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 tebibytes
13 #define LOG_CATEGORY LOGC_FS
20 #include <asm/cache.h>
21 #include <asm/global_data.h>
22 #include <asm/unaligned.h>
29 #include <dm/ofnode.h>
30 #include <linux/compiler.h>
31 #include <linux/ctype.h>
32 #include <linux/printk.h>
33 #include <u-boot/crc.h>
35 /* GUID for basic data partitons */
36 #if CONFIG_IS_ENABLED(EFI_PARTITION)
37 static const efi_guid_t partition_basic_data_guid
= PARTITION_BASIC_DATA_GUID
;
41 * efi_crc32() - EFI version of crc32 function
42 * @buf: buffer to calculate crc32 of
43 * @len - length of buf
45 * Description: Returns EFI-style CRC32 value for @buf
47 static inline u32
efi_crc32(const void *buf
, u32 len
)
49 return crc32(0, buf
, len
);
53 * Private function prototypes
56 static int pmbr_part_valid(struct partition
*part
);
57 static int is_pmbr_valid(legacy_mbr
* mbr
);
58 static int is_gpt_valid(struct blk_desc
*desc
, u64 lba
, gpt_header
*pgpt_head
,
59 gpt_entry
**pgpt_pte
);
60 static gpt_entry
*alloc_read_gpt_entries(struct blk_desc
*desc
,
61 gpt_header
*pgpt_head
);
62 static int is_pte_valid(gpt_entry
* pte
);
63 static int find_valid_gpt(struct blk_desc
*desc
, gpt_header
*gpt_head
,
64 gpt_entry
**pgpt_pte
);
66 static char *print_efiname(gpt_entry
*pte
)
68 static char name
[PARTNAME_SZ
+ 1];
70 for (i
= 0; i
< PARTNAME_SZ
; i
++) {
72 c
= pte
->partition_name
[i
] & 0xff;
73 c
= (c
&& !isprint(c
)) ? '.' : c
;
76 name
[PARTNAME_SZ
] = 0;
80 static const efi_guid_t system_guid
= PARTITION_SYSTEM_GUID
;
82 static int get_bootable(gpt_entry
*p
)
86 if (!memcmp(&p
->partition_type_guid
, &system_guid
, sizeof(efi_guid_t
)))
87 ret
|= PART_EFI_SYSTEM_PARTITION
;
88 if (p
->attributes
.fields
.legacy_bios_bootable
)
93 static int validate_gpt_header(gpt_header
*gpt_h
, lbaint_t lba
,
96 uint32_t crc32_backup
= 0;
99 /* Check the GPT header signature */
100 if (le64_to_cpu(gpt_h
->signature
) != GPT_HEADER_SIGNATURE_UBOOT
) {
101 log_debug("%s signature is wrong: %#llX != %#llX\n",
102 "GUID Partition Table Header",
103 le64_to_cpu(gpt_h
->signature
),
104 GPT_HEADER_SIGNATURE_UBOOT
);
108 /* Check the GUID Partition Table CRC */
109 memcpy(&crc32_backup
, &gpt_h
->header_crc32
, sizeof(crc32_backup
));
110 memset(&gpt_h
->header_crc32
, 0, sizeof(gpt_h
->header_crc32
));
112 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
113 le32_to_cpu(gpt_h
->header_size
));
115 memcpy(&gpt_h
->header_crc32
, &crc32_backup
, sizeof(crc32_backup
));
117 if (calc_crc32
!= le32_to_cpu(crc32_backup
)) {
118 log_debug("%s: CRC is wrong: %#x != %#x\n",
119 "GUID Partition Table Header",
120 le32_to_cpu(crc32_backup
), calc_crc32
);
125 * Check that the my_lba entry points to the LBA that contains the GPT
127 if (le64_to_cpu(gpt_h
->my_lba
) != lba
) {
128 log_debug("GPT: my_lba incorrect: %llX != " LBAF
"\n",
129 le64_to_cpu(gpt_h
->my_lba
), lba
);
134 * Check that the first_usable_lba and that the last_usable_lba are
137 if (le64_to_cpu(gpt_h
->first_usable_lba
) > lastlba
) {
138 log_debug("GPT: first_usable_lba incorrect: %llX > " LBAF
"\n",
139 le64_to_cpu(gpt_h
->first_usable_lba
), lastlba
);
142 if (le64_to_cpu(gpt_h
->last_usable_lba
) > lastlba
) {
143 log_debug("GPT: last_usable_lba incorrect: %llX > " LBAF
"\n",
144 le64_to_cpu(gpt_h
->last_usable_lba
), lastlba
);
148 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
149 LBAF
"\n", le64_to_cpu(gpt_h
->first_usable_lba
),
