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Commit | Line | Data |
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07f3d789 | 1 | /* |
2 | * Copyright (C) 2008 RuggedCom, Inc. | |
3 | * Richard Retanubun <RichardRetanubun@RuggedCom.com> | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
07f3d789 | 6 | */ |
7 | ||
8 | /* | |
6d0f6bcf | 9 | * Problems with CONFIG_SYS_64BIT_LBA: |
07f3d789 | 10 | * |
11 | * struct disk_partition.start in include/part.h is sized as ulong. | |
6d0f6bcf | 12 | * When CONFIG_SYS_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t. |
07f3d789 | 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 | */ | |
8faefadb | 17 | #include <asm/unaligned.h> |
07f3d789 | 18 | #include <common.h> |
19 | #include <command.h> | |
20 | #include <ide.h> | |
21 | #include <malloc.h> | |
fae2bf22 | 22 | #include <part_efi.h> |
6eecc030 | 23 | #include <linux/ctype.h> |
07f3d789 | 24 | |
40684ddb ŁM |
25 | DECLARE_GLOBAL_DATA_PTR; |
26 | ||
2c1af9dc | 27 | #ifdef HAVE_BLOCK_DEVICE |
07f3d789 | 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 | */ | |
fae2bf22 | 35 | static inline u32 efi_crc32(const void *buf, u32 len) |
07f3d789 | 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); | |
07f3d789 | 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); | |
07f3d789 | 48 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, |
49 | gpt_header * pgpt_head); | |
07f3d789 | 50 | static int is_pte_valid(gpt_entry * pte); |
51 | ||
6eecc030 LW |
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 | ||
f07cd2c4 SW |
66 | static void uuid_string(unsigned char *uuid, char *str) |
67 | { | |
68 | static const u8 le[16] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, | |
69 | 12, 13, 14, 15}; | |
70 | int i; | |
71 | ||
72 | for (i = 0; i < 16; i++) { | |
73 | sprintf(str, "%02x", uuid[le[i]]); | |
74 | str += 2; | |
75 | switch (i) { | |
76 | case 3: | |
77 | case 5: | |
78 | case 7: | |
79 | case 9: | |
80 | *str++ = '-'; | |
81 | break; | |
82 | } | |
83 | } | |
84 | } | |
85 | ||
b4414f4a SW |
86 | static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; |
87 | ||
88 | static inline int is_bootable(gpt_entry *p) | |
89 | { | |
90 | return p->attributes.fields.legacy_bios_bootable || | |
91 | !memcmp(&(p->partition_type_guid), &system_guid, | |
92 | sizeof(efi_guid_t)); | |
93 | } | |
94 | ||
40684ddb | 95 | #ifdef CONFIG_EFI_PARTITION |
07f3d789 | 96 | /* |
97 | * Public Functions (include/part.h) | |
98 | */ | |
99 | ||
100 | void print_part_efi(block_dev_desc_t * dev_desc) | |
101 | { | |
ae1768a7 | 102 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); |
deb5ca80 | 103 | gpt_entry *gpt_pte = NULL; |
07f3d789 | 104 | int i = 0; |
f07cd2c4 | 105 | char uuid[37]; |
07f3d789 | 106 | |
107 | if (!dev_desc) { | |
df70b1c2 | 108 | printf("%s: Invalid Argument(s)\n", __func__); |
07f3d789 | 109 | return; |
110 | } | |
111 | /* This function validates AND fills in the GPT header and PTE */ | |
112 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
4715a811 | 113 | gpt_head, &gpt_pte) != 1) { |
df70b1c2 | 114 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); |
07f3d789 | 115 | return; |
116 | } | |
117 | ||
deb5ca80 | 118 | debug("%s: gpt-entry at %p\n", __func__, gpt_pte); |
07f3d789 | 119 | |
788a8c1f | 120 | printf("Part\tStart LBA\tEnd LBA\t\tName\n"); |
13bf2f55 | 121 | printf("\tAttributes\n"); |
f07cd2c4 SW |
122 | printf("\tType UUID\n"); |
123 | printf("\tPartition UUID\n"); | |
124 | ||
