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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 | * Problems with CONFIG_SYS_64BIT_LBA: | |
10 | * | |
11 | * struct disk_partition.start in include/part.h is sized as ulong. | |
12 | * When CONFIG_SYS_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t. | |
13 | * For now, it is cast back to ulong at assignment. | |
14 | * | |
15 | * This limits the maximum size of addressable storage to < 2 Terra Bytes | |
16 | */ | |
17 | #include <asm/unaligned.h> | |
18 | #include <common.h> | |
19 | #include <command.h> | |
20 | #include <ide.h> | |
21 | #include <malloc.h> | |
22 | #include <part_efi.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 | */ | |
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(block_dev_desc_t * dev_desc, unsigned long long lba, | |
47 | gpt_header * pgpt_head, gpt_entry ** pgpt_pte); | |
48 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, | |
49 | gpt_header * pgpt_head); | |
50 | static int is_pte_valid(gpt_entry * pte); | |
51 | ||
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 | ||
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 | #ifdef CONFIG_EFI_PARTITION | |
76 | /* | |
77 | * Public Functions (include/part.h) | |
78 | */ | |
79 | ||
80 | void print_part_efi(block_dev_desc_t * dev_desc) | |
81 | { | |
82 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); | |
83 | gpt_entry *gpt_pte = NULL; | |
84 | int i = 0; | |
85 | char uuid[37]; | |
86 | unsigned char *uuid_bin; | |
87 | ||
88 | if (!dev_desc) { | |
89 | printf("%s: Invalid Argument(s)\n", __func__); | |
90 | return; | |
91 | } | |
92 | /* This function validates AND fills in the GPT header and PTE */ | |
93 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
94 | gpt_head, &gpt_pte) != 1) { | |
95 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); | |
96 | if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), | |
97 | gpt_head, &gpt_pte) != 1) { | |
98 | printf("%s: *** ERROR: Invalid Backup GPT ***\n", | |
99 | __func__); | |
100 | return; | |
101 | } else { | |
102 | printf("%s: *** Using Backup GPT ***\n", | |
103 | __func__); | |
104 | } | |
105 | } | |
106 | ||
107 | debug("%s: gpt-entry at %p\n", __func__, gpt_pte); | |
108 | ||
109 | printf("Part\tStart LBA\tEnd LBA\t\tName\n"); | |
110 | printf("\tAttributes\n"); | |
111 | printf("\tType GUID\n"); | |
112 | printf("\tPartition GUID\n"); | |
113 | ||
114 | for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { | |
115 | /* Stop at the first non valid PTE */ | |
116 | if (!is_pte_valid(&gpt_pte[i])) | |
117 | break; | |
118 | ||
119 | printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), | |
120 | le64_to_cpu(gpt_pte[i].starting_lba), | |
121 | le64_to_cpu(gpt_pte[i].ending_lba), | |
122 | print_efiname(&gpt_pte[i])); | |
123 | printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); | |
124 | uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; | |
125 | uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); | |
126 | printf("\ttype:\t%s\n", uuid); | |
127 | uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; | |
128 | uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); | |
129 | printf("\tguid:\t%s\n", uuid); | |
130 | } | |
131 | ||
132 | /* Remember to free pte */ | |
133 | free(gpt_pte); | |
134 | return; | |
135 | } | |
136 | ||
137 | int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, | |
138 | disk_partition_t * info) | |
139 | { | |
140 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); | |
141 | gpt_entry *gpt_pte = NULL; | |
142 | ||
143 | /* "part" argument must be at least 1 */ | |
