2 * Copyright (C) 2008 RuggedCom, Inc.
3 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
5 * SPDX-License-Identifier: GPL-2.0+
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
13 #include <asm/unaligned.h>
22 #include <linux/compiler.h>
23 #include <linux/ctype.h>
25 DECLARE_GLOBAL_DATA_PTR;
27 #ifdef HAVE_BLOCK_DEVICE
29 * efi_crc32() - EFI version of crc32 function
30 * @buf: buffer to calculate crc32 of
31 * @len - length of buf
33 * Description: Returns EFI-style CRC32 value for @buf
35 static inline u32 efi_crc32(const void *buf, u32 len)
37 return crc32(0, buf, len);
41 * Private function prototypes
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);
52 static char *print_efiname(gpt_entry *pte)
54 static char name[PARTNAME_SZ + 1];
56 for (i = 0; i < PARTNAME_SZ; i++) {
58 c = pte->partition_name[i] & 0xff;
59 c = (c && !isprint(c)) ? '.' : c;
62 name[PARTNAME_SZ] = 0;
66 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
68 static inline int is_bootable(gpt_entry *p)
70 return p->attributes.fields.legacy_bios_bootable ||
71 !memcmp(&(p->partition_type_guid), &system_guid,
75 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
78 uint32_t crc32_backup = 0;
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);
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));
94 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
95 le32_to_cpu(gpt_h->header_size));
97 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
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);
107 * Check that the my_lba entry points to the LBA that contains the GPT
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),
117 * Check that the first_usable_lba and that the last_usable_lba are
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);
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);
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);
138 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
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));
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),
158 static void prepare_backup_gpt_header(gpt_header *gpt_h)
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;
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);
176 #if CONFIG_IS_ENABLED(EFI_PARTITION)
178 * Public Functions (include/part.h)
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
185 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
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;
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",
201 printf("%s: *** Using Backup GPT ***\n",
206 guid_bin = gpt_head->disk_guid.b;
207 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
212 void part_print_efi(struct blk_desc *dev_desc)
214 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
215 gpt_entry *gpt_pte = NULL;
217 char uuid[UUID_STR_LEN + 1];
218 unsigned char *uuid_bin;
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",
230 printf("%s: *** Using Backup GPT ***\n",
235 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
237 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
238 printf("\tAttributes\n");
239 printf("\tType GUID\n");
240 printf("\tPartition GUID\n");
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]))
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);
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);
264 /* Remember to free pte */
269 int part_get_info_efi(struct blk_desc *dev_desc, int part,
270 disk_partition_t *info)
272 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
273 gpt_entry *gpt_pte = NULL;
275 /* "part" argument must be at least 1 */
277 printf("%s: Invalid Argument(s)\n", __func__);
281 /* This function validates AND fills in the GPT header and PTE */
282 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
283 gpt_head, &gpt_pte) != 1) {
284 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
285 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
286 gpt_head, &gpt_pte) != 1) {
287 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
291 printf("%s: *** Using Backup GPT ***\n",
296 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
297 !is_pte_valid(&gpt_pte[part - 1])) {
298 debug("%s: *** ERROR: Invalid partition number %d ***\n",
304 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
305 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
306 /* The ending LBA is inclusive, to calculate size, add 1 to it */
307 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
309 info->blksz = dev_desc->blksz;
311 sprintf((char *)info->name, "%s",
312 print_efiname(&gpt_pte[part - 1]));
313 strcpy((char *)info->type, "U-Boot");
314 info->bootable = is_bootable(&gpt_pte[part - 1]);
315 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
316 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
317 UUID_STR_FORMAT_GUID);
319 #ifdef CONFIG_PARTITION_TYPE_GUID
320 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
321 info->type_guid, UUID_STR_FORMAT_GUID);
324 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
325 info->start, info->size, info->name);
327 /* Remember to free pte */
332 static int part_test_efi(struct blk_desc *dev_desc)
334 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
336 /* Read legacy MBR from block 0 and validate it */
337 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
338 || (is_pmbr_valid(legacymbr) != 1)) {
345 * set_protective_mbr(): Set the EFI protective MBR
346 * @param dev_desc - block device descriptor
348 * @return - zero on success, otherwise error
