1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2008 RuggedCom, Inc.
4 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
5 */
6
7 /*
8 * NOTE:
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
11 */
12 #include <asm/unaligned.h>
13 #include <common.h>
14 #include <command.h>
15 #include <fdtdec.h>
16 #include <ide.h>
17 #include <inttypes.h>
18 #include <malloc.h>
19 #include <memalign.h>
20 #include <part_efi.h>
21 #include <linux/compiler.h>
22 #include <linux/ctype.h>
23
24 DECLARE_GLOBAL_DATA_PTR;
25
26 /*
27 * GUID for basic data partions.
28 */
29 static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
30
31 #ifdef CONFIG_HAVE_BLOCK_DEVICE
32 /**
33 * efi_crc32() - EFI version of crc32 function
34 * @buf: buffer to calculate crc32 of
35 * @len - length of buf
36 *
37 * Description: Returns EFI-style CRC32 value for @buf
38 */
efi_crc32(const void * buf,u32 len)39 static inline u32 efi_crc32(const void *buf, u32 len)
40 {
41 return crc32(0, buf, len);
42 }
43
44 /*
45 * Private function prototypes
46 */
47
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
print_efiname(gpt_entry * pte)56 static char *print_efiname(gpt_entry *pte)
57 {
58 static char name[PARTNAME_SZ + 1];
59 int i;
60 for (i = 0; i < PARTNAME_SZ; i++) {
61 u8 c;
62 c = pte->partition_name[i] & 0xff;
63 c = (c && !isprint(c)) ? '.' : c;
64 name[i] = c;
65 }
66 name[PARTNAME_SZ] = 0;
67 return name;
68 }
69
70 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
71
is_bootable(gpt_entry * p)72 static inline int is_bootable(gpt_entry *p)
73 {
74 return p->attributes.fields.legacy_bios_bootable ||
75 !memcmp(&(p->partition_type_guid), &system_guid,
76 sizeof(efi_guid_t));
77 }
78
validate_gpt_header(gpt_header * gpt_h,lbaint_t lba,lbaint_t lastlba)79 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
80 lbaint_t lastlba)
81 {
82 uint32_t crc32_backup = 0;
83 uint32_t calc_crc32;
84
85 /* Check the GPT header signature */
86 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
87 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
88 "GUID Partition Table Header",
89 le64_to_cpu(gpt_h->signature),
90 GPT_HEADER_SIGNATURE);
91 return -1;
92 }
93
94 /* Check the GUID Partition Table CRC */
95 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
96 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
97
98 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
99 le32_to_cpu(gpt_h->header_size));
100
101 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
102
103 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
104 printf("%s CRC is wrong: 0x%x != 0x%x\n",
105 "GUID Partition Table Header",
106 le32_to_cpu(crc32_backup), calc_crc32);
107 return -1;
108 }
109
110 /*
111 * Check that the my_lba entry points to the LBA that contains the GPT
112 */
113 if (le64_to_cpu(gpt_h->my_lba) != lba) {
114 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
115 le64_to_cpu(gpt_h->my_lba),
116 lba);
117 return -1;
118 }
119
120 /*
121 * Check that the first_usable_lba and that the last_usable_lba are
122 * within the disk.
