret) 716 return ret; 717 718 gpt_e = *gpt_pte; 719 720 for (i = 0; i < parts; i++) { 721 if (i == gpt_head->num_partition_entries) { 722 pr_err("More partitions than allowed!\n"); 723 return -1; 724 } 725 726 /* Check if GPT and ENV partition names match */ 727 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name, 728 PARTNAME_SZ + 1); 729 730 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ", 731 __func__, i, efi_str, partitions[i].name); 732 733 if (strncmp(efi_str, (char *)partitions[i].name, 734 sizeof(partitions->name))) { 735 pr_err("Partition name: %s does not match %s!\n", 736 efi_str, (char *)partitions[i].name); 737 return -1; 738 } 739 740 /* Check if GPT and ENV sizes match */ 741 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) - 742 le64_to_cpu(gpt_e[i].starting_lba) + 1; 743 debug("size(LBA) - GPT: %8llu, ENV: %8llu ", 744 (unsigned long long)gpt_part_size, 745 (unsigned long long)partitions[i].size); 746 747 if (le64_to_cpu(gpt_part_size) != partitions[i].size) { 748 /* We do not check the extend partition size */ 749 if ((i == parts - 1) && (partitions[i].size == 0)) 750 continue; 751 752 pr_err("Partition %s size: %llu does not match %llu!\n", 753 efi_str, (unsigned long long)gpt_part_size, 754 (unsigned long long)partitions[i].size); 755 return -1; 756 } 757 758 /* 759 * Start address is optional - check only if provided 760 * in '$partition' variable 761 */ 762 if (!partitions[i].start) { 763 debug("\n"); 764 continue; 765 } 766 767 /* Check if GPT and ENV start LBAs match */ 768 debug("start LBA - GPT: %8llu, ENV: %8llu\n", 769 le64_to_cpu(gpt_e[i].starting_lba), 770 (unsigned long long)partitions[i].start); 771 772 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) { 773 pr_err("Partition %s start: %llu does not match %llu!\n", 774 efi_str, le64_to_cpu(gpt_e[i].starting_lba), 775 (unsigned long long)partitions[i].start); 776 return -1; 777 } 778 } 779 780 return 0; 781 } 782 783 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf) 784 { 785 gpt_header *gpt_h; 786 gpt_entry *gpt_e; 787 788 /* determine start of GPT Header in the buffer */ 789 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 790 dev_desc->blksz); 791 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA, 792 dev_desc->lba)) 793 return -1; 794 795 /* determine start of GPT Entries in the buffer */ 796 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 797 dev_desc->blksz); 798 if (validate_gpt_entries(gpt_h, gpt_e)) 799 return -1; 800 801 return 0; 802 } 803 804 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf) 805 { 806 gpt_header *gpt_h; 807 gpt_entry *gpt_e; 808 int gpt_e_blk_cnt; 809 lbaint_t lba; 810 int cnt; 811 812 if (is_valid_gpt_buf(dev_desc, buf)) 813 return -1; 814 815 /* determine start of GPT Header in the buffer */ 816 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA * 817 dev_desc->blksz); 818 819 /* determine start of GPT Entries in the buffer */ 820 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) * 821 dev_desc->blksz); 822 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) * 823 le32_to_cpu(gpt_h->sizeof_partition_entry)), 824 dev_desc); 825 826 /* write MBR */ 827 lba = 0; /* MBR is always at 0 */ 828 cnt = 1; /* MBR (1 block) */ 829 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) { 830 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 831 __func__, "MBR", cnt, lba); 832 return 1; 833 } 834 835 /* write Primary GPT */ 836 lba = GPT_PRIMARY_PARTITION_TABLE_LBA; 837 cnt = 1; /* GPT Header (1 block) */ 838 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 839 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 840 __func__, "Primary GPT Header", cnt, lba); 841 return 1; 842 } 843 844 lba = le64_to_cpu(gpt_h->partition_entry_lba); 845 cnt = gpt_e_blk_cnt; 846 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 847 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 848 __func__, "Primary GPT Entries", cnt, lba); 849 return 1; 850 } 851 852 prepare_backup_gpt_header(gpt_h); 853 854 /* write Backup GPT */ 855 lba = le64_to_cpu(gpt_h->partition_entry_lba); 856 cnt = gpt_e_blk_cnt; 857 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) { 858 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 859 __func__, "Backup GPT Entries", cnt, lba); 860 return 1; 861 } 862 863 lba = le64_to_cpu(gpt_h->my_lba); 864 cnt = 1; /* GPT Header (1 block) */ 865 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) { 866 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n", 867 __func__, "Backup GPT Header", cnt, lba); 868 return 1; 869 } 870 871 return 0; 872 } 873 #endif 874 875 /* 876 * Private functions 877 */ 878 /* 879 * pmbr_part_valid(): Check for EFI partition signature 880 * 881 * Returns: 1 if EFI GPT partition type is found. 882 */ 883 static int pmbr_part_valid(struct partition *part) 884 { 885 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 886 get_unaligned_le32(&part->start_sect) == 1UL) { 887 return 1; 888 } 889 890 return 0; 891 } 892 893 /* 894 * is_pmbr_valid(): test Protective MBR for validity 895 * 896 * Returns: 1 if PMBR is valid, 0 otherwise. 