350 static int set_protective_mbr(struct blk_desc *dev_desc)
352 /* Setup the Protective MBR */
353 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
354 memset(p_mbr, 0, sizeof(*p_mbr));
357 printf("%s: calloc failed!\n", __func__);
361 /* Read MBR to backup boot code if it exists */
362 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
363 error("** Can't read from device %d **\n", dev_desc->devnum);
367 /* Append signature */
368 p_mbr->signature = MSDOS_MBR_SIGNATURE;
369 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
370 p_mbr->partition_record[0].start_sect = 1;
371 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
373 /* Write MBR sector to the MMC device */
374 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
375 printf("** Can't write to device %d **\n",
383 int write_gpt_table(struct blk_desc *dev_desc,
384 gpt_header *gpt_h, gpt_entry *gpt_e)
386 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
387 * sizeof(gpt_entry)), dev_desc);
390 debug("max lba: %x\n", (u32) dev_desc->lba);
391 /* Setup the Protective MBR */
392 if (set_protective_mbr(dev_desc) < 0)
395 /* Generate CRC for the Primary GPT Header */
396 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
397 le32_to_cpu(gpt_h->num_partition_entries) *
398 le32_to_cpu(gpt_h->sizeof_partition_entry));
399 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
401 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
402 le32_to_cpu(gpt_h->header_size));
403 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
405 /* Write the First GPT to the block right after the Legacy MBR */
406 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
409 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
410 pte_blk_cnt, gpt_e) != pte_blk_cnt)
413 prepare_backup_gpt_header(gpt_h);
415 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
416 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
419 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
423 debug("GPT successfully written to block device!\n");
427 printf("** Can't write to device %d **\n", dev_desc->devnum);
431 int gpt_fill_pte(struct blk_desc *dev_desc,
432 gpt_header *gpt_h, gpt_entry *gpt_e,
433 disk_partition_t *partitions, int parts)
435 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
436 lbaint_t last_usable_lba = (lbaint_t)
437 le64_to_cpu(gpt_h->last_usable_lba);
439 size_t efiname_len, dosname_len;
440 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
442 unsigned char *bin_uuid;
444 #ifdef CONFIG_PARTITION_TYPE_GUID
446 unsigned char *bin_type_guid;
449 for (i = 0; i < parts; i++) {
450 /* partition starting lba */
451 lbaint_t start = partitions[i].start;
452 lbaint_t size = partitions[i].size;
454 if (start && (start < offset)) {
455 printf("Partition overlap\n");
460 gpt_e[i].starting_lba = cpu_to_le64(start);
461 offset = start + size;
463 gpt_e[i].starting_lba = cpu_to_le64(offset);
466 if (offset > (last_usable_lba + 1)) {
467 printf("Partitions layout exceds disk size\n");
470 /* partition ending lba */
471 if ((i == parts - 1) && (size == 0))
472 /* extend the last partition to maximuim */
473 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
475 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
477 #ifdef CONFIG_PARTITION_TYPE_GUID
478 str_type_guid = partitions[i].type_guid;
479 bin_type_guid = gpt_e[i].partition_type_guid.b;
480 if (strlen(str_type_guid)) {
481 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
482 UUID_STR_FORMAT_GUID)) {
483 printf("Partition no. %d: invalid type guid: %s\n",
488 /* default partition type GUID */
489 memcpy(bin_type_guid,
490 &PARTITION_BASIC_DATA_GUID, 16);
493 /* partition type GUID */
494 memcpy(gpt_e[i].partition_type_guid.b,
495 &PARTITION_BASIC_DATA_GUID, 16);
498 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
499 str_uuid = partitions[i].uuid;
500 bin_uuid = gpt_e[i].unique_partition_guid.b;
502 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
503 printf("Partition no. %d: invalid guid: %s\n",
509 /* partition attributes */
510 memset(&gpt_e[i].attributes, 0,
511 sizeof(gpt_entry_attributes));
513 if (partitions[i].bootable)
514 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
517 efiname_len = sizeof(gpt_e[i].partition_name)
518 / sizeof(efi_char16_t);
519 dosname_len = sizeof(partitions[i].name);
521 memset(gpt_e[i].partition_name, 0,
522 sizeof(gpt_e[i].partition_name));
524 for (k = 0; k < min(dosname_len, efiname_len); k++)
525 gpt_e[i].partition_name[k] =
526 (efi_char16_t)(partitions[i].name[k]);
528 debug("%s: name: %s offset[%d]: 0x" LBAF
529 " size[%d]: 0x" LBAF "\n",
530 __func__, partitions[i].name, i,
537 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
539 uint32_t offset_blks = 2;
540 uint32_t __maybe_unused offset_bytes;
541 int __maybe_unused config_offset;
543 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
545 * Some architectures require their SPL loader at a fixed
546 * address within the first 16KB of the disk. To avoid an
547 * overlap with the partition entries of the EFI partition
548 * table, the first safe offset (in bytes, from the start of
549 * the disk) for the entries can be set in
550 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
553 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
554 offset_blks = offset_bytes / dev_desc->blksz;
557 #if defined(CONFIG_OF_CONTROL)
559 * Allow the offset of the first partition entires (in bytes
560 * from the start of the device) to be specified as a property
561 * of the device tree '/config' node.