123 */
124 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
125 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
126 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
127 return -1;
128 }
129 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
130 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
131 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
132 return -1;
133 }
134
135 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
136 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
137 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
138
139 return 0;
140 }
141
validate_gpt_entries(gpt_header * gpt_h,gpt_entry * gpt_e)142 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
143 {
144 uint32_t calc_crc32;
145
146 /* Check the GUID Partition Table Entry Array CRC */
147 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
148 le32_to_cpu(gpt_h->num_partition_entries) *
149 le32_to_cpu(gpt_h->sizeof_partition_entry));
150
151 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
152 printf("%s: 0x%x != 0x%x\n",
153 "GUID Partition Table Entry Array CRC is wrong",
154 le32_to_cpu(gpt_h->partition_entry_array_crc32),
155 calc_crc32);
156 return -1;
157 }
158
159 return 0;
160 }
161
prepare_backup_gpt_header(gpt_header * gpt_h)162 static void prepare_backup_gpt_header(gpt_header *gpt_h)
163 {
164 uint32_t calc_crc32;
165 uint64_t val;
166
167 /* recalculate the values for the Backup GPT Header */
168 val = le64_to_cpu(gpt_h->my_lba);
169 gpt_h->my_lba = gpt_h->alternate_lba;
170 gpt_h->alternate_lba = cpu_to_le64(val);
171 gpt_h->partition_entry_lba =
172 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
173 gpt_h->header_crc32 = 0;
174
175 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
176 le32_to_cpu(gpt_h->header_size));
177 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
178 }
179
180 #if CONFIG_IS_ENABLED(EFI_PARTITION)
181 /*
182 * Public Functions (include/part.h)
183 */
184
185 /*
186 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
187 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
188 */
get_disk_guid(struct blk_desc * dev_desc,char * guid)189 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
190 {
191 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
192 gpt_entry *gpt_pte = NULL;
193 unsigned char *guid_bin;
194
195 /* This function validates AND fills in the GPT header and PTE */
196 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
197 gpt_head, &gpt_pte) != 1) {
198 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
199 if (is_gpt_valid(dev_desc, dev_desc->lba - 1,
200 gpt_head, &gpt_pte) != 1) {
201 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
202 __func__);
203 return -EINVAL;
204 } else {
205 printf("%s: *** Using Backup GPT ***\n",
206 __func__);
207 }
208 }
209
210 guid_bin = gpt_head->disk_guid.b;
211 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
212
213 return 0;
214 }
215
part_print_efi(struct blk_desc * dev_desc)216 void part_print_efi(struct blk_desc *dev_desc)
217 {
218 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
219 gpt_entry *gpt_pte = NULL;
220 int i = 0;
221 char uuid[UUID_STR_LEN + 1];
222 unsigned char *uuid_bin;
223
224 /* This function validates AND fills in the GPT header and PTE */
225 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
226 gpt_head, &gpt_pte) != 1) {
227 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
228 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
229 gpt_head, &gpt_pte) != 1) {
230 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
231 __func__);
232 return;
233 } else {
234 printf("%s: *** Using Backup GPT ***\n",
235 __func__);
236 }
237 }
238
239 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
240
241 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
242 printf("\tAttributes\n");
243 printf("\tType GUID\n");
244 printf("\tPartition GUID\n");
245
246 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
247 /* Stop at the first non valid PTE */
248 if (!is_pte_valid(&gpt_pte[i]))
249 break;
250
251 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
252 le64_to_cpu(gpt_pte[i].starting_lba),
