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>
21 #include <linux/ctype.h>
23 DECLARE_GLOBAL_DATA_PTR;
25 #ifdef HAVE_BLOCK_DEVICE
27 * efi_crc32() - EFI version of crc32 function
28 * @buf: buffer to calculate crc32 of
29 * @len - length of buf
31 * Description: Returns EFI-style CRC32 value for @buf
33 static inline u32 efi_crc32(const void *buf, u32 len)
35 return crc32(0, buf, len);
39 * Private function prototypes
42 static int pmbr_part_valid(struct partition *part);
43 static int is_pmbr_valid(legacy_mbr * mbr);
44 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
45 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
46 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
47 gpt_header *pgpt_head);
48 static int is_pte_valid(gpt_entry * pte);
50 static char *print_efiname(gpt_entry *pte)
52 static char name[PARTNAME_SZ + 1];
54 for (i = 0; i < PARTNAME_SZ; i++) {
56 c = pte->partition_name[i] & 0xff;
57 c = (c && !isprint(c)) ? '.' : c;
60 name[PARTNAME_SZ] = 0;
64 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
66 static inline int is_bootable(gpt_entry *p)
68 return p->attributes.fields.legacy_bios_bootable ||
69 !memcmp(&(p->partition_type_guid), &system_guid,
73 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
76 uint32_t crc32_backup = 0;
79 /* Check the GPT header signature */
80 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
81 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
82 "GUID Partition Table Header",
83 le64_to_cpu(gpt_h->signature),
84 GPT_HEADER_SIGNATURE);
88 /* Check the GUID Partition Table CRC */
89 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
90 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
92 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
93 le32_to_cpu(gpt_h->header_size));
95 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
97 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
98 printf("%s CRC is wrong: 0x%x != 0x%x\n",
99 "GUID Partition Table Header",
100 le32_to_cpu(crc32_backup), calc_crc32);
105 * Check that the my_lba entry points to the LBA that contains the GPT
107 if (le64_to_cpu(gpt_h->my_lba) != lba) {
108 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
109 le64_to_cpu(gpt_h->my_lba),
115 * Check that the first_usable_lba and that the last_usable_lba are
118 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
119 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
120 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
123 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
124 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
125 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
129 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
130 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
131 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
136 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
140 /* Check the GUID Partition Table Entry Array CRC */
141 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
142 le32_to_cpu(gpt_h->num_partition_entries) *
143 le32_to_cpu(gpt_h->sizeof_partition_entry));
145 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
146 printf("%s: 0x%x != 0x%x\n",
147 "GUID Partition Table Entry Array CRC is wrong",
148 le32_to_cpu(gpt_h->partition_entry_array_crc32),
156 static void prepare_backup_gpt_header(gpt_header *gpt_h)
161 /* recalculate the values for the Backup GPT Header */
162 val = le64_to_cpu(gpt_h->my_lba);
163 gpt_h->my_lba = gpt_h->alternate_lba;
164 gpt_h->alternate_lba = cpu_to_le64(val);
165 gpt_h->partition_entry_lba =
166 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
167 gpt_h->header_crc32 = 0;
169 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
170 le32_to_cpu(gpt_h->header_size));
171 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
174 #ifdef CONFIG_EFI_PARTITION
176 * Public Functions (include/part.h)
179 void part_print_efi(struct blk_desc *dev_desc)
181 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
182 gpt_entry *gpt_pte = NULL;
185 unsigned char *uuid_bin;
187 /* This function validates AND fills in the GPT header and PTE */
188 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
189 gpt_head, &gpt_pte) != 1) {
190 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
191 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
192 gpt_head, &gpt_pte) != 1) {
193 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
197 printf("%s: *** Using Backup GPT ***\n",
202 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
204 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
205 printf("\tAttributes\n");
206 printf("\tType GUID\n");
207 printf("\tPartition GUID\n");
209 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
210 /* Stop at the first non valid PTE */
211 if (!is_pte_valid(&gpt_pte[i]))
214 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
215 le64_to_cpu(gpt_pte[i].starting_lba),
216 le64_to_cpu(gpt_pte[i].ending_lba),
217 print_efiname(&gpt_pte[i]));
218 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
219 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
220 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
221 printf("\ttype:\t%s\n", uuid);
222 #ifdef CONFIG_PARTITION_TYPE_GUID
223 if (!uuid_guid_get_str(uuid_bin, uuid))
224 printf("\ttype:\t%s\n", uuid);
226 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
227 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
228 printf("\tguid:\t%s\n", uuid);
231 /* Remember to free pte */
236 int part_get_info_efi(struct blk_desc *dev_desc, int part,
237 disk_partition_t *info)
239 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
240 gpt_entry *gpt_pte = NULL;
242 /* "part" argument must be at least 1 */
244 printf("%s: Invalid Argument(s)\n", __func__);
248 /* This function validates AND fills in the GPT header and PTE */
249 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
250 gpt_head, &gpt_pte) != 1) {
251 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
