1 /* 2 * Copyright (C) 2008 RuggedCom, Inc. 3 * Richard Retanubun <RichardRetanubun@RuggedCom.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /* 25 * Problems with CONFIG_SYS_64BIT_LBA: 26 * 27 * struct disk_partition.start in include/part.h is sized as ulong. 28 * When CONFIG_SYS_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t. 29 * For now, it is cast back to ulong at assignment. 30 * 31 * This limits the maximum size of addressable storage to < 2 Terra Bytes 32 */ 33 #include <common.h> 34 #include <command.h> 35 #include <ide.h> 36 #include <malloc.h> 37 #include <part_efi.h> 38 #include <linux/ctype.h> 39 40 #if defined(CONFIG_CMD_IDE) || \ 41 defined(CONFIG_CMD_SATA) || \ 42 defined(CONFIG_CMD_SCSI) || \ 43 defined(CONFIG_CMD_USB) || \ 44 defined(CONFIG_MMC) || \ 45 defined(CONFIG_SYSTEMACE) 46 47 /** 48 * efi_crc32() - EFI version of crc32 function 49 * @buf: buffer to calculate crc32 of 50 * @len - length of buf 51 * 52 * Description: Returns EFI-style CRC32 value for @buf 53 */ 54 static inline u32 efi_crc32(const void *buf, u32 len) 55 { 56 return crc32(0, buf, len); 57 } 58 59 /* 60 * Private function prototypes 61 */ 62 63 static int pmbr_part_valid(struct partition *part); 64 static int is_pmbr_valid(legacy_mbr * mbr); 65 66 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, 67 gpt_header * pgpt_head, gpt_entry ** pgpt_pte); 68 69 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 70 gpt_header * pgpt_head); 71 72 static int is_pte_valid(gpt_entry * pte); 73 74 static char *print_efiname(gpt_entry *pte) 75 { 76 static char name[PARTNAME_SZ + 1]; 77 int i; 78 for (i = 0; i < PARTNAME_SZ; i++) { 79 u8 c; 80 c = pte->partition_name[i] & 0xff; 81 c = (c && !isprint(c)) ? '.' : c; 82 name[i] = c; 83 } 84 name[PARTNAME_SZ] = 0; 85 return name; 86 } 87 88 static void uuid_string(unsigned char *uuid, char *str) 89 { 90 static const u8 le[16] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 91 12, 13, 14, 15}; 92 int i; 93 94 for (i = 0; i < 16; i++) { 95 sprintf(str, "%02x", uuid[le[i]]); 96 str += 2; 97 switch (i) { 98 case 3: 99 case 5: 100 case 7: 101 case 9: 102 *str++ = '-'; 103 break; 104 } 105 } 106 } 107 108 static efi_guid_t system_guid = PARTITION_SYSTEM_GUID; 109 110 static inline int is_bootable(gpt_entry *p) 111 { 112 return p->attributes.fields.legacy_bios_bootable || 113 !memcmp(&(p->partition_type_guid), &system_guid, 114 sizeof(efi_guid_t)); 115 } 116 117 /* 118 * Public Functions (include/part.h) 119 */ 120 121 void print_part_efi(block_dev_desc_t * dev_desc) 122 { 123 ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1); 124 gpt_entry *gpt_pte = NULL; 125 int i = 0; 126 char uuid[37]; 127 128 if (!dev_desc) { 129 printf("%s: Invalid Argument(s)\n", __func__); 130 return; 131 } 132 /* This function validates AND fills in the GPT header and PTE */ 133 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 134 gpt_head, &gpt_pte) != 1) { 135 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 136 return; 137 } 138 139 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 140 141 printf("Part\tStart LBA\tEnd LBA\t\tName\n"); 142 printf("\tAttributes\n"); 143 printf("\tType UUID\n"); 144 printf("\tPartition UUID\n"); 145 146 for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) { 147 /* Stop at the first non valid PTE */ 148 if (!is_pte_valid(&gpt_pte[i])) 149 break; 150 151 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1), 152 le64_to_cpu(gpt_pte[i].starting_lba), 153 le64_to_cpu(gpt_pte[i].ending_lba), 154 print_efiname(&gpt_pte[i])); 155 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw); 156 uuid_string(gpt_pte[i].partition_type_guid.b, uuid); 157 printf("\ttype:\t%s\n", uuid); 158 uuid_string(gpt_pte[i].unique_partition_guid.b, uuid); 159 printf("\tuuid:\t%s\n", uuid); 160 } 161 162 /* Remember to free pte */ 163 free(gpt_pte); 164 return; 165 } 166 167 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, 168 disk_partition_t * info) 169 { 170 ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1); 171 gpt_entry *gpt_pte = NULL; 172 173 /* "part" argument must be at least 1 */ 174 if (!dev_desc || !info || part < 1) { 175 printf("%s: Invalid Argument(s)\n", __func__); 176 return -1; 177 } 178 179 /* This function validates AND fills in the GPT header and PTE */ 180 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 181 gpt_head, &gpt_pte) != 1) { 182 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 183 return -1; 184 } 185 186 if (part > le32_to_cpu(gpt_head->num_partition_entries) || 187 !is_pte_valid(&gpt_pte[part - 1])) { 188 printf("%s: *** ERROR: Invalid partition number %d ***\n", 189 __func__, part); 190 return -1; 191 } 192 193 /* The ulong casting limits the maximum disk size to 2 TB */ 194 info->start = (u64)le64_to_cpu(gpt_pte[part - 1].starting_lba); 195 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 196 info->size = ((u64)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1) 197 - info->start; 198 info->blksz = GPT_BLOCK_SIZE; 199 200 sprintf((char *)info->name, "%s", 201 print_efiname(&gpt_pte[part - 1])); 202 sprintf((char *)info->type, "U-Boot"); 203 info->bootable = is_bootable(&gpt_pte[part - 1]); 204 #ifdef CONFIG_PARTITION_UUIDS 205 uuid_string(gpt_pte[part - 1].unique_partition_guid.b, info->uuid); 206 #endif 207 208 debug("%s: start 0x%lX, size 0x%lX, name %s", __func__, 209 info->start, info->size, info->name); 210 211 /* Remember to free pte */ 212 free(gpt_pte); 213 return 0; 214 } 215 216 int test_part_efi(block_dev_desc_t * dev_desc) 217 { 218 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1); 219 220 /* Read legacy MBR from block 0 and validate it */ 221 if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1) 222 || (is_pmbr_valid(legacymbr) != 1)) { 223 return -1; 224 } 225 return 0; 226 } 227 228 /* 229 * Private functions 230 */ 231 /* 232 * pmbr_part_valid(): Check for EFI partition signature 233 * 234 * Returns: 1 if EFI GPT partition type is found. 235 */ 236 static int pmbr_part_valid(struct partition *part) 237 { 238 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 239 le32_to_cpu(part->start_sect) == 1UL) { 240 return 1; 241 } 242 243 return 0; 244 } 245 246 /* 247 * is_pmbr_valid(): test Protective MBR for validity 248 * 249 * Returns: 1 if PMBR is valid, 0 otherwise. 250 * Validity depends on two things: 251 * 1) MSDOS signature is in the last two bytes of the MBR 252 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 253 */ 254 static int is_pmbr_valid(legacy_mbr * mbr) 255 { 256 int i = 0; 257 258 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) 259 return 0; 260 261 for (i = 0; i < 4; i++) { 262 if (pmbr_part_valid(&mbr->partition_record[i])) { 263 return 1; 264 } 265 } 266 return 0; 267 } 268 269 /** 270 * is_gpt_valid() - tests one GPT header and PTEs for validity 271 * 272 * lba is the logical block address of the GPT header to test 273 * gpt is a GPT header ptr, filled on return. 274 * ptes is a PTEs ptr, filled on return. 275 * 276 * Description: returns 1 if valid, 0 on error. 277 * If valid, returns pointers to PTEs. 278 */ 279 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, 280 gpt_header * pgpt_head, gpt_entry ** pgpt_pte) 281 { 282 u32 crc32_backup = 0; 283 u32 calc_crc32; 284 unsigned long long lastlba; 285 286 if (!dev_desc || !pgpt_head) { 287 printf("%s: Invalid Argument(s)\n", __func__); 288 return 0; 289 } 290 291 /* Read GPT Header from device */ 292 if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) { 293 printf("*** ERROR: Can't read GPT header ***\n"); 294 return 0; 295 } 296 297 /* Check the GPT header signature */ 298 if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { 299 printf("GUID Partition Table Header signature is wrong:" 300 "0x%llX != 0x%llX\n", 301 le64_to_cpu(pgpt_head->signature), 302 GPT_HEADER_SIGNATURE); 303 return 0; 304 } 305 306 /* Check the GUID Partition Table CRC */ 307 memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup)); 308 memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); 309 310 calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, 311 le32_to_cpu(pgpt_head->header_size)); 312 313 memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup)); 314 315 if (calc_crc32 != le32_to_cpu(crc32_backup)) { 316 