1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2008 RuggedCom, Inc.
4 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
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
12 #include <asm/unaligned.h>
20 #include <linux/compiler.h>
21 #include <linux/ctype.h>
22 #include <u-boot/crc.h>
24 DECLARE_GLOBAL_DATA_PTR;
27 * GUID for basic data partions.
29 static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
31 #ifdef CONFIG_HAVE_BLOCK_DEVICE
33 * efi_crc32() - EFI version of crc32 function
34 * @buf: buffer to calculate crc32 of
35 * @len - length of buf
37 * Description: Returns EFI-style CRC32 value for @buf
39 static inline u32 efi_crc32(const void *buf, u32 len)
41 return crc32(0, buf, len);
45 * Private function prototypes
48 static int pmbr_part_valid(struct partition *part);
49 static int is_pmbr_valid(legacy_mbr * mbr);
50 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
51 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
52 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
53 gpt_header *pgpt_head);
54 static int is_pte_valid(gpt_entry * pte);
55 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
56 gpt_entry **pgpt_pte);
58 static char *print_efiname(gpt_entry *pte)
60 static char name[PARTNAME_SZ + 1];
62 for (i = 0; i < PARTNAME_SZ; i++) {
64 c = pte->partition_name[i] & 0xff;
65 c = (c && !isprint(c)) ? '.' : c;
68 name[PARTNAME_SZ] = 0;
72 static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
74 static int get_bootable(gpt_entry *p)
78 if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t)))
79 ret |= PART_EFI_SYSTEM_PARTITION;
80 if (p->attributes.fields.legacy_bios_bootable)
85 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
88 uint32_t crc32_backup = 0;
91 /* Check the GPT header signature */
92 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE_UBOOT) {
93 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
94 "GUID Partition Table Header",
95 le64_to_cpu(gpt_h->signature),
96 GPT_HEADER_SIGNATURE_UBOOT);
100 /* Check the GUID Partition Table CRC */
101 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
102 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
104 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
105 le32_to_cpu(gpt_h->header_size));
107 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
109 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
110 printf("%s CRC is wrong: 0x%x != 0x%x\n",
111 "GUID Partition Table Header",
112 le32_to_cpu(crc32_backup), calc_crc32);
117 * Check that the my_lba entry points to the LBA that contains the GPT
119 if (le64_to_cpu(gpt_h->my_lba) != lba) {
120 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
121 le64_to_cpu(gpt_h->my_lba),
127 * Check that the first_usable_lba and that the last_usable_lba are
130 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
131 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
132 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
135 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
136 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
137 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
141 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
142 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
143 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
148 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
152 /* Check the GUID Partition Table Entry Array CRC */
153 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
154 le32_to_cpu(gpt_h->num_partition_entries) *
155 le32_to_cpu(gpt_h->sizeof_partition_entry));
157 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
158 printf("%s: 0x%x != 0x%x\n",
159 "GUID Partition Table Entry Array CRC is wrong",
160 le32_to_cpu(gpt_h->partition_entry_array_crc32),
168 static void prepare_backup_gpt_header(gpt_header *gpt_h)
173 /* recalculate the values for the Backup GPT Header */
174 val = le64_to_cpu(gpt_h->my_lba);
175 gpt_h->my_lba = gpt_h->alternate_lba;
176 gpt_h->alternate_lba = cpu_to_le64(val);
177 gpt_h->partition_entry_lba =
178 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
179 gpt_h->header_crc32 = 0;
181 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
182 le32_to_cpu(gpt_h->header_size));
183 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
186 #if CONFIG_IS_ENABLED(EFI_PARTITION)
188 * Public Functions (include/part.h)
192 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
193 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
195 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
197 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
198 gpt_entry *gpt_pte = NULL;
199 unsigned char *guid_bin;
201 /* This function validates AND fills in the GPT header and PTE */
202 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
205 guid_bin = gpt_head->disk_guid.b;
206 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
208 /* Remember to free pte */
213 void part_print_efi(struct blk_desc *dev_desc)
215 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
216 gpt_entry *gpt_pte = NULL;
218 char uuid[UUID_STR_LEN + 1];
219 unsigned char *uuid_bin;
221 /* This function validates AND fills in the GPT header and PTE */
222 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
225 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
227 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
228 printf("\tAttributes\n");
229 printf("\tType GUID\n");
230 printf("\tPartition GUID\n");
232 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
233 /* Stop at the first non valid PTE */
234 if (!is_pte_valid(&gpt_pte[i]))
237 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