253 le64_to_cpu(gpt_pte[i].ending_lba),
254 print_efiname(&gpt_pte[i]));
255 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
256 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
257 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
258 printf("\ttype:\t%s\n", uuid);
259 #ifdef CONFIG_PARTITION_TYPE_GUID
260 if (!uuid_guid_get_str(uuid_bin, uuid))
261 printf("\ttype:\t%s\n", uuid);
262 #endif
263 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
264 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
265 printf("\tguid:\t%s\n", uuid);
266 }
267
268 /* Remember to free pte */
269 free(gpt_pte);
270 return;
271 }
272
part_get_info_efi(struct blk_desc * dev_desc,int part,disk_partition_t * info)273 int part_get_info_efi(struct blk_desc *dev_desc, int part,
274 disk_partition_t *info)
275 {
276 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
277 gpt_entry *gpt_pte = NULL;
278
279 /* "part" argument must be at least 1 */
280 if (part < 1) {
281 printf("%s: Invalid Argument(s)\n", __func__);
282 return -1;
283 }
284
285 /* This function validates AND fills in the GPT header and PTE */
286 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
287 gpt_head, &gpt_pte) != 1) {
288 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
289 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
290 gpt_head, &gpt_pte) != 1) {
291 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
292 __func__);
293 return -1;
294 } else {
295 printf("%s: *** Using Backup GPT ***\n",
296 __func__);
297 }
298 }
299
300 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
301 !is_pte_valid(&gpt_pte[part - 1])) {
302 debug("%s: *** ERROR: Invalid partition number %d ***\n",
303 __func__, part);
304 free(gpt_pte);
305 return -1;
306 }
307
308 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
309 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
310 /* The ending LBA is inclusive, to calculate size, add 1 to it */
311 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
312 - info->start;
313 info->blksz = dev_desc->blksz;
314
315 sprintf((char *)info->name, "%s",
316 print_efiname(&gpt_pte[part - 1]));
317 strcpy((char *)info->type, "U-Boot");
318 info->bootable = is_bootable(&gpt_pte[part - 1]);
319 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
320 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
321 UUID_STR_FORMAT_GUID);
322 #endif
323 #ifdef CONFIG_PARTITION_TYPE_GUID
324 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
325 info->type_guid, UUID_STR_FORMAT_GUID);
326 #endif
327
328 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
329 info->start, info->size, info->name);
330
331 /* Remember to free pte */
332 free(gpt_pte);
333 return 0;
334 }
335
part_test_efi(struct blk_desc * dev_desc)336 static int part_test_efi(struct blk_desc *dev_desc)
337 {
338 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
339
340 /* Read legacy MBR from block 0 and validate it */
341 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
342 || (is_pmbr_valid(legacymbr) != 1)) {
343 return -1;
344 }
345 return 0;
346 }
347
348 /**
349 * set_protective_mbr(): Set the EFI protective MBR
350 * @param dev_desc - block device descriptor
351 *
352 * @return - zero on success, otherwise error
353 */
set_protective_mbr(struct blk_desc * dev_desc)354 static int set_protective_mbr(struct blk_desc *dev_desc)
355 {
356 /* Setup the Protective MBR */
357 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz);
358 if (p_mbr == NULL) {
359 printf("%s: calloc failed!\n", __func__);
360 return -1;
361 }
362
363 /* Read MBR to backup boot code if it exists */
364 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
365 pr_err("** Can't read from device %d **\n", dev_desc->devnum);
366 return -1;
367 }
368
369 /* Clear all data in MBR except of backed up boot code */
370 memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
371 MSDOS_MBR_BOOT_CODE_SIZE);
372
373 /* Append signature */
374 p_mbr->signature = MSDOS_MBR_SIGNATURE;
375 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
376 p_mbr->partition_record[0].start_sect = 1;
377 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
378