563 config_offset = fdtdec_get_config_int(gd->fdt_blob,
564 "u-boot,efi-partition-entries-offset",
566 if (config_offset != -EINVAL) {
567 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
568 offset_blks = offset_bytes / dev_desc->blksz;
572 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
575 * The earliest LBA this can be at is LBA#2 (i.e. right behind
576 * the (protective) MBR and the GPT header.
584 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
585 char *str_guid, int parts_count)
587 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
588 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
589 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
590 gpt_h->my_lba = cpu_to_le64(1);
591 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
592 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
593 gpt_h->partition_entry_lba =
594 cpu_to_le64(partition_entries_offset(dev_desc));
595 gpt_h->first_usable_lba =
596 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
597 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
598 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
599 gpt_h->header_crc32 = 0;
600 gpt_h->partition_entry_array_crc32 = 0;
602 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
608 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
609 disk_partition_t *partitions, int parts_count)
613 gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
618 printf("%s: calloc failed!\n", __func__);
622 gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
626 printf("%s: calloc failed!\n", __func__);
631 /* Generate Primary GPT header (LBA1) */
632 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
636 /* Generate partition entries */
637 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
641 /* Write GPT partition table */
642 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
650 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n)
652 char *ess = (char *)es;
657 for (i = 0, j = 0; j < n; i += 2, j++) {
664 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
668 * This function validates AND
669 * fills in the GPT header and PTE
671 if (is_gpt_valid(dev_desc,
672 GPT_PRIMARY_PARTITION_TABLE_LBA,
673 gpt_head, gpt_pte) != 1) {
674 printf("%s: *** ERROR: Invalid GPT ***\n",
678 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
679 gpt_head, gpt_pte) != 1) {
680 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
688 int gpt_verify_partitions(struct blk_desc *dev_desc,
689 disk_partition_t *partitions, int parts,
690 gpt_header *gpt_head, gpt_entry **gpt_pte)
692 char efi_str[PARTNAME_SZ + 1];
697 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
703 for (i = 0; i < parts; i++) {
704 if (i == gpt_head->num_partition_entries) {
705 error("More partitions than allowed!\n");
709 /* Check if GPT and ENV partition names match */
710 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
713 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
714 __func__, i, efi_str, partitions[i].name);
716 if (strncmp(efi_str, (char *)partitions[i].name,
717 sizeof(partitions->name))) {
718 error("Partition name: %s does not match %s!\n",
719 efi_str, (char *)partitions[i].name);
723 /* Check if GPT and ENV sizes match */
724 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
725 le64_to_cpu(gpt_e[i].starting_lba) + 1;
726 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
727 (unsigned long long)gpt_part_size,
728 (unsigned long long)partitions[i].size);
730 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
731 /* We do not check the extend partition size */
732 if ((i == parts - 1) && (partitions[i].size == 0))
735 error("Partition %s size: %llu does not match %llu!\n",
736 efi_str, (unsigned long long)gpt_part_size,
737 (unsigned long long)partitions[i].size);
742 * Start address is optional - check only if provided
743 * in '$partition' variable
745 if (!partitions[i].start) {
750 /* Check if GPT and ENV start LBAs match */
751 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
752 le64_to_cpu(gpt_e[i].starting_lba),
753 (unsigned long long)partitions[i].start);
755 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
756 error("Partition %s start: %llu does not match %llu!\n",
757 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
758 (unsigned long long)partitions[i].start);
766 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
771 /* determine start of GPT Header in the buffer */
772 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
774 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
778 /* determine start of GPT Entries in the buffer */
779 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
781 if (validate_gpt_entries(gpt_h, gpt_e))
787 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
795 if (is_valid_gpt_buf(dev_desc, buf))
798 /* determine start of GPT Header in the buffer */
799 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
802 /* determine start of GPT Entries in the buffer */
803 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
805 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
806 le32_to_cpu(gpt_h->sizeof_partition_entry)),
810 lba = 0; /* MBR is always at 0 */
811 cnt = 1; /* MBR (1 block) */
812 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
813 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
814 __func__, "MBR", cnt, lba);
818 /* write Primary GPT */
819 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
820 cnt = 1; /* GPT Header (1 block) */
821 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
822 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
823 __func__, "Primary GPT Header", cnt, lba);
827 lba = le64_to_cpu(gpt_h->partition_entry_lba);
829 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
830 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
831 __func__, "Primary GPT Entries", cnt, lba);
835 prepare_backup_gpt_header(gpt_h);
837 /* write Backup GPT */
838 lba = le64_to_cpu(gpt_h->partition_entry_lba);
840 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
841 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
842 __func__, "Backup GPT Entries", cnt, lba);
846 lba = le64_to_cpu(gpt_h->my_lba);
847 cnt = 1; /* GPT Header (1 block) */
848 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
849 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
850 __func__, "Backup GPT Header", cnt, lba);
862 * pmbr_part_valid(): Check for EFI partition signature
864 * Returns: 1 if EFI GPT partition type is found.
