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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 | * 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 <ide.h> | |
17 | #include <malloc.h> | |
18 | #include <part_efi.h> | |
19 | #include <linux/ctype.h> | |
20 | ||
21 | DECLARE_GLOBAL_DATA_PTR; | |
22 | ||
23 | #ifdef HAVE_BLOCK_DEVICE | |
24 | /** | |
25 | * efi_crc32() - EFI version of crc32 function | |
26 | * @buf: buffer to calculate crc32 of | |
27 | * @len - length of buf | |
28 | * | |
29 | * Description: Returns EFI-style CRC32 value for @buf | |
30 | */ | |
31 | static inline u32 efi_crc32(const void *buf, u32 len) | |
32 | { | |
33 | return crc32(0, buf, len); | |
34 | } | |
35 | ||
36 | /* | |
37 | * Private function prototypes | |
38 | */ | |
39 | ||
40 | static int pmbr_part_valid(struct partition *part); | |
41 | static int is_pmbr_valid(legacy_mbr * mbr); | |
42 | static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba, | |
43 | gpt_header *pgpt_head, gpt_entry **pgpt_pte); | |
44 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, | |
45 | gpt_header * pgpt_head); | |
46 | static int is_pte_valid(gpt_entry * pte); | |
47 | ||
48 | static char *print_efiname(gpt_entry *pte) | |
49 | { | |
50 | static char name[PARTNAME_SZ + 1]; | |
51 | int i; | |
52 | for (i = 0; i < PARTNAME_SZ; i++) { | |
53 | u8 c; | |
54 | c = pte->partition_name[i] & 0xff; | |
55 | c = (c && !isprint(c)) ? '.' : c; | |
56 | name[i] = c; | |
57 | } | |
58 | name[PARTNAME_SZ] = 0; | |
59 | return name; | |
60 | } | |
61 | ||
62 | static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; | |
63 | ||
64 | static inline int is_bootable(gpt_entry *p) | |
65 | { | |
66 | return p->attributes.fields.legacy_bios_bootable || | |
67 | !memcmp(&(p->partition_type_guid), &system_guid, | |
68 | sizeof(efi_guid_t)); | |
69 | } | |
70 | ||
71 | #ifdef CONFIG_EFI_PARTITION | |
72 | /* | |
73 | * Public Functions (include/part.h) | |
74 | */ | |
75 | ||
76 | void print_part_efi(block_dev_desc_t * dev_desc) | |
77 | { | |
78 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); | |
79 | gpt_entry *gpt_pte = NULL; | |
80 | int i = 0; | |
81 | char uuid[37]; | |
82 | unsigned char *uuid_bin; | |
83 | ||
84 | if (!dev_desc) { | |
85 | printf("%s: Invalid Argument(s)\n", __func__); | |
86 | return; | |
87 | } | |
88 | /* This function validates AND fills in the GPT header and PTE */ | |
89 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
90 | gpt_head, &gpt_pte) != 1) { | |
91 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); | |
92 | if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), | |
93 | gpt_head, &gpt_pte) != 1) { | |
94 | printf("%s: *** ERROR: Invalid Backup GPT ***\n", | |
95 | __func__); | |
96 | return; | |
97 | } else { | |
98 | printf("%s: *** Using Backup GPT ***\n", | |
99 | __func__); | |
100 | } | |
101 | } | |
102 | ||
103 | debug("%s: gpt-entry at %p\n", __func__, gpt_pte); | |
104 | ||
105 | printf("Part\tStart LBA\tEnd LBA\t\tName\n"); | |
106 | printf("\tAttributes\n"); | |
107 | printf("\tType GUID\n"); | |
108 | printf("\tPartition GUID\n"); | |
109 | ||
110 | for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { | |
111 | /* Stop at the first non valid PTE */ | |
112 | if (!is_pte_valid(&gpt_pte[i])) | |
113 | break; | |
114 | ||
115 | printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), | |
116 | le64_to_cpu(gpt_pte[i].starting_lba), | |
117 | le64_to_cpu(gpt_pte[i].ending_lba), | |
118 | print_efiname(&gpt_pte[i])); | |
119 | printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); | |
120 | uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b; | |
121 | uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); | |
122 | printf("\ttype:\t%s\n", uuid); | |
123 | uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b; | |
124 | uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID); | |