fae2bf22 | 125 | for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { |
38a3021e SW |
126 | /* Stop at the first non valid PTE */ |
127 | if (!is_pte_valid(&gpt_pte[i])) | |
128 | break; | |
129 | ||
788a8c1f | 130 | printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), |
fae2bf22 CHP |
131 | le64_to_cpu(gpt_pte[i].starting_lba), |
132 | le64_to_cpu(gpt_pte[i].ending_lba), | |
788a8c1f | 133 | print_efiname(&gpt_pte[i])); |
13bf2f55 | 134 | printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); |
f07cd2c4 SW |
135 | uuid_string(gpt_pte[i].partition_type_guid.b, uuid); |
136 | printf("\ttype:\t%s\n", uuid); | |
137 | uuid_string(gpt_pte[i].unique_partition_guid.b, uuid); | |
138 | printf("\tuuid:\t%s\n", uuid); | |
07f3d789 | 139 | } |
140 | ||
141 | /* Remember to free pte */ | |
deb5ca80 | 142 | free(gpt_pte); |
07f3d789 | 143 | return; |
144 | } | |
145 | ||
146 | int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, | |
147 | disk_partition_t * info) | |
148 | { | |
ae1768a7 | 149 | ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz); |
deb5ca80 | 150 | gpt_entry *gpt_pte = NULL; |
07f3d789 | 151 | |
152 | /* "part" argument must be at least 1 */ | |
153 | if (!dev_desc || !info || part < 1) { | |
df70b1c2 | 154 | printf("%s: Invalid Argument(s)\n", __func__); |
07f3d789 | 155 | return -1; |
156 | } | |
157 | ||
158 | /* This function validates AND fills in the GPT header and PTE */ | |
159 | if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
4715a811 | 160 | gpt_head, &gpt_pte) != 1) { |
df70b1c2 | 161 | printf("%s: *** ERROR: Invalid GPT ***\n", __func__); |
07f3d789 | 162 | return -1; |
163 | } | |
164 | ||
fae2bf22 | 165 | if (part > le32_to_cpu(gpt_head->num_partition_entries) || |
c04d68c6 | 166 | !is_pte_valid(&gpt_pte[part - 1])) { |
6d2ee5a3 | 167 | debug("%s: *** ERROR: Invalid partition number %d ***\n", |
c04d68c6 | 168 | __func__, part); |
6d2ee5a3 | 169 | free(gpt_pte); |
c04d68c6 SW |
170 | return -1; |
171 | } | |
172 | ||
07f3d789 | 173 | /* The ulong casting limits the maximum disk size to 2 TB */ |
fae2bf22 | 174 | info->start = (u64)le64_to_cpu(gpt_pte[part - 1].starting_lba); |
50970839 | 175 | /* The ending LBA is inclusive, to calculate size, add 1 to it */ |
fae2bf22 | 176 | info->size = ((u64)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1) |
50970839 | 177 | - info->start; |
ae1768a7 | 178 | info->blksz = dev_desc->blksz; |
07f3d789 | 179 | |
6eecc030 | 180 | sprintf((char *)info->name, "%s", |
deb5ca80 | 181 | print_efiname(&gpt_pte[part - 1])); |
07f3d789 | 182 | sprintf((char *)info->type, "U-Boot"); |
b4414f4a | 183 | info->bootable = is_bootable(&gpt_pte[part - 1]); |
894bfbbf SW |
184 | #ifdef CONFIG_PARTITION_UUIDS |
185 | uuid_string(gpt_pte[part - 1].unique_partition_guid.b, info->uuid); | |
186 | #endif | |
07f3d789 | 187 | |
04735e9c FL |
188 | debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s", __func__, |
189 | info->start, info->size, info->name); | |
07f3d789 | 190 | |
191 | /* Remember to free pte */ | |
deb5ca80 | 192 | free(gpt_pte); |
07f3d789 | 193 | return 0; |
194 | } | |
195 | ||
196 | int test_part_efi(block_dev_desc_t * dev_desc) | |
197 | { | |
ae1768a7 | 198 | ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz); |
07f3d789 | 199 | |
200 | /* Read legacy MBR from block 0 and validate it */ | |
f75dd584 A |
201 | if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) |
202 | || (is_pmbr_valid(legacymbr) != 1)) { | |
07f3d789 | 203 | return -1; |
204 | } | |
205 | return 0; | |
206 | } | |