150 le64_to_cpu(gpt_h
->last_usable_lba
), lastlba
);
155 static int validate_gpt_entries(gpt_header
*gpt_h
, gpt_entry
*gpt_e
)
159 /* Check the GUID Partition Table Entry Array CRC */
160 calc_crc32
= efi_crc32((const unsigned char *)gpt_e
,
161 le32_to_cpu(gpt_h
->num_partition_entries
) *
162 le32_to_cpu(gpt_h
->sizeof_partition_entry
));
164 if (calc_crc32
!= le32_to_cpu(gpt_h
->partition_entry_array_crc32
)) {
165 log_debug("%s: %#x != %#x\n",
166 "GUID Partition Table Entry Array CRC is wrong",
167 le32_to_cpu(gpt_h
->partition_entry_array_crc32
),
175 static void prepare_backup_gpt_header(gpt_header
*gpt_h
)
180 /* recalculate the values for the Backup GPT Header */
181 val
= le64_to_cpu(gpt_h
->my_lba
);
182 gpt_h
->my_lba
= gpt_h
->alternate_lba
;
183 gpt_h
->alternate_lba
= cpu_to_le64(val
);
184 gpt_h
->partition_entry_lba
=
185 cpu_to_le64(le64_to_cpu(gpt_h
->last_usable_lba
) + 1);
186 gpt_h
->header_crc32
= 0;
188 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
189 le32_to_cpu(gpt_h
->header_size
));
190 gpt_h
->header_crc32
= cpu_to_le32(calc_crc32
);
193 #if CONFIG_IS_ENABLED(EFI_PARTITION)
195 * Public Functions (include/part.h)
199 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
200 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
202 int get_disk_guid(struct blk_desc
*desc
, char *guid
)
204 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, desc
->blksz
);
205 gpt_entry
*gpt_pte
= NULL
;
206 unsigned char *guid_bin
;
208 /* This function validates AND fills in the GPT header and PTE */
209 if (find_valid_gpt(desc
, gpt_head
, &gpt_pte
) != 1)
212 guid_bin
= gpt_head
->disk_guid
.b
;
213 uuid_bin_to_str(guid_bin
, guid
, UUID_STR_FORMAT_GUID
);
215 /* Remember to free pte */
220 void part_print_efi(struct blk_desc
*desc
)
222 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, desc
->blksz
);
223 gpt_entry
*gpt_pte
= NULL
;
227 /* This function validates AND fills in the GPT header and PTE */
228 if (find_valid_gpt(desc
, gpt_head
, &gpt_pte
) != 1)
231 debug("%s: gpt-entry at %p\n", __func__
, gpt_pte
);
233 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
234 printf("\tAttributes\n");
235 printf("\tType GUID\n");
236 printf("\tPartition GUID\n");
238 for (i
= 0; i
< le32_to_cpu(gpt_head
->num_partition_entries
); i
++) {
239 /* Skip invalid PTE */
240 if (!is_pte_valid(&gpt_pte
[i
]))
243 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i
+ 1),
244 le64_to_cpu(gpt_pte
[i
].starting_lba
),
245 le64_to_cpu(gpt_pte
[i
].ending_lba
),
246 print_efiname(&gpt_pte
[i
]));
247 printf("\tattrs:\t0x%016llx\n", gpt_pte
[i
].attributes
.raw
);
248 uuid
= (unsigned char *)gpt_pte
[i
].partition_type_guid
.b
;
249 if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID
))
250 printf("\ttype:\t%pUl\n\t\t(%pUs)\n", uuid
, uuid
);
252 printf("\ttype:\t%pUl\n", uuid
);
253 uuid
= (unsigned char *)gpt_pte
[i
].unique_partition_guid
.b
;
254 printf("\tguid:\t%pUl\n", uuid
);
257 /* Remember to free pte */
262 int part_get_info_efi(struct blk_desc
*desc
, int part
,
263 struct disk_partition
*info
)
265 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_head
, 1, desc
->blksz
);
266 gpt_entry
*gpt_pte
= NULL
;
268 /* "part" argument must be at least 1 */
270 log_debug("Invalid Argument(s)\n");
274 /* This function validates AND fills in the GPT header and PTE */
275 if (find_valid_gpt(desc
, gpt_head
, &gpt_pte
) != 1)
278 if (part
> le32_to_cpu(gpt_head
