disk/part_efi.c

   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
  39 #if defined(CONFIG_CMD_IDE) || \
  40     defined(CONFIG_CMD_MG_DISK) || \
  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 /* Convert char[2] in little endian format to the host format integer
  48  */
  49 static inline unsigned short le16_to_int(unsigned char *le16)
  50 {
  51         return ((le16[1] << 8) + le16[0]);
  52 }
  53
  54 /* Convert char[4] in little endian format to the host format integer
  55  */
  56 static inline unsigned long le32_to_int(unsigned char *le32)
  57 {
  58         return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]);
  59 }
  60
  61 /* Convert char[8] in little endian format to the host format integer
  62  */
  63 static inline unsigned long long le64_to_int(unsigned char *le64)
  64 {
  65         return (((unsigned long long)le64[7] << 56) +
  66                 ((unsigned long long)le64[6] << 48) +
  67                 ((unsigned long long)le64[5] << 40) +
  68                 ((unsigned long long)le64[4] << 32) +
  69                 ((unsigned long long)le64[3] << 24) +
  70                 ((unsigned long long)le64[2] << 16) +
  71                 ((unsigned long long)le64[1] << 8) +
  72                 (unsigned long long)le64[0]);
  73 }
  74
  75 /**
  76  * efi_crc32() - EFI version of crc32 function
  77  * @buf: buffer to calculate crc32 of
  78  * @len - length of buf
  79  *
  80  * Description: Returns EFI-style CRC32 value for @buf
  81  */
  82 static inline unsigned long efi_crc32(const void *buf, unsigned long len)
  83 {
  84         return crc32(0, buf, len);
  85 }
  86
  87 /*
  88  * Private function prototypes
  89  */
  90
  91 static int pmbr_part_valid(struct partition *part);
  92 static int is_pmbr_valid(legacy_mbr * mbr);
  93
  94 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
  95                                 gpt_header * pgpt_head, gpt_entry ** pgpt_pte);
  96
  97 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
  98                                 gpt_header * pgpt_head);
  99
 100 static int is_pte_valid(gpt_entry * pte);
 101
 102 /*
 103  * Public Functions (include/part.h)
 104  */
 105
 106 void print_part_efi(block_dev_desc_t * dev_desc)
 107 {
 108         gpt_header gpt_head;
 109         gpt_entry **pgpt_pte = NULL;
 110         int i = 0;
 111
 112         if (!dev_desc) {
 113                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 114                 return;
 115         }
 116         /* This function validates AND fills in the GPT header and PTE */
 117         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 118                          &(gpt_head), pgpt_pte) != 1) {
 119                 printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
 120                 return;
 121         }
 122
 123         debug("%s: gpt-entry at 0x%08X\n", __FUNCTION__, (unsigned int)*pgpt_pte);
 124
 125         printf("Part  Start LBA  End LBA\n");
 126         for (i = 0; i < le32_to_int(gpt_head.num_partition_entries); i++) {
 127
 128                 if (is_pte_valid(&(*pgpt_pte)[i])) {
 129                         printf("%s%d  0x%llX    0x%llX\n", GPT_ENTRY_NAME,
 130                                 (i + 1),
 131                                 le64_to_int((*pgpt_pte)[i].starting_lba),
 132                                 le64_to_int((*pgpt_pte)[i].ending_lba));
 133                 } else {
 134                         break;  /* Stop at the first non valid PTE */
 135                 }
 136         }
 137
 138         /* Remember to free pte */
 139         if (*pgpt_pte != NULL) {
 140                 debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
 141                 free(*pgpt_pte);
 142         }
 143         return;
 144 }
 145
 146 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 147                                 disk_partition_t * info)
 148 {
 149         gpt_header gpt_head;
 150         gpt_entry **pgpt_pte = NULL;
 151
 152         /* "part" argument must be at least 1 */
 153         if (!dev_desc || !info || part < 1) {
 154                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 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,
 160                         &(gpt_head), pgpt_pte) != 1) {
 161                 printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
 162                 return -1;
 163         }
 164
 165         /* The ulong casting limits the maximum disk size to 2 TB */
 166         info->start = (ulong) le64_to_int((*pgpt_pte)[part - 1].starting_lba);
 167         /* The ending LBA is inclusive, to calculate size, add 1 to it */
 168         info->size = ((ulong)le64_to_int((*pgpt_pte)[part - 1].ending_lba) + 1)
 169                      - info->start;
 170         info->blksz = GPT_BLOCK_SIZE;
 171
 172         sprintf((char *)info->name, "%s%d", GPT_ENTRY_NAME, part);
 173         sprintf((char *)info->type, "U-Boot");
 174
 175         debug("%s: start 0x%lX, size 0x%lX, name %s", __FUNCTION__,
 176                 info->start, info->size, info->name);
 177
 178         /* Remember to free pte */
 179         if (*pgpt_pte != NULL) {
 180                 debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
 181                 free(*pgpt_pte);
 182         }
 183         return 0;
 184 }
 185
 186 int test_part_efi(block_dev_desc_t * dev_desc)
 187 {
 188         legacy_mbr legacymbr;
 189
 190         /* Read legacy MBR from block 0 and validate it */
 191         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) & legacymbr) != 1)
 192                 || (is_pmbr_valid(&legacymbr) != 1)) {
 193                 return -1;
 194         }
 195         return 0;
 196 }
 197
 198 /*
 199  * Private functions
 200  */
 201 /*
 202  * pmbr_part_valid(): Check for EFI partition signature
 203  *
 204  * Returns: 1 if EFI GPT partition type is found.