207 | ||
40684ddb ŁM |
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 | legacy_mbr *p_mbr; | |
217 | ||
218 | /* Setup the Protective MBR */ | |
219 | p_mbr = calloc(1, sizeof(p_mbr)); | |
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 | free(p_mbr); | |
235 | return -1; | |
236 | } | |
237 | ||
238 | free(p_mbr); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /** | |
243 | * string_uuid(); Convert UUID stored as string to bytes | |
244 | * | |
245 | * @param uuid - UUID represented as string | |
246 | * @param dst - GUID buffer | |
247 | * | |
248 | * @return return 0 on successful conversion | |
249 | */ | |
250 | static int string_uuid(char *uuid, u8 *dst) | |
251 | { | |
252 | efi_guid_t guid; | |
253 | u16 b, c, d; | |
254 | u64 e; | |
255 | u32 a; | |
256 | u8 *p; | |
257 | u8 i; | |
258 | ||
259 | const u8 uuid_str_len = 36; | |
260 | ||
261 | /* The UUID is written in text: */ | |
262 | /* 1 9 14 19 24 */ | |
263 | /* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx */ | |
264 | ||
265 | debug("%s: uuid: %s\n", __func__, uuid); | |
266 | ||
267 | if (strlen(uuid) != uuid_str_len) | |
268 | return -1; | |
269 | ||
270 | for (i = 0; i < uuid_str_len; i++) { | |
271 | if ((i == 8) || (i == 13) || (i == 18) || (i == 23)) { | |
272 | if (uuid[i] != '-') | |
273 | return -1; | |
274 | } else { | |
275 | if (!isxdigit(uuid[i])) | |
276 | return -1; | |
277 | } | |
278 | } | |
279 | ||
280 | a = (u32)simple_strtoul(uuid, NULL, 16); | |
281 | b = (u16)simple_strtoul(uuid + 9, NULL, 16); | |
282 | c = (u16)simple_strtoul(uuid + 14, NULL, 16); | |
283 | d = (u16)simple_strtoul(uuid + 19, NULL, 16); | |
284 | e = (u64)simple_strtoull(uuid + 24, NULL, 16); | |
285 | ||
286 | p = (u8 *) &e; | |
287 | guid = EFI_GUID(a, b, c, d >> 8, d & 0xFF, | |
288 | *(p + 5), *(p + 4), *(p + 3), | |
289 | *(p + 2), *(p + 1) , *p); | |
290 | ||
291 | memcpy(dst, guid.b, sizeof(efi_guid_t)); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | int write_gpt_table(block_dev_desc_t *dev_desc, | |
297 | gpt_header *gpt_h, gpt_entry *gpt_e) | |
298 | { | |
ae1768a7 EE |
299 | const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries |
300 | * sizeof(gpt_entry)), dev_desc); | |
40684ddb ŁM |
301 | u32 calc_crc32; |
302 | u64 val; | |
303 | ||
304 | debug("max lba: %x\n", (u32) dev_desc->lba); | |
305 | /* Setup the Protective MBR */ | |
306 | if (set_protective_mbr(dev_desc) < 0) | |
307 | goto err; | |
308 | ||
309 | /* Generate CRC for the Primary GPT Header */ | |
310 | calc_crc32 = efi_crc32((const unsigned char *)gpt_e, | |
311 | le32_to_cpu(gpt_h->num_partition_entries) * | |
312 | le32_to_cpu(gpt_h->sizeof_partition_entry)); | |
313 | gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32); | |
314 | ||
315 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
316 | le32_to_cpu(gpt_h->header_size)); | |
317 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
318 | ||
319 | /* Write the First GPT to the block right after the Legacy MBR */ | |
320 | if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1) | |
321 | goto err; | |
322 | ||
ae1768a7 EE |
323 | if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e) |
324 | != pte_blk_cnt) | |
40684ddb ŁM |
325 | goto err; |
326 | ||
327 | /* recalculate the values for the Second GPT Header */ | |
328 | val = le64_to_cpu(gpt_h->my_lba); | |
329 | gpt_h->my_lba = gpt_h->alternate_lba; | |
330 | gpt_h->alternate_lba = cpu_to_le64(val); | |
331 | gpt_h->header_crc32 = 0; | |
332 | ||
