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_MG_DISK) || \ 42 defined(CONFIG_CMD_SATA) || \ 43 defined(CONFIG_CMD_SCSI) || \ 44 defined(CONFIG_CMD_USB) || \ 45 defined(CONFIG_MMC) || \ 46 defined(CONFIG_SYSTEMACE) 47 48 /* Convert char[2] in little endian format to the host format integer 49 */ 50 static inline unsigned short le16_to_int(unsigned char *le16) 51 { 52 return ((le16[1] << 8) + le16[0]); 53 } 54 55 /* Convert char[4] in little endian format to the host format integer 56 */ 57 static inline unsigned long le32_to_int(unsigned char *le32) 58 { 59 return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]); 60 } 61 62 /* Convert char[8] in little endian format to the host format integer 63 */ 64 static inline unsigned long long le64_to_int(unsigned char *le64) 65 { 66 return (((unsigned long long)le64[7] << 56) + 67 ((unsigned long long)le64[6] << 48) + 68 ((unsigned long long)le64[5] << 40) + 69 ((unsigned long long)le64[4] << 32) + 70 ((unsigned long long)le64[3] << 24) + 71 ((unsigned long long)le64[2] << 16) + 72 ((unsigned long long)le64[1] << 8) + 73 (unsigned long long)le64[0]); 74 } 75 76 /** 77 * efi_crc32() - EFI version of crc32 function 78 * @buf: buffer to calculate crc32 of 79 * @len - length of buf 80 * 81 * Description: Returns EFI-style CRC32 value for @buf 82 */ 83 static inline unsigned long efi_crc32(const void *buf, unsigned long len) 84 { 85 return crc32(0, buf, len); 86 } 87 88 /* 89 * Private function prototypes 90 */ 91 92 static int pmbr_part_valid(struct partition *part); 93 static int is_pmbr_valid(legacy_mbr * mbr); 94 95 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, 96 gpt_header * pgpt_head, gpt_entry ** pgpt_pte); 97 98 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 99 gpt_header * pgpt_head); 100 101 static int is_pte_valid(gpt_entry * pte); 102 103 static char *print_efiname(gpt_entry *pte) 104 { 105 static char name[PARTNAME_SZ + 1]; 106 int i; 107 for (i = 0; i < PARTNAME_SZ; i++) { 108 u8 c; 109 c = pte->partition_name[i] & 0xff; 110 c = (c && !isprint(c)) ? '.' : c; 111 name[i] = c; 112 } 113 name[PARTNAME_SZ] = 0; 114 return name; 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; 126 127 if (!dev_desc) { 128 printf("%s: Invalid Argument(s)\n", __func__); 129 return; 130 } 131 /* This function validates AND fills in the GPT header and PTE */ 132 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 133 gpt_head, &gpt_pte) != 1) { 134 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 135 return; 136 } 137 138 debug("%s: gpt-entry at %p\n", __func__, gpt_pte); 139 140 printf("Part\tName\t\t\tStart LBA\tEnd LBA\n"); 141 for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) { 142 143 if (is_pte_valid(&gpt_pte[i])) { 144 printf("%3d\t%-18s\t0x%08llX\t0x%08llX\n", (i + 1), 145 print_efiname(&gpt_pte[i]), 146 le64_to_int(gpt_pte[i].starting_lba), 147 le64_to_int(gpt_pte[i].ending_lba)); 148 } else { 149 break; /* Stop at the first non valid PTE */ 150 } 151 } 152 153 /* Remember to free pte */ 154 free(gpt_pte); 155 return; 156 } 157 158 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part, 159 disk_partition_t * info) 160 { 161 ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1); 162 gpt_entry *gpt_pte = NULL; 163 164 /* "part" argument must be at least 1 */ 165 if (!dev_desc || !info || part < 1) { 166 printf("%s: Invalid Argument(s)\n", __func__); 167 return -1; 168 } 169 170 /* This function validates AND fills in the GPT header and PTE */ 171 if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, 172 gpt_head, &gpt_pte) != 1) { 173 printf("%s: *** ERROR: Invalid GPT ***\n", __func__); 174 return -1; 175 } 176 177 /* The