->num_partition_entries
) ||
279 !is_pte_valid(&gpt_pte
[part
- 1])) {
280 log_debug("Invalid partition number %d\n", part
);
285 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
286 info
->start
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].starting_lba
);
287 /* The ending LBA is inclusive, to calculate size, add 1 to it */
288 info
->size
= (lbaint_t
)le64_to_cpu(gpt_pte
[part
- 1].ending_lba
) + 1
290 info
->blksz
= desc
->blksz
;
292 snprintf((char *)info
->name
, sizeof(info
->name
), "%s",
293 print_efiname(&gpt_pte
[part
- 1]));
294 strcpy((char *)info
->type
, "U-Boot");
295 info
->bootable
= get_bootable(&gpt_pte
[part
- 1]);
296 if (CONFIG_IS_ENABLED(PARTITION_UUIDS
)) {
297 uuid_bin_to_str(gpt_pte
[part
- 1].unique_partition_guid
.b
,
298 (char *)disk_partition_uuid(info
),
299 UUID_STR_FORMAT_GUID
);
301 if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID
)) {
302 uuid_bin_to_str(gpt_pte
[part
- 1].partition_type_guid
.b
,
303 (char *)disk_partition_type_guid(info
),
304 UUID_STR_FORMAT_GUID
);
307 log_debug("start 0x" LBAF
", size 0x" LBAF
", name %s\n", info
->start
,
308 info
->size
, info
->name
);
310 /* Remember to free pte */
315 static int part_test_efi(struct blk_desc
*desc
)
317 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr
, legacymbr
, 1, desc
->blksz
);
319 /* Read legacy MBR from block 0 and validate it */
320 if ((blk_dread(desc
, 0, 1, (ulong
*)legacymbr
) != 1)
321 || (is_pmbr_valid(legacymbr
) != 1)) {
328 * set_protective_mbr(): Set the EFI protective MBR
329 * @param desc - block device descriptor
331 * Return: - zero on success, otherwise error
333 static int set_protective_mbr(struct blk_desc
*desc
)
335 /* Setup the Protective MBR */
336 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr
, p_mbr
, 1, desc
->blksz
);
338 log_debug("calloc failed!\n");
342 /* Read MBR to backup boot code if it exists */
343 if (blk_dread(desc
, 0, 1, p_mbr
) != 1) {
344 log_debug("** Can't read from device %d **\n",
349 /* Clear all data in MBR except of backed up boot code */
350 memset((char *)p_mbr
+ MSDOS_MBR_BOOT_CODE_SIZE
, 0, sizeof(*p_mbr
) -
351 MSDOS_MBR_BOOT_CODE_SIZE
);
353 /* Append signature */
354 p_mbr
->signature
= MSDOS_MBR_SIGNATURE
;
355 p_mbr
->partition_record
[0].sys_ind
= EFI_PMBR_OSTYPE_EFI_GPT
;
356 p_mbr
->partition_record
[0].start_sect
= 1;
357 p_mbr
->partition_record
[0].nr_sects
= (u32
)desc
->lba
- 1;
359 /* Write MBR sector to the MMC device */
360 if (blk_dwrite(desc
, 0, 1, p_mbr
) != 1) {
361 log_debug("** Can't write to device %d **\n", desc
->devnum
);
368 int write_gpt_table(struct blk_desc
*desc
, gpt_header
*gpt_h
, gpt_entry
*gpt_e
)
370 const int pte_blk_cnt
= BLOCK_CNT((gpt_h
->num_partition_entries
371 * sizeof(gpt_entry
)), desc
);
374 debug("max lba: %x\n", (u32
)desc
->lba
);
375 /* Setup the Protective MBR */
376 if (set_protective_mbr(desc
) < 0)
379 /* Generate CRC for the Primary GPT Header */
380 calc_crc32
= efi_crc32((const unsigned char *)gpt_e
,
381 le32_to_cpu(gpt_h
->num_partition_entries
) *
382 le32_to_cpu(gpt_h
->sizeof_partition_entry
));
383 gpt_h
->partition_entry_array_crc32
= cpu_to_le32(calc_crc32
);
385 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
386 le32_to_cpu(gpt_h
->header_size
));
387 gpt_h
->header_crc32
= cpu_to_le32(calc_crc32
);
389 /* Write the First GPT to the block right after the Legacy MBR */
390 if (blk_dwrite(desc
, 1, 1, gpt_h
) != 1)
