1 /*
2 * Copyright (C) 2008 RuggedCom, Inc.
3 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 /*
9 * NOTE:
10 * when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
11 * limits the maximum size of addressable storage to < 2 Terra Bytes
12 */
13 #include <asm/unaligned.h>
14 #include <common.h>
15 #include <command.h>
16 #include <fdtdec.h>
17 #include <ide.h>
18 #include <inttypes.h>
19 #include <malloc.h>
20 #include <memalign.h>
21 #include <part_efi.h>
22 #include <linux/compiler.h>
23 #include <linux/ctype.h>
24
25 DECLARE_GLOBAL_DATA_PTR;
26
27 #ifdef HAVE_BLOCK_DEVICE
28 /**
29 * efi_crc32() - EFI version of crc32 function
30 * @buf: buffer to calculate crc32 of
31 * @len - length of buf
32 *
33 * Description: Returns EFI-style CRC32 value for @buf
34 */
efi_crc32(const void * buf,u32 len)35 static inline u32 efi_crc32(const void *buf, u32 len)
36 {
37 return crc32(0, buf, len);
38 }
39
40 /*
41 * Private function prototypes
42 */
43
44 static int pmbr_part_valid(struct partition *part);
45 static int is_pmbr_valid(legacy_mbr * mbr);
46 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
47 gpt_header *pgpt_head, gpt_entry **pgpt_pte);
48 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
49 gpt_header *pgpt_head);
50 static int is_pte_valid(gpt_entry * pte);
51
print_efiname(gpt_entry * pte)52 static char *print_efiname(gpt_entry *pte)
53 {
54 static char name[PARTNAME_SZ + 1];
55 int i;
56 for (i = 0; i < PARTNAME_SZ; i++) {
57 u8 c;
58 c = pte->partition_name[i] & 0xff;
59 c = (c && !isprint(c)) ? '.' : c;
60 name[i] = c;
61 }
62 name[PARTNAME_SZ] = 0;
63 return name;
64 }
65
66 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
67
is_bootable(gpt_entry * p)68 static inline int is_bootable(gpt_entry *p)
69 {
70 return p->attributes.fields.legacy_bios_bootable ||
71 !memcmp(&(p->partition_type_guid), &system_guid,
72 sizeof(efi_guid_t));
73 }
74
75 #define FACTORY_UNKNOWN_LBA (0xffffffff - 34)
validate_gpt_header(gpt_header * gpt_h,lbaint_t lba,lbaint_t lastlba)76 static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
77 lbaint_t lastlba)
78 {
79 uint32_t crc32_backup = 0;
80 uint32_t calc_crc32;
81
82 /* Check the GPT header signature */
83 if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE) {
84 if (le64_to_cpu(gpt_h->signature) != 0)
85 printf("%s signature is wrong: 0x%llX != 0x%llX\n",
86 "GUID Partition Table Header",
87 le64_to_cpu(gpt_h->signature),
88 GPT_HEADER_SIGNATURE);
89 return -1;
90 }
91
92 /* Check the GUID Partition Table CRC */
93 memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
94 memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
95
96 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
97 le32_to_cpu(gpt_h->header_size));
98
99 memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
100
101 if (calc_crc32 != le32_to_cpu(crc32_backup)) {
102 printf("%s CRC is wrong: 0x%x != 0x%x\n",
103 "GUID Partition Table Header",
104 le32_to_cpu(crc32_backup), calc_crc32);
105 return -1;
106 }
107
108 /*
109 * Check that the my_lba entry points to the LBA that contains the GPT
110 */
111 if (le64_to_cpu(gpt_h->my_lba) != lba) {
112 printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
113 le64_to_cpu(gpt_h->my_lba),
114 lba);
115 return -1;
116 }
117
118 /*
119 * Check that the first_usable_lba and that the last_usable_lba are
120 * within the disk.
121 */
122 if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
123 printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
124 le64_to_cpu(gpt_h->first_usable_lba), lastlba);
125 return -1;
126 }
127 if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
128 if (le64_to_cpu(gpt_h->last_usable_lba) == FACTORY_UNKNOWN_LBA) {
129 #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_KERNEL_BOOT)
130 printf("GPT: SPL workaround factory last_usable_lba\n");
131 gpt_h->last_usable_lba = lastlba - 34;
132 return 0;
133 #else
134 printf("GPT: last_usable_lba need repair\n");
135 return 0;
136 #endif
137 }
138 printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
139 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
140 return -1;
141 }
142
143 debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
144 LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
145 le64_to_cpu(gpt_h->last_usable_lba), lastlba);
146
147 return 0;
148 }
149
validate_gpt_entries(gpt_header * gpt_h,gpt_entry * gpt_e)150 static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
151 {
152 uint32_t calc_crc32;
153
154 /* Check the GUID Partition Table Entry Array CRC */
155 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
156 le32_to_cpu(gpt_h->num_partition_entries) *
157 le32_to_cpu(gpt_h->sizeof_partition_entry));
158
159 if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
160 printf("%s: 0x%x != 0x%x\n",
161 "GUID Partition Table Entry Array CRC is wrong",
162 le32_to_cpu(gpt_h->partition_entry_array_crc32),
163 calc_crc32);
164 return -1;
165 }
166
167 return 0;
168 }
169
prepare_backup_gpt_header(gpt_header * gpt_h)170 static void prepare_backup_gpt_header(gpt_header *gpt_h)
171 {
172 uint32_t calc_crc32;
173 uint64_t val;
174