144 | if (!dev_desc || !info || part < 1) { | |
145 | printf("%s: Invalid Argument(s)\n", __func__); | |
146 | return -1; | |
147 | } | |
148 | ||
149 | /* This function validates AND fills in the GPT header and PTE */ | |
150 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
151 | gpt_head, &gpt_pte) != 1) { | |
152 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); | |
153 | if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), | |
154 | gpt_head, &gpt_pte) != 1) { | |
155 | printf("%s: *** ERROR: Invalid Backup GPT ***\n", | |
156 | __func__); | |
157 | return -1; | |
158 | } else { | |
159 | printf("%s: *** Using Backup GPT ***\n", | |
160 | __func__); | |
161 | } | |
162 | } | |
163 | ||
164 | if (part > le32_to_cpu(gpt_head->num_partition_entries) || | |
165 | !is_pte_valid(&gpt_pte[part - 1])) { | |
166 | debug("%s: *** ERROR: Invalid partition number %d ***\n", | |
167 | __func__, part); | |
168 | free(gpt_pte); | |
169 | return -1; | |
170 | } | |
171 | ||
172 | /* The ulong casting limits the maximum disk size to 2 TB */ | |
173 | info->start = (u64)le64_to_cpu(gpt_pte[part - 1].starting_lba); | |
174 | /* The ending LBA is inclusive, to calculate size, add 1 to it */ | |
175 | info->size = ((u64)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1) | |
176 | - info->start; | |
177 | info->blksz = dev_desc->blksz; | |
178 | ||
179 | sprintf((char *)info->name, "%s", | |
180 | print_efiname(&gpt_pte[part - 1])); | |
181 | sprintf((char *)info->type, "U-Boot"); | |
182 | info->bootable = is_bootable(&gpt_pte[part - 1]); | |
183 | #ifdef CONFIG_PARTITION_UUIDS | |
184 | uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, | |
185 | UUID_STR_FORMAT_GUID); | |
186 | #endif | |
187 | ||
188 | debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s", __func__, | |
189 | info->start, info->size, info->name); | |
190 | ||
191 | /* Remember to free pte */ | |
192 | free(gpt_pte); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | int test_part_efi(block_dev_desc_t * dev_desc) | |
197 | { | |
198 | ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); | |
199 | ||
200 | /* Read legacy MBR from block 0 and validate it */ | |
201 | if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) | |
202 | || (is_pmbr_valid(legacymbr) != 1)) { | |
203 | return -1; | |
204 | } | |
205 | return 0; | |
206 | } | |
207 | ||
208 | /** | |
209 | * set_protective_mbr(): Set the EFI protective MBR | |
210 | * @param dev_desc - block device descriptor | |
211 | * | |
212 | * @return - zero on success, otherwise error | |
213 | */ | |
214 | static int set_protective_mbr(block_dev_desc_t *dev_desc) | |
215 | { | |
216 | /* Setup the Protective MBR */ | |
217 | ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1); | |
218 | memset(p_mbr, 0, sizeof(*p_mbr)); | |
219 | ||
220 | if (p_mbr == NULL) { | |
221 | printf("%s: calloc failed!\n", __func__); | |
222 | return -1; | |
223 | } | |
224 | /* Append signature */ | |
225 | p_mbr->signature = MSDOS_MBR_SIGNATURE; | |
226 | p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; | |
227 | p_mbr->partition_record[0].start_sect = 1; | |
228 | p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba; | |
229 | ||
230 | /* Write MBR sector to the MMC device */ | |
231 | if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) { | |
232 | printf("** Can't write to device %d **\n", | |
233 | dev_desc->dev); | |
234 | return -1; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | int write_gpt_table(block_dev_desc_t *dev_desc, | |
241 | gpt_header *gpt_h, gpt_entry *gpt_e) | |
242 | { | |
243 | const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries | |
244 | * sizeof(gpt_entry)), dev_desc); | |
245 | u32 calc_crc32; | |
246 | u64 val; | |
247 | ||
248 | debug("max lba: %x\n", (u32) dev_desc->lba); | |
249 | /* Setup the Protective MBR */ | |
250 | if (set_protective_mbr(dev_desc) < 0) | |
251 | goto err; | |
252 | ||
253 | /* Generate CRC for the Primary GPT Header */ | |
254 | calc_crc32 = efi_crc32((const unsigned char *)gpt_e, | |
255 | le32_to_cpu(gpt_h->num_partition_entries) * | |
256 | le32_to_cpu(gpt_h->sizeof_partition_entry)); | |
257 | gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); | |
258 | ||
259 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
260 | le32_to_cpu(gpt_h->header_size)); | |
261 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
262 | ||
263 | /* Write the First GPT to the block right after the Legacy MBR */ | |
264 | if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1) | |
265 | goto err; | |
266 | ||
267 | if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e) | |
268 | != pte_blk_cnt) | |
269 | goto err; | |
270 | ||
271 | /* recalculate the values for the Backup GPT Header */ | |
272 | val = le64_to_cpu(gpt_h->my_lba); | |
273 | gpt_h->my_lba = gpt_h->alternate_lba; | |
274 | gpt_h->alternate_lba = cpu_to_le64(val); | |
275 | gpt_h->header_crc32 = 0; | |
276 | ||
277 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
278 | le32_to_cpu(gpt_h->header_size)); | |
279 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
280 | ||
281 | if (dev_desc->block_write(dev_desc->dev, | |
282 | le32_to_cpu(gpt_h->last_usable_lba + 1), | |
283 | pte_blk_cnt, gpt_e) != pte_blk_cnt) | |
284 | goto err; | |
285 | ||
286 | if (dev_desc->block_write(dev_desc->dev, | |
287 | le32_to_cpu(gpt_h->my_lba), 1, gpt_h) != 1) | |
288 | goto err; | |
289 | ||
290 | debug("GPT successfully written to block device!\n"); | |
291 | return 0; | |
292 | ||
293 | err: | |
294 | printf("** Can't write to device %d **\n", dev_desc->dev); | |
295 | return -1; | |
296 | } | |
297 | ||
298 | int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, | |
299 | disk_partition_t *partitions, int parts) | |
300 | { | |
301 | u32 offset = (u32)le32_to_cpu(gpt_h->first_usable_lba); | |
302 | ulong start; | |
303 | int i, k; | |
304 | size_t efiname_len, dosname_len; | |
305 | #ifdef CONFIG_PARTITION_UUIDS | |
306 | char *str_uuid; | |
307 | unsigned char *bin_uuid; | |
308 | #endif | |
309 | ||
310 | for (i = 0; i < parts; i++) { | |
311 | /* partition starting lba */ | |
312 | start = partitions[i].start; | |
313 | if (start && (start < offset)) { | |
314 | printf("Partition overlap\n"); | |
315 | return -1; | |
316 | } | |
317 | if (start) { | |
318 | gpt_e[i].starting_lba = cpu_to_le64(start); | |
319 | offset = start + partitions[i].size; | |
320 | } else { | |
321 | gpt_e[i].starting_lba = cpu_to_le64(offset); | |
322 | offset += partitions[i].size; | |
323 | } | |
324 | if (offset >= gpt_h->last_usable_lba) { | |
325 | printf("Partitions layout exceds disk size\n"); | |
326 | return -1; | |
327 | } | |
328 | /* partition ending lba */ | |
329 | if ((i == parts - 1) && (partitions[i].size == 0)) | |
330 | /* extend the last partition to maximuim */ | |
331 | gpt_e[i].ending_lba = gpt_h->last_usable_lba; | |
332 | else | |
333 | gpt_e[i].ending_lba = cpu_to_le64(offset - 1); | |
334 | ||
335 | /* partition type GUID */ | |
336 | memcpy(gpt_e[i].partition_type_guid.b, | |
337 | &PARTITION_BASIC_DATA_GUID, 16); | |
338 | ||
339 | #ifdef CONFIG_PARTITION_UUIDS | |
340 | str_uuid = partitions[i].uuid; | |
341 | bin_uuid = gpt_e[i].unique_partition_guid.b; | |
342 | ||
343 | if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) { | |