379 /* Write MBR sector to the MMC device */
380 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
381 printf("** Can't write to device %d **\n",
382 dev_desc->devnum);
383 return -1;
384 }
385
386 return 0;
387 }
388
write_gpt_table(struct blk_desc * dev_desc,gpt_header * gpt_h,gpt_entry * gpt_e)389 int write_gpt_table(struct blk_desc *dev_desc,
390 gpt_header *gpt_h, gpt_entry *gpt_e)
391 {
392 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
393 * sizeof(gpt_entry)), dev_desc);
394 u32 calc_crc32;
395
396 debug("max lba: %x\n", (u32) dev_desc->lba);
397 /* Setup the Protective MBR */
398 if (set_protective_mbr(dev_desc) < 0)
399 goto err;
400
401 /* Generate CRC for the Primary GPT Header */
402 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
403 le32_to_cpu(gpt_h->num_partition_entries) *
404 le32_to_cpu(gpt_h->sizeof_partition_entry));
405 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
406
407 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
408 le32_to_cpu(gpt_h->header_size));
409 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
410
411 /* Write the First GPT to the block right after the Legacy MBR */
412 if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
413 goto err;
414
415 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
416 pte_blk_cnt, gpt_e) != pte_blk_cnt)
417 goto err;
418
419 prepare_backup_gpt_header(gpt_h);
420
421 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
422 + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
423 goto err;
424
425 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
426 gpt_h) != 1)
427 goto err;
428
429 debug("GPT successfully written to block device!\n");
430 return 0;
431
432 err:
433 printf("** Can't write to device %d **\n", dev_desc->devnum);
434 return -1;
435 }
436
gpt_fill_pte(struct blk_desc * dev_desc,gpt_header * gpt_h,gpt_entry * gpt_e,disk_partition_t * partitions,int parts)437 int gpt_fill_pte(struct blk_desc *dev_desc,
438 gpt_header *gpt_h, gpt_entry *gpt_e,
439 disk_partition_t *partitions, int parts)
440 {
441 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
442 lbaint_t last_usable_lba = (lbaint_t)
443 le64_to_cpu(gpt_h->last_usable_lba);
444 int i, k;
445 size_t efiname_len, dosname_len;
446 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
447 char *str_uuid;
448 unsigned char *bin_uuid;
449 #endif
450 #ifdef CONFIG_PARTITION_TYPE_GUID
451 char *str_type_guid;
452 unsigned char *bin_type_guid;
453 #endif
454 size_t hdr_start = gpt_h->my_lba;
455 size_t hdr_end = hdr_start + 1;
456
457 size_t pte_start = gpt_h->partition_entry_lba;
458 size_t pte_end = pte_start +
459 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
460 dev_desc->blksz;
461
462 for (i = 0; i < parts; i++) {
463 /* partition starting lba */
464 lbaint_t start = partitions[i].start;
465 lbaint_t size = partitions[i].size;
466
467 if (start) {
468 offset = start + size;
469 } else {
470 start = offset;
471 offset += size;
472 }
473
474 /*
475 * If our partition overlaps with either the GPT
476 * header, or the partition entry, reject it.
477 */
478 if (((start < hdr_end && hdr_start < (start + size)) ||
479 (start < pte_end && pte_start < (start + size)))) {
480 printf("Partition overlap\n");
481 return -1;
482 }
483
484 gpt_e[i].starting_lba = cpu_to_le64(start);
485
486 if (offset > (last_usable_lba + 1)) {
487 printf("Partitions layout exceds disk size\n");
488 return -1;
489 }
490 /* partition ending lba */
491 if ((i == parts - 1) && (size == 0))
492 /* extend the last partition to maximuim */
493 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
494 else
495 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
496
497 #ifdef CONFIG_PARTITION_TYPE_GUID
498 str_type_guid = partitions[i].type_guid;
499 bin_type_guid = gpt_e[i].partition_type_guid.b;
500 if (strlen(str_type_guid)) {
501 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
502 UUID_STR_FORMAT_GUID)) {
503 printf("Partition no. %d: invalid type guid: %s\n",
504 i, str_type_guid);
505 return -1;
506 }
507 } else {
508 /* default partition type GUID */
509 memcpy(bin_type_guid,
510 &partition_basic_data_guid, 16);
511 }
512 #else