238 le64_to_cpu(gpt_pte[i].starting_lba),
239 le64_to_cpu(gpt_pte[i].ending_lba),
240 print_efiname(&gpt_pte[i]));
241 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
242 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
243 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
244 printf("\ttype:\t%s\n", uuid);
245 #ifdef CONFIG_PARTITION_TYPE_GUID
246 if (!uuid_guid_get_str(uuid_bin, uuid))
247 printf("\ttype:\t%s\n", uuid);
249 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
250 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
251 printf("\tguid:\t%s\n", uuid);
254 /* Remember to free pte */
259 int part_get_info_efi(struct blk_desc *dev_desc, int part,
260 disk_partition_t *info)
262 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
263 gpt_entry *gpt_pte = NULL;
265 /* "part" argument must be at least 1 */
267 printf("%s: Invalid Argument(s)\n", __func__);
271 /* This function validates AND fills in the GPT header and PTE */
272 if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
275 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
276 !is_pte_valid(&gpt_pte[part - 1])) {
277 debug("%s: *** ERROR: Invalid partition number %d ***\n",
283 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
284 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
285 /* The ending LBA is inclusive, to calculate size, add 1 to it */
286 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
288 info->blksz = dev_desc->blksz;
290 snprintf((char *)info->name, sizeof(info->name), "%s",
291 print_efiname(&gpt_pte[part - 1]));
292 strcpy((char *)info->type, "U-Boot");
293 info->bootable = get_bootable(&gpt_pte[part - 1]);
294 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
295 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
296 UUID_STR_FORMAT_GUID);
298 #ifdef CONFIG_PARTITION_TYPE_GUID
299 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
300 info->type_guid, UUID_STR_FORMAT_GUID);
303 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
304 info->start, info->size, info->name);
306 /* Remember to free pte */
311 static int part_test_efi(struct blk_desc *dev_desc)
313 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
315 /* Read legacy MBR from block 0 and validate it */
316 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
317 || (is_pmbr_valid(legacymbr) != 1)) {
324 * set_protective_mbr(): Set the EFI protective MBR
325 * @param dev_desc - block device descriptor
327 * @return - zero on success, otherwise error
329 static int set_protective_mbr(struct blk_desc *dev_desc)
331 /* Setup the Protective MBR */
332 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz);
334 printf("%s: calloc failed!\n", __func__);
338 /* Read MBR to backup boot code if it exists */
339 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
340 pr_err("** Can't read from device %d **\n", dev_desc->devnum);
344 /* Clear all data in MBR except of backed up boot code */
345 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
346 MSDOS_MBR_BOOT_CODE_SIZE);
348 /* Append signature */
349 p_mbr->signature = MSDOS_MBR_SIGNATURE;
350 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
351 p_mbr->partition_record[0].start_sect = 1;
352 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
354 /* Write MBR sector to the MMC device */
355 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
356 printf("** Can't write to device %d **\n",
364 int write_gpt_table(struct blk_desc *dev_desc,
365 gpt_header *gpt_h, gpt_entry *gpt_e)
367 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
368 * sizeof(gpt_entry)), dev_desc);
371 debug("max lba: %x\n", (u32) dev_desc->lba);
372 /* Setup the Protective MBR */
373 if (set_protective_mbr(dev_desc) < 0)
376 /* Generate CRC for the Primary GPT Header */
377 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
378 le32_to_cpu(gpt_h->num_partition_entries) *
379 le32_to_cpu(gpt_h->sizeof_partition_entry));
380 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
382 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
383 le32_to_cpu(gpt_h->header_size));
384 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
386 /* Write the First GPT to the block right after the Legacy MBR */
387 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
390 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
391 pte_blk_cnt, gpt_e) != pte_blk_cnt)
394 prepare_backup_gpt_header(gpt_h);
396 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
397 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
400 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
404 debug("GPT successfully written to block device!\n");
408 printf("** Can't write to device %d **\n", dev_desc->devnum);
412 int gpt_fill_pte(struct blk_desc *dev_desc,
413 gpt_header *gpt_h, gpt_entry *gpt_e,
414 disk_partition_t *partitions, int parts)
416 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
417 lbaint_t last_usable_lba = (lbaint_t)
418 le64_to_cpu(gpt_h->last_usable_lba);
420 size_t efiname_len, dosname_len;
421 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
423 unsigned char *bin_uuid;
425 #ifdef CONFIG_PARTITION_TYPE_GUID
427 unsigned char *bin_type_guid;
429 size_t hdr_start = gpt_h->my_lba;
430 size_t hdr_end = hdr_start + 1;
432 size_t pte_start = gpt_h->partition_entry_lba;
433 size_t pte_end = pte_start +
434 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
437 for (i = 0; i < parts; i++) {
438 /* partition starting lba */
439 lbaint_t start = partitions[i].start;
440 lbaint_t size = partitions[i].size;
443 offset = start + size;
450 * If our partition overlaps with either the GPT
451 * header, or the partition entry, reject it.