333 | calc_crc32 = efi_crc32((const unsigned char *)gpt_h, | |
334 | le32_to_cpu(gpt_h->header_size)); | |
335 | gpt_h->header_crc32 = cpu_to_le32(calc_crc32); | |
336 | ||
337 | if (dev_desc->block_write(dev_desc->dev, | |
338 | le32_to_cpu(gpt_h->last_usable_lba + 1), | |
ae1768a7 | 339 | pte_blk_cnt, gpt_e) != pte_blk_cnt) |
40684ddb ŁM |
340 | goto err; |
341 | ||
342 | if (dev_desc->block_write(dev_desc->dev, | |
343 | le32_to_cpu(gpt_h->my_lba), 1, gpt_h) != 1) | |
344 | goto err; | |
345 | ||
346 | debug("GPT successfully written to block device!\n"); | |
347 | return 0; | |
348 | ||
349 | err: | |
350 | printf("** Can't write to device %d **\n", dev_desc->dev); | |
351 | return -1; | |
352 | } | |
353 | ||
354 | int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e, | |
355 | disk_partition_t *partitions, int parts) | |
356 | { | |
357 | u32 offset = (u32)le32_to_cpu(gpt_h->first_usable_lba); | |
358 | ulong start; | |
359 | int i, k; | |
67cd4a63 | 360 | size_t efiname_len, dosname_len; |
40684ddb ŁM |
361 | #ifdef CONFIG_PARTITION_UUIDS |
362 | char *str_uuid; | |
363 | #endif | |
364 | ||
365 | for (i = 0; i < parts; i++) { | |
366 | /* partition starting lba */ | |
367 | start = partitions[i].start; | |
368 | if (start && (start < offset)) { | |
369 | printf("Partition overlap\n"); | |
370 | return -1; | |
371 | } | |
372 | if (start) { | |
373 | gpt_e[i].starting_lba = cpu_to_le64(start); | |
374 | offset = start + partitions[i].size; | |
375 | } else { | |
376 | gpt_e[i].starting_lba = cpu_to_le64(offset); | |
377 | offset += partitions[i].size; | |
378 | } | |
379 | if (offset >= gpt_h->last_usable_lba) { | |
380 | printf("Partitions layout exceds disk size\n"); | |
381 | return -1; | |
382 | } | |
383 | /* partition ending lba */ | |
384 | if ((i == parts - 1) && (partitions[i].size == 0)) | |
385 | /* extend the last partition to maximuim */ | |
386 | gpt_e[i].ending_lba = gpt_h->last_usable_lba; | |
387 | else | |
388 | gpt_e[i].ending_lba = cpu_to_le64(offset - 1); | |
389 | ||
390 | /* partition type GUID */ | |
391 | memcpy(gpt_e[i].partition_type_guid.b, | |
392 | &PARTITION_BASIC_DATA_GUID, 16); | |
393 | ||
394 | #ifdef CONFIG_PARTITION_UUIDS | |
395 | str_uuid = partitions[i].uuid; | |
396 | if (string_uuid(str_uuid, gpt_e[i].unique_partition_guid.b)) { | |
397 | printf("Partition no. %d: invalid guid: %s\n", | |
398 | i, str_uuid); | |
399 | return -1; | |
400 | } | |
401 | #endif | |
402 | ||
403 | /* partition attributes */ | |
404 | memset(&gpt_e[i].attributes, 0, | |
405 | sizeof(gpt_entry_attributes)); | |
406 | ||
407 | /* partition name */ | |
67cd4a63 | 408 | efiname_len = sizeof(gpt_e[i].partition_name) |
40684ddb | 409 | / sizeof(efi_char16_t); |
67cd4a63 MV |
410 | dosname_len = sizeof(partitions[i].name); |
411 | ||
412 | memset(gpt_e[i].partition_name, 0, | |
413 | sizeof(gpt_e[i].partition_name)); | |
414 | ||
415 | for (k = 0; k < min(dosname_len, efiname_len); k++) | |
40684ddb ŁM |
416 | gpt_e[i].partition_name[k] = |
417 | (efi_char16_t)(partitions[i].name[k]); | |
418 | ||
04735e9c | 419 | debug("%s: name: %s offset[%d]: 0x%x size[%d]: 0x" LBAF "\n", |
40684ddb ŁM |
420 | __func__, partitions[i].name, i, |
421 | offset, i, partitions[i].size); | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h, | |
428 | char *str_guid, int parts_count) | |
429 | { | |
430 | gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); | |
431 | gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1); | |
432 | gpt_h->header_size = cpu_to_le32(sizeof(gpt_header)); | |