175 /* recalculate the values for the Backup GPT Header */
176 val = le64_to_cpu(gpt_h->my_lba);
177 gpt_h->my_lba = gpt_h->alternate_lba;
178 gpt_h->alternate_lba = cpu_to_le64(val);
179 gpt_h->partition_entry_lba =
180 cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
181 gpt_h->header_crc32 = 0;
182
183 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
184 le32_to_cpu(gpt_h->header_size));
185 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
186 }
187
188 #if CONFIG_IS_ENABLED(EFI_PARTITION)
189 /*
190 * Public Functions (include/part.h)
191 */
192
193 /*
194 * UUID is displayed as 32 hexadecimal digits, in 5 groups,
195 * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
196 */
get_disk_guid(struct blk_desc * dev_desc,char * guid)197 int get_disk_guid(struct blk_desc * dev_desc, char *guid)
198 {
199 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->rawblksz);
200 gpt_entry *gpt_pte = NULL;
201 unsigned char *guid_bin;
202
203 /* This function validates AND fills in the GPT header and PTE */
204 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
205 gpt_head, &gpt_pte) != 1) {
206 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
207 if (is_gpt_valid(dev_desc, dev_desc->rawlba - 1,
208 gpt_head, &gpt_pte) != 1) {
209 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
210 __func__);
211 return -EINVAL;
212 } else {
213 printf("%s: *** Using Backup GPT ***\n",
214 __func__);
215 }
216 }
217
218 guid_bin = gpt_head->disk_guid.b;
219 uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
220
221 return 0;
222 }
223
part_print_efi(struct blk_desc * dev_desc)224 void part_print_efi(struct blk_desc *dev_desc)
225 {
226 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->rawblksz);
227 gpt_entry *gpt_pte = NULL;
228 int i = 0;
229 char uuid[UUID_STR_LEN + 1];
230 unsigned char *uuid_bin;
231 int sector;
232
233 /* This function validates AND fills in the GPT header and PTE */
234 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
235 gpt_head, &gpt_pte) != 1) {
236 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
237 if (is_gpt_valid(dev_desc, (dev_desc->rawlba - 1),
238 gpt_head, &gpt_pte) != 1) {
239 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
240 __func__);
241 return;
242 } else {
243 printf("%s: *** Using Backup GPT ***\n",
244 __func__);
245 }
246 }
247
248 debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
249
250 printf("Part\tStart LBA\tEnd LBA\t\tName\n");
251 printf("\tAttributes\n");
252 printf("\tType GUID\n");
253 printf("\tPartition GUID\n");
254
255 sector = dev_desc->rawblksz / dev_desc->blksz;
256 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
257 /* Stop at the first non valid PTE */
258 if (!is_pte_valid(&gpt_pte[i]))
259 break;
260
261 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
262 le64_to_cpu(gpt_pte[i].starting_lba * sector),
263 le64_to_cpu(gpt_pte[i].ending_lba * sector + sector - 1),
264 print_efiname(&gpt_pte[i]));
265 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
266 uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
267 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
268 printf("\ttype:\t%s\n", uuid);
269 #ifdef CONFIG_PARTITION_TYPE_GUID
270 if (!uuid_guid_get_str(uuid_bin, uuid))
271 printf("\ttype:\t%s\n", uuid);
272 #endif
273 uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
274 uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
275 printf("\tguid:\t%s\n", uuid);
276 }
277
278 /* Remember to free pte */
279 free(gpt_pte);
280 return;
281 }
282
part_get_info_efi(struct blk_desc * dev_desc,int part,disk_partition_t * info)283 int part_get_info_efi(struct blk_desc *dev_desc, int part,
284 disk_partition_t *info)
285 {
286 static gpt_entry *gpt_pte = NULL;
287 static gpt_header *gpt_head = NULL;
288 int sector, b_gpt_nsec = 0x22;
289
290 if (!dev_desc->rawblksz || !dev_desc->rawlba) {
291 dev_desc->rawblksz = dev_desc->blksz;
292 dev_desc->rawlba = dev_desc->lba;
293 }
294
295 if (dev_desc->rawblksz == 4096)
296 b_gpt_nsec = 6;
297
298 if (!gpt_head)
299 gpt_head = memalign(ARCH_DMA_MINALIGN, dev_desc->rawblksz);
300
301 /*
302 * We suppose different dev have different size, eg. emmc vs sd
303 * free the pte first if exist and then will malloc and init a new one.
304 */
305 if (gpt_head && (gpt_head->last_usable_lba + b_gpt_nsec) != dev_desc->rawlba) {
306 if (dev_desc->rawblksz == 4096) {
307 /* realloc gpt header buffer */
308 free(gpt_head);
309 gpt_head = memalign(ARCH_DMA_MINALIGN, dev_desc->rawblksz);
310 }
311 if (gpt_pte)
312 free(gpt_pte);
313 gpt_pte = NULL;
314 }
315
316 /* "part" argument must be at least 1 */
317 if (part < 1) {
318 printf("%s: Invalid Argument(s)\n", __func__);
319 return -1;
320 }
321
322 /* This function validates AND fills in the GPT header and PTE */
323 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
324 gpt_head, &gpt_pte) != 1) {
325 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
326 if (is_gpt_valid(dev_desc, (dev_desc->rawlba - 1),
327 gpt_head, &gpt_pte) != 1) {
328 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
329 __func__);
330 return -1;
331 } else {
