summaryrefslogtreecommitdiff
path: root/disk/part_efi.c
blob: 7862beeea6f8392e736d832ceb40949049e8f458 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
/*
 * Copyright (C) 2008 RuggedCom, Inc.
 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * NOTE:
 *   when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
 *   limits the maximum size of addressable storage to < 2 Terra Bytes
 */
#include <asm/unaligned.h>
#include <common.h>
#include <command.h>
#include <fdtdec.h>
#include <ide.h>
#include <inttypes.h>
#include <malloc.h>
#include <memalign.h>
#include <part_efi.h>
#include <linux/compiler.h>
#include <linux/ctype.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef HAVE_BLOCK_DEVICE
/**
 * efi_crc32() - EFI version of crc32 function
 * @buf: buffer to calculate crc32 of
 * @len - length of buf
 *
 * Description: Returns EFI-style CRC32 value for @buf
 */
static inline u32 efi_crc32(const void *buf, u32 len)
{
	return crc32(0, buf, len);
}

/*
 * Private function prototypes
 */

static int pmbr_part_valid(struct partition *part);
static int is_pmbr_valid(legacy_mbr * mbr);
static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
				gpt_header *pgpt_head, gpt_entry **pgpt_pte);
static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
					 gpt_header *pgpt_head);
static int is_pte_valid(gpt_entry * pte);

static char *print_efiname(gpt_entry *pte)
{
	static char name[PARTNAME_SZ + 1];
	int i;
	for (i = 0; i < PARTNAME_SZ; i++) {
		u8 c;
		c = pte->partition_name[i] & 0xff;
		c = (c && !isprint(c)) ? '.' : c;
		name[i] = c;
	}
	name[PARTNAME_SZ] = 0;
	return name;
}

static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;

static inline int is_bootable(gpt_entry *p)
{
	return p->attributes.fields.legacy_bios_bootable ||
		!memcmp(&(p->partition_type_guid), &system_guid,
			sizeof(efi_guid_t));
}

static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
		lbaint_t lastlba)
{
	uint32_t crc32_backup = 0;
	uint32_t calc_crc32;

	/* Check the GPT header signature */
	if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
		printf("%s signature is wrong: 0x%llX != 0x%llX\n",
		       "GUID Partition Table Header",
		       le64_to_cpu(gpt_h->signature),
		       GPT_HEADER_SIGNATURE);
		return -1;
	}

	/* Check the GUID Partition Table CRC */
	memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
	memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));

	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
		le32_to_cpu(gpt_h->header_size));

	memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));

	if (calc_crc32 != le32_to_cpu(crc32_backup)) {
		printf("%s CRC is wrong: 0x%x != 0x%x\n",
		       "GUID Partition Table Header",
		       le32_to_cpu(crc32_backup), calc_crc32);
		return -1;
	}

	/*
	 * Check that the my_lba entry points to the LBA that contains the GPT
	 */
	if (le64_to_cpu(gpt_h->my_lba) != lba) {
		printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
		       le64_to_cpu(gpt_h->my_lba),
		       lba);
		return -1;
	}

	/*
	 * Check that the first_usable_lba and that the last_usable_lba are
	 * within the disk.
	 */
	if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
		printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
		       le64_to_cpu(gpt_h->first_usable_lba), lastlba);
		return -1;
	}
	if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
		printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
		       le64_to_cpu(gpt_h->last_usable_lba), lastlba);
		return -1;
	}

	debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
	      LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
	      le64_to_cpu(gpt_h->last_usable_lba), lastlba);

	return 0;
}

static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
{
	uint32_t calc_crc32;

	/* Check the GUID Partition Table Entry Array CRC */
	calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
		le32_to_cpu(gpt_h->num_partition_entries) *
		le32_to_cpu(gpt_h->sizeof_partition_entry));

	if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
		printf("%s: 0x%x != 0x%x\n",
		       "GUID Partition Table Entry Array CRC is wrong",
		       le32_to_cpu(gpt_h->partition_entry_array_crc32),
		       calc_crc32);
		return -1;
	}

	return 0;
}

static void prepare_backup_gpt_header(gpt_header *gpt_h)
{
	uint32_t calc_crc32;
	uint64_t val;