125 | printf("\tguid:\t%s\n", uuid); | |
126 | } | |
127 | ||
128 | /* Remember to free pte */ | |
129 | free(gpt_pte); | |
130 | return; | |
131 | } | |
132 | ||
133 | int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, | |
134 | disk_partition_t * info) | |
135 | { | |
136 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); | |
137 | gpt_entry *gpt_pte = NULL; | |
138 | ||
139 | /* "part" argument must be at least 1 */ | |
140 | if (!dev_desc || !info || part < 1) { | |
141 | printf("%s: Invalid Argument(s)\n", __func__); | |
142 | return -1; | |
143 | } | |
144 | ||
145 | /* This function validates AND fills in the GPT header and PTE */ | |
146 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
147 | gpt_head, &gpt_pte) != 1) { | |
148 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); | |
149 | if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), | |
150 | gpt_head, &gpt_pte) != 1) { | |
151 | printf("%s: *** ERROR: Invalid Backup GPT ***\n", | |
152 | __func__); | |
153 | return -1; | |
154 | } else { | |
155 | printf("%s: *** Using Backup GPT ***\n", | |
156 | __func__); | |
157 | } | |
158 | } | |
159 | ||
160 | if (part > le32_to_cpu(gpt_head->num_partition_entries) || | |
161 | !is_pte_valid(&gpt_pte[part - 1])) { | |
162 | debug("%s: *** ERROR: Invalid partition number %d ***\n", | |
163 | __func__, part); | |
164 | free(gpt_pte); | |
165 | return -1; | |
166 | } | |
167 | ||
168 | /* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */ | |
169 | info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba); | |
170 | /* The ending LBA is inclusive, to calculate size, add 1 to it */ | |
171 | info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1 | |
172 | - info->start; | |
173 | info->blksz = dev_desc->blksz; | |
174 | ||
175 | sprintf((char *)info->name, "%s", | |
176 | print_efiname(&gpt_pte[part - 1])); | |
177 | sprintf((char *)info->type, "U-Boot"); | |
178 | info->bootable = is_bootable(&gpt_pte[part - 1]); | |
179 | #ifdef CONFIG_PARTITION_UUIDS | |
180 | uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid, | |
181 | UUID_STR_FORMAT_GUID); | |
182 | #endif | |
183 | ||
184 | debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__, | |
185 | info->start, info->size, info->name); | |
186 | ||
187 | /* Remember to free pte */ | |
188 | free(gpt_pte); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | int get_partition_info_efi_by_name(block_dev_desc_t *dev_desc, | |
193 | const char *name, disk_partition_t *info) | |
194 | { | |
195 | int ret; | |
196 | int i; | |
197 | for (i = 1; i < GPT_ENTRY_NUMBERS; i++) { | |
198 | ret = get_partition_info_efi(dev_desc, i, info); | |
199 | if (ret != 0) { | |
200 | /* no more entries in table */ | |
201 | return -1; | |
202 | } | |
203 | if (strcmp(name, (const char *)info->name) == 0) { | |
204 | /* matched */ | |
205 | return 0; | |
206 | } | |
207 | } | |
208 | return -2; | |
209 | } | |
210 | ||
211 | int test_part_efi(block_dev_desc_t * dev_desc) | |
212 | { | |
213 | ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); | |
214 | ||
215 | /* Read legacy MBR from block 0 and validate it */ | |
216 | if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) | |
217 | || (is_pmbr_valid(legacymbr) != 1)) { | |
218 | return -1; | |
219 | } | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /** | |
224 | * set_protective_mbr(): Set the EFI protective MBR | |
225 | * @param dev_desc - block device descriptor | |
226 | * | |
227 | * @return - zero on success, otherwise error | |
228 | */ | |
229 | static int set_protective_mbr(block_dev_desc_t *dev_desc) | |
230 | { | |
231 | /* Setup the Protective MBR */ | |
232 | ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1); | |
233 | memset(p_mbr, 0, sizeof(*p_mbr)); | |
234 | ||
235 | if (p_mbr == NULL) { | |
236 | printf("%s: calloc failed!\n", __func__); | |
237 | return -1; | |