433 | gpt_h->my_lba = cpu_to_le64(1); | |
434 | gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1); | |
435 | gpt_h->first_usable_lba = cpu_to_le64(34); | |
436 | gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34); | |
437 | gpt_h->partition_entry_lba = cpu_to_le64(2); | |
438 | gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS); | |
439 | gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry)); | |
440 | gpt_h->header_crc32 = 0; | |
441 | gpt_h->partition_entry_array_crc32 = 0; | |
442 | ||
443 | if (string_uuid(str_guid, gpt_h->disk_guid.b)) | |
444 | return -1; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid, | |
450 | disk_partition_t *partitions, int parts_count) | |
451 | { | |
452 | int ret; | |
453 | ||
ae1768a7 EE |
454 | gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header), |
455 | dev_desc)); | |
456 | gpt_entry *gpt_e; | |
457 | ||
40684ddb ŁM |
458 | if (gpt_h == NULL) { |
459 | printf("%s: calloc failed!\n", __func__); | |
460 | return -1; | |
461 | } | |
462 | ||
ae1768a7 EE |
463 | gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS |
464 | * sizeof(gpt_entry), | |
465 | dev_desc)); | |
40684ddb ŁM |
466 | if (gpt_e == NULL) { |
467 | printf("%s: calloc failed!\n", __func__); | |
468 | free(gpt_h); | |
469 | return -1; | |
470 | } | |
471 | ||
472 | /* Generate Primary GPT header (LBA1) */ | |
473 | ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count); | |
474 | if (ret) | |
475 | goto err; | |
476 | ||
477 | /* Generate partition entries */ | |
478 | ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count); | |
479 | if (ret) | |
480 | goto err; | |
481 | ||
482 | /* Write GPT partition table */ | |
483 | ret = write_gpt_table(dev_desc, gpt_h, gpt_e); | |
484 | ||
485 | err: | |
486 | free(gpt_e); | |
487 | free(gpt_h); | |
488 | return ret; | |
489 | } | |
490 | #endif | |
491 | ||
07f3d789 | 492 | /* |
493 | * Private functions | |
494 | */ | |
495 | /* | |
496 | * pmbr_part_valid(): Check for EFI partition signature | |
497 | * | |
498 | * Returns: 1 if EFI GPT partition type is found. | |
499 | */ | |
500 | static int pmbr_part_valid(struct partition *part) | |
501 | { | |
502 | if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && | |
8faefadb | 503 | get_unaligned_le32(&part->start_sect) == 1UL) { |
07f3d789 | 504 | return 1; |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | /* | |
511 | * is_pmbr_valid(): test Protective MBR for validity | |
512 | * | |
513 | * Returns: 1 if PMBR is valid, 0 otherwise. | |
514 | * Validity depends on two things: | |
515 | * 1) MSDOS signature is in the last two bytes of the MBR | |
516 | * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() | |
517 | */ | |
518 | static int is_pmbr_valid(legacy_mbr * mbr) | |
519 | { | |
520 | int i = 0; | |
521 | ||
fae2bf22 | 522 | if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) |
07f3d789 | 523 | return 0; |
07f3d789 | 524 | |
525 | for (i = 0; i < 4; i++) { | |
526 | if (pmbr_part_valid(&mbr->partition_record[i])) { | |
527 | return 1; | |
528 | } | |
529 | } | |
530 | return 0; | |
531 | } | |
532 | ||
533 | /** | |
534 | * is_gpt_valid() - tests one GPT header and PTEs for validity | |
535 | * | |
536 | * lba is the logical block address of the GPT header to test | |
537 | * gpt is a GPT header ptr, filled on return. | |
538 | * ptes is a PTEs ptr, filled on return. | |
539 | * | |
540 | * Description: returns 1 if valid, 0 on error. | |
541 | * If valid, returns pointers to PTEs. | |