344 | printf("Partition no. %d: invalid guid: %s\n", | |
345 | i, str_uuid); | |
346 | return -1; | |
347 | } | |
348 | #endif | |
349 | ||
350 | /* partition attributes */ | |
351 | memset(&gpt_e[i].attributes, 0, | |
352 | sizeof(gpt_entry_attributes)); | |
353 | ||
354 | /* partition name */ | |
355 | efiname_len = sizeof(gpt_e[i].partition_name) | |
356 | / sizeof(efi_char16_t); | |
357 | dosname_len = sizeof(partitions[i].name); | |
358 | ||
359 | memset(gpt_e[i].partition_name, 0, | |
360 | sizeof(gpt_e[i].partition_name)); | |
361 | ||
362 | for (k = 0; k < min(dosname_len, efiname_len); k++) | |
363 | gpt_e[i].partition_name[k] = | |
364 | (efi_char16_t)(partitions[i].name[k]); | |
365 | ||
366 | debug("%s: name: %s offset[%d]: 0x%x size[%d]: 0x" LBAF "\n", | |
367 | __func__, partitions[i].name, i, | |
368 | offset, i, partitions[i].size); | |
369 | } | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h, | |
375 | char *str_guid, int parts_count) | |
376 | { | |
377 | gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); | |
378 | gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); | |
379 | gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); | |
380 | gpt_h->my_lba = cpu_to_le64(1); | |
381 | gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); | |
382 | gpt_h->first_usable_lba = cpu_to_le64(34); | |
383 | gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); | |
384 | gpt_h->partition_entry_lba = cpu_to_le64(2); | |
385 | gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); | |
386 | gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); | |
387 | gpt_h->header_crc32 = 0; | |
388 | gpt_h->partition_entry_array_crc32 = 0; | |
389 | ||
390 | if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) | |
391 | return -1; | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid, | |
397 | disk_partition_t *partitions, int parts_count) | |
398 | { | |
399 | int ret; | |
400 | ||
401 | gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header), | |
402 | dev_desc)); | |
403 | gpt_entry *gpt_e; | |
404 | ||
405 | if (gpt_h == NULL) { | |
406 | printf("%s: calloc failed!\n", __func__); | |
407 | return -1; | |
408 | } | |
409 | ||
410 | gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS | |
411 | * sizeof(gpt_entry), | |
412 | dev_desc)); | |
413 | if (gpt_e == NULL) { | |
414 | printf("%s: calloc failed!\n", __func__); | |
415 | free(gpt_h); | |
416 | return -1; | |
417 | } | |
418 | ||
419 | /* Generate Primary GPT header (LBA1) */ | |
420 | ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); | |
421 | if (ret) | |
422 | goto err; | |
423 | ||
424 | /* Generate partition entries */ | |
425 | ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count); | |
426 | if (ret) | |
427 | goto err; | |
428 | ||
429 | /* Write GPT partition table */ | |
430 | ret = write_gpt_table(dev_desc, gpt_h, gpt_e); | |
431 | ||
432 | err: | |
433 | free(gpt_e); | |
434 | free(gpt_h); | |
435 | return ret; | |
436 | } | |
437 | #endif | |
438 | ||
439 | /* | |
440 | * Private functions | |
441 | */ | |
442 | /* | |
443 | * pmbr_part_valid(): Check for EFI partition signature | |
444 | * | |
445 | * Returns: 1 if EFI GPT partition type is found. | |
446 | */ | |
447 | static int pmbr_part_valid(struct partition *part) | |
448 | { | |
449 | if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && | |
450 | get_unaligned_le32(&part->start_sect) == 1UL) { | |
451 | return 1; | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | /* | |
458 | * is_pmbr_valid(): test Protective MBR for validity | |
459 | * | |
460 | * Returns: 1 if PMBR is valid, 0 otherwise. | |