238 | } | |
239 | /* Append signature */ | |
240 | p_mbr->signature = MSDOS_MBR_SIGNATURE; | |
241 | p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT; | |
242 | p_mbr->partition_record[0].start_sect = 1; | |
243 | p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba; | |
244 | ||
245 | /* Write MBR sector to the MMC device */ | |
246 | if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) { | |
247 | printf("** Can't write to device %d **\n", | |
248 | dev_desc->dev); | |
249 | return -1; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | int write_gpt_table(block_dev_desc_t *dev_desc, | |
256 | gpt_header *gpt_h, gpt_entry *gpt_e) | |
257 | { | |
258 | const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries | |
259 | * sizeof(gpt_entry)), dev_desc); | |
260 | u32 calc_crc32; | |
261 | u64 val; | |
262 | ||
263 | debug("max lba: %x\n", (u32) dev_desc->lba); | |
264 | /* Setup the Protective MBR */ | |
265 | if (set_protective_mbr(dev_desc) < 0) | |
266 | goto err; | |
267 | ||
268 | /* Generate CRC for the Primary GPT Header */ | |
269 | calc_crc32 = efi_crc32((const unsigned char *)gpt_e, | |
270 | le32_to_cpu(gpt_h->num_partition_entries) * | |
271 | le32_to_cpu(gpt_h->sizeof_partition_entry)); | |
272 | gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); | |
273 | ||
274 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
275 | le32_to_cpu(gpt_h->header_size)); | |
276 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
277 | ||
278 | /* Write the First GPT to the block right after the Legacy MBR */ | |
279 | if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1) | |
280 | goto err; | |
281 | ||
282 | if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e) | |
283 | != pte_blk_cnt) | |
284 | goto err; | |
285 | ||
286 | /* recalculate the values for the Backup GPT Header */ | |
287 | val = le64_to_cpu(gpt_h->my_lba); | |
288 | gpt_h->my_lba = gpt_h->alternate_lba; | |
289 | gpt_h->alternate_lba = cpu_to_le64(val); | |
290 | gpt_h->header_crc32 = 0; | |
291 | ||
292 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
293 | le32_to_cpu(gpt_h->header_size)); | |
294 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
295 | ||
296 | if (dev_desc->block_write(dev_desc->dev, | |
297 | (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba) | |
298 | + 1, | |
299 | pte_blk_cnt, gpt_e) != pte_blk_cnt) | |
300 | goto err; | |
301 | ||
302 | if (dev_desc->block_write(dev_desc->dev, | |
303 | (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1, | |
304 | gpt_h) != 1) | |
305 | goto err; | |
306 | ||
307 | debug("GPT successfully written to block device!\n"); | |
308 | return 0; | |
309 | ||
310 | err: | |
311 | printf("** Can't write to device %d **\n", dev_desc->dev); | |
312 | return -1; | |
313 | } | |
314 | ||
315 | int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, | |
316 | disk_partition_t *partitions, int parts) | |
317 | { | |
318 | lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba); | |
319 | lbaint_t start; | |
320 | lbaint_t last_usable_lba = (lbaint_t) | |
321 | le64_to_cpu(gpt_h->last_usable_lba); | |
322 | int i, k; | |
323 | size_t efiname_len, dosname_len; | |
324 | #ifdef CONFIG_PARTITION_UUIDS | |
325 | char *str_uuid; | |
326 | unsigned char *bin_uuid; | |
327 | #endif | |
328 | ||
329 | for (i = 0; i < parts; i++) { | |
330 | /* partition starting lba */ | |
331 | start = partitions[i].start; | |
332 | if (start && (start < offset)) { | |
333 | printf("Partition overlap\n"); | |
334 | return -1; | |
335 | } | |
336 | if (start) { | |
337 | gpt_e[i].starting_lba = cpu_to_le64(start); | |
338 | offset = start + partitions[i].size; | |
339 | } else { | |
340 | gpt_e[i].starting_lba = cpu_to_le64(offset); | |
341 | offset += partitions[i].size; | |
342 | } | |
343 | if (offset >= last_usable_lba) { | |
344 | printf("Partitions layout exceds disk size\n"); | |