	/* recalculate the values for the Backup GPT Header */
	val = le64_to_cpu(gpt_h->my_lba);
	gpt_h->my_lba = gpt_h->alternate_lba;
	gpt_h->alternate_lba = cpu_to_le64(val);
	gpt_h->partition_entry_lba =
			cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
	gpt_h->header_crc32 = 0;

	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
			       le32_to_cpu(gpt_h->header_size));
	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
}

#if CONFIG_IS_ENABLED(EFI_PARTITION)
/*
 * Public Functions (include/part.h)
 */

/*
 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
 */
int get_disk_guid(struct blk_desc * dev_desc, char *guid)
{
	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
	gpt_entry *gpt_pte = NULL;
	unsigned char *guid_bin;

	/* This function validates AND fills in the GPT header and PTE */
	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
			 gpt_head, &gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
		if (is_gpt_valid(dev_desc, dev_desc->lba - 1,
				 gpt_head, &gpt_pte) != 1) {
			printf("%s: *** ERROR: Invalid Backup GPT ***\n",
			       __func__);
			return -EINVAL;
		} else {
			printf("%s: ***        Using Backup GPT ***\n",
			       __func__);
		}
	}

	guid_bin = gpt_head->disk_guid.b;
	uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);

	return 0;
}

void part_print_efi(struct blk_desc *dev_desc)
{
	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
	gpt_entry *gpt_pte = NULL;
	int i = 0;
	char uuid[UUID_STR_LEN + 1];
	unsigned char *uuid_bin;

	/* This function validates AND fills in the GPT header and PTE */
	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
			 gpt_head, &gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
		if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
				 gpt_head, &gpt_pte) != 1) {
			printf("%s: *** ERROR: Invalid Backup GPT ***\n",
			       __func__);
			return;
		} else {
			printf("%s: ***        Using Backup GPT ***\n",
			       __func__);
		}
	}

	debug("%s: gpt-entry at %p\n", __func__, gpt_pte);

	printf("Part\tStart LBA\tEnd LBA\t\tName\n");
	printf("\tAttributes\n");
	printf("\tType GUID\n");
	printf("\tPartition GUID\n");

	for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
		/* Stop at the first non valid PTE */
		if (!is_pte_valid(&gpt_pte[i]))
			break;

		printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
			le64_to_cpu(gpt_pte[i].starting_lba),
			le64_to_cpu(gpt_pte[i].ending_lba),
			print_efiname(&gpt_pte[i]));
		printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
		uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
		printf("\ttype:\t%s\n", uuid);
#ifdef CONFIG_PARTITION_TYPE_GUID
		if (!uuid_guid_get_str(uuid_bin, uuid))
			printf("\ttype:\t%s\n", uuid);
#endif
		uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
		printf("\tguid:\t%s\n", uuid);
	}

	/* Remember to free pte */
	free(gpt_pte);
	return;
}

int part_get_info_efi(struct blk_desc *dev_desc, int part,
		      disk_partition_t *info)
{
	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
	gpt_entry *gpt_pte = NULL;

	/* "part" argument must be at least 1 */
	if (part < 1) {
		printf("%s: Invalid Argument(s)\n", __func__);
		return -1;
	}

	/* This function validates AND fills in the GPT header and PTE */
	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
			gpt_head, &gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
		if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
				 gpt_head, &gpt_pte) != 1) {
			printf("%s: *** ERROR: Invalid Backup GPT ***\n",
			       __func__);
			return -1;
		} else {
			printf("%s: ***        Using Backup GPT ***\n",
			       __func__);
		}
	}

	if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
	    !is_pte_valid(&gpt_pte[part - 1])) {
		debug("%s: *** ERROR: Invalid partition number %d ***\n",
			__func__, part);
		free(gpt_pte);
		return -1;
	}