252 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
253 gpt_head, &gpt_pte) != 1) {
254 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
258 printf("%s: *** Using Backup GPT ***\n",
263 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
264 !is_pte_valid(&gpt_pte[part - 1])) {
265 debug("%s: *** ERROR: Invalid partition number %d ***\n",
271 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
272 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
273 /* The ending LBA is inclusive, to calculate size, add 1 to it */
274 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
276 info->blksz = dev_desc->blksz;
278 sprintf((char *)info->name, "%s",
279 print_efiname(&gpt_pte[part - 1]));
280 strcpy((char *)info->type, "U-Boot");
281 info->bootable = is_bootable(&gpt_pte[part - 1]);
282 #ifdef CONFIG_PARTITION_UUIDS
283 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
284 UUID_STR_FORMAT_GUID);
286 #ifdef CONFIG_PARTITION_TYPE_GUID
287 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
288 info->type_guid, UUID_STR_FORMAT_GUID);
291 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
292 info->start, info->size, info->name);
294 /* Remember to free pte */
299 static int part_test_efi(struct blk_desc *dev_desc)
301 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
303 /* Read legacy MBR from block 0 and validate it */
304 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
305 || (is_pmbr_valid(legacymbr) != 1)) {
312 * set_protective_mbr(): Set the EFI protective MBR
313 * @param dev_desc - block device descriptor
315 * @return - zero on success, otherwise error
317 static int set_protective_mbr(struct blk_desc *dev_desc)
319 /* Setup the Protective MBR */
320 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
321 memset(p_mbr, 0, sizeof(*p_mbr));
324 printf("%s: calloc failed!\n", __func__);
327 /* Append signature */
328 p_mbr->signature = MSDOS_MBR_SIGNATURE;
329 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
330 p_mbr->partition_record[0].start_sect = 1;
331 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
333 /* Write MBR sector to the MMC device */
334 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
335 printf("** Can't write to device %d **\n",
343 int write_gpt_table(struct blk_desc *dev_desc,
344 gpt_header *gpt_h, gpt_entry *gpt_e)
346 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
347 * sizeof(gpt_entry)), dev_desc);
350 debug("max lba: %x\n", (u32) dev_desc->lba);
351 /* Setup the Protective MBR */
352 if (set_protective_mbr(dev_desc) < 0)
355 /* Generate CRC for the Primary GPT Header */
356 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
357 le32_to_cpu(gpt_h->num_partition_entries) *
358 le32_to_cpu(gpt_h->sizeof_partition_entry));
359 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
361 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
362 le32_to_cpu(gpt_h->header_size));
363 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
365 /* Write the First GPT to the block right after the Legacy MBR */
366 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
369 if (blk_dwrite(dev_desc, 2, pte_blk_cnt, gpt_e)
373 prepare_backup_gpt_header(gpt_h);
375 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
376 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
379 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
383 debug("GPT successfully written to block device!\n");
387 printf("** Can't write to device %d **\n", dev_desc->devnum);
391 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
392 disk_partition_t *partitions, int parts)
394 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
396 lbaint_t last_usable_lba = (lbaint_t)
397 le64_to_cpu(gpt_h->last_usable_lba);
399 size_t efiname_len, dosname_len;
400 #ifdef CONFIG_PARTITION_UUIDS
402 unsigned char *bin_uuid;
404 #ifdef CONFIG_PARTITION_TYPE_GUID
406 unsigned char *bin_type_guid;
409 for (i = 0; i < parts; i++) {
410 /* partition starting lba */
411 start = partitions[i].start;
412 if (start && (start < offset)) {
413 printf("Partition overlap\n");
417 gpt_e[i].starting_lba = cpu_to_le64(start);
418 offset = start + partitions[i].size;
420 gpt_e[i].starting_lba = cpu_to_le64(offset);
421 offset += partitions[i].size;
423 if (offset > (last_usable_lba + 1)) {
424 printf("Partitions layout exceds disk size\n");
427 /* partition ending lba */
428 if ((i == parts - 1) && (partitions[i].size == 0))
429 /* extend the last partition to maximuim */
430 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
432 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
434 #ifdef CONFIG_PARTITION_TYPE_GUID
435 str_type_guid = partitions[i].type_guid;
436 bin_type_guid = gpt_e[i].partition_type_guid.b;
437 if (strlen(str_type_guid)) {
438 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
439 UUID_STR_FORMAT_GUID)) {
440 printf("Partition no. %d: invalid type guid: %s\n",
445 /* default partition type GUID */
446 memcpy(bin_type_guid,
447 &PARTITION_BASIC_DATA_GUID, 16);
450 /* partition type GUID */
451 memcpy(gpt_e[i].partition_type_guid.b,
452 &PARTITION_BASIC_DATA_GUID, 16);
455 #ifdef CONFIG_PARTITION_UUIDS
456 str_uuid = partitions[i].uuid;
457 bin_uuid = gpt_e[i].unique_partition_guid.b;
459 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) {
460 printf("Partition no. %d: invalid guid: %s\n",
466 /* partition attributes */
467 memset(&gpt_e[i].attributes, 0,
468 sizeof(gpt_entry_attributes));
470 if (partitions[i].bootable)
471 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
474 efiname_len = sizeof(gpt_e[i].partition_name)
475 / sizeof(efi_char16_t);
476 dosname_len = sizeof(partitions[i].name);
478 memset(gpt_e[i].partition_name, 0,
479 sizeof(gpt_e[i].partition_name));
481 for (k = 0; k < min(dosname_len, efiname_len); k++)
482 gpt_e[i].partition_name[k] =
483 (efi_char16_t)(partitions[i].name[k]);
485 debug("%s: name: %s offset[%d]: 0x" LBAF
486 " size[%d]: 0x" LBAF "\n",
487 __func__, partitions[i].name, i,
488 offset, i, partitions[i].size);