513 /* partition type GUID */
514 memcpy(gpt_e[i].partition_type_guid.b,
515 &partition_basic_data_guid, 16);
516 #endif
517
518 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
519 str_uuid = partitions[i].uuid;
520 bin_uuid = gpt_e[i].unique_partition_guid.b;
521
522 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
523 printf("Partition no. %d: invalid guid: %s\n",
524 i, str_uuid);
525 return -1;
526 }
527 #endif
528
529 /* partition attributes */
530 memset(&gpt_e[i].attributes, 0,
531 sizeof(gpt_entry_attributes));
532
533 if (partitions[i].bootable)
534 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
535
536 /* partition name */
537 efiname_len = sizeof(gpt_e[i].partition_name)
538 / sizeof(efi_char16_t);
539 dosname_len = sizeof(partitions[i].name);
540
541 memset(gpt_e[i].partition_name, 0,
542 sizeof(gpt_e[i].partition_name));
543
544 for (k = 0; k < min(dosname_len, efiname_len); k++)
545 gpt_e[i].partition_name[k] =
546 (efi_char16_t)(partitions[i].name[k]);
547
548 debug("%s: name: %s offset[%d]: 0x" LBAF
549 " size[%d]: 0x" LBAF "\n",
550 __func__, partitions[i].name, i,
551 offset, i, size);
552 }
553
554 return 0;
555 }
556
partition_entries_offset(struct blk_desc * dev_desc)557 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
558 {
559 uint32_t offset_blks = 2;
560 uint32_t __maybe_unused offset_bytes;
561 int __maybe_unused config_offset;
562
563 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
564 /*
565 * Some architectures require their SPL loader at a fixed
566 * address within the first 16KB of the disk. To avoid an
567 * overlap with the partition entries of the EFI partition
568 * table, the first safe offset (in bytes, from the start of
569 * the disk) for the entries can be set in
570 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
571 */
572 offset_bytes =
573 PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
574 offset_blks = offset_bytes / dev_desc->blksz;
575 #endif
576
577 #if defined(CONFIG_OF_CONTROL)
578 /*
579 * Allow the offset of the first partition entires (in bytes
580 * from the start of the device) to be specified as a property
581 * of the device tree '/config' node.
582 */
583 config_offset = fdtdec_get_config_int(gd->fdt_blob,
584 "u-boot,efi-partition-entries-offset",
585 -EINVAL);
586 if (config_offset != -EINVAL) {
587 offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
588 offset_blks = offset_bytes / dev_desc->blksz;
589 }
590 #endif
591
592 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
593
594 /*
595 * The earliest LBA this can be at is LBA#2 (i.e. right behind
596 * the (protective) MBR and the GPT header.
597 */
598 if (offset_blks < 2)
599 offset_blks = 2;
600
601 return offset_blks;
602 }
603
gpt_fill_header(struct blk_desc * dev_desc,gpt_header * gpt_h,char * str_guid,int parts_count)604 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
605 char *str_guid, int parts_count)
606 {
607 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
608 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
609 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
610 gpt_h->my_lba = cpu_to_le64(1);
611 gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
612 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
613 gpt_h->partition_entry_lba =
614 cpu_to_le64(partition_entries_offset(dev_desc));
615 gpt_h->first_usable_lba =
616 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
617 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
618 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
619 gpt_h->header_crc32 = 0;
620 gpt_h->partition_entry_array_crc32 = 0;
621
622 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
623 return -1;
624
625 return 0;
626 }
627
gpt_restore(struct blk_desc * dev_desc,char * str_disk_guid,disk_partition_t * partitions,int parts_count)628 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
629 disk_partition_t *partitions, int parts_count)
630 {
631 gpt_header *gpt_h;
632 gpt_entry *gpt_e;
633 int ret, size;
634
635 size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc);
636 gpt_h = malloc_cache_aligned(size);
637 if (gpt_h == NULL) {