453 if (((start < hdr_end && hdr_start < (start + size)) ||
454 (start < pte_end && pte_start < (start + size)))) {
455 printf("Partition overlap\n");
459 gpt_e[i].starting_lba = cpu_to_le64(start);
461 if (offset > (last_usable_lba + 1)) {
462 printf("Partitions layout exceds disk size\n");
465 /* partition ending lba */
466 if ((i == parts - 1) && (size == 0))
467 /* extend the last partition to maximuim */
468 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
470 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
472 #ifdef CONFIG_PARTITION_TYPE_GUID
473 str_type_guid = partitions[i].type_guid;
474 bin_type_guid = gpt_e[i].partition_type_guid.b;
475 if (strlen(str_type_guid)) {
476 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
477 UUID_STR_FORMAT_GUID)) {
478 printf("Partition no. %d: invalid type guid: %s\n",
483 /* default partition type GUID */
484 memcpy(bin_type_guid,
485 &partition_basic_data_guid, 16);
488 /* partition type GUID */
489 memcpy(gpt_e[i].partition_type_guid.b,
490 &partition_basic_data_guid, 16);
493 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
494 str_uuid = partitions[i].uuid;
495 bin_uuid = gpt_e[i].unique_partition_guid.b;
497 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
498 printf("Partition no. %d: invalid guid: %s\n",
504 /* partition attributes */
505 memset(&gpt_e[i].attributes, 0,
506 sizeof(gpt_entry_attributes));
508 if (partitions[i].bootable & PART_BOOTABLE)
509 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
512 efiname_len = sizeof(gpt_e[i].partition_name)
513 / sizeof(efi_char16_t);
514 dosname_len = sizeof(partitions[i].name);
516 memset(gpt_e[i].partition_name, 0,
517 sizeof(gpt_e[i].partition_name));
519 for (k = 0; k < min(dosname_len, efiname_len); k++)
520 gpt_e[i].partition_name[k] =
521 (efi_char16_t)(partitions[i].name[k]);
523 debug("%s: name: %s offset[%d]: 0x" LBAF
524 " size[%d]: 0x" LBAF "\n",
525 __func__, partitions[i].name, i,
532 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
534 uint32_t offset_blks = 2;
535 uint32_t __maybe_unused offset_bytes;
536 int __maybe_unused config_offset;
538 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
540 * Some architectures require their SPL loader at a fixed
541 * address within the first 16KB of the disk. To avoid an
542 * overlap with the partition entries of the EFI partition
543 * table, the first safe offset (in bytes, from the start of
544 * the disk) for the entries can be set in
545 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
548 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
549 offset_blks = offset_bytes / dev_desc->blksz;
552 #if defined(CONFIG_OF_CONTROL)
554 * Allow the offset of the first partition entires (in bytes
555 * from the start of the device) to be specified as a property
556 * of the device tree '/config' node.
558 config_offset = fdtdec_get_config_int(gd->fdt_blob,
559 "u-boot,efi-partition-entries-offset",
561 if (config_offset != -EINVAL) {
562 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
563 offset_blks = offset_bytes / dev_desc->blksz;
567 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
570 * The earliest LBA this can be at is LBA#2 (i.e. right behind
571 * the (protective) MBR and the GPT header.