	/* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
	info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
	/* The ending LBA is inclusive, to calculate size, add 1 to it */
	info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
		     - info->start;
	info->blksz = dev_desc->blksz;

	sprintf((char *)info->name, "%s",
			print_efiname(&gpt_pte[part - 1]));
	strcpy((char *)info->type, "U-Boot");
	info->bootable = is_bootable(&gpt_pte[part - 1]);
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
	uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
			UUID_STR_FORMAT_GUID);
#endif
#ifdef CONFIG_PARTITION_TYPE_GUID
	uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
			info->type_guid, UUID_STR_FORMAT_GUID);
#endif

	debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
	      info->start, info->size, info->name);

	/* Remember to free pte */
	free(gpt_pte);
	return 0;
}

static int part_test_efi(struct blk_desc *dev_desc)
{
	ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);

	/* Read legacy MBR from block 0 and validate it */
	if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
		|| (is_pmbr_valid(legacymbr) != 1)) {
		return -1;
	}
	return 0;
}

/**
 * set_protective_mbr(): Set the EFI protective MBR
 * @param dev_desc - block device descriptor
 *
 * @return - zero on success, otherwise error
 */
static int set_protective_mbr(struct blk_desc *dev_desc)
{
	/* Setup the Protective MBR */
	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
	memset(p_mbr, 0, sizeof(*p_mbr));

	if (p_mbr == NULL) {
		printf("%s: calloc failed!\n", __func__);
		return -1;
	}

	/* Read MBR to backup boot code if it exists */
	if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
		pr_err("** Can't read from device %d **\n", dev_desc->devnum);
		return -1;
	}

	/* Append signature */
	p_mbr->signature = MSDOS_MBR_SIGNATURE;
	p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
	p_mbr->partition_record[0].start_sect = 1;
	p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;

	/* Write MBR sector to the MMC device */
	if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
		printf("** Can't write to device %d **\n",
			dev_desc->devnum);
		return -1;
	}

	return 0;
}

int write_gpt_table(struct blk_desc *dev_desc,
		gpt_header *gpt_h, gpt_entry *gpt_e)
{
	const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
					   * sizeof(gpt_entry)), dev_desc);
	u32 calc_crc32;

	debug("max lba: %x\n", (u32) dev_desc->lba);
	/* Setup the Protective MBR */
	if (set_protective_mbr(dev_desc) < 0)
		goto err;

	/* Generate CRC for the Primary GPT Header */
	calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
			      le32_to_cpu(gpt_h->num_partition_entries) *
			      le32_to_cpu(gpt_h->sizeof_partition_entry));
	gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);

	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
			      le32_to_cpu(gpt_h->header_size));
	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);

	/* Write the First GPT to the block right after the Legacy MBR */
	if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
		goto err;

	if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
		       pte_blk_cnt, gpt_e) != pte_blk_cnt)
		goto err;

	prepare_backup_gpt_header(gpt_h);

	if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
		       + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
		goto err;

	if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
		       gpt_h) != 1)
		goto err;

	debug("GPT successfully written to block device!\n");
	return 0;

 err:
	printf("** Can't write to device %d **\n", dev_desc->devnum);
	return -1;
}

int gpt_fill_pte(struct blk_desc *dev_desc,
		 gpt_header *gpt_h, gpt_entry *gpt_e,
		 disk_partition_t *partitions, int parts)
{
	lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
	lbaint_t last_usable_lba = (lbaint_t)
			le64_to_cpu(gpt_h->last_usable_lba);
	int i, k;
	size_t efiname_len, dosname_len;
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
	char *str_uuid;
	unsigned char *bin_uuid;
#endif
#ifdef CONFIG_PARTITION_TYPE_GUID
	char *str_type_guid;
	unsigned char *bin_type_guid;
#endif
	size_t hdr_start = gpt_h->my_lba;
	size_t hdr_end = hdr_start + 1;

	size_t pte_start = gpt_h->partition_entry_lba;
	size_t pte_end = pte_start +
		gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
		dev_desc->blksz;

	for (i = 0; i < parts; i++) {
		/* partition starting lba */
		lbaint_t start = partitions[i].start;
		lbaint_t size = partitions[i].size;

		if (start) {
			offset = start + size;
		} else {
			start = offset;
			offset += size;
		}