461 | * Validity depends on two things: | |
462 | * 1) MSDOS signature is in the last two bytes of the MBR | |
463 | * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() | |
464 | */ | |
465 | static int is_pmbr_valid(legacy_mbr * mbr) | |
466 | { | |
467 | int i = 0; | |
468 | ||
469 | if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) | |
470 | return 0; | |
471 | ||
472 | for (i = 0; i < 4; i++) { | |
473 | if (pmbr_part_valid(&mbr->partition_record[i])) { | |
474 | return 1; | |
475 | } | |
476 | } | |
477 | return 0; | |
478 | } | |
479 | ||
480 | /** | |
481 | * is_gpt_valid() - tests one GPT header and PTEs for validity | |
482 | * | |
483 | * lba is the logical block address of the GPT header to test | |
484 | * gpt is a GPT header ptr, filled on return. | |
485 | * ptes is a PTEs ptr, filled on return. | |
486 | * | |
487 | * Description: returns 1 if valid, 0 on error. | |
488 | * If valid, returns pointers to PTEs. | |
489 | */ | |
490 | static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, | |
491 | gpt_header * pgpt_head, gpt_entry ** pgpt_pte) | |
492 | { | |
493 | u32 crc32_backup = 0; | |
494 | u32 calc_crc32; | |
495 | unsigned long long lastlba; | |
496 | ||
497 | if (!dev_desc || !pgpt_head) { | |
498 | printf("%s: Invalid Argument(s)\n", __func__); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | /* Read GPT Header from device */ | |
503 | if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) { | |
504 | printf("*** ERROR: Can't read GPT header ***\n"); | |
505 | return 0; | |
506 | } | |
507 | ||
508 | /* Check the GPT header signature */ | |
509 | if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { | |
510 | printf("GUID Partition Table Header signature is wrong:" | |
511 | "0x%llX != 0x%llX\n", | |
512 | le64_to_cpu(pgpt_head->signature), | |
513 | GPT_HEADER_SIGNATURE); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* Check the GUID Partition Table CRC */ | |
518 | memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup)); | |
519 | memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); | |
520 | ||
521 | calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, | |
522 | le32_to_cpu(pgpt_head->header_size)); | |
523 | ||
524 | memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup)); | |
525 | ||
526 | if (calc_crc32 != le32_to_cpu(crc32_backup)) { | |
527 | printf("GUID Partition Table Header CRC is wrong:" | |
528 | "0x%x != 0x%x\n", | |
529 | le32_to_cpu(crc32_backup), calc_crc32); | |
530 | return 0; | |
531 | } | |
532 | ||
533 | /* Check that the my_lba entry points to the LBA that contains the GPT */ | |
534 | if (le64_to_cpu(pgpt_head->my_lba) != lba) { | |
535 | printf("GPT: my_lba incorrect: %llX != %llX\n", | |
536 | le64_to_cpu(pgpt_head->my_lba), | |
537 | lba); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | /* Check the first_usable_lba and last_usable_lba are within the disk. */ | |
542 | lastlba = (unsigned long long)dev_desc->lba; | |
543 | if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) { | |
544 | printf("GPT: first_usable_lba incorrect: %llX > %llX\n", | |
545 | le64_to_cpu(pgpt_head->first_usable_lba), lastlba); | |
546 | return 0; | |
547 | } | |
548 | if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) { | |
549 | printf("GPT: last_usable_lba incorrect: %llX > %llX\n", | |
550 | (u64) le64_to_cpu(pgpt_head->last_usable_lba), lastlba); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", | |
555 | le64_to_cpu(pgpt_head->first_usable_lba), | |
556 | le64_to_cpu(pgpt_head->last_usable_lba), lastlba); | |
557 | ||
558 | /* Read and allocate Partition Table Entries */ | |