579 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
580 char *str_guid, int parts_count)
582 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE_UBOOT);
583 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
584 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
585 gpt_h->my_lba = cpu_to_le64(1);
586 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
587 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
588 gpt_h->partition_entry_lba =
589 cpu_to_le64(partition_entries_offset(dev_desc));
590 gpt_h->first_usable_lba =
591 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
592 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
593 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
594 gpt_h->header_crc32 = 0;
595 gpt_h->partition_entry_array_crc32 = 0;
597 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
603 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
604 disk_partition_t *partitions, int parts_count)
610 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc);
611 gpt_h = malloc_cache_aligned(size);
613 printf("%s: calloc failed!\n", __func__);
616 memset(gpt_h, 0, size);
618 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry),
620 gpt_e = malloc_cache_aligned(size);
622 printf("%s: calloc failed!\n", __func__);
626 memset(gpt_e, 0, size);
628 /* Generate Primary GPT header (LBA1) */
629 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
633 /* Generate partition entries */
634 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
638 /* Write GPT partition table */
639 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
648 * gpt_convert_efi_name_to_char() - convert u16 string to char string
650 * TODO: this conversion only supports ANSI characters
653 * @es: u16 string to be converted
654 * @n: size of target buffer
656 static void gpt_convert_efi_name_to_char(char *s, void *es, int n)
663 for (i = 0, j = 0; j < n; i += 2, j++) {
670 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
674 * This function validates AND
675 * fills in the GPT header and PTE
677 if (is_gpt_valid(dev_desc,
678 GPT_PRIMARY_PARTITION_TABLE_LBA,
679 gpt_head, gpt_pte) != 1) {
680 printf("%s: *** ERROR: Invalid GPT ***\n",
685 /* Free pte before allocating again */
688 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
689 gpt_head, gpt_pte) != 1) {
690 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
698 int gpt_verify_partitions(struct blk_desc *dev_desc,
699 disk_partition_t *partitions, int parts,
700 gpt_header *gpt_head, gpt_entry **gpt_pte)
702 char efi_str[PARTNAME_SZ + 1];
707 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
713 for (i = 0; i < parts; i++) {
714 if (i == gpt_head->num_partition_entries) {
715 pr_err("More partitions than allowed!\n");
719 /* Check if GPT and ENV partition names match */
720 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
723 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
724 __func__, i, efi_str, partitions[i].name);
726 if (strncmp(efi_str, (char *)partitions[i].name,
727 sizeof(partitions->name))) {
728 pr_err("Partition name: %s does not match %s!\n",
729 efi_str, (char *)partitions[i].name);
733 /* Check if GPT and ENV sizes match */
734 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
735 le64_to_cpu(gpt_e[i].starting_lba) + 1;
736 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
737 (unsigned long long)gpt_part_size,
738 (unsigned long long)partitions[i].size);
740 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
741 /* We do not check the extend partition size */
742 if ((i == parts - 1) && (partitions[i].size == 0))
745 pr_err("Partition %s size: %llu does not match %llu!\n",
746 efi_str, (unsigned long long)gpt_part_size,
747 (unsigned long long)partitions[i].size);
752 * Start address is optional - check only if provided
753 * in '$partition' variable
755 if (!partitions[i].start) {
760 /* Check if GPT and ENV start LBAs match */
761 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
762 le64_to_cpu(gpt_e[i].starting_lba),
763 (unsigned long long)partitions[i].start);
765 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
766 pr_err("Partition %s start: %llu does not match %llu!\n",
767 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
768 (unsigned long long)partitions[i].start);
776 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
781 /* determine start of GPT Header in the buffer */
782 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
784 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
788 /* determine start of GPT Entries in the buffer */
789 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
791 if (validate_gpt_entries(gpt_h, gpt_e))
797 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
805 if (is_valid_gpt_buf(dev_desc, buf))
808 /* determine start of GPT Header in the buffer */
809 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
812 /* determine start of GPT Entries in the buffer */
813 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
815 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
816 le32_to_cpu(gpt_h->sizeof_partition_entry)),
820 lba = 0; /* MBR is always at 0 */
821 cnt = 1; /* MBR (1 block) */
822 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
823 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
824 __func__, "MBR", cnt, lba);
828 /* write Primary GPT */
829 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
830 cnt = 1; /* GPT Header (1 block) */
831 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
832 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
833 __func__, "Primary GPT Header", cnt, lba);
837 lba = le64_to_cpu(gpt_h->partition_entry_lba);
839 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
840 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
841 __func__, "Primary GPT Entries", cnt, lba);
845 prepare_backup_gpt_header(gpt_h);
847 /* write Backup GPT */
848 lba = le64_to_cpu(gpt_h->partition_entry_lba);
850 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
851 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
852 __func__, "Backup GPT Entries", cnt, lba);
856 lba = le64_to_cpu(gpt_h->my_lba);
857 cnt = 1; /* GPT Header (1 block) */
858 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
859 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
860 __func__, "Backup GPT Header", cnt, lba);
872 * pmbr_part_valid(): Check for EFI partition signature
874 * Returns: 1 if EFI GPT partition type is found.
876 static int pmbr_part_valid(struct partition *part)
878 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
879 get_unaligned_le32(&part->start_sect) == 1UL) {
887 * is_pmbr_valid(): test Protective MBR for validity
889 * Returns: 1 if PMBR is valid, 0 otherwise.