		/*
		 * If our partition overlaps with either the GPT
		 * header, or the partition entry, reject it.
		 */
		if (((start < hdr_end && hdr_start < (start + size)) ||
		     (start < pte_end && pte_start < (start + size)))) {
			printf("Partition overlap\n");
			return -1;
		}

		gpt_e[i].starting_lba = cpu_to_le64(start);

		if (offset > (last_usable_lba + 1)) {
			printf("Partitions layout exceds disk size\n");
			return -1;
		}
		/* partition ending lba */
		if ((i == parts - 1) && (size == 0))
			/* extend the last partition to maximuim */
			gpt_e[i].ending_lba = gpt_h->last_usable_lba;
		else
			gpt_e[i].ending_lba = cpu_to_le64(offset - 1);

#ifdef CONFIG_PARTITION_TYPE_GUID
		str_type_guid = partitions[i].type_guid;
		bin_type_guid = gpt_e[i].partition_type_guid.b;
		if (strlen(str_type_guid)) {
			if (uuid_str_to_bin(str_type_guid, bin_type_guid,
					    UUID_STR_FORMAT_GUID)) {
				printf("Partition no. %d: invalid type guid: %s\n",
				       i, str_type_guid);
				return -1;
			}
		} else {
			/* default partition type GUID */
			memcpy(bin_type_guid,
			       &PARTITION_BASIC_DATA_GUID, 16);
		}
#else
		/* partition type GUID */
		memcpy(gpt_e[i].partition_type_guid.b,
			&PARTITION_BASIC_DATA_GUID, 16);
#endif

#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
		str_uuid = partitions[i].uuid;
		bin_uuid = gpt_e[i].unique_partition_guid.b;

		if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
			printf("Partition no. %d: invalid guid: %s\n",
				i, str_uuid);
			return -1;
		}
#endif

		/* partition attributes */
		memset(&gpt_e[i].attributes, 0,
		       sizeof(gpt_entry_attributes));

		if (partitions[i].bootable)
			gpt_e[i].attributes.fields.legacy_bios_bootable = 1;

		/* partition name */
		efiname_len = sizeof(gpt_e[i].partition_name)
			/ sizeof(efi_char16_t);
		dosname_len = sizeof(partitions[i].name);

		memset(gpt_e[i].partition_name, 0,
		       sizeof(gpt_e[i].partition_name));

		for (k = 0; k < min(dosname_len, efiname_len); k++)
			gpt_e[i].partition_name[k] =
				(efi_char16_t)(partitions[i].name[k]);

		debug("%s: name: %s offset[%d]: 0x" LBAF
		      " size[%d]: 0x" LBAF "\n",
		      __func__, partitions[i].name, i,
		      offset, i, size);
	}

	return 0;
}

static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
{
	uint32_t offset_blks = 2;
	uint32_t __maybe_unused offset_bytes;
	int __maybe_unused config_offset;

#if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
	/*
	 * Some architectures require their SPL loader at a fixed
	 * address within the first 16KB of the disk.  To avoid an
	 * overlap with the partition entries of the EFI partition
	 * table, the first safe offset (in bytes, from the start of
	 * the disk) for the entries can be set in
	 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
	 */
	offset_bytes =
		PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
	offset_blks = offset_bytes / dev_desc->blksz;
#endif

#if defined(CONFIG_OF_CONTROL)
	/*
	 * Allow the offset of the first partition entires (in bytes
	 * from the start of the device) to be specified as a property
	 * of the device tree '/config' node.
	 */
	config_offset = fdtdec_get_config_int(gd->fdt_blob,
					      "u-boot,efi-partition-entries-offset",
					      -EINVAL);
	if (config_offset != -EINVAL) {
		offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
		offset_blks = offset_bytes / dev_desc->blksz;
	}
#endif

	debug("efi: partition entries offset (in blocks): %d\n", offset_blks);