332 printf("%s: *** Using Backup GPT ***\n",
333 __func__);
334 }
335 }
336
337 if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
338 !is_pte_valid(&gpt_pte[part - 1])) {
339 debug("%s: *** ERROR: Invalid partition number %d ***\n",
340 __func__, part);
341 return -1;
342 }
343
344 sector = dev_desc->rawblksz / dev_desc->blksz;
345 /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
346 info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
347 /* The ending LBA is inclusive, to calculate size, add 1 to it */
348 info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
349 - info->start;
350 info->start *= sector;
351 info->size *= sector;
352
353 info->blksz = dev_desc->blksz;
354
355 sprintf((char *)info->name, "%s",
356 print_efiname(&gpt_pte[part - 1]));
357 strcpy((char *)info->type, "U-Boot");
358 info->bootable = is_bootable(&gpt_pte[part - 1]);
359 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
360 uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
361 UUID_STR_FORMAT_GUID);
362 #endif
363 #ifdef CONFIG_PARTITION_TYPE_GUID
364 uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
365 info->type_guid, UUID_STR_FORMAT_GUID);
366 #endif
367
368 debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
369 info->start, info->size, info->name);
370
371 return 0;
372 }
373
374 #ifdef CONFIG_RKIMG_BOOTLOADER
375 #if defined(CONFIG_SPL_KERNEL_BOOT) || !defined(CONFIG_SPL_BUILD)
gpt_entry_modify(struct blk_desc * dev_desc,gpt_entry * gpt_pte,gpt_header * gpt_head)376 static void gpt_entry_modify(struct blk_desc *dev_desc,
377 gpt_entry *gpt_pte,
378 gpt_header *gpt_head)
379 {
380 int i;
381 uint32_t calc_crc32;
382
383 for (i = 0; i < gpt_head->num_partition_entries; i++) {
384 if (!is_pte_valid(&gpt_pte[i]))
385 break;
386 }
387 if (dev_desc->rawblksz == 4096) {
388 if (gpt_pte[i - 1].ending_lba <= (dev_desc->rawlba - 6))
389 return;
390 gpt_pte[i - 1].ending_lba = dev_desc->rawlba - 6;
391 } else {
392 if (gpt_pte[i - 1].ending_lba <= (dev_desc->rawlba - 0x22))
393 return;
394 /* The last partition size need align to 4KB, here align to 32KB. */
395 gpt_pte[i - 1].ending_lba = dev_desc->rawlba - 0x41;
396 }
397 calc_crc32 = efi_crc32((const unsigned char *)gpt_pte,
398 le32_to_cpu(gpt_head->num_partition_entries) *
399 le32_to_cpu(gpt_head->sizeof_partition_entry));
400 gpt_head->partition_entry_array_crc32 = calc_crc32;
401 }
402
part_efi_repair(struct blk_desc * dev_desc,gpt_entry * gpt_pte,gpt_header * gpt_head,int head_gpt_valid,int backup_gpt_valid)403 static int part_efi_repair(struct blk_desc *dev_desc, gpt_entry *gpt_pte,
404 gpt_header *gpt_head, int head_gpt_valid,
405 int backup_gpt_valid)
406 {
407 uint32_t calc_crc32;
408 size_t count = 0, blk_cnt;
409 lbaint_t blk;
410 int sector = dev_desc->rawblksz / dev_desc->blksz;
411
412 if (head_gpt_valid == 1 && backup_gpt_valid == 1) {
413 return 0;
414 } else if (head_gpt_valid == 0 && backup_gpt_valid == 0) {
415 return -1;
416 } else if (head_gpt_valid == 1 && backup_gpt_valid == 0) {
417 gpt_head->header_crc32 = 0;
418 gpt_head->my_lba = dev_desc->rawlba - 1;
419 gpt_head->alternate_lba = 1;
420 if (sector == 8) {
421 gpt_head->partition_entry_lba = dev_desc->rawlba - 5;
422 gpt_head->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 6);
423 } else {
424 gpt_head->partition_entry_lba = dev_desc->rawlba - 0x21;
425 gpt_head->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 34);
426 }
427 gpt_entry_modify(dev_desc, gpt_pte, gpt_head);
428 calc_crc32 = efi_crc32((const unsigned char *)gpt_head,
429 le32_to_cpu(gpt_head->header_size));
430 gpt_head->header_crc32 = calc_crc32;
431 blk = le64_to_cpu(dev_desc->rawlba - 1);
432 if (blk_dwrite(dev_desc, blk * sector, sector, gpt_head) != sector) {
433 printf("*** ERROR: Can't write GPT header ***\n");
434 return -1;
435 }
436 count = le32_to_cpu(gpt_head->num_partition_entries) *
437 le32_to_cpu(gpt_head->sizeof_partition_entry);
438 blk = le64_to_cpu(gpt_head->partition_entry_lba);
439 blk_cnt = BLOCK_CNT(count, dev_desc);
440 if (blk_dwrite(dev_desc, blk * sector, (lbaint_t)blk_cnt, gpt_pte) !=
441 blk_cnt) {
442 printf("*** ERROR: Can't write entry partitions ***\n");
443 return -1;
444 }
445 printf("Repair the backup gpt table OK!\n");
446 } else if (head_gpt_valid == 0 && backup_gpt_valid == 1) {
447 gpt_head->header_crc32 = 0;
448 gpt_head->my_lba = 1;
449 gpt_head->alternate_lba = dev_desc->rawlba - 1;
450 gpt_head->partition_entry_lba = 0x2;
451 if (sector == 8) {
452 gpt_head->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 6);
453 } else {
454 gpt_head->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 34);
455 }
456 gpt_entry_modify(dev_desc, gpt_pte, gpt_head);
457 calc_crc32 = efi_crc32((const unsigned char *)gpt_head,
458 le32_to_cpu(gpt_head->header_size));
459 gpt_head->header_crc32 = calc_crc32;
460 if (blk_dwrite(dev_desc, 1 * sector, sector, gpt_head) != sector) {
461 printf("*** ERROR: Can't write GPT header ***\n");
462 /*
463 * Due to the possibility of ECC fail caused by abnormal power
464 * failure in Nand, which affects the blk_dwrite function,
465 * block 0 erasure is introduced to repair the data.
