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