638 printf("%s: calloc failed!\n", __func__);
639 return -1;
640 }
641 memset(gpt_h, 0, size);
642
643 size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry),
644 dev_desc);
645 gpt_e = malloc_cache_aligned(size);
646 if (gpt_e == NULL) {
647 printf("%s: calloc failed!\n", __func__);
648 free(gpt_h);
649 return -1;
650 }
651 memset(gpt_e, 0, size);
652
653 /* Generate Primary GPT header (LBA1) */
654 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
655 if (ret)
656 goto err;
657
658 /* Generate partition entries */
659 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
660 if (ret)
661 goto err;
662
663 /* Write GPT partition table */
664 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
665
666 err:
667 free(gpt_e);
668 free(gpt_h);
669 return ret;
670 }
671
gpt_convert_efi_name_to_char(char * s,efi_char16_t * es,int n)672 static void gpt_convert_efi_name_to_char(char *s, efi_char16_t *es, int n)
673 {
674 char *ess = (char *)es;
675 int i, j;
676
677 memset(s, '\0', n);
678
679 for (i = 0, j = 0; j < n; i += 2, j++) {
680 s[j] = ess[i];
681 if (!ess[i])
682 return;
683 }
684 }
685
gpt_verify_headers(struct blk_desc * dev_desc,gpt_header * gpt_head,gpt_entry ** gpt_pte)686 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
687 gpt_entry **gpt_pte)
688 {
689 /*
690 * This function validates AND
691 * fills in the GPT header and PTE
692 */
693 if (is_gpt_valid(dev_desc,
694 GPT_PRIMARY_PARTITION_TABLE_LBA,
695 gpt_head, gpt_pte) != 1) {
696 printf("%s: *** ERROR: Invalid GPT ***\n",
697 __func__);
698 return -1;
699 }
700 if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
701 gpt_head, gpt_pte) != 1) {
702 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
703 __func__);
704 return -1;
705 }
706
707 return 0;
708 }
709
gpt_verify_partitions(struct blk_desc * dev_desc,disk_partition_t * partitions,int parts,gpt_header * gpt_head,gpt_entry ** gpt_pte)710 int gpt_verify_partitions(struct blk_desc *dev_desc,
711 disk_partition_t *partitions, int parts,
712 gpt_header *gpt_head, gpt_entry **gpt_pte)
713 {
714 char efi_str[PARTNAME_SZ + 1];
715 u64 gpt_part_size;
716 gpt_entry *gpt_e;
717 int ret, i;
718
719 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
720 if (ret)
721 return ret;
722
723 gpt_e = *gpt_pte;
724
725 for (i = 0; i < parts; i++) {
726 if (i == gpt_head->num_partition_entries) {
727 pr_err("More partitions than allowed!\n");
728 return -1;
729 }
730
731 /* Check if GPT and ENV partition names match */
732 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
733 PARTNAME_SZ + 1);
734
735 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
736 __func__, i, efi_str, partitions[i].name);
737
738 if (strncmp(efi_str, (char *)partitions[i].name,
739 sizeof(partitions->name))) {
740 pr_err("Partition name: %s does not match %s!\n",
741 efi_str, (char *)partitions[i].name);
742 return -1;
743 }
744
745 /* Check if GPT and ENV sizes match */
746 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
747 le64_to_cpu(gpt_e[i].starting_lba) + 1;
748 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
749 (unsigned long long)gpt_part_size,
750 (unsigned long long)partitions[i].size);
751
752 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
753 /* We do not check the extend partition size */
754 if ((i == parts - 1) && (partitions[i].size == 0))
755 continue;
756
757 pr_err("Partition %s size: %llu does not match %llu!\n",
758 efi_str, (unsigned long long)gpt_part_size,
759 (unsigned long long)partitions[i].size);
760 return -1;
761 }
762
763 /*
764 * Start address is optional - check only if provided
765 * in '$partition' variable
766 */
767 if (!partitions[i].start) {
768 debug("\n");
769 continue;
770 }
771
772 /* Check if GPT and ENV start LBAs match */
773 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
774 le64_to_cpu(gpt_e[i].starting_lba),
775 (unsigned long long)partitions[i].start);
776
777 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
778 pr_err("Partition %s start: %llu does not match %llu!\n",
779 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
780 (unsigned long long)partitions[i].start);
781 return -1;
782 }
783 }
784