466 */
467 if (dev_desc->if_type == IF_TYPE_MTD &&
468 (dev_desc->devnum == BLK_MTD_NAND || dev_desc->devnum == BLK_MTD_SPI_NAND)) {
469 blk_derase(dev_desc, 0, sector);
470 printf("spinand gpt repair workaround!\n");
471 }
472 return -1;
473 }
474 count = le32_to_cpu(gpt_head->num_partition_entries) *
475 le32_to_cpu(gpt_head->sizeof_partition_entry);
476 blk = le64_to_cpu(gpt_head->partition_entry_lba);
477 blk_cnt = BLOCK_CNT(count, dev_desc);
478 if (blk_dwrite(dev_desc, blk * sector, (lbaint_t)blk_cnt, gpt_pte) !=
479 blk_cnt) {
480 printf("*** ERROR: Can't write entry partitions ***\n");
481 return -1;
482 }
483 printf("Repair the Primary gpt table OK!\n");
484 }
485
486 return 0;
487 }
488 #endif
489 #endif
490
part_test_efi(struct blk_desc * dev_desc)491 static int part_test_efi(struct blk_desc *dev_desc)
492 {
493 int ret = 0;
494
495 if (!dev_desc->rawblksz || !dev_desc->rawlba) {
496 dev_desc->rawblksz = dev_desc->blksz;
497 dev_desc->rawlba = dev_desc->lba;
498 }
499
500 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->rawblksz);
501
502 /* Read legacy MBR from block 0 and validate it */
503 if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
504 || (is_pmbr_valid(legacymbr) != 1)) {
505 return -1;
506 }
507 #ifdef CONFIG_RKIMG_BOOTLOADER
508 #if defined(CONFIG_SPL_KERNEL_BOOT) || !defined(CONFIG_SPL_BUILD)
509 gpt_entry *h_gpt_pte = NULL;
510 gpt_header *h_gpt_head = NULL;
511 gpt_entry *b_gpt_pte = NULL;
512 gpt_header *b_gpt_head = NULL;
513 int head_gpt_valid = 0;
514 int backup_gpt_valid = 0;
515
516 if (!h_gpt_head)
517 h_gpt_head = memalign(ARCH_DMA_MINALIGN, dev_desc->rawblksz);
518 if (!b_gpt_head)
519 b_gpt_head = memalign(ARCH_DMA_MINALIGN, dev_desc->rawblksz);
520
521 head_gpt_valid = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
522 h_gpt_head, &h_gpt_pte);
523 backup_gpt_valid = is_gpt_valid(dev_desc, (dev_desc->rawlba - 1),
524 b_gpt_head, &b_gpt_pte);
525
526 if ((head_gpt_valid == 1) &&
527 (le64_to_cpu(h_gpt_head->last_usable_lba)
528 == FACTORY_UNKNOWN_LBA)) {
529 if (part_efi_repair(dev_desc, h_gpt_pte, h_gpt_head,
530 0, 1))
531 printf("Primary GPT repair fail!\n");
532 /* Force repair backup GPT for factory or ota upgrade. */
533 backup_gpt_valid = 0;
534 }
535
536 if (head_gpt_valid == 1 && backup_gpt_valid == 0) {
537 if (part_efi_repair(dev_desc, h_gpt_pte, h_gpt_head,
538 head_gpt_valid, backup_gpt_valid))
539 printf("Backup GPT repair fail!\n");
540 } else if (head_gpt_valid == 0 && backup_gpt_valid == 1) {
541 if (part_efi_repair(dev_desc, b_gpt_pte, b_gpt_head,
542 head_gpt_valid, backup_gpt_valid))
543 printf("Primary GPT repair fail!\n");
544 } else if (head_gpt_valid == 0 && backup_gpt_valid == 0) {
545 ret = -1;
546 }
547
548 free(h_gpt_pte);
549 h_gpt_pte = NULL;
550 free(h_gpt_head);
551 h_gpt_head = NULL;
552 free(b_gpt_pte);
553 b_gpt_pte = NULL;
554 free(b_gpt_head);
555 b_gpt_head = NULL;
556 #endif
557 #endif
558 return ret;
559 }
560
561 /**
562 * set_protective_mbr(): Set the EFI protective MBR
563 * @param dev_desc - block device descriptor
564 *
565 * @return - zero on success, otherwise error
566 */
set_protective_mbr(struct blk_desc * dev_desc)567 static int set_protective_mbr(struct blk_desc *dev_desc)
568 {
569 /* Setup the Protective MBR */
570 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->rawblksz);
571 memset(p_mbr, 0, dev_desc->rawblksz);
572
573 if (p_mbr == NULL) {
574 printf("%s: calloc failed!\n", __func__);
575 return -1;
576 }
577
578 /* Read MBR to backup boot code if it exists */
579 if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
580 pr_err("** Can't read from device %d **\n", dev_desc->devnum);
581 return -1;
582 }
583
584 /* Append signature */
585 p_mbr->signature = MSDOS_MBR_SIGNATURE;
586 p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
587 p_mbr->partition_record[0].start_sect = 1;
588 p_mbr->partition_record[0].nr_sects = (u32) dev_desc->rawlba - 1;
589
590 /* Write MBR sector to the MMC device */
591 if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
592 printf("** Can't write to device %d **\n",
593 dev_desc->devnum);
594 return -1;
595 }
596
597 return 0;
598 }
599
write_gpt_table(struct blk_desc * dev_desc,gpt_header * gpt_h,gpt_entry * gpt_e)600 int write_gpt_table(struct blk_desc *dev_desc,
601 gpt_header *gpt_h, gpt_entry *gpt_e)
602 {
603 const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
604 * sizeof(gpt_entry)), dev_desc);
605 u32 calc_crc32, sector;
606
607 sector = dev_desc->rawblksz / dev_desc->blksz;
608
609 debug("max lba: %x\n", (u32) dev_desc->rawlba);
610 /* Setup the Protective MBR */
611 if (set_protective_mbr(dev_desc) < 0)
612 goto err;
613
614 /* Generate CRC for the Primary GPT Header */
615 calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
616 le32_to_cpu(gpt_h->num_partition_entries) *
617 le32_to_cpu(gpt_h->sizeof_partition_entry));
618 gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
619
620 calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
621 le32_to_cpu(gpt_h->header_size));
622 gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
623
624 /* Write the First GPT to the block right after the Legacy MBR */
625 if (blk_dwrite(dev_desc, 1 * sector, sector, gpt_h) != sector)
626 goto err;
627
628 if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba * sector),
629 pte_blk_cnt, gpt_e) != pte_blk_cnt)
630 goto err;
631
632 prepare_backup_gpt_header(gpt_h);
633
634 if (blk_dwrite(dev_desc, (lbaint_t)(le64_to_cpu(gpt_h->last_usable_lba)
635 + 1) * sector, pte_blk_cnt, gpt_e) != pte_blk_cnt)
636 goto err;
637
638 if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba) * sector, 1,
639 gpt_h) != 1)
640 goto err;
641
642 debug("GPT successfully written to block device!\n");
643 return 0;
644
645 err:
646 printf("** Can't write to device %d **\n", dev_desc->devnum);
647 return -1;
648 }
649
gpt_fill_pte(struct blk_desc * dev_desc,gpt_header * gpt_h,gpt_entry * gpt_e,disk_partition_t * partitions,int parts)650 int gpt_fill_pte(struct blk_desc *dev_desc,
651 gpt_header *gpt_h, gpt_entry *gpt_e,
652 disk_partition_t *partitions, int parts)
653 {
654 lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
655 lbaint_t last_usable_lba = (lbaint_t)
656 le64_to_cpu(gpt_h->last_usable_lba);
657 int i, k;
658 size_t efiname_len, dosname_len;
659 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
660 char *str_uuid;
661 unsigned char *bin_uuid;
662 #endif
663 #ifdef CONFIG_PARTITION_TYPE_GUID
664 char *str_type_guid;
665 unsigned char *bin_type_guid;
666 #endif
667 size_t hdr_start = gpt_h->my_lba;
668 size_t hdr_end = hdr_start + 1;
669
670 size_t pte_start = gpt_h->partition_entry_lba;
671 size_t pte_end = pte_start +
672 gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
673 dev_desc->rawblksz;
674
675 for (i = 0; i < parts; i++) {
676 /* partition starting lba */
677 lbaint_t start = partitions[i].start;
678 lbaint_t size = partitions[i].size;
679
680 if (start) {
681 offset = start + size;
682 } else {
683 start = offset;
684 offset += size;
685 }
686
687 /*
688 * If our partition overlaps with either the GPT
689 * header, or the partition entry, reject it.