 205  */
 206 static int pmbr_part_valid(struct partition *part)
 207 {
 208         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 209                 le32_to_int(part->start_sect) == 1UL) {
 210                 return 1;
 211         }
 212
 213         return 0;
 214 }
 215
 216 /*
 217  * is_pmbr_valid(): test Protective MBR for validity
 218  *
 219  * Returns: 1 if PMBR is valid, 0 otherwise.
 220  * Validity depends on two things:
 221  *  1) MSDOS signature is in the last two bytes of the MBR
 222  *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 223  */
 224 static int is_pmbr_valid(legacy_mbr * mbr)
 225 {
 226         int i = 0;
 227
 228         if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
 229                 return 0;
 230         }
 231
 232         for (i = 0; i < 4; i++) {
 233                 if (pmbr_part_valid(&mbr->partition_record[i])) {
 234                         return 1;
 235                 }
 236         }
 237         return 0;
 238 }
 239
 240 /**
 241  * is_gpt_valid() - tests one GPT header and PTEs for validity
 242  *
 243  * lba is the logical block address of the GPT header to test
 244  * gpt is a GPT header ptr, filled on return.
 245  * ptes is a PTEs ptr, filled on return.
 246  *
 247  * Description: returns 1 if valid,  0 on error.
 248  * If valid, returns pointers to PTEs.
 249  */
 250 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 251                         gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
 252 {
 253         unsigned char crc32_backup[4] = { 0 };
 254         unsigned long calc_crc32;
 255         unsigned long long lastlba;
 256
 257         if (!dev_desc || !pgpt_head) {
 258                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 259                 return 0;
 260         }
 261
 262         /* Read GPT Header from device */
 263         if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
 264                 printf("*** ERROR: Can't read GPT header ***\n");
 265                 return 0;
 266         }
 267
 268         /* Check the GPT header signature */
 269         if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
 270                 printf("GUID Partition Table Header signature is wrong:"
 271                         "0x%llX != 0x%llX\n",
 272                         (unsigned long long)le64_to_int(pgpt_head->signature),
 273                         (unsigned long long)GPT_HEADER_SIGNATURE);
 274                 return 0;
 275         }
 276
 277         /* Check the GUID Partition Table CRC */
 278         memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
 279         memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
 280
 281         calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
 282                 le32_to_int(pgpt_head->header_size));
 283
 284         memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
 285
 286         if (calc_crc32 != le32_to_int(crc32_backup)) {
 287                 printf("GUID Partition Table Header CRC is wrong:"
 288                         "0x%08lX != 0x%08lX\n",
 289                         le32_to_int(crc32_backup), calc_crc32);
 290                 return 0;
 291         }
 292
 293         /* Check that the my_lba entry points to the LBA that contains the GPT */
 294         if (le64_to_int(pgpt_head->my_lba) != lba) {
 295                 printf("GPT: my_lba incorrect: %llX != %llX\n",
 296                         (unsigned long long)le64_to_int(pgpt_head->my_lba),
 297                         (unsigned long long)lba);
 298                 return 0;
 299         }
 300
 301         /* Check the first_usable_lba and last_usable_lba are within the disk. */
 302         lastlba = (unsigned long long)dev_desc->lba;
 303         if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
 304                 printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
 305                         le64_to_int(pgpt_head->first_usable_lba), lastlba);
 306                 return 0;
 307         }
 308         if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
 309                 printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
 310                         le64_to_int(pgpt_head->last_usable_lba), lastlba);
 311                 return 0;
 312         }
 313
 314         debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
 315                 le64_to_int(pgpt_head->first_usable_lba),
 316                 le64_to_int(pgpt_head->last_usable_lba), lastlba);
 317
 318         /* Read and allocate Partition Table Entries */
 319         *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
 320         if (*pgpt_pte == NULL) {
 321                 printf("GPT: Failed to allocate memory for PTE\n");
 322