785 return 0;
786 }
787
is_valid_gpt_buf(struct blk_desc * dev_desc,void * buf)788 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
789 {
790 gpt_header *gpt_h;
791 gpt_entry *gpt_e;
792
793 /* determine start of GPT Header in the buffer */
794 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
795 dev_desc->blksz);
796 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
797 dev_desc->lba))
798 return -1;
799
800 /* determine start of GPT Entries in the buffer */
801 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
802 dev_desc->blksz);
803 if (validate_gpt_entries(gpt_h, gpt_e))
804 return -1;
805
806 return 0;
807 }
808
write_mbr_and_gpt_partitions(struct blk_desc * dev_desc,void * buf)809 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
810 {
811 gpt_header *gpt_h;
812 gpt_entry *gpt_e;
813 int gpt_e_blk_cnt;
814 lbaint_t lba;
815 int cnt;
816
817 if (is_valid_gpt_buf(dev_desc, buf))
818 return -1;
819
820 /* determine start of GPT Header in the buffer */
821 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
822 dev_desc->blksz);
823
824 /* determine start of GPT Entries in the buffer */
825 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
826 dev_desc->blksz);
827 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
828 le32_to_cpu(gpt_h->sizeof_partition_entry)),
829 dev_desc);
830
831 /* write MBR */
832 lba = 0; /* MBR is always at 0 */
833 cnt = 1; /* MBR (1 block) */
834 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
835 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
836 __func__, "MBR", cnt, lba);
837 return 1;
838 }
839
840 /* write Primary GPT */
841 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
842 cnt = 1; /* GPT Header (1 block) */
843 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
844 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
845 __func__, "Primary GPT Header", cnt, lba);
846 return 1;
847 }
848
849 lba = le64_to_cpu(gpt_h->partition_entry_lba);
850 cnt = gpt_e_blk_cnt;
851 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
852 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
853 __func__, "Primary GPT Entries", cnt, lba);
854 return 1;
855 }
856
857 prepare_backup_gpt_header(gpt_h);
858
859 /* write Backup GPT */
860 lba = le64_to_cpu(gpt_h->partition_entry_lba);
861 cnt = gpt_e_blk_cnt;
862 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
863 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
864 __func__, "Backup GPT Entries", cnt, lba);
865 return 1;
866 }
867
868 lba = le64_to_cpu(gpt_h->my_lba);
869 cnt = 1; /* GPT Header (1 block) */
870 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
871 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
872 __func__, "Backup GPT Header", cnt, lba);
873 return 1;
874 }
875
876 return 0;
877 }
878 #endif
879
880 /*
881 * Private functions
882 */
883 /*
884 * pmbr_part_valid(): Check for EFI partition signature
885 *
886 * Returns: 1 if EFI GPT partition type is found.
887 */
pmbr_part_valid(struct partition * part)888 static int pmbr_part_valid(struct partition *part)
889 {
890 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
891 get_unaligned_le32(&part->start_sect) == 1UL) {
892 return 1;
893 }
894
895 return 0;
896 }
897
898 /*
899 * is_pmbr_valid(): test Protective MBR for validity
900 *
901 * Returns: 1 if PMBR is valid, 0 otherwise.
902 * Validity depends on two things:
903 * 1) MSDOS signature is in the last two bytes of the MBR
904 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
905 */
is_pmbr_valid(legacy_mbr * mbr)906 static int is_pmbr_valid(legacy_mbr * mbr)
907 {
908 int i = 0;
909
910 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
911 return 0;
912
913 for (i = 0; i < 4; i++) {
914 if (pmbr_part_valid(&mbr->partition_record[i])) {
915 return 1;
916 }
917 }
918 return 0;
919 }
920
921 /**
922 * is_gpt_valid() - tests one GPT header and PTEs for validity
923 *
924 * lba is the logical block address of the GPT header to test
925 * gpt is a GPT header ptr, filled on return.
926 * ptes is a PTEs ptr, filled on return.
927 *
928 * Description: returns 1 if valid, 0 on error.
929 * If valid, returns pointers to PTEs.