890 * Validity depends on two things:
891 * 1) MSDOS signature is in the last two bytes of the MBR
892 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
894 static int is_pmbr_valid(legacy_mbr * mbr)
898 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
901 for (i = 0; i < 4; i++) {
902 if (pmbr_part_valid(&mbr->partition_record[i])) {
910 * is_gpt_valid() - tests one GPT header and PTEs for validity
912 * lba is the logical block address of the GPT header to test
913 * gpt is a GPT header ptr, filled on return.
914 * ptes is a PTEs ptr, filled on return.
916 * Description: returns 1 if valid, 0 on error, 2 if ignored header
917 * If valid, returns pointers to PTEs.
919 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
920 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
922 /* Confirm valid arguments prior to allocation. */
923 if (!dev_desc || !pgpt_head) {
924 printf("%s: Invalid Argument(s)\n", __func__);
928 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz);
930 /* Read MBR Header from device */
931 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
932 printf("*** ERROR: Can't read MBR header ***\n");
936 /* Read GPT Header from device */
937 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
938 printf("*** ERROR: Can't read GPT header ***\n");
942 /* Invalid but nothing to yell about. */
943 if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) {
944 debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
948 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
951 if (dev_desc->sig_type == SIG_TYPE_NONE) {
952 efi_guid_t empty = {};
953 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
954 dev_desc->sig_type = SIG_TYPE_GUID;
955 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
957 } else if (mbr->unique_mbr_signature != 0) {
958 dev_desc->sig_type = SIG_TYPE_MBR;
959 dev_desc->mbr_sig = mbr->unique_mbr_signature;
963 /* Read and allocate Partition Table Entries */
964 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
965 if (*pgpt_pte == NULL) {
966 printf("GPT: Failed to allocate memory for PTE\n");
970 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
975 /* We're done, all's well */
980 * find_valid_gpt() - finds a valid GPT header and PTEs
982 * gpt is a GPT header ptr, filled on return.
983 * ptes is a PTEs ptr, filled on return.
985 * Description: returns 1 if found a valid gpt, 0 on error.
986 * If valid, returns pointers to PTEs.
988 static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
989 gpt_entry **pgpt_pte)
993 r = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head,
998 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
1000 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), gpt_head,
1002 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
1007 printf("%s: *** Using Backup GPT ***\n",
1014 * alloc_read_gpt_entries(): reads partition entries from disk
1018 * Description: Returns ptes on success, NULL on error.
1019 * Allocates space for PTEs based on information found in @gpt.
1020 * Notes: remember to free pte when you're done!
1022 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
1023 gpt_header *pgpt_head)
1025 size_t count = 0, blk_cnt;
1027 gpt_entry *pte = NULL;
1029 if (!dev_desc || !pgpt_head) {
1030 printf("%s: Invalid Argument(s)\n", __func__);
1034 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1035 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1037 debug("%s: count = %u * %u = %lu\n", __func__,
1038 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
1039 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
1042 /* Allocate memory for PTE, remember to FREE */
1044 pte = memalign(ARCH_DMA_MINALIGN,
1045 PAD_TO_BLOCKSIZE(count, dev_desc));
1048 if (count == 0 || pte == NULL) {
1049 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1050 __func__, (ulong)count);
1054 /* Read GPT Entries from device */
1055 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1056 blk_cnt = BLOCK_CNT(count, dev_desc);
1057 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1058 printf("*** ERROR: Can't read GPT Entries ***\n");
1066 * is_pte_valid(): validates a single Partition Table Entry
1067 * @gpt_entry - Pointer to a single Partition Table Entry
1069 * Description: returns 1 if valid, 0 on error.
1071 static int is_pte_valid(gpt_entry * pte)
1073 efi_guid_t unused_guid;
1076 printf("%s: Invalid Argument(s)\n", __func__);
1080 /* Only one validation for now:
1081 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1083 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1085 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1086 sizeof(unused_guid.b)) == 0) {
1088 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1089 (unsigned int)(uintptr_t)pte);
1098 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1099 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1102 U_BOOT_PART_TYPE(a_efi) = {
1104 .part_type = PART_TYPE_EFI,
1105 .max_entries = GPT_ENTRY_NUMBERS,
1106 .get_info = part_get_info_ptr(part_get_info_efi),
1107 .print = part_print_ptr(part_print_efi),
1108 .test = part_test_efi,