345 | return -1; | |
346 | } | |
347 | /* partition ending lba */ | |
348 | if ((i == parts - 1) && (partitions[i].size == 0)) | |
349 | /* extend the last partition to maximuim */ | |
350 | gpt_e[i].ending_lba = gpt_h->last_usable_lba; | |
351 | else | |
352 | gpt_e[i].ending_lba = cpu_to_le64(offset - 1); | |
353 | ||
354 | /* partition type GUID */ | |
355 | memcpy(gpt_e[i].partition_type_guid.b, | |
356 | &PARTITION_BASIC_DATA_GUID, 16); | |
357 | ||
358 | #ifdef CONFIG_PARTITION_UUIDS | |
359 | str_uuid = partitions[i].uuid; | |
360 | bin_uuid = gpt_e[i].unique_partition_guid.b; | |
361 | ||
362 | if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) { | |
363 | printf("Partition no. %d: invalid guid: %s\n", | |
364 | i, str_uuid); | |
365 | return -1; | |
366 | } | |
367 | #endif | |
368 | ||
369 | /* partition attributes */ | |
370 | memset(&gpt_e[i].attributes, 0, | |
371 | sizeof(gpt_entry_attributes)); | |
372 | ||
373 | /* partition name */ | |
374 | efiname_len = sizeof(gpt_e[i].partition_name) | |
375 | / sizeof(efi_char16_t); | |
376 | dosname_len = sizeof(partitions[i].name); | |
377 | ||
378 | memset(gpt_e[i].partition_name, 0, | |
379 | sizeof(gpt_e[i].partition_name)); | |
380 | ||
381 | for (k = 0; k < min(dosname_len, efiname_len); k++) | |
382 | gpt_e[i].partition_name[k] = | |
383 | (efi_char16_t)(partitions[i].name[k]); | |
384 | ||
385 | debug("%s: name: %s offset[%d]: 0x" LBAF | |
386 | " size[%d]: 0x" LBAF "\n", | |
387 | __func__, partitions[i].name, i, | |
388 | offset, i, partitions[i].size); | |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h, | |
395 | char *str_guid, int parts_count) | |
396 | { | |
397 | gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); | |
398 | gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); | |
399 | gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); | |
400 | gpt_h->my_lba = cpu_to_le64(1); | |
401 | gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); | |
402 | gpt_h->first_usable_lba = cpu_to_le64(34); | |
403 | gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); | |
404 | gpt_h->partition_entry_lba = cpu_to_le64(2); | |
405 | gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); | |
406 | gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); | |
407 | gpt_h->header_crc32 = 0; | |
408 | gpt_h->partition_entry_array_crc32 = 0; | |
409 | ||
410 | if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID)) | |
411 | return -1; | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid, | |
417 | disk_partition_t *partitions, int parts_count) | |
418 | { | |
419 | int ret; | |
420 | ||
421 | gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header), | |
422 | dev_desc)); | |
423 | gpt_entry *gpt_e; | |
424 | ||
425 | if (gpt_h == NULL) { | |
426 | printf("%s: calloc failed!\n", __func__); | |
427 | return -1; | |
428 | } | |
429 | ||
430 | gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS | |
431 | * sizeof(gpt_entry), | |
432 | dev_desc)); | |
433 | if (gpt_e == NULL) { | |
434 | printf("%s: calloc failed!\n", __func__); | |
435 | free(gpt_h); | |
436 | return -1; | |
437 | } | |
438 | ||
439 | /* Generate Primary GPT header (LBA1) */ | |
440 | ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); | |
441 | if (ret) | |
442 | goto err; | |
443 | ||
444 | /* Generate partition entries */ | |
445 | ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count); | |
446 | if (ret) | |
447 | goto err; | |
448 | ||
449 | /* Write GPT partition table */ | |
450 | ret = write_gpt_table(dev_desc, gpt_h, gpt_e); | |
451 | ||
452 | err: | |
453 | free(gpt_e); | |
454 | free(gpt_h); | |
455 | return ret; | |
456 | } | |
457 | #endif | |
458 | ||
459 | /* | |
460 | * Private functions | |
461 | */ | |
462 | /* | |
463 | * pmbr_part_valid(): Check for EFI partition signature | |
464 | * | |
465 | * Returns: 1 if EFI GPT partition type is found. | |