393 if (blk_dwrite(desc
, le64_to_cpu(gpt_h
->partition_entry_lba
),
394 pte_blk_cnt
, gpt_e
) != pte_blk_cnt
)
397 prepare_backup_gpt_header(gpt_h
);
399 if (blk_dwrite(desc
, (lbaint_t
)le64_to_cpu(gpt_h
->last_usable_lba
)
400 + 1, pte_blk_cnt
, gpt_e
) != pte_blk_cnt
)
403 if (blk_dwrite(desc
, (lbaint_t
)le64_to_cpu(gpt_h
->my_lba
), 1,
407 debug("GPT successfully written to block device!\n");
411 log_debug("** Can't write to device %d **\n", desc
->devnum
);
415 int gpt_fill_pte(struct blk_desc
*desc
,
416 gpt_header
*gpt_h
, gpt_entry
*gpt_e
,
417 struct disk_partition
*partitions
, int parts
)
419 lbaint_t offset
= (lbaint_t
)le64_to_cpu(gpt_h
->first_usable_lba
);
420 lbaint_t last_usable_lba
= (lbaint_t
)
421 le64_to_cpu(gpt_h
->last_usable_lba
);
423 size_t efiname_len
, dosname_len
;
424 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 log_debug("Partition overlap\n");
459 gpt_e
[i
].starting_lba
= cpu_to_le64(start
);
461 if (offset
> (last_usable_lba
+ 1)) {
462 log_debug("Partitions layout exceeds 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 log_debug("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 const char *str_uuid
;
496 str_uuid
= disk_partition_uuid(&partitions
[i
]);
497 bin_uuid
= gpt_e
[i
].unique_partition_guid
.b
;
499 if (uuid_str_to_bin(str_uuid
, bin_uuid
,
500 UUID_STR_FORMAT_GUID
)) {
501 log_debug("Partition no. %d: invalid guid: %s\n",
507 /* partition attributes */
508 memset(&gpt_e
[i
].attributes
, 0,
509 sizeof(gpt_entry_attributes
));
511 if (partitions
[i
].bootable
& PART_BOOTABLE
)
512 gpt_e
[i
].attributes
.fields
.legacy_bios_bootable
= 1;
515 efiname_len
= sizeof(gpt_e
[i
].partition_name
)
516 / sizeof(efi_char16_t
);
517 dosname_len
= sizeof(partitions
[i
].name
);
519 memset(gpt_e
[i
].partition_name
, 0,
520 sizeof(gpt_e
[i
].partition_name
));
522 for (k
= 0; k
< min(dosname_len
, efiname_len
); k
++)
523 gpt_e
[i
].partition_name
[k
] =
524 (efi_char16_t
)(partitions
[i
].name
[k
]);
526 debug("%s: name: %s offset[%d]: 0x" LBAF
527 " size[%d]: 0x" LBAF
"\n",
528 __func__
, partitions
[i
].name
, i
,
535 static uint32_t partition_entries_offset(struct blk_desc
*desc
)
537 uint32_t offset_blks
= 2;
538 uint32_t __maybe_unused offset_bytes
;
539 int __maybe_unused config_offset
;
541 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
543 * Some architectures require their SPL loader at a fixed
544 * address within the first 16KB of the disk. To avoid an
545 * overlap with the partition entries of the EFI partition
546 * table, the first safe offset (in bytes, from the start of
547 * the disk) for the entries can be set in
548 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
551 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF
, desc
);
552 offset_blks
= offset_bytes
/ desc
->blksz
;
555 #if defined(CONFIG_OF_CONTROL)
557 * Allow the offset of the first partition entires (in bytes
558 * from the start of the device) to be specified as a property
559 * of the device tree '/config' node.
561 config_offset
= ofnode_conf_read_int(
562 "u-boot,efi-partition-entries-offset", -EINVAL
);
563 if (config_offset
!= -EINVAL
) {
564 offset_bytes
= PAD_TO_BLOCKSIZE(config_offset
, desc
);
565 offset_blks
= offset_bytes
/ desc
->blksz
;
569 debug("efi: partition entries offset (in blocks): %d\n", offset_blks
);
572 * The earliest LBA this can be at is LBA#2 (i.e. right behind
573 * the (protective) MBR and the GPT header.