559 | *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); | |
560 | if (*pgpt_pte == NULL) { | |
561 | printf("GPT: Failed to allocate memory for PTE\n"); | |
562 | return 0; | |
563 | } | |
564 | ||
565 | /* Check the GUID Partition Table Entry Array CRC */ | |
566 | calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, | |
567 | le32_to_cpu(pgpt_head->num_partition_entries) * | |
568 | le32_to_cpu(pgpt_head->sizeof_partition_entry)); | |
569 | ||
570 | if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) { | |
571 | printf("GUID Partition Table Entry Array CRC is wrong:" | |
572 | "0x%x != 0x%x\n", | |
573 | le32_to_cpu(pgpt_head->partition_entry_array_crc32), | |
574 | calc_crc32); | |
575 | ||
576 | free(*pgpt_pte); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | /* We're done, all's well */ | |
581 | return 1; | |
582 | } | |
583 | ||
584 | /** | |
585 | * alloc_read_gpt_entries(): reads partition entries from disk | |
586 | * @dev_desc | |
587 | * @gpt - GPT header | |
588 | * | |
589 | * Description: Returns ptes on success, NULL on error. | |
590 | * Allocates space for PTEs based on information found in @gpt. | |
591 | * Notes: remember to free pte when you're done! | |
592 | */ | |
593 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, | |
594 | gpt_header * pgpt_head) | |
595 | { | |
596 | size_t count = 0, blk_cnt; | |
597 | gpt_entry *pte = NULL; | |
598 | ||
599 | if (!dev_desc || !pgpt_head) { | |
600 | printf("%s: Invalid Argument(s)\n", __func__); | |
601 | return NULL; | |
602 | } | |
603 | ||
604 | count = le32_to_cpu(pgpt_head->num_partition_entries) * | |
605 | le32_to_cpu(pgpt_head->sizeof_partition_entry); | |
606 | ||
607 | debug("%s: count = %u * %u = %zu\n", __func__, | |
608 | (u32) le32_to_cpu(pgpt_head->num_partition_entries), | |
609 | (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); | |
610 | ||
611 | /* Allocate memory for PTE, remember to FREE */ | |
612 | if (count != 0) { | |
613 | pte = memalign(ARCH_DMA_MINALIGN, | |
614 | PAD_TO_BLOCKSIZE(count, dev_desc)); | |
615 | } | |
616 | ||
617 | if (count == 0 || pte == NULL) { | |
618 | printf("%s: ERROR: Can't allocate 0x%zX " | |
619 | "bytes for GPT Entries\n", | |
620 | __func__, count); | |
621 | return NULL; | |
622 | } | |
623 | ||
624 | /* Read GPT Entries from device */ | |
625 | blk_cnt = BLOCK_CNT(count, dev_desc); | |
626 | if (dev_desc->block_read (dev_desc->dev, | |
627 | le64_to_cpu(pgpt_head->partition_entry_lba), | |
628 | (lbaint_t) (blk_cnt), pte) | |
629 | != blk_cnt) { | |
630 | ||
631 | printf("*** ERROR: Can't read GPT Entries ***\n"); | |
632 | free(pte); | |
633 | return NULL; | |
634 | } | |
635 | return pte; | |
636 | } | |
637 | ||
638 | /** | |
639 | * is_pte_valid(): validates a single Partition Table Entry | |
640 | * @gpt_entry - Pointer to a single Partition Table Entry | |
641 | * | |
642 | * Description: returns 1 if valid, 0 on error. | |
643 | */ | |
644 | static int is_pte_valid(gpt_entry * pte) | |
645 | { | |
646 | efi_guid_t unused_guid; | |
647 | ||
648 | if (!pte) { | |
649 | printf("%s: Invalid Argument(s)\n", __func__); | |
650 | return 0; | |
651 | } | |
652 | ||
653 | /* Only one validation for now: | |
654 | * The GUID Partition Type != Unused Entry (ALL-ZERO) | |
655 | */ | |
656 | memset(unused_guid.b, 0, sizeof(unused_guid.b)); | |
657 | ||
658 | if (memcmp(pte->partition_type_guid.b, unused_guid.b, | |
659 | sizeof(unused_guid.b)) == 0) { | |
660 | ||
661 | debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, | |
662 | (unsigned int)(uintptr_t)pte); | |
663 | ||
664 | return 0; | |
665 | } else { | |
666 | return 1; | |
667 | } | |
668 | } | |
669 | #endif |