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