866 static int pmbr_part_valid(struct partition *part)
868 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
869 get_unaligned_le32(&part->start_sect) == 1UL) {
877 * is_pmbr_valid(): test Protective MBR for validity
879 * Returns: 1 if PMBR is valid, 0 otherwise.
880 * Validity depends on two things:
881 * 1) MSDOS signature is in the last two bytes of the MBR
882 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
884 static int is_pmbr_valid(legacy_mbr * mbr)
888 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
891 for (i = 0; i < 4; i++) {
892 if (pmbr_part_valid(&mbr->partition_record[i])) {
900 * is_gpt_valid() - tests one GPT header and PTEs for validity
902 * lba is the logical block address of the GPT header to test
903 * gpt is a GPT header ptr, filled on return.
904 * ptes is a PTEs ptr, filled on return.
906 * Description: returns 1 if valid, 0 on error.
907 * If valid, returns pointers to PTEs.
909 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
910 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
912 if (!dev_desc || !pgpt_head) {
913 printf("%s: Invalid Argument(s)\n", __func__);
917 /* Read GPT Header from device */
918 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
919 printf("*** ERROR: Can't read GPT header ***\n");
923 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
926 /* Read and allocate Partition Table Entries */
927 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
928 if (*pgpt_pte == NULL) {
929 printf("GPT: Failed to allocate memory for PTE\n");
933 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
938 /* We're done, all's well */
943 * alloc_read_gpt_entries(): reads partition entries from disk
947 * Description: Returns ptes on success, NULL on error.
948 * Allocates space for PTEs based on information found in @gpt.
949 * Notes: remember to free pte when you're done!
951 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
952 gpt_header *pgpt_head)
954 size_t count = 0, blk_cnt;
956 gpt_entry *pte = NULL;
958 if (!dev_desc || !pgpt_head) {
959 printf("%s: Invalid Argument(s)\n", __func__);
963 count = le32_to_cpu(pgpt_head->num_partition_entries) *
964 le32_to_cpu(pgpt_head->sizeof_partition_entry);
966 debug("%s: count = %u * %u = %lu\n", __func__,
967 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
968 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
971 /* Allocate memory for PTE, remember to FREE */
973 pte = memalign(ARCH_DMA_MINALIGN,
974 PAD_TO_BLOCKSIZE(count, dev_desc));
977 if (count == 0 || pte == NULL) {
978 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
979 __func__, (ulong)count);
983 /* Read GPT Entries from device */
984 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
985 blk_cnt = BLOCK_CNT(count, dev_desc);
986 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
987 printf("*** ERROR: Can't read GPT Entries ***\n");
995 * is_pte_valid(): validates a single Partition Table Entry
996 * @gpt_entry - Pointer to a single Partition Table Entry
998 * Description: returns 1 if valid, 0 on error.
1000 static int is_pte_valid(gpt_entry * pte)
1002 efi_guid_t unused_guid;
1005 printf("%s: Invalid Argument(s)\n", __func__);
1009 /* Only one validation for now:
1010 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1012 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1014 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1015 sizeof(unused_guid.b)) == 0) {
1017 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1018 (unsigned int)(uintptr_t)pte);
1027 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1028 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1031 U_BOOT_PART_TYPE(a_efi) = {
1033 .part_type = PART_TYPE_EFI,
1034 .max_entries = GPT_ENTRY_NUMBERS,
1035 .get_info = part_get_info_ptr(part_get_info_efi),
1036 .print = part_print_ptr(part_print_efi),
1037 .test = part_test_efi,