581 int gpt_fill_header(struct blk_desc
*desc
, gpt_header
*gpt_h
, char *str_guid
,
584 gpt_h
->signature
= cpu_to_le64(GPT_HEADER_SIGNATURE_UBOOT
);
585 gpt_h
->revision
= cpu_to_le32(GPT_HEADER_REVISION_V1
);
586 gpt_h
->header_size
= cpu_to_le32(sizeof(gpt_header
));
587 gpt_h
->my_lba
= cpu_to_le64(1);
588 gpt_h
->alternate_lba
= cpu_to_le64(desc
->lba
- 1);
589 gpt_h
->last_usable_lba
= cpu_to_le64(desc
->lba
- 34);
590 gpt_h
->partition_entry_lba
=
591 cpu_to_le64(partition_entries_offset(desc
));
592 gpt_h
->first_usable_lba
=
593 cpu_to_le64(le64_to_cpu(gpt_h
->partition_entry_lba
) + 32);
594 gpt_h
->num_partition_entries
= cpu_to_le32(GPT_ENTRY_NUMBERS
);
595 gpt_h
->sizeof_partition_entry
= cpu_to_le32(sizeof(gpt_entry
));
596 gpt_h
->header_crc32
= 0;
597 gpt_h
->partition_entry_array_crc32
= 0;
599 if (uuid_str_to_bin(str_guid
, gpt_h
->disk_guid
.b
, UUID_STR_FORMAT_GUID
))
605 int gpt_restore(struct blk_desc
*desc
, char *str_disk_guid
,
606 struct disk_partition
*partitions
, int parts_count
)
612 size
= PAD_TO_BLOCKSIZE(sizeof(gpt_header
), desc
);
613 gpt_h
= malloc_cache_aligned(size
);
615 log_debug("calloc failed!\n");
618 memset(gpt_h
, 0, size
);
620 size
= PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
* sizeof(gpt_entry
),
622 gpt_e
= malloc_cache_aligned(size
);
624 log_debug("calloc failed!\n");
628 memset(gpt_e
, 0, size
);
630 /* Generate Primary GPT header (LBA1) */
631 ret
= gpt_fill_header(desc
, gpt_h
, str_disk_guid
, parts_count
);
635 /* Generate partition entries */
636 ret
= gpt_fill_pte(desc
, gpt_h
, gpt_e
, partitions
, parts_count
);
640 /* Write GPT partition table */
641 ret
= write_gpt_table(desc
, gpt_h
, gpt_e
);
650 * gpt_convert_efi_name_to_char() - convert u16 string to char string
652 * TODO: this conversion only supports ANSI characters
655 * @es: u16 string to be converted
656 * @n: size of target buffer
658 static void gpt_convert_efi_name_to_char(char *s
, void *es
, int n
)
665 for (i
= 0, j
= 0; j
< n
; i
+= 2, j
++) {
672 int gpt_verify_headers(struct blk_desc
*desc
, gpt_header
*gpt_head
,
676 * This function validates AND
677 * fills in the GPT header and PTE
679 if (is_gpt_valid(desc
,
680 GPT_PRIMARY_PARTITION_TABLE_LBA
,
681 gpt_head
, gpt_pte
) != 1) {
682 log_debug("Invalid GPT\n");
686 /* Free pte before allocating again */
690 * Check that the alternate_lba entry points to the last LBA
692 if (le64_to_cpu(gpt_head
->alternate_lba
) != (desc
->lba
- 1)) {
693 log_debug("Misplaced Backup GPT\n");
697 if (is_gpt_valid(desc
, (desc
->lba
- 1),
698 gpt_head
, gpt_pte
) != 1) {
699 log_debug("Invalid Backup GPT\n");
706 static void restore_primary_gpt_header(gpt_header
*gpt_h
, struct blk_desc
*desc
)
711 /* recalculate the values for the Primary GPT Header */
712 val
= le64_to_cpu(gpt_h
->my_lba
);
713 gpt_h
->my_lba
= gpt_h
->alternate_lba
;
714 gpt_h
->alternate_lba
= cpu_to_le64(val
);
715 gpt_h
->partition_entry_lba
= cpu_to_le64(partition_entries_offset(desc
));
717 gpt_h
->header_crc32
= 0;
719 calc_crc32
= efi_crc32((const unsigned char *)gpt_h
,
720 le32_to_cpu(gpt_h
->header_size
));
721 gpt_h
->header_crc32
= cpu_to_le32(calc_crc32
);
724 static int write_one_gpt_table(struct blk_desc
*desc
, gpt_header
*gpt_h
,
727 const int pte_blk_cnt
= BLOCK_CNT((gpt_h
->num_partition_entries
728 * sizeof(gpt_entry
)), desc
);
732 start
= le64_to_cpu(gpt_h
->my_lba
);
733 if (blk_dwrite(desc
, start
, 1, gpt_h
) != 1) {
738 start
= le64_to_cpu(gpt_h
->partition_entry_lba
);
739 if (blk_dwrite(desc
, start
, pte_blk_cnt
, gpt_e
) != pte_blk_cnt
) {
748 int gpt_repair_headers(struct blk_desc
*desc
)
750 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_h1
, 1, desc
->blksz
);
751 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header
, gpt_h2
, 1, desc