690 */
691 if (((start < hdr_end && hdr_start < (start + size)) ||
692 (start < pte_end && pte_start < (start + size)))) {
693 printf("Partition overlap\n");
694 return -1;
695 }
696
697 gpt_e[i].starting_lba = cpu_to_le64(start);
698
699 if (offset > (last_usable_lba + 1)) {
700 printf("Partitions layout exceds disk size\n");
701 return -1;
702 }
703 /* partition ending lba */
704 if ((i == parts - 1) && (size == 0))
705 /* extend the last partition to maximuim */
706 gpt_e[i].ending_lba = gpt_h->last_usable_lba;
707 else
708 gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
709
710 #ifdef CONFIG_PARTITION_TYPE_GUID
711 str_type_guid = partitions[i].type_guid;
712 bin_type_guid = gpt_e[i].partition_type_guid.b;
713 if (strlen(str_type_guid)) {
714 if (uuid_str_to_bin(str_type_guid, bin_type_guid,
715 UUID_STR_FORMAT_GUID)) {
716 printf("Partition no. %d: invalid type guid: %s\n",
717 i, str_type_guid);
718 return -1;
719 }
720 } else {
721 /* default partition type GUID */
722 memcpy(bin_type_guid,
723 &PARTITION_BASIC_DATA_GUID, 16);
724 }
725 #else
726 /* partition type GUID */
727 memcpy(gpt_e[i].partition_type_guid.b,
728 &PARTITION_BASIC_DATA_GUID, 16);
729 #endif
730
731 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
732 str_uuid = partitions[i].uuid;
733 bin_uuid = gpt_e[i].unique_partition_guid.b;
734
735 if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
736 printf("Partition no. %d: invalid guid: %s\n",
737 i, str_uuid);
738 return -1;
739 }
740 #endif
741
742 /* partition attributes */
743 memset(&gpt_e[i].attributes, 0,
744 sizeof(gpt_entry_attributes));
745
746 if (partitions[i].bootable)
747 gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
748
749 /* partition name */
750 efiname_len = sizeof(gpt_e[i].partition_name)
751 / sizeof(efi_char16_t);
752 dosname_len = sizeof(partitions[i].name);
753
754 memset(gpt_e[i].partition_name, 0,
755 sizeof(gpt_e[i].partition_name));
756
757 for (k = 0; k < min(dosname_len, efiname_len); k++)
758 gpt_e[i].partition_name[k] =
759 (efi_char16_t)(partitions[i].name[k]);
760
761 debug("%s: name: %s offset[%d]: 0x" LBAF
762 " size[%d]: 0x" LBAF "\n",
763 __func__, partitions[i].name, i,
764 offset, i, size);
765 }
766
767 return 0;
768 }
769
partition_entries_offset(struct blk_desc * dev_desc)770 static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
771 {
772 uint32_t offset_blks = 2;
773 uint32_t __maybe_unused offset_bytes;
774 int __maybe_unused config_offset;
775
776 #if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
777 /*
778 * Some architectures require their SPL loader at a fixed
779 * address within the first 16KB of the disk. To avoid an
780 * overlap with the partition entries of the EFI partition
781 * table, the first safe offset (in bytes, from the start of
782 * the disk) for the entries can be set in
783 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
784 */
785 offset_bytes = PAD_SIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc->rawblksz);
786 offset_blks = offset_bytes / dev_desc->rawblksz;
787 #endif
788
789 #if defined(CONFIG_OF_CONTROL)
790 /*
791 * Allow the offset of the first partition entires (in bytes
792 * from the start of the device) to be specified as a property
793 * of the device tree '/config' node.
794 */
795 config_offset = fdtdec_get_config_int(gd->fdt_blob,
796 "u-boot,efi-partition-entries-offset",
797 -EINVAL);
798 if (config_offset != -EINVAL) {
799 offset_bytes = PAD_SIZE(config_offset, dev_desc->rawblksz);
800 offset_blks = offset_bytes / dev_desc->rawblksz;
801 }
802 #endif
803
804 debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
805
806 /*
807 * The earliest LBA this can be at is LBA#2 (i.e. right behind
808 * the (protective) MBR and the GPT header.