542 | */ | |
543 | static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, | |
544 | gpt_header * pgpt_head, gpt_entry ** pgpt_pte) | |
545 | { | |
fae2bf22 CHP |
546 | u32 crc32_backup = 0; |
547 | u32 calc_crc32; | |
07f3d789 | 548 | unsigned long long lastlba; |
549 | ||
550 | if (!dev_desc || !pgpt_head) { | |
df70b1c2 | 551 | printf("%s: Invalid Argument(s)\n", __func__); |
07f3d789 | 552 | return 0; |
553 | } | |
554 | ||
555 | /* Read GPT Header from device */ | |
556 | if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) { | |
557 | printf("*** ERROR: Can't read GPT header ***\n"); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | /* Check the GPT header signature */ | |
fae2bf22 | 562 | if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { |
07f3d789 | 563 | printf("GUID Partition Table Header signature is wrong:" |
564 | "0x%llX != 0x%llX\n", | |
fae2bf22 CHP |
565 | le64_to_cpu(pgpt_head->signature), |
566 | GPT_HEADER_SIGNATURE); | |
07f3d789 | 567 | return 0; |
568 | } | |
569 | ||
570 | /* Check the GUID Partition Table CRC */ | |
fae2bf22 CHP |
571 | memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup)); |
572 | memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); | |
07f3d789 | 573 | |
574 | calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, | |
fae2bf22 | 575 | le32_to_cpu(pgpt_head->header_size)); |
07f3d789 | 576 | |
fae2bf22 | 577 | memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup)); |
07f3d789 | 578 | |
fae2bf22 | 579 | if (calc_crc32 != le32_to_cpu(crc32_backup)) { |
07f3d789 | 580 | printf("GUID Partition Table Header CRC is wrong:" |
fae2bf22 CHP |
581 | "0x%x != 0x%x\n", |
582 | le32_to_cpu(crc32_backup), calc_crc32); | |
07f3d789 | 583 | return 0; |
584 | } | |
585 | ||
586 | /* Check that the my_lba entry points to the LBA that contains the GPT */ | |
fae2bf22 | 587 | if (le64_to_cpu(pgpt_head->my_lba) != lba) { |
07f3d789 | 588 | printf("GPT: my_lba incorrect: %llX != %llX\n", |
fae2bf22 CHP |
589 | le64_to_cpu(pgpt_head->my_lba), |
590 | lba); | |
07f3d789 | 591 | return 0; |
592 | } | |
593 | ||
594 | /* Check the first_usable_lba and last_usable_lba are within the disk. */ | |
595 | lastlba = (unsigned long long)dev_desc->lba; | |
fae2bf22 | 596 | if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) { |
07f3d789 | 597 | printf("GPT: first_usable_lba incorrect: %llX > %llX\n", |
fae2bf22 | 598 | le64_to_cpu(pgpt_head->first_usable_lba), lastlba); |
07f3d789 | 599 | return 0; |
600 | } | |
fae2bf22 | 601 | if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) { |
07f3d789 | 602 | printf("GPT: last_usable_lba incorrect: %llX > %llX\n", |
fae2bf22 | 603 | (u64) le64_to_cpu(pgpt_head->last_usable_lba), lastlba); |
07f3d789 | 604 | return 0; |
605 | } | |
606 | ||
607 | debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", | |
fae2bf22 CHP |
608 | le64_to_cpu(pgpt_head->first_usable_lba), |
609 | le64_to_cpu(pgpt_head->last_usable_lba), lastlba); | |
07f3d789 | 610 | |
611 | /* Read and allocate Partition Table Entries */ | |
612 | *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); | |
613 | if (*pgpt_pte == NULL) { | |
614 | printf("GPT: Failed to allocate memory for PTE\n"); | |
615 | return 0; | |
616 | } | |
617 | ||
618 | /* Check the GUID Partition Table Entry Array CRC */ | |
619 | calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, | |
fae2bf22 CHP |
620 | le32_to_cpu(pgpt_head->num_partition_entries) * |
621 | le32_to_cpu(pgpt_head->sizeof_partition_entry)); | |