930 */
is_gpt_valid(struct blk_desc * dev_desc,u64 lba,gpt_header * pgpt_head,gpt_entry ** pgpt_pte)931 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
932 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
933 {
934 /* Confirm valid arguments prior to allocation. */
935 if (!dev_desc || !pgpt_head) {
936 printf("%s: Invalid Argument(s)\n", __func__);
937 return 0;
938 }
939
940 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz);
941
942 /* Read MBR Header from device */
943 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
944 printf("*** ERROR: Can't read MBR header ***\n");
945 return 0;
946 }
947
948 /* Read GPT Header from device */
949 if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
950 printf("*** ERROR: Can't read GPT header ***\n");
951 return 0;
952 }
953
954 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
955 return 0;
956
957 if (dev_desc->sig_type == SIG_TYPE_NONE) {
958 efi_guid_t empty = {};
959 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
960 dev_desc->sig_type = SIG_TYPE_GUID;
961 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
962 sizeof(empty));
963 } else if (mbr->unique_mbr_signature != 0) {
964 dev_desc->sig_type = SIG_TYPE_MBR;
965 dev_desc->mbr_sig = mbr->unique_mbr_signature;
966 }
967 }
968
969 /* Read and allocate Partition Table Entries */
970 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
971 if (*pgpt_pte == NULL) {
972 printf("GPT: Failed to allocate memory for PTE\n");
973 return 0;
974 }
975
976 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
977 free(*pgpt_pte);
978 return 0;
979 }
980
981 /* We're done, all's well */
982 return 1;
983 }
984
985 /**
986 * alloc_read_gpt_entries(): reads partition entries from disk
987 * @dev_desc
988 * @gpt - GPT header
989 *
990 * Description: Returns ptes on success, NULL on error.
991 * Allocates space for PTEs based on information found in @gpt.
992 * Notes: remember to free pte when you're done!
993 */
alloc_read_gpt_entries(struct blk_desc * dev_desc,gpt_header * pgpt_head)994 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
995 gpt_header *pgpt_head)
996 {
997 size_t count = 0, blk_cnt;
998 lbaint_t blk;
999 gpt_entry *pte = NULL;
1000
1001 if (!dev_desc || !pgpt_head) {
1002 printf("%s: Invalid Argument(s)\n", __func__);
1003 return NULL;
1004 }
1005
1006 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1007 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1008
1009 debug("%s: count = %u * %u = %lu\n", __func__,
1010 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
1011 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
1012 (ulong)count);
1013
1014 /* Allocate memory for PTE, remember to FREE */
1015 if (count != 0) {
1016 pte = memalign(ARCH_DMA_MINALIGN,
1017 PAD_TO_BLOCKSIZE(count, dev_desc));
1018 }
1019
1020 if (count == 0 || pte == NULL) {
1021 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1022 __func__, (ulong)count);
1023 return NULL;
1024 }
1025
1026 /* Read GPT Entries from device */
1027 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1028 blk_cnt = BLOCK_CNT(count, dev_desc);
1029 if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1030 printf("*** ERROR: Can't read GPT Entries ***\n");
1031 free(pte);
1032 return NULL;
1033 }
1034 return pte;
1035 }
1036
1037 /**
1038 * is_pte_valid(): validates a single Partition Table Entry
1039 * @gpt_entry - Pointer to a single Partition Table Entry
1040 *
1041 * Description: returns 1 if valid, 0 on error.
1042 */
is_pte_valid(gpt_entry * pte)1043 static int is_pte_valid(gpt_entry * pte)
1044 {
1045 efi_guid_t unused_guid;
1046
1047 if (!pte) {
1048 printf("%s: Invalid Argument(s)\n", __func__);
1049 return 0;
1050 }
1051
1052 /* Only one validation for now:
1053 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1054 */
1055 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1056
1057 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1058 sizeof(unused_guid.b)) == 0) {
1059
1060 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1061 (unsigned int)(uintptr_t)pte);
1062
1063 return 0;
1064 } else {
1065 return 1;
1066 }
1067 }
1068
1069 /*
1070 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1071 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1072 * with EFI.
1073 */
1074 U_BOOT_PART_TYPE(a_efi) = {
1075 .name = "EFI",
1076 .part_type = PART_TYPE_EFI,
1077 .max_entries = GPT_ENTRY_NUMBERS,
1078 .get_info = part_get_info_ptr(part_get_info_efi),
1079 .print = part_print_ptr(part_print_efi),
1080 .test = part_test_efi,
1081 };
1082 #endif
1083