809 */
810 if (offset_blks < 2)
811 offset_blks = 2;
812
813 return offset_blks;
814 }
815
gpt_fill_header(struct blk_desc * dev_desc,gpt_header * gpt_h,char * str_guid,int parts_count)816 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
817 char *str_guid, int parts_count)
818 {
819 gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
820 gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
821 gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
822 gpt_h->my_lba = cpu_to_le64(1);
823 gpt_h->alternate_lba = cpu_to_le64(dev_desc->rawlba - 1);
824 gpt_h->partition_entry_lba =
825 cpu_to_le64(partition_entries_offset(dev_desc));
826 if (dev_desc->rawblksz == 4096) {
827 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 6);
828 gpt_h->first_usable_lba =
829 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 4);
830 } else {
831 gpt_h->last_usable_lba = cpu_to_le64(dev_desc->rawlba - 34);
832 gpt_h->first_usable_lba =
833 cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
834 }
835 gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
836 gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
837 gpt_h->header_crc32 = 0;
838 gpt_h->partition_entry_array_crc32 = 0;
839
840 if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
841 return -1;
842
843 return 0;
844 }
845
gpt_restore(struct blk_desc * dev_desc,char * str_disk_guid,disk_partition_t * partitions,int parts_count)846 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
847 disk_partition_t *partitions, int parts_count)
848 {
849 gpt_header *gpt_h;
850 gpt_entry *gpt_e;
851 int ret, size;
852
853 size = PAD_SIZE(sizeof(gpt_header), dev_desc->rawblksz);
854 gpt_h = malloc_cache_aligned(size);
855 if (gpt_h == NULL) {
856 printf("%s: calloc failed!\n", __func__);
857 return -1;
858 }
859 memset(gpt_h, 0, size);
860
861 size = PAD_SIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry), dev_desc->rawblksz);
862 gpt_e = malloc_cache_aligned(size);
863 if (gpt_e == NULL) {
864 printf("%s: calloc failed!\n", __func__);
865 free(gpt_h);
866 return -1;
867 }
868 memset(gpt_e, 0, size);
869
870 /* Generate Primary GPT header (LBA1) */
871 ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
872 if (ret)
873 goto err;
874
875 /* Generate partition entries */
876 ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
877 if (ret)
878 goto err;
879
880 /* Write GPT partition table */
881 ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
882
883 err:
884 free(gpt_e);
885 free(gpt_h);
886 return ret;
887 }
888
889 /**
890 * gpt_convert_efi_name_to_char() - convert u16 string to char string
891 *
892 * TODO: this conversion only supports ANSI characters
893 *
894 * @s: target buffer
895 * @es: u16 string to be converted
896 * @n: size of target buffer
897 */
gpt_convert_efi_name_to_char(char * s,void * es,int n)898 static void gpt_convert_efi_name_to_char(char *s, void *es, int n)
899 {
900 char *ess = es;
901 int i, j;
902
903 memset(s, '\0', n);
904
905 for (i = 0, j = 0; j < n; i += 2, j++) {
906 s[j] = ess[i];
907 if (!ess[i])
908 return;
909 }
910 }
911
gpt_verify_headers(struct blk_desc * dev_desc,gpt_header * gpt_head,gpt_entry ** gpt_pte)912 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
913 gpt_entry **gpt_pte)
914 {
915 /*
916 * This function validates AND
917 * fills in the GPT header and PTE
918 */
919 if (is_gpt_valid(dev_desc,
920 GPT_PRIMARY_PARTITION_TABLE_LBA,
921 gpt_head, gpt_pte) != 1) {
922 printf("%s: *** ERROR: Invalid GPT ***\n",
923 __func__);
924 return -1;
925 }
926 if (is_gpt_valid(dev_desc, (dev_desc->rawlba - 1),
927 gpt_head, gpt_pte) != 1) {
928 printf("%s: *** ERROR: Invalid Backup GPT ***\n",
929 __func__);
930 return -1;
931 }
932
933 return 0;
934 }
935
gpt_verify_partitions(struct blk_desc * dev_desc,disk_partition_t * partitions,int parts,gpt_header * gpt_head,gpt_entry ** gpt_pte)936 int gpt_verify_partitions(struct blk_desc *dev_desc,
937 disk_partition_t *partitions, int parts,
938 gpt_header *gpt_head, gpt_entry **gpt_pte)
939 {
940 char efi_str[PARTNAME_SZ + 1];
941 u64 gpt_part_size;
942 gpt_entry *gpt_e;
943 int ret, i;
944
945 ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
946 if (ret)
947 return ret;
948
949 gpt_e = *gpt_pte;
950
951 for (i = 0; i < parts; i++) {
952 if (i == gpt_head->num_partition_entries) {
953 pr_err("More partitions than allowed!\n");
954 return -1;
955 }
956
957 /* Check if GPT and ENV partition names match */
958 gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
959 PARTNAME_SZ + 1);
960
961 debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
962 __func__, i, efi_str, partitions[i].name);
963
964 if (strncmp(efi_str, (char *)partitions[i].name,
965 sizeof(partitions->name))) {
966 pr_err("Partition name: %s does not match %s!\n",
967 efi_str, (char *)partitions[i].name);
968 return -1;
969 }
970
971 /* Check if GPT and ENV sizes match */
972 gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
973 le64_to_cpu(gpt_e[i].starting_lba) + 1;
974 debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
975 (unsigned long long)gpt_part_size,
976 (unsigned long long)partitions[i].size);
977
978 if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
979 /* We do not check the extend partition size */
980 if ((i == parts - 1) && (partitions[i].size == 0))
981 continue;
982
983 pr_err("Partition %s size: %llu does not match %llu!\n",
984 efi_str, (unsigned long long)gpt_part_size,
985 (unsigned long long)partitions[i].size);
986 return -1;
987 }
988
989 /*
990 * Start address is optional - check only if provided
991 * in '$partition' variable
992 */
993 if (!partitions[i].start) {
994 debug("\n");
995 continue;