07f3d789 | 622 | |
fae2bf22 | 623 | if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) { |
07f3d789 | 624 | printf("GUID Partition Table Entry Array CRC is wrong:" |
fae2bf22 CHP |
625 | "0x%x != 0x%x\n", |
626 | le32_to_cpu(pgpt_head->partition_entry_array_crc32), | |
07f3d789 | 627 | calc_crc32); |
628 | ||
deb5ca80 | 629 | free(*pgpt_pte); |
07f3d789 | 630 | return 0; |
631 | } | |
632 | ||
633 | /* We're done, all's well */ | |
634 | return 1; | |
635 | } | |
636 | ||
637 | /** | |
638 | * alloc_read_gpt_entries(): reads partition entries from disk | |
639 | * @dev_desc | |
640 | * @gpt - GPT header | |
641 | * | |
642 | * Description: Returns ptes on success, NULL on error. | |
643 | * Allocates space for PTEs based on information found in @gpt. | |
644 | * Notes: remember to free pte when you're done! | |
645 | */ | |
646 | static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, | |
647 | gpt_header * pgpt_head) | |
648 | { | |
ae1768a7 | 649 | size_t count = 0, blk_cnt; |
07f3d789 | 650 | gpt_entry *pte = NULL; |
651 | ||
652 | if (!dev_desc || !pgpt_head) { | |
df70b1c2 | 653 | printf("%s: Invalid Argument(s)\n", __func__); |
07f3d789 | 654 | return NULL; |
655 | } | |
656 | ||
fae2bf22 CHP |
657 | count = le32_to_cpu(pgpt_head->num_partition_entries) * |
658 | le32_to_cpu(pgpt_head->sizeof_partition_entry); | |
07f3d789 | 659 | |
fae2bf22 CHP |
660 | debug("%s: count = %u * %u = %zu\n", __func__, |
661 | (u32) le32_to_cpu(pgpt_head->num_partition_entries), | |
662 | (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); | |
07f3d789 | 663 | |
664 | /* Allocate memory for PTE, remember to FREE */ | |
665 | if (count != 0) { | |
ae1768a7 EE |
666 | pte = memalign(ARCH_DMA_MINALIGN, |
667 | PAD_TO_BLOCKSIZE(count, dev_desc)); | |
07f3d789 | 668 | } |
669 | ||
670 | if (count == 0 || pte == NULL) { | |
9936be31 TH |
671 | printf("%s: ERROR: Can't allocate 0x%zX " |
672 | "bytes for GPT Entries\n", | |
df70b1c2 | 673 | __func__, count); |
07f3d789 | 674 | return NULL; |
675 | } | |
676 | ||
677 | /* Read GPT Entries from device */ | |
ae1768a7 | 678 | blk_cnt = BLOCK_CNT(count, dev_desc); |
07f3d789 | 679 | if (dev_desc->block_read (dev_desc->dev, |
fae2bf22 | 680 | le64_to_cpu(pgpt_head->partition_entry_lba), |
ae1768a7 EE |
681 | (lbaint_t) (blk_cnt), pte) |
682 | != blk_cnt) { | |
07f3d789 | 683 | |
684 | printf("*** ERROR: Can't read GPT Entries ***\n"); | |
685 | free(pte); | |
686 | return NULL; | |
687 | } | |
688 | return pte; | |
689 | } | |
690 | ||
691 | /** | |
692 | * is_pte_valid(): validates a single Partition Table Entry | |
693 | * @gpt_entry - Pointer to a single Partition Table Entry | |
694 | * | |
695 | * Description: returns 1 if valid, 0 on error. | |
696 | */ | |
697 | static int is_pte_valid(gpt_entry * pte) | |
698 | { | |
699 | efi_guid_t unused_guid; | |
700 | ||
701 | if (!pte) { | |
df70b1c2 | 702 | printf("%s: Invalid Argument(s)\n", __func__); |
07f3d789 | 703 | return 0; |
704 | } | |
705 | ||
706 | /* Only one validation for now: | |
707 | * The GUID Partition Type != Unused Entry (ALL-ZERO) | |
708 | */ | |
709 | memset(unused_guid.b, 0, sizeof(unused_guid.b)); | |
710 | ||
711 | if (memcmp(pte->partition_type_guid.b, unused_guid.b, | |
712 | sizeof(unused_guid.b)) == 0) { | |
713 | ||
df70b1c2 | 714 | debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, |
9936be31 | 715 | (unsigned int)(uintptr_t)pte); |
07f3d789 | 716 | |
717 | return 0; | |
718 | } else { | |
719 | return 1; | |
720 | } | |
721 | } | |
722 | #endif |