printf("GUID Partition Table Header CRC is wrong:" 317 "0x%x != 0x%x\n", 318 le32_to_cpu(crc32_backup), calc_crc32); 319 return 0; 320 } 321 322 /* Check that the my_lba entry points to the LBA that contains the GPT */ 323 if (le64_to_cpu(pgpt_head->my_lba) != lba) { 324 printf("GPT: my_lba incorrect: %llX != %llX\n", 325 le64_to_cpu(pgpt_head->my_lba), 326 lba); 327 return 0; 328 } 329 330 /* Check the first_usable_lba and last_usable_lba are within the disk. */ 331 lastlba = (unsigned long long)dev_desc->lba; 332 if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) { 333 printf("GPT: first_usable_lba incorrect: %llX > %llX\n", 334 le64_to_cpu(pgpt_head->first_usable_lba), lastlba); 335 return 0; 336 } 337 if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) { 338 printf("GPT: last_usable_lba incorrect: %llX > %llX\n", 339 (u64) le64_to_cpu(pgpt_head->last_usable_lba), lastlba); 340 return 0; 341 } 342 343 debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", 344 le64_to_cpu(pgpt_head->first_usable_lba), 345 le64_to_cpu(pgpt_head->last_usable_lba), lastlba); 346 347 /* Read and allocate Partition Table Entries */ 348 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 349 if (*pgpt_pte == NULL) { 350 printf("GPT: Failed to allocate memory for PTE\n"); 351 return 0; 352 } 353 354 /* Check the GUID Partition Table Entry Array CRC */ 355 calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, 356 le32_to_cpu(pgpt_head->num_partition_entries) * 357 le32_to_cpu(pgpt_head->sizeof_partition_entry)); 358 359 if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) { 360 printf("GUID Partition Table Entry Array CRC is wrong:" 361 "0x%x != 0x%x\n", 362 le32_to_cpu(pgpt_head->partition_entry_array_crc32), 363 calc_crc32); 364 365 free(*pgpt_pte); 366 return 0; 367 } 368 369 /* We're done, all's well */ 370 return 1; 371 } 372 373 /** 374 * alloc_read_gpt_entries(): reads partition entries from disk 375 * @dev_desc 376 * @gpt - GPT header 377 * 378 * Description: Returns ptes on success, NULL on error. 379 * Allocates space for PTEs based on information found in @gpt. 380 * Notes: remember to free pte when you're done! 381 */ 382 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 383 gpt_header * pgpt_head) 384 { 385 size_t count = 0; 386 gpt_entry *pte = NULL; 387 388 if (!dev_desc || !pgpt_head) { 389 printf("%s: Invalid Argument(s)\n", __func__); 390 return NULL; 391 } 392 393 count = le32_to_cpu(pgpt_head->num_partition_entries) * 394 le32_to_cpu(pgpt_head->sizeof_partition_entry); 395 396 debug("%s: count = %u * %u = %zu\n", __func__, 397 (u32) le32_to_cpu(pgpt_head->num_partition_entries), 398 (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), count); 399 400 /* Allocate memory for PTE, remember to FREE */ 401 if (count != 0) { 402 pte = memalign(ARCH_DMA_MINALIGN, count); 403 } 404 405 if (count == 0 || pte == NULL) { 406 printf("%s: ERROR: Can't allocate 0x%zX " 407 "bytes for GPT Entries\n", 408 __func__, count); 409 return NULL; 410 } 411 412 /* Read GPT Entries from device */ 413 if (dev_desc->block_read (dev_desc->dev, 414 le64_to_cpu(pgpt_head->partition_entry_lba), 415 (lbaint_t) (count / GPT_BLOCK_SIZE), pte) 416 != (count / GPT_BLOCK_SIZE)) { 417 418 printf("*** ERROR: Can't read GPT Entries ***\n"); 419 free(pte); 420 return NULL; 421 } 422 return pte; 423 } 424 425 /** 426 * is_pte_valid(): validates a single Partition Table Entry 427 * @gpt_entry - Pointer to a single Partition Table Entry 428 * 429 * Description: returns 1 if valid, 0 on error. 430 */ 431 static int is_pte_valid(gpt_entry * pte) 432 { 433 efi_guid_t unused_guid; 434 435 if (!pte) { 436 printf("%s: Invalid Argument(s)\n", __func__); 437 return 0; 438 } 439 440 /* Only one validation for now: 441 * The GUID Partition Type != Unused Entry (ALL-ZERO) 442 */ 443 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 444 445 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 446 sizeof(unused_guid.b)) == 0) { 447 448 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 449 (unsigned int)(uintptr_t)pte); 450 451 return 0; 452 } else { 453 return 1; 454 } 455 } 456 #endif 457