996 }
997
998 /* Check if GPT and ENV start LBAs match */
999 debug("start LBA - GPT: %8llu, ENV: %8llu\n",
1000 le64_to_cpu(gpt_e[i].starting_lba),
1001 (unsigned long long)partitions[i].start);
1002
1003 if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
1004 pr_err("Partition %s start: %llu does not match %llu!\n",
1005 efi_str, le64_to_cpu(gpt_e[i].starting_lba),
1006 (unsigned long long)partitions[i].start);
1007 return -1;
1008 }
1009 }
1010
1011 return 0;
1012 }
1013
is_valid_gpt_buf(struct blk_desc * dev_desc,void * buf)1014 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
1015 {
1016 gpt_header *gpt_h;
1017 gpt_entry *gpt_e;
1018
1019 /* determine start of GPT Header in the buffer */
1020 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
1021 dev_desc->rawblksz);
1022
1023 if ((le64_to_cpu(gpt_h->alternate_lba) + 1)
1024 != cpu_to_le64(dev_desc->rawlba) &&
1025 le64_to_cpu(gpt_h->last_usable_lba) != FACTORY_UNKNOWN_LBA) {
1026 printf("%s: failed checking '%s'\n", __func__,
1027 "invalid GPT Disk Size");
1028 return -1;
1029 }
1030
1031 if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
1032 dev_desc->rawlba))
1033 return -1;
1034
1035 /* determine start of GPT Entries in the buffer */
1036 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
1037 dev_desc->rawblksz);
1038 if (validate_gpt_entries(gpt_h, gpt_e))
1039 return -1;
1040
1041 return 0;
1042 }
1043
write_mbr_and_gpt_partitions(struct blk_desc * dev_desc,void * buf)1044 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
1045 {
1046 gpt_header *gpt_h;
1047 gpt_entry *gpt_e;
1048 int gpt_e_blk_cnt;
1049 lbaint_t lba;
1050 int cnt;
1051
1052 if (!dev_desc->rawblksz || !dev_desc->rawlba) {
1053 dev_desc->rawblksz = dev_desc->blksz;
1054 dev_desc->rawlba = dev_desc->lba;
1055 }
1056
1057 if (is_valid_gpt_buf(dev_desc, buf))
1058 return -1;
1059
1060 /* determine start of GPT Header in the buffer */
1061 gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
1062 dev_desc->rawblksz);
1063
1064 /* determine start of GPT Entries in the buffer */
1065 gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
1066 dev_desc->rawblksz);
1067 gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
1068 le32_to_cpu(gpt_h->sizeof_partition_entry)),
1069 dev_desc);
1070
1071 /* write MBR */
1072 lba = 0; /* MBR is always at 0 */
1073 cnt = 1; /* MBR (1 block) */
1074 if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
1075 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
1076 __func__, "MBR", cnt, lba);
1077 return 1;
1078 }
1079
1080 /* write Primary GPT */
1081 lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
1082 cnt = 1; /* GPT Header (1 block) */
1083 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
1084 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
1085 __func__, "Primary GPT Header", cnt, lba);
1086 return 1;
1087 }
1088
1089 lba = le64_to_cpu(gpt_h->partition_entry_lba);
1090 cnt = gpt_e_blk_cnt;
1091 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
1092 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
1093 __func__, "Primary GPT Entries", cnt, lba);
1094 return 1;
1095 }
1096
1097 prepare_backup_gpt_header(gpt_h);
1098
1099 /* write Backup GPT */
1100 lba = le64_to_cpu(gpt_h->partition_entry_lba);
1101 cnt = gpt_e_blk_cnt;
1102 if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
1103 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
1104 __func__, "Backup GPT Entries", cnt, lba);
1105 return 1;
1106 }
1107
1108 lba = le64_to_cpu(gpt_h->my_lba);
1109 cnt = 1; /* GPT Header (1 block) */
1110 if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
1111 printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
1112 __func__, "Backup GPT Header", cnt, lba);
1113 return 1;
1114 }
1115
1116 return 0;
1117 }
1118 #endif
1119
1120 /*
1121 * Private functions
1122 */
1123 /*
1124 * pmbr_part_valid(): Check for EFI partition signature
1125 *
1126 * Returns: 1 if EFI GPT partition type is found.
1127 */
pmbr_part_valid(struct partition * part)1128 static int pmbr_part_valid(struct partition *part)
1129 {
1130 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
1131 get_unaligned_le32(&part->start_sect) == 1UL) {
1132 return 1;
1133 }
1134
1135 return 0;
1136 }
1137
1138 /*
1139 * is_pmbr_valid(): test Protective MBR for validity
1140 *
1141 * Returns: 1 if PMBR is valid, 0 otherwise.
1142 * Validity depends on two things:
1143 * 1) MSDOS signature is in the last two bytes of the MBR
1144 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
1145 */
is_pmbr_valid(legacy_mbr * mbr)1146 static int is_pmbr_valid(legacy_mbr * mbr)
1147 {
1148 int i = 0;
1149
1150 #ifdef CONFIG_ARCH_ROCKCHIP
1151 /*
1152 * In sd-update card, we use RKPARM partition in bootloader to load
1153 * firmware, and use MS-DOS partition in recovery to update system.
1154 * Now, we want to use gpt in bootloader and abandon the RKPARM
1155 * partition. So in new sd-update card, we write the MS-DOS partition
1156 * table and gpt to sd card. Then we must return 1 directly when test
1157 * the mbr sector otherwise the gpt is unavailable.
1158 */
1159 return 1;
1160 #endif
1161
1162 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
1163 return 0;
1164
1165 for (i = 0; i < 4; i++) {
1166 if (pmbr_part_valid(&mbr->partition_record[i])) {
1167 return 1;
1168 }
1169 }
1170 return 0;
1171 }
1172
1173 /**
1174 * is_gpt_valid() - tests one GPT header and PTEs for validity
1175 *
1176 * lba is the logical block address of the GPT header to test
1177 * gpt is a GPT header ptr, filled on return.
1178 * ptes is a PTEs ptr, filled on return.
1179 *
1180 * Description: returns 1 if valid, 0 on error.