->blksz
);
752 gpt_entry
*gpt_e1
= NULL
, *gpt_e2
= NULL
;
753 int is_gpt1_valid
, is_gpt2_valid
;
756 is_gpt1_valid
= is_gpt_valid(desc
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
758 is_gpt2_valid
= is_gpt_valid(desc
, desc
->lba
- 1,
761 if (is_gpt1_valid
&& is_gpt2_valid
) {
766 if (is_gpt1_valid
&& !is_gpt2_valid
) {
767 prepare_backup_gpt_header(gpt_h1
);
768 ret
= write_one_gpt_table(desc
, gpt_h1
, gpt_e1
);
772 if (!is_gpt1_valid
&& is_gpt2_valid
) {
773 restore_primary_gpt_header(gpt_h2
, desc
);
774 ret
= write_one_gpt_table(desc
, gpt_h2
, gpt_e2
);
778 if (!is_gpt1_valid
&& !is_gpt2_valid
) {
792 int gpt_verify_partitions(struct blk_desc
*desc
,
793 struct disk_partition
*partitions
, int parts
,
794 gpt_header
*gpt_head
, gpt_entry
**gpt_pte
)
796 char efi_str
[PARTNAME_SZ
+ 1];
801 ret
= gpt_verify_headers(desc
, gpt_head
, gpt_pte
);
807 for (i
= 0; i
< parts
; i
++) {
808 if (i
== gpt_head
->num_partition_entries
) {
809 pr_err("More partitions than allowed!\n");
813 /* Check if GPT and ENV partition names match */
814 gpt_convert_efi_name_to_char(efi_str
, gpt_e
[i
].partition_name
,
817 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
818 __func__
, i
, efi_str
, partitions
[i
].name
);
820 if (strncmp(efi_str
, (char *)partitions
[i
].name
,
821 sizeof(partitions
->name
))) {
822 pr_err("Partition name: %s does not match %s!\n",
823 efi_str
, (char *)partitions
[i
].name
);
827 /* Check if GPT and ENV sizes match */
828 gpt_part_size
= le64_to_cpu(gpt_e
[i
].ending_lba
) -
829 le64_to_cpu(gpt_e
[i
].starting_lba
) + 1;
830 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
831 (unsigned long long)gpt_part_size
,
832 (unsigned long long)partitions
[i
].size
);
834 if (le64_to_cpu(gpt_part_size
) != partitions
[i
].size
) {
835 /* We do not check the extend partition size */
836 if ((i
== parts
- 1) && (partitions
[i
].size
== 0))
839 pr_err("Partition %s size: %llu does not match %llu!\n",
840 efi_str
, (unsigned long long)gpt_part_size
,
841 (unsigned long long)partitions
[i
].size
);
846 * Start address is optional - check only if provided
847 * in '$partition' variable
849 if (!partitions
[i
].start
) {
854 /* Check if GPT and ENV start LBAs match */
855 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
856 le64_to_cpu(gpt_e
[i
].starting_lba
),
857 (unsigned long long)partitions
[i
].start
);
859 if (le64_to_cpu(gpt_e
[i
].starting_lba
) != partitions
[i
].start
) {
860 pr_err("Partition %s start: %llu does not match %llu!\n",
861 efi_str
, le64_to_cpu(gpt_e
[i
].starting_lba
),
862 (unsigned long long)partitions
[i
].start
);
870 int is_valid_gpt_buf(struct blk_desc
*desc
, void *buf
)
875 /* determine start of GPT Header in the buffer */
876 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
* desc
->blksz
);
877 if (validate_gpt_header(gpt_h
, GPT_PRIMARY_PARTITION_TABLE_LBA
,
881 /* determine start of GPT Entries in the buffer */
882 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) *
884 if (validate_gpt_entries(gpt_h
, gpt_e
))
890 int write_mbr_and_gpt_partitions(struct blk_desc
*desc
, void *buf
)
898 if (is_valid_gpt_buf(desc
, buf
))
901 /* determine start of GPT Header in the buffer */
902 gpt_h
= buf
+ (GPT_PRIMARY_PARTITION_TABLE_LBA
* desc
->blksz
);
904 /* determine start of GPT Entries in the buffer */
905 gpt_e
= buf
+ (le64_to_cpu(gpt_h
->partition_entry_lba
) * desc
->blksz
);
906 gpt_e_blk_cnt
= BLOCK_CNT((le32_to_cpu(gpt_h
->num_partition_entries
) *
907 le32_to_cpu(gpt_h
->sizeof_partition_entry
)),
911 lba
= 0; /* MBR is always at 0 */
912 cnt
= 1; /* MBR (1 block) */
913 if (blk_dwrite(desc
, lba
, cnt
, buf
) != cnt
) {
914 log_debug("failed writing '%s' (%d blks at 0x" LBAF
")\n",
919 /* write Primary GPT */
920 lba
= GPT_PRIMARY_PARTITION_TABLE_LBA