466 | */ | |
467 | static int pmbr_part_valid(struct partition *part) | |
468 | { | |
469 | if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && | |
470 | get_unaligned_le32(&part->start_sect) == 1UL) { | |
471 | return 1; | |
472 | } | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /* | |
478 | * is_pmbr_valid(): test Protective MBR for validity | |
479 | * | |
480 | * Returns: 1 if PMBR is valid, 0 otherwise. | |
481 | * Validity depends on two things: | |
482 | * 1) MSDOS signature is in the last two bytes of the MBR | |
483 | * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() | |
484 | */ | |
485 | static int is_pmbr_valid(legacy_mbr * mbr) | |
486 | { | |
487 | int i = 0; | |
488 | ||
489 | if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) | |
490 | return 0; | |
491 | ||
492 | for (i = 0; i < 4; i++) { | |
493 | if (pmbr_part_valid(&mbr->partition_record[i])) { | |
494 | return 1; | |
495 | } | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
500 | /** | |
501 | * is_gpt_valid() - tests one GPT header and PTEs for validity | |
502 | * | |
503 | * lba is the logical block address of the GPT header to test | |
504 | * gpt is a GPT header ptr, filled on return. | |
505 | * ptes is a PTEs ptr, filled on return. | |
506 | * | |
507 | * Description: returns 1 if valid, 0 on error. | |
508 | * If valid, returns pointers to PTEs. | |
509 | */ | |
510 | static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba, | |
511 | gpt_header *pgpt_head, gpt_entry **pgpt_pte) | |
512 | { | |
513 | u32 crc32_backup = 0; | |
514 | u32 calc_crc32; | |
515 | u64 lastlba; | |
516 | ||
517 | if (!dev_desc || !pgpt_head) { | |
518 | printf("%s: Invalid Argument(s)\n", __func__); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | /* Read GPT Header from device */ | |
523 | if (dev_desc->block_read(dev_desc->dev, (lbaint_t)lba, 1, pgpt_head) | |
524 | != 1) { | |
525 | printf("*** ERROR: Can't read GPT header ***\n"); | |
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Check the GPT header signature */ | |
530 | if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { | |
531 | printf("GUID Partition Table Header signature is wrong:" | |
532 | "0x%llX != 0x%llX\n", | |
533 | le64_to_cpu(pgpt_head->signature), | |
534 | GPT_HEADER_SIGNATURE); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /* Check the GUID Partition Table CRC */ | |
539 | memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup)); | |
540 | memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); | |
541 | ||
542 | calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, | |
543 | le32_to_cpu(pgpt_head->header_size)); | |
544 | ||
545 | memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup)); | |
546 | ||
547 | if (calc_crc32 != le32_to_cpu(crc32_backup)) { | |
548 | printf("GUID Partition Table Header CRC is wrong:" | |
549 | "0x%x != 0x%x\n", | |
550 | le32_to_cpu(crc32_backup), calc_crc32); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /* Check that the my_lba entry points to the LBA that contains the GPT */ | |
555 | if (le64_to_cpu(pgpt_head->my_lba) != lba) { | |
556 | printf("GPT: my_lba incorrect: %llX != %llX\n", | |
557 | le64_to_cpu(pgpt_head->my_lba), | |
558 | lba); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | /* Check the first_usable_lba and last_usable_lba are within the disk. */ | |
563 | lastlba = (u64)dev_desc->lba; | |
564 | if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) { | |
565 | printf("GPT: first_usable_lba incorrect: %llX > %llX\n", | |
566 | le64_to_cpu(pgpt_head->first_usable_lba), lastlba); | |
567 | return 0; | |
568 | } | |
569 | if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) { | |
570 | printf("GPT: last_usable_lba incorrect: %llX > %llX\n", | |
571 | le64_to_cpu(pgpt_head->last_usable_lba), lastlba); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", | |