ulong casting limits the maximum disk size to 2 TB */ 178 info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba); 179 /* The ending LBA is inclusive, to calculate size, add 1 to it */ 180 info->size = ((ulong)le64_to_int(gpt_pte[part - 1].ending_lba) + 1) 181 - info->start; 182 info->blksz = GPT_BLOCK_SIZE; 183 184 sprintf((char *)info->name, "%s", 185 print_efiname(&gpt_pte[part - 1])); 186 sprintf((char *)info->type, "U-Boot"); 187 188 debug("%s: start 0x%lX, size 0x%lX, 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(legacy_mbr, legacymbr, 1); 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 * Private functions 210 */ 211 /* 212 * pmbr_part_valid(): Check for EFI partition signature 213 * 214 * Returns: 1 if EFI GPT partition type is found. 215 */ 216 static int pmbr_part_valid(struct partition *part) 217 { 218 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && 219 le32_to_int(part->start_sect) == 1UL) { 220 return 1; 221 } 222 223 return 0; 224 } 225 226 /* 227 * is_pmbr_valid(): test Protective MBR for validity 228 * 229 * Returns: 1 if PMBR is valid, 0 otherwise. 230 * Validity depends on two things: 231 * 1) MSDOS signature is in the last two bytes of the MBR 232 * 2) One partition of type 0xEE is found, checked by pmbr_part_valid() 233 */ 234 static int is_pmbr_valid(legacy_mbr * mbr) 235 { 236 int i = 0; 237 238 if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) { 239 return 0; 240 } 241 242 for (i = 0; i < 4; i++) { 243 if (pmbr_part_valid(&mbr->partition_record[i])) { 244 return 1; 245 } 246 } 247 return 0; 248 } 249 250 /** 251 * is_gpt_valid() - tests one GPT header and PTEs for validity 252 * 253 * lba is the logical block address of the GPT header to test 254 * gpt is a GPT header ptr, filled on return. 255 * ptes is a PTEs ptr, filled on return. 256 * 257 * Description: returns 1 if valid, 0 on error. 258 * If valid, returns pointers to PTEs. 259 */ 260 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba, 261 gpt_header * pgpt_head, gpt_entry ** pgpt_pte) 262 { 263 unsigned char crc32_backup[4] = { 0 }; 264 unsigned long calc_crc32; 265 unsigned long long lastlba; 266 267 if (!dev_desc || !pgpt_head) { 268 printf("%s: Invalid Argument(s)\n", __func__); 269 return 0; 270 } 271 272 /* Read GPT Header from device */ 273 if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) { 274 printf("*** ERROR: Can't read GPT header ***\n"); 275 return 0; 276 } 277 278 /* Check the GPT header signature */ 279 if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) { 280 printf("GUID Partition Table Header signature is wrong:" 281 "0x%llX != 0x%llX\n", 282 (unsigned long long)le64_to_int(pgpt_head->signature), 283 (unsigned long long)GPT_HEADER_SIGNATURE); 284 return 0; 285 } 286 287 /* Check the GUID Partition Table CRC */ 288 memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup)); 289 memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32)); 290 291 calc_crc32 = efi_crc32((const unsigned char *)pgpt_head, 292 le32_to_int(pgpt_head->header_size)); 293 294 memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup)); 295 296 if (calc_crc32 != le32_to_int(crc32_backup)) { 297 printf("GUID Partition Table Header CRC is wrong:" 298 "0x%08lX != 0x%08lX\n", 299 le32_to_int(crc32_backup), calc_crc32); 300 return 0; 301 } 302 303 /* Check that the my_lba entry points to the LBA that contains the GPT */ 304 if (le64_to_int(pgpt_head->my_lba) != lba) { 305 printf("GPT: my_lba incorrect: %llX != %llX\n", 306 (unsigned long long)le64_to_int(pgpt_head->my_lba), 307 (unsigned long long)lba); 308 return 0; 309 } 310 311 /* Check the first_usable_lba and last_usable_lba are within