	/*
	 * The earliest LBA this can be at is LBA#2 (i.e. right behind
	 * the (protective) MBR and the GPT header.
	 */
	if (offset_blks < 2)
		offset_blks = 2;

	return offset_blks;
}

int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
		char *str_guid, int parts_count)
{
	gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
	gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
	gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
	gpt_h->my_lba = cpu_to_le64(1);
	gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
	gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
	gpt_h->partition_entry_lba =
		cpu_to_le64(partition_entries_offset(dev_desc));
	gpt_h->first_usable_lba =
		cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
	gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
	gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
	gpt_h->header_crc32 = 0;
	gpt_h->partition_entry_array_crc32 = 0;

	if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
		return -1;

	return 0;
}

int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
		disk_partition_t *partitions, int parts_count)
{
	int ret;

	gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
						       dev_desc));
	gpt_entry *gpt_e;

	if (gpt_h == NULL) {
		printf("%s: calloc failed!\n", __func__);
		return -1;
	}

	gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
					       * sizeof(gpt_entry),
					       dev_desc));
	if (gpt_e == NULL) {
		printf("%s: calloc failed!\n", __func__);
		free(gpt_h);
		return -1;
	}

	/* Generate Primary GPT header (LBA1) */
	ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
	if (ret)
		goto err;

	/* Generate partition entries */
	ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
	if (ret)
		goto err;

	/* Write GPT partition table */
	ret = write_gpt_table(dev_desc, gpt_h, gpt_e);

err:
	free(gpt_e);
	free(gpt_h);
	return ret;
}

static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n)
{
	char *ess = (char *)es;
	int i, j;

	memset(s, '\0', n);

	for (i = 0, j = 0; j < n; i += 2, j++) {
		s[j] = ess[i];
		if (!ess[i])
			return;
	}
}

int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
		       gpt_entry **gpt_pte)
{
	/*
	 * This function validates AND
	 * fills in the GPT header and PTE
	 */
	if (is_gpt_valid(dev_desc,
			 GPT_PRIMARY_PARTITION_TABLE_LBA,
			 gpt_head, gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n",
		       __func__);
		return -1;
	}
	if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
			 gpt_head, gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid Backup GPT ***\n",
		       __func__);
		return -1;
	}

	return 0;
}

int gpt_verify_partitions(struct blk_desc *dev_desc,
			  disk_partition_t *partitions, int parts,
			  gpt_header *gpt_head, gpt_entry **gpt_pte)
{
	char efi_str[PARTNAME_SZ + 1];
	u64 gpt_part_size;
	gpt_entry *gpt_e;
	int ret, i;

	ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
	if (ret)
		return ret;

	gpt_e = *gpt_pte;

	for (i = 0; i < parts; i++) {
		if (i == gpt_head->num_partition_entries) {
			pr_err("More partitions than allowed!\n");
			return -1;
		}

		/* Check if GPT and ENV partition names match */
		gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
					     PARTNAME_SZ + 1);

		debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
		      __func__, i, efi_str, partitions[i].name);

		if (strncmp(efi_str, (char *)partitions[i].name,
			    sizeof(partitions->name))) {
			pr_err("Partition name: %s does not match %s!\n",
			      efi_str, (char *)partitions[i].name);
			return -1;
		}

		/* Check if GPT and ENV sizes match */
		gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
			le64_to_cpu(gpt_e[i].starting_lba) + 1;
		debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
		      (unsigned long long)gpt_part_size,
		      (unsigned long long)partitions[i].size);

		if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
			/* We do not check the extend partition size */
			if ((i == parts - 1) && (partitions[i].size == 0))
				continue;

			pr_err("Partition %s size: %llu does not match %llu!\n",
			      efi_str, (unsigned long long)gpt_part_size,
			      (unsigned long long)partitions[i].size);
			return -1;
		}

		/*
		 * Start address is optional - check only if provided
		 * in '$partition' variable
		 */
		if (!partitions[i].start) {
			debug("\n");
			continue;
		}