494 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
495 char *str_guid, int parts_count)
497 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
498 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
499 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
500 gpt_h->my_lba = cpu_to_le64(1);
501 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
502 gpt_h->first_usable_lba = cpu_to_le64(34);
503 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
504 gpt_h->partition_entry_lba = cpu_to_le64(2);
505 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
506 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
507 gpt_h->header_crc32 = 0;
508 gpt_h->partition_entry_array_crc32 = 0;
510 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
516 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
517 disk_partition_t *partitions, int parts_count)
521 gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
526 printf("%s: calloc failed!\n", __func__);
530 gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
534 printf("%s: calloc failed!\n", __func__);
539 /* Generate Primary GPT header (LBA1) */
540 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
544 /* Generate partition entries */
545 ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count);
549 /* Write GPT partition table */
550 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
558 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n)
560 char *ess = (char *)es;
565 for (i = 0, j = 0; j < n; i += 2, j++) {
572 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
576 * This function validates AND
577 * fills in the GPT header and PTE
579 if (is_gpt_valid(dev_desc,
580 GPT_PRIMARY_PARTITION_TABLE_LBA,
581 gpt_head, gpt_pte) != 1) {
582 printf("%s: *** ERROR: Invalid GPT ***\n",
586 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
587 gpt_head, gpt_pte) != 1) {
588 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
596 int gpt_verify_partitions(struct blk_desc *dev_desc,
597 disk_partition_t *partitions, int parts,
598 gpt_header *gpt_head, gpt_entry **gpt_pte)
600 char efi_str[PARTNAME_SZ + 1];
605 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
611 for (i = 0; i < parts; i++) {
612 if (i == gpt_head->num_partition_entries) {
613 error("More partitions than allowed!\n");
617 /* Check if GPT and ENV partition names match */
618 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
621 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
622 __func__, i, efi_str, partitions[i].name);
624 if (strncmp(efi_str, (char *)partitions[i].name,
625 sizeof(partitions->name))) {
626 error("Partition name: %s does not match %s!\n",
627 efi_str, (char *)partitions[i].name);
631 /* Check if GPT and ENV sizes match */
632 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
633 le64_to_cpu(gpt_e[i].starting_lba) + 1;
634 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
635 (unsigned long long)gpt_part_size,
636 (unsigned long long)partitions[i].size);
638 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
639 /* We do not check the extend partition size */
640 if ((i == parts - 1) && (partitions[i].size == 0))
643 error("Partition %s size: %llu does not match %llu!\n",
644 efi_str, (unsigned long long)gpt_part_size,
645 (unsigned long long)partitions[i].size);
650 * Start address is optional - check only if provided
651 * in '$partition' variable
653 if (!partitions[i].start) {
658 /* Check if GPT and ENV start LBAs match */
659 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
660 le64_to_cpu(gpt_e[i].starting_lba),
661 (unsigned long long)partitions[i].start);
663 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
664 error("Partition %s start: %llu does not match %llu!\n",
665 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
666 (unsigned long long)partitions[i].start);
674 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
679 /* determine start of GPT Header in the buffer */
680 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
682 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
686 /* determine start of GPT Entries in the buffer */
687 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
689 if (validate_gpt_entries(gpt_h, gpt_e))
695 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
703 if (is_valid_gpt_buf(dev_desc, buf))
706 /* determine start of GPT Header in the buffer */
707 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
710 /* determine start of GPT Entries in the buffer */
711 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
713 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
714 le32_to_cpu(gpt_h->sizeof_partition_entry)),
718 lba = 0; /* MBR is always at 0 */
719 cnt = 1; /* MBR (1 block) */
720 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
721 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
722 __func__, "MBR", cnt, lba);
726 /* write Primary GPT */
727 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
728 cnt = 1; /* GPT Header (1 block) */
729 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
730 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
731 __func__, "Primary GPT Header", cnt, lba);
735 lba = le64_to_cpu(gpt_h->partition_entry_lba);
737 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
738 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
739 __func__, "Primary GPT Entries", cnt, lba);
743 prepare_backup_gpt_header(gpt_h);
745 /* write Backup GPT */
746 lba = le64_to_cpu(gpt_h->partition_entry_lba);
748 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
749 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
750 __func__, "Backup GPT Entries", cnt, lba);
754 lba = le64_to_cpu(gpt_h->my_lba);
755 cnt = 1; /* GPT Header (1 block) */
756 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
757 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
758 __func__, "Backup GPT Header", cnt, lba);
770 * pmbr_part_valid(): Check for EFI partition signature
772 * Returns: 1 if EFI GPT partition type is found.