;
921 cnt
= 1; /* GPT Header (1 block) */
922 if (blk_dwrite(desc
, lba
, cnt
, gpt_h
) != cnt
) {
923 log_debug("failed writing '%s' (%d blks at 0x" LBAF
")\n",
924 "Primary GPT Header", cnt
, lba
);
928 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
930 if (blk_dwrite(desc
, lba
, cnt
, gpt_e
) != cnt
) {
931 log_debug("failed writing '%s' (%d blks at 0x" LBAF
")\n",
932 "Primary GPT Entries", cnt
, lba
);
936 prepare_backup_gpt_header(gpt_h
);
938 /* write Backup GPT */
939 lba
= le64_to_cpu(gpt_h
->partition_entry_lba
);
941 if (blk_dwrite(desc
, lba
, cnt
, gpt_e
) != cnt
) {
942 log_debug("failed writing '%s' (%d blks at 0x" LBAF
")\n",
943 "Backup GPT Entries", cnt
, lba
);
947 lba
= le64_to_cpu(gpt_h
->my_lba
);
948 cnt
= 1; /* GPT Header (1 block) */
949 if (blk_dwrite(desc
, lba
, cnt
, gpt_h
) != cnt
) {
950 log_debug("failed writing '%s' (%d blks at 0x" LBAF
")\n",
951 "Backup GPT Header", cnt
, lba
);
955 /* Update the partition table entries*/
966 * pmbr_part_valid(): Check for EFI partition signature
968 * Returns: 1 if EFI GPT partition type is found.
970 static int pmbr_part_valid(struct partition
*part
)
972 if (part
->sys_ind
== EFI_PMBR_OSTYPE_EFI_GPT
&&
973 get_unaligned_le32(&part
->start_sect
) == 1UL) {
981 * is_pmbr_valid(): test Protective MBR for validity
983 * @mbr: Pointer to Master Boot-Record data
985 * Returns: 1 if PMBR is valid, 0 otherwise.
986 * Validity depends on two things:
987 * 1) MSDOS signature is in the last two bytes of the MBR
988 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
990 static int is_pmbr_valid(legacy_mbr
*mbr
)
992 uint sig
= le16_to_cpu(mbr
->signature
);
995 if (sig
!= MSDOS_MBR_SIGNATURE
) {
996 log_debug("Invalid signature %x\n", sig
);
999 log_debug("Signature %x valid\n", sig
);
1001 for (i
= 0; i
< 4; i
++) {
1002 if (pmbr_part_valid(&mbr
->partition_record
[i
])) {
1010 * is_gpt_valid() - tests one GPT header and PTEs for validity
1012 * lba is the logical block address of the GPT header to test
1013 * gpt is a GPT header ptr, filled on return.
1014 * ptes is a PTEs ptr, filled on return.
1016 * Description: returns 1 if valid, 0 on error, 2 if ignored header
1017 * If valid, returns pointers to PTEs.
1019 static int is_gpt_valid(struct blk_desc
*desc
, u64 lba
, gpt_header
*pgpt_head
,
1020 gpt_entry
**pgpt_pte
)
1022 /* Confirm valid arguments prior to allocation. */
1023 if (!desc
|| !pgpt_head
) {
1024 log_debug("Invalid Argument(s)\n");
1028 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr
, mbr
, 1, desc
->blksz
);
1030 /* Read MBR Header from device */
1031 if (blk_dread(desc
, 0, 1, (ulong
*)mbr
) != 1) {
1032 log_debug("Can't read MBR header\n");
1036 /* Read GPT Header from device */
1037 if (blk_dread(desc
, (lbaint_t
)lba
, 1, pgpt_head
) != 1) {
1038 log_debug("Can't read GPT header\n");
1042 /* Invalid but nothing to yell about. */
1043 if (le64_to_cpu(pgpt_head
->signature
) == GPT_HEADER_CHROMEOS_IGNORE
) {
1044 log_debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
1048 if (validate_gpt_header(pgpt_head
, (lbaint_t
)lba
, desc
->lba
))
1051 if (desc
->sig_type
== SIG_TYPE_NONE
) {
1052 efi_guid_t empty
= {};
1053 if (memcmp(&pgpt_head
->disk_guid
, &empty
, sizeof(empty
))) {
1054 desc
->sig_type
= SIG_TYPE_GUID
;
1055 memcpy(&desc
->guid_sig
, &pgpt_head
->disk_guid
,
1057 } else if (mbr
->unique_mbr_signature
!= 0) {
1058 desc
->sig_type
= SIG_TYPE_MBR
;
1059 desc
->mbr_sig
= mbr
->unique_mbr_signature
;
1063 /* Read and allocate Partition Table Entries */
1064 *pgpt_pte
= alloc_read_gpt_entries(desc
, pgpt_head
);
1068 if (validate_gpt_entries(pgpt_head
, *pgpt_pte
)) {
1073 /* We're done, all's well */
1078 * find_valid_gpt() - finds a valid GPT header and PTEs
1080 * gpt is a GPT header ptr, filled on return.