		/* Check if GPT and ENV start LBAs match */
		debug("start LBA - GPT: %8llu, ENV: %8llu\n",
		      le64_to_cpu(gpt_e[i].starting_lba),
		      (unsigned long long)partitions[i].start);

		if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
			pr_err("Partition %s start: %llu does not match %llu!\n",
			      efi_str, le64_to_cpu(gpt_e[i].starting_lba),
			      (unsigned long long)partitions[i].start);
			return -1;
		}
	}

	return 0;
}

int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
{
	gpt_header *gpt_h;
	gpt_entry *gpt_e;

	/* determine start of GPT Header in the buffer */
	gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
		       dev_desc->blksz);
	if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
				dev_desc->lba))
		return -1;

	/* determine start of GPT Entries in the buffer */
	gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
		       dev_desc->blksz);
	if (validate_gpt_entries(gpt_h, gpt_e))
		return -1;

	return 0;
}

int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
{
	gpt_header *gpt_h;
	gpt_entry *gpt_e;
	int gpt_e_blk_cnt;
	lbaint_t lba;
	int cnt;

	if (is_valid_gpt_buf(dev_desc, buf))
		return -1;

	/* determine start of GPT Header in the buffer */
	gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
		       dev_desc->blksz);

	/* determine start of GPT Entries in the buffer */
	gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
		       dev_desc->blksz);
	gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
				   le32_to_cpu(gpt_h->sizeof_partition_entry)),
				  dev_desc);

	/* write MBR */
	lba = 0;	/* MBR is always at 0 */
	cnt = 1;	/* MBR (1 block) */
	if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
		       __func__, "MBR", cnt, lba);
		return 1;
	}

	/* write Primary GPT */
	lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
	cnt = 1;	/* GPT Header (1 block) */
	if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
		       __func__, "Primary GPT Header", cnt, lba);
		return 1;
	}

	lba = le64_to_cpu(gpt_h->partition_entry_lba);
	cnt = gpt_e_blk_cnt;
	if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
		       __func__, "Primary GPT Entries", cnt, lba);
		return 1;
	}

	prepare_backup_gpt_header(gpt_h);

	/* write Backup GPT */
	lba = le64_to_cpu(gpt_h->partition_entry_lba);
	cnt = gpt_e_blk_cnt;
	if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
		       __func__, "Backup GPT Entries", cnt, lba);
		return 1;
	}

	lba = le64_to_cpu(gpt_h->my_lba);
	cnt = 1;	/* GPT Header (1 block) */
	if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
		       __func__, "Backup GPT Header", cnt, lba);
		return 1;
	}

	return 0;
}
#endif

/*
 * Private functions
 */
/*
 * pmbr_part_valid(): Check for EFI partition signature
 *
 * Returns: 1 if EFI GPT partition type is found.
 */
static int pmbr_part_valid(struct partition *part)
{
	if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
		get_unaligned_le32(&part->start_sect) == 1UL) {
		return 1;
	}

	return 0;
}

/*
 * is_pmbr_valid(): test Protective MBR for validity
 *
 * Returns: 1 if PMBR is valid, 0 otherwise.
 * Validity depends on two things:
 *  1) MSDOS signature is in the last two bytes of the MBR
 *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 */
static int is_pmbr_valid(legacy_mbr * mbr)
{
	int i = 0;

	if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
		return 0;

	for (i = 0; i < 4; i++) {
		if (pmbr_part_valid(&mbr->partition_record[i])) {
			return 1;
		}
	}
	return 0;
}

/**
 * is_gpt_valid() - tests one GPT header and PTEs for validity
 *
 * lba is the logical block address of the GPT header to test
 * gpt is a GPT header ptr, filled on return.
 * ptes is a PTEs ptr, filled on return.
 *
 * Description: returns 1 if valid,  0 on error.
 * If valid, returns pointers to PTEs.
 */
static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
			gpt_header *pgpt_head, gpt_entry **pgpt_pte)
{
	/* Confirm valid arguments prior to allocation. */
	if (!dev_desc || !pgpt_head) {
		printf("%s: Invalid Argument(s)\n", __func__);
		return 0;
	}