576 | le64_to_cpu(pgpt_head->first_usable_lba), | |
577 | le64_to_cpu(pgpt_head->last_usable_lba), lastlba); | |
578 | ||
579 | /* Read and allocate Partition Table Entries */ | |
580 | *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); | |
581 | if (*pgpt_pte == NULL) { | |
582 | printf("GPT: Failed to allocate memory for PTE\n"); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | /* Check the GUID Partition Table Entry Array CRC */ | |
587 | calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, | |
588 | le32_to_cpu(pgpt_head->num_partition_entries) * | |
589 | le32_to_cpu(pgpt_head->sizeof_partition_entry)); | |
590 | ||
591 | if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) { | |
592 | printf("GUID Partition Table Entry Array CRC is wrong:" | |
593 | "0x%x != 0x%x\n", | |
594 | le32_to_cpu(pgpt_head->partition_entry_array_crc32), | |
595 | calc_crc32); | |
596 | ||
597 | free(*pgpt_pte); | |
598 | return 0; | |
599 | } | |
600 | ||
601 | /* We're done, all's well */ | |
602 | return 1; | |
603 | } | |
604 | ||
605 | /** | |
606 | * alloc_read_gpt_entries(): reads partition entries from disk | |
607 | * @dev_desc | |
608 | * @gpt - GPT header | |
609 | * | |
610 | * Description: Returns ptes on success, NULL on error. | |
611 | * Allocates space for PTEs based on information found in @gpt. | |
612 | * Notes: remember to free pte when you're done! | |
613 | */ | |
614 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, | |
615 | gpt_header * pgpt_head) | |
616 | { | |
617 | size_t count = 0, blk_cnt; | |
618 | gpt_entry *pte = NULL; | |
619 | ||
620 | if (!dev_desc || !pgpt_head) { | |
621 | printf("%s: Invalid Argument(s)\n", __func__); | |
622 | return NULL; | |
623 | } | |
624 | ||
625 | count = le32_to_cpu(pgpt_head->num_partition_entries) * | |
626 | le32_to_cpu(pgpt_head->sizeof_partition_entry); | |
627 | ||
628 | debug("%s: count = %u * %u = %zu\n", __func__, | |
629 | (u32) le32_to_cpu(pgpt_head->num_partition_entries), | |
630 | (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); | |
631 | ||
632 | /* Allocate memory for PTE, remember to FREE */ | |
633 | if (count != 0) { | |
634 | pte = memalign(ARCH_DMA_MINALIGN, | |
635 | PAD_TO_BLOCKSIZE(count, dev_desc)); | |
636 | } | |
637 | ||
638 | if (count == 0 || pte == NULL) { | |
639 | printf("%s: ERROR: Can't allocate 0x%zX " | |
640 | "bytes for GPT Entries\n", | |
641 | __func__, count); | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | /* Read GPT Entries from device */ | |
646 | blk_cnt = BLOCK_CNT(count, dev_desc); | |
647 | if (dev_desc->block_read (dev_desc->dev, | |
648 | (lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba), | |
649 | (lbaint_t) (blk_cnt), pte) | |
650 | != blk_cnt) { | |
651 | ||
652 | printf("*** ERROR: Can't read GPT Entries ***\n"); | |
653 | free(pte); | |
654 | return NULL; | |
655 | } | |
656 | return pte; | |
657 | } | |
658 | ||
659 | /** | |
660 | * is_pte_valid(): validates a single Partition Table Entry | |
661 | * @gpt_entry - Pointer to a single Partition Table Entry | |
662 | * | |
663 | * Description: returns 1 if valid, 0 on error. | |
664 | */ | |
665 | static int is_pte_valid(gpt_entry * pte) | |
666 | { | |
667 | efi_guid_t unused_guid; | |
668 | ||
669 | if (!pte) { | |
670 | printf("%s: Invalid Argument(s)\n", __func__); | |
671 | return 0; | |
672 | } | |
673 | ||
674 | /* Only one validation for now: | |
675 | * The GUID Partition Type != Unused Entry (ALL-ZERO) | |
676 | */ | |
677 | memset(unused_guid.b, 0, sizeof(unused_guid.b)); | |
678 | ||
679 | if (memcmp(pte->partition_type_guid.b, unused_guid.b, | |
680 | sizeof(unused_guid.b)) == 0) { | |
681 | ||
682 | debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, | |
683 | (unsigned int)(uintptr_t)pte); | |
684 | ||
685 | return 0; | |
686 | } else { | |
687 | return 1; | |
688 | } | |
689 | } | |
690 | #endif |