774 static int pmbr_part_valid(struct partition *part)
776 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
777 get_unaligned_le32(&part->start_sect) == 1UL) {
785 * is_pmbr_valid(): test Protective MBR for validity
787 * Returns: 1 if PMBR is valid, 0 otherwise.
788 * Validity depends on two things:
789 * 1) MSDOS signature is in the last two bytes of the MBR
790 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
792 static int is_pmbr_valid(legacy_mbr * mbr)
796 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
799 for (i = 0; i < 4; i++) {
800 if (pmbr_part_valid(&mbr->partition_record[i])) {
808 * is_gpt_valid() - tests one GPT header and PTEs for validity
810 * lba is the logical block address of the GPT header to test
811 * gpt is a GPT header ptr, filled on return.
812 * ptes is a PTEs ptr, filled on return.
814 * Description: returns 1 if valid, 0 on error.
815 * If valid, returns pointers to PTEs.
817 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
818 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
820 if (!dev_desc || !pgpt_head) {
821 printf("%s: Invalid Argument(s)\n", __func__);
825 /* Read GPT Header from device */
826 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
827 printf("*** ERROR: Can't read GPT header ***\n");
831 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
834 /* Read and allocate Partition Table Entries */
835 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
836 if (*pgpt_pte == NULL) {
837 printf("GPT: Failed to allocate memory for PTE\n");
841 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
846 /* We're done, all's well */
851 * alloc_read_gpt_entries(): reads partition entries from disk
855 * Description: Returns ptes on success, NULL on error.
856 * Allocates space for PTEs based on information found in @gpt.
857 * Notes: remember to free pte when you're done!
859 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
860 gpt_header *pgpt_head)
862 size_t count = 0, blk_cnt;
864 gpt_entry *pte = NULL;
866 if (!dev_desc || !pgpt_head) {
867 printf("%s: Invalid Argument(s)\n", __func__);
871 count = le32_to_cpu(pgpt_head->num_partition_entries) *
872 le32_to_cpu(pgpt_head->sizeof_partition_entry);
874 debug("%s: count = %u * %u = %lu\n", __func__,
875 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
876 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
879 /* Allocate memory for PTE, remember to FREE */
881 pte = memalign(ARCH_DMA_MINALIGN,
882 PAD_TO_BLOCKSIZE(count, dev_desc));
885 if (count == 0 || pte == NULL) {
886 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
887 __func__, (ulong)count);
891 /* Read GPT Entries from device */
892 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
893 blk_cnt = BLOCK_CNT(count, dev_desc);
894 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
895 printf("*** ERROR: Can't read GPT Entries ***\n");
903 * is_pte_valid(): validates a single Partition Table Entry
904 * @gpt_entry - Pointer to a single Partition Table Entry
906 * Description: returns 1 if valid, 0 on error.
908 static int is_pte_valid(gpt_entry * pte)
910 efi_guid_t unused_guid;
913 printf("%s: Invalid Argument(s)\n", __func__);
917 /* Only one validation for now:
918 * The GUID Partition Type != Unused Entry (ALL-ZERO)
920 memset(unused_guid.b, 0, sizeof(unused_guid.b));
922 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
923 sizeof(unused_guid.b)) == 0) {
925 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
926 (unsigned int)(uintptr_t)pte);
935 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
936 * check EFI first, since a DOS partition is often used as a 'protective MBR'
939 U_BOOT_PART_TYPE(a_efi) = {
941 .part_type = PART_TYPE_EFI,
942 .max_entries = GPT_ENTRY_NUMBERS,
943 .get_info = part_get_info_ptr(part_get_info_efi),
944 .print = part_print_ptr(part_print_efi),
945 .test = part_test_efi,