the disk. */ 312 lastlba = (unsigned long long)dev_desc->lba; 313 if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) { 314 printf("GPT: first_usable_lba incorrect: %llX > %llX\n", 315 le64_to_int(pgpt_head->first_usable_lba), lastlba); 316 return 0; 317 } 318 if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) { 319 printf("GPT: last_usable_lba incorrect: %llX > %llX\n", 320 le64_to_int(pgpt_head->last_usable_lba), lastlba); 321 return 0; 322 } 323 324 debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n", 325 le64_to_int(pgpt_head->first_usable_lba), 326 le64_to_int(pgpt_head->last_usable_lba), lastlba); 327 328 /* Read and allocate Partition Table Entries */ 329 *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head); 330 if (*pgpt_pte == NULL) { 331 printf("GPT: Failed to allocate memory for PTE\n"); 332 return 0; 333 } 334 335 /* Check the GUID Partition Table Entry Array CRC */ 336 calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte, 337 le32_to_int(pgpt_head->num_partition_entries) * 338 le32_to_int(pgpt_head->sizeof_partition_entry)); 339 340 if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) { 341 printf("GUID Partition Table Entry Array CRC is wrong:" 342 "0x%08lX != 0x%08lX\n", 343 le32_to_int(pgpt_head->partition_entry_array_crc32), 344 calc_crc32); 345 346 free(*pgpt_pte); 347 return 0; 348 } 349 350 /* We're done, all's well */ 351 return 1; 352 } 353 354 /** 355 * alloc_read_gpt_entries(): reads partition entries from disk 356 * @dev_desc 357 * @gpt - GPT header 358 * 359 * Description: Returns ptes on success, NULL on error. 360 * Allocates space for PTEs based on information found in @gpt. 361 * Notes: remember to free pte when you're done! 362 */ 363 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc, 364 gpt_header * pgpt_head) 365 { 366 size_t count = 0; 367 gpt_entry *pte = NULL; 368 369 if (!dev_desc || !pgpt_head) { 370 printf("%s: Invalid Argument(s)\n", __func__); 371 return NULL; 372 } 373 374 count = le32_to_int(pgpt_head->num_partition_entries) * 375 le32_to_int(pgpt_head->sizeof_partition_entry); 376 377 debug("%s: count = %lu * %lu = %u\n", __func__, 378 le32_to_int(pgpt_head->num_partition_entries), 379 le32_to_int(pgpt_head->sizeof_partition_entry), count); 380 381 /* Allocate memory for PTE, remember to FREE */ 382 if (count != 0) { 383 pte = memalign(ARCH_DMA_MINALIGN, count); 384 } 385 386 if (count == 0 || pte == NULL) { 387 printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n", 388 __func__, count); 389 return NULL; 390 } 391 392 /* Read GPT Entries from device */ 393 if (dev_desc->block_read (dev_desc->dev, 394 (unsigned long)le64_to_int(pgpt_head->partition_entry_lba), 395 (lbaint_t) (count / GPT_BLOCK_SIZE), pte) 396 != (count / GPT_BLOCK_SIZE)) { 397 398 printf("*** ERROR: Can't read GPT Entries ***\n"); 399 free(pte); 400 return NULL; 401 } 402 return pte; 403 } 404 405 /** 406 * is_pte_valid(): validates a single Partition Table Entry 407 * @gpt_entry - Pointer to a single Partition Table Entry 408 * 409 * Description: returns 1 if valid, 0 on error. 410 */ 411 static int is_pte_valid(gpt_entry * pte) 412 { 413 efi_guid_t unused_guid; 414 415 if (!pte) { 416 printf("%s: Invalid Argument(s)\n", __func__); 417 return 0; 418 } 419 420 /* Only one validation for now: 421 * The GUID Partition Type != Unused Entry (ALL-ZERO) 422 */ 423 memset(unused_guid.b, 0, sizeof(unused_guid.b)); 424 425 if (memcmp(pte->partition_type_guid.b, unused_guid.b, 426 sizeof(unused_guid.b)) == 0) { 427 428 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__, 429 (unsigned int)pte); 430 431 return 0; 432 } else { 433 return 1; 434 } 435 } 436 #endif 437