1081 * ptes is a PTEs ptr, filled on return.
1083 * Description: returns 1 if found a valid gpt, 0 on error.
1084 * If valid, returns pointers to PTEs.
1086 static int find_valid_gpt(struct blk_desc
*desc
, gpt_header
*gpt_head
,
1087 gpt_entry
**pgpt_pte
)
1091 r
= is_gpt_valid(desc
, GPT_PRIMARY_PARTITION_TABLE_LBA
, gpt_head
,
1096 log_debug("Invalid GPT\n");
1098 if (is_gpt_valid(desc
, desc
->lba
- 1, gpt_head
, pgpt_pte
)
1100 log_debug("Invalid Backup GPT\n");
1104 log_debug(" Using Backup GPT\n");
1110 * alloc_read_gpt_entries(): reads partition entries from disk
1114 * Description: Returns ptes on success, NULL on error.
1115 * Allocates space for PTEs based on information found in @gpt.
1116 * Notes: remember to free pte when you're done!
1118 static gpt_entry
*alloc_read_gpt_entries(struct blk_desc
*desc
,
1119 gpt_header
*pgpt_head
)
1121 size_t count
= 0, blk_cnt
;
1123 gpt_entry
*pte
= NULL
;
1125 if (!desc
|| !pgpt_head
) {
1126 log_debug("Invalid Argument(s)\n");
1130 count
= le32_to_cpu(pgpt_head
->num_partition_entries
) *
1131 le32_to_cpu(pgpt_head
->sizeof_partition_entry
);
1133 log_debug("count = %u * %u = %lu\n",
1134 (u32
)le32_to_cpu(pgpt_head
->num_partition_entries
),
1135 (u32
)le32_to_cpu(pgpt_head
->sizeof_partition_entry
),
1138 /* Allocate memory for PTE, remember to FREE */
1140 pte
= memalign(ARCH_DMA_MINALIGN
,
1141 PAD_TO_BLOCKSIZE(count
, desc
));
1144 if (count
== 0 || pte
== NULL
) {
1145 log_debug("ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1150 /* Read GPT Entries from device */
1151 blk
= le64_to_cpu(pgpt_head
->partition_entry_lba
);
1152 blk_cnt
= BLOCK_CNT(count
, desc
);
1153 if (blk_dread(desc
, blk
, (lbaint_t
)blk_cnt
, pte
) != blk_cnt
) {
1154 log_debug("Can't read GPT Entries\n");
1162 * is_pte_valid(): validates a single Partition Table Entry
1163 * @gpt_entry - Pointer to a single Partition Table Entry
1165 * Description: returns 1 if valid, 0 on error.
1167 static int is_pte_valid(gpt_entry
* pte
)
1169 efi_guid_t unused_guid
;
1172 log_debug("Invalid Argument(s)\n");
1176 /* Only one validation for now:
1177 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1179 memset(unused_guid
.b
, 0, sizeof(unused_guid
.b
));
1181 if (memcmp(pte
->partition_type_guid
.b
, unused_guid
.b
,
1182 sizeof(unused_guid
.b
)) == 0) {
1184 log_debug("Found an unused PTE GUID at 0x%08X\n",
1185 (unsigned int)(uintptr_t)pte
);
1194 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1195 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1198 U_BOOT_PART_TYPE(a_efi
) = {
1200 .part_type
= PART_TYPE_EFI
,
1201 .max_entries
= GPT_ENTRY_NUMBERS
,
1202 .get_info
= part_get_info_ptr(part_get_info_efi
),
1203 .print
= part_print_ptr(part_print_efi
),
1204 .test
= part_test_efi
,