897 * Validity depends on two things: 898 * 1) MSDOS signature is in the last two bytes of the MBR 899 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 900 */ 901 static int is_pmbr_valid(legacy_mbr * mbr) 902 { 903 int i = 0; 904 905 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 906 return 0; 907 908 for (i = 0; i < 4; i++) { 909 if (pmbr_part_valid(&mbr->partition_record[i])) { 910 return 1; 911 } 912 } 913 return 0; 914 } 915 916 /** 917 * is_gpt_valid() - tests one GPT header and PTEs for validity 918 * 919 * lba is the logical block address of the GPT header to test 920 * gpt is a GPT header ptr, filled on return. 921 * ptes is a PTEs ptr, filled on return. 922 * 923 * Description: returns 1 if valid, 0 on error. 924 * If valid, returns pointers to PTEs. 925 */ 926 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba, 927 gpt_header *pgpt_head, gpt_entry **pgpt_pte) 928 { 929 /* Confirm valid arguments prior to allocation. */ 930 if (!dev_desc || !pgpt_head) { 931 printf("%s: Invalid Argument(s)\n", __func__); 932 return 0; 933 } 934 935 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz); 936 937 /* Read MBR Header from device */ 938 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) { 939 printf("*** ERROR: Can't read MBR header ***\n"); 940 return 0; 941 } 942 943 /* Read GPT Header from device */ 944 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) { 945 printf("*** ERROR: Can't read GPT header ***\n"); 946 return 0; 947 } 948 949 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba)) 950 return 0; 951 952 if (dev_desc->sig_type == SIG_TYPE_NONE) { 953 efi_guid_t empty = {}; 954 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) { 955 dev_desc->sig_type = SIG_TYPE_GUID; 956 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid, 957 sizeof(empty)); 958 } else if (mbr->unique_mbr_signature != 0) { 959 dev_desc->sig_type = SIG_TYPE_MBR; 960 dev_desc->mbr_sig = mbr->unique_mbr_signature; 961 } 962 } 963 964 /* Read and allocate Partition Table Entries */ 965 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 966 if (*pgpt_pte == NULL) { 967 printf("GPT: Failed to allocate memory for PTE\n"); 968 return 0; 969 } 970 971 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) { 972 free(*pgpt_pte); 973 return 0; 974 } 975 976 /* We're done, all's well */ 977 return 1; 978 } 979 980 /** 981 * alloc_read_gpt_entries(): reads partition entries from disk 982 * @dev_desc 983 * @gpt - GPT header 984 * 985 * Description: Returns ptes on success, NULL on error. 986 * Allocates space for PTEs based on information found in @gpt. 987 * Notes: remember to free pte when you're done! 988 */ 989 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc, 990 gpt_header *pgpt_head) 991 { 992 size_t count = 0, blk_cnt; 993 lbaint_t blk; 994 gpt_entry *pte = NULL; 995 996 if (!dev_desc || !pgpt_head) { 997 printf("%s: Invalid Argument(s)\n", __func__); 998 return NULL; 999 } 1000 1001 count = le32_to_cpu(pgpt_head->num_partition_entries) * 1002 le32_to_cpu(pgpt_head->sizeof_partition_entry); 1003 1004 debug("%s: count = %u * %u = %lu\n", __func__, 1005 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 1006 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), 1007 (ulong)count); 1008 1009 /* Allocate memory for PTE, remember to FREE */ 1010 if (count != 0) { 1011 pte = memalign(ARCH_DMA_MINALIGN, 1012 PAD_TO_BLOCKSIZE(count, dev_desc)); 1013 } 1014 1015 if (count == 0 || pte == NULL) { 1016 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n", 1017 __func__, (ulong)count); 1018 return NULL; 1019 } 1020 1021 /* Read GPT Entries from device */ 1022 blk = le64_to_cpu(pgpt_head->partition_entry_lba); 1023 blk_cnt = BLOCK_CNT(count, dev_desc); 1024 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) { 1025 printf("*** ERROR: Can't read GPT Entries ***\n"); 1026 free(pte); 1027 return NULL; 1028 } 1029 return pte; 1030 } 1031 1032 /** 1033 * is_pte_valid(): validates a single Partition Table Entry 1034 * @gpt_entry - Pointer to a single Partition Table Entry 1035 * 1036 * Description: returns 1 if valid, 0 on error. 1037 */ 1038 static int is_pte_valid(gpt_entry * pte) 1039 { 1040 efi_guid_t unused_guid; 1041 1042 if (!pte) { 1043 printf("%s: Invalid Argument(s)\n", __func__); 1044 return 0; 1045 } 1046 1047 /* Only one validation for now: 1048 * The GUID Partition Type != Unused Entry (ALL-ZERO) 1049 */ 1050 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 1051 1052 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 1053 sizeof(unused_guid.b)) == 0) { 1054 1055 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 1056 (unsigned int)(uintptr_t)pte); 1057 1058 return 0; 1059 } else { 1060 return 1; 1061 } 1062 } 1063 1064 /* 1065 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to 1066 * check EFI first, since a DOS partition is often used as a 'protective MBR' 1067 * with EFI. 1068 */ 1069 U_BOOT_PART_TYPE(a_efi) = { 1070 .name = "EFI", 1071 .part_type = PART_TYPE_EFI, 1072 .max_entries = GPT_ENTRY_NUMBERS, 1073 .get_info = part_get_info_ptr(part_get_info_efi), 1074 .print = part_print_ptr(part_print_efi), 1075 .test = part_test_efi, 1076 }; 1077 #endif 1078