1181 * If valid, returns pointers to PTEs.
1182 */
is_gpt_valid(struct blk_desc * dev_desc,u64 lba,gpt_header * pgpt_head,gpt_entry ** pgpt_pte)1183 static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
1184 gpt_header *pgpt_head, gpt_entry **pgpt_pte)
1185 {
1186 int sector;
1187 /* Confirm valid arguments prior to allocation. */
1188 if (!dev_desc || !pgpt_head) {
1189 printf("%s: Invalid Argument(s)\n", __func__);
1190 return 0;
1191 }
1192
1193 /* Re-use pte if it's not NULL */
1194 if (*pgpt_pte)
1195 return 1;
1196
1197 ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->rawblksz);
1198
1199 sector = dev_desc->rawblksz / dev_desc->blksz;
1200 /* Read MBR Header from device */
1201 if (blk_dread(dev_desc, 0, sector, (ulong *)mbr) != sector) {
1202 printf("*** ERROR: Can't read MBR header ***\n");
1203 return 0;
1204 }
1205
1206 /* Read GPT Header from device */
1207 if (blk_dread(dev_desc, (lbaint_t)lba * sector, sector, pgpt_head) != sector) {
1208 printf("*** ERROR: Can't read GPT header ***\n");
1209 return 0;
1210 }
1211
1212 if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->rawlba))
1213 return 0;
1214
1215 if (dev_desc->sig_type == SIG_TYPE_NONE) {
1216 efi_guid_t empty = {};
1217 if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
1218 dev_desc->sig_type = SIG_TYPE_GUID;
1219 memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
1220 sizeof(empty));
1221 } else if (mbr->unique_mbr_signature != 0) {
1222 dev_desc->sig_type = SIG_TYPE_MBR;
1223 dev_desc->mbr_sig = mbr->unique_mbr_signature;
1224 }
1225 }
1226
1227 /* Read and allocate Partition Table Entries */
1228 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
1229 if (*pgpt_pte == NULL) {
1230 printf("GPT: Failed to allocate memory for PTE\n");
1231 return 0;
1232 }
1233
1234 if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
1235 free(*pgpt_pte);
1236 *pgpt_pte = NULL;
1237 return 0;
1238 }
1239
1240 /* We're done, all's well */
1241 return 1;
1242 }
1243
1244 /**
1245 * alloc_read_gpt_entries(): reads partition entries from disk
1246 * @dev_desc
1247 * @gpt - GPT header
1248 *
1249 * Description: Returns ptes on success, NULL on error.
1250 * Allocates space for PTEs based on information found in @gpt.
1251 * Notes: remember to free pte when you're done!
1252 */
alloc_read_gpt_entries(struct blk_desc * dev_desc,gpt_header * pgpt_head)1253 static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
1254 gpt_header *pgpt_head)
1255 {
1256 size_t count = 0, blk_cnt;
1257 lbaint_t blk;
1258 gpt_entry *pte = NULL;
1259
1260 if (!dev_desc || !pgpt_head) {
1261 printf("%s: Invalid Argument(s)\n", __func__);
1262 return NULL;
1263 }
1264
1265 count = le32_to_cpu(pgpt_head->num_partition_entries) *
1266 le32_to_cpu(pgpt_head->sizeof_partition_entry);
1267
1268 debug("%s: count = %u * %u = %lu\n", __func__,
1269 (u32) le32_to_cpu(pgpt_head->num_partition_entries),
1270 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
1271 (ulong)count);
1272
1273 /* Allocate memory for PTE, remember to FREE */
1274 if (count != 0) {
1275 pte = memalign(ARCH_DMA_MINALIGN,
1276 PAD_SIZE(count, dev_desc->rawblksz));
1277 }
1278
1279 if (count == 0 || pte == NULL) {
1280 printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
1281 __func__, (ulong)count);
1282 return NULL;
1283 }
1284
1285 /* Read GPT Entries from device */
1286 blk = le64_to_cpu(pgpt_head->partition_entry_lba);
1287 blk_cnt = BLOCK_CNT(count, dev_desc);
1288 if (blk_dread(dev_desc, blk * dev_desc->rawblksz / dev_desc->blksz, (lbaint_t)blk_cnt, pte) != blk_cnt) {
1289 printf("*** ERROR: Can't read GPT Entries ***\n");
1290 free(pte);
1291 return NULL;
1292 }
1293 return pte;
1294 }
1295
1296 /**
1297 * is_pte_valid(): validates a single Partition Table Entry
1298 * @gpt_entry - Pointer to a single Partition Table Entry
1299 *
1300 * Description: returns 1 if valid, 0 on error.
1301 */
is_pte_valid(gpt_entry * pte)1302 static int is_pte_valid(gpt_entry * pte)
1303 {
1304 efi_guid_t unused_guid;
1305
1306 if (!pte) {
1307 printf("%s: Invalid Argument(s)\n", __func__);
1308 return 0;
1309 }
1310
1311 /* Only one validation for now:
1312 * The GUID Partition Type != Unused Entry (ALL-ZERO)
1313 */
1314 memset(unused_guid.b, 0, sizeof(unused_guid.b));
1315
1316 if (memcmp(pte->partition_type_guid.b, unused_guid.b,
1317 sizeof(unused_guid.b)) == 0) {
1318
1319 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
1320 (unsigned int)(uintptr_t)pte);
1321
1322 return 0;
1323 } else {
1324 return 1;
1325 }
1326 }
1327
1328 /*
1329 * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
1330 * check EFI first, since a DOS partition is often used as a 'protective MBR'
1331 * with EFI.
1332 */
1333 U_BOOT_PART_TYPE(a_efi) = {
1334 .name = "EFI",
1335 .part_type = PART_TYPE_EFI,
1336 .max_entries = GPT_ENTRY_NUMBERS,
1337 .get_info = part_get_info_ptr(part_get_info_efi),
1338 .print = part_print_ptr(part_print_efi),
1339 .test = part_test_efi,
1340 };
1341 #endif
1342