	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);

	/* Read MBR Header from device */
	if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
		printf("*** ERROR: Can't read MBR header ***\n");
		return 0;
	}

	/* Read GPT Header from device */
	if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
		printf("*** ERROR: Can't read GPT header ***\n");
		return 0;
	}

	if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
		return 0;

	if (dev_desc->sig_type == SIG_TYPE_NONE) {
		efi_guid_t empty = {};
		if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
			dev_desc->sig_type = SIG_TYPE_GUID;
			memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
			      sizeof(empty));
		} else if (mbr->unique_mbr_signature != 0) {
			dev_desc->sig_type = SIG_TYPE_MBR;
			dev_desc->mbr_sig = mbr->unique_mbr_signature;
		}
	}

	/* Read and allocate Partition Table Entries */
	*pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
	if (*pgpt_pte == NULL) {
		printf("GPT: Failed to allocate memory for PTE\n");
		return 0;
	}

	if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
		free(*pgpt_pte);
		return 0;
	}

	/* We're done, all's well */
	return 1;
}

/**
 * alloc_read_gpt_entries(): reads partition entries from disk
 * @dev_desc
 * @gpt - GPT header
 *
 * Description: Returns ptes on success,  NULL on error.
 * Allocates space for PTEs based on information found in @gpt.
 * Notes: remember to free pte when you're done!
 */
static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
					 gpt_header *pgpt_head)
{
	size_t count = 0, blk_cnt;
	lbaint_t blk;
	gpt_entry *pte = NULL;

	if (!dev_desc || !pgpt_head) {
		printf("%s: Invalid Argument(s)\n", __func__);
		return NULL;
	}

	count = le32_to_cpu(pgpt_head->num_partition_entries) *
		le32_to_cpu(pgpt_head->sizeof_partition_entry);

	debug("%s: count = %u * %u = %lu\n", __func__,
	      (u32) le32_to_cpu(pgpt_head->num_partition_entries),
	      (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
	      (ulong)count);

	/* Allocate memory for PTE, remember to FREE */
	if (count != 0) {
		pte = memalign(ARCH_DMA_MINALIGN,
			       PAD_TO_BLOCKSIZE(count, dev_desc));
	}

	if (count == 0 || pte == NULL) {
		printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
		       __func__, (ulong)count);
		return NULL;
	}

	/* Read GPT Entries from device */
	blk = le64_to_cpu(pgpt_head->partition_entry_lba);
	blk_cnt = BLOCK_CNT(count, dev_desc);
	if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
		printf("*** ERROR: Can't read GPT Entries ***\n");
		free(pte);
		return NULL;
	}
	return pte;
}

/**
 * is_pte_valid(): validates a single Partition Table Entry
 * @gpt_entry - Pointer to a single Partition Table Entry
 *
 * Description: returns 1 if valid,  0 on error.
 */
static int is_pte_valid(gpt_entry * pte)
{
	efi_guid_t unused_guid;

	if (!pte) {
		printf("%s: Invalid Argument(s)\n", __func__);
		return 0;
	}

	/* Only one validation for now:
	 * The GUID Partition Type != Unused Entry (ALL-ZERO)
	 */
	memset(unused_guid.b, 0, sizeof(unused_guid.b));

	if (memcmp(pte->partition_type_guid.b, unused_guid.b,
		sizeof(unused_guid.b)) == 0) {

		debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
		      (unsigned int)(uintptr_t)pte);

		return 0;
	} else {
		return 1;
	}
}

/*
 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
 * check EFI first, since a DOS partition is often used as a 'protective MBR'
 * with EFI.
 */
U_BOOT_PART_TYPE(a_efi) = {
	.name		= "EFI",
	.part_type	= PART_TYPE_EFI,
	.max_entries	= GPT_ENTRY_NUMBERS,
	.get_info	= part_get_info_ptr(part_get_info_efi),
	.print		= part_print_ptr(part_print_efi),
	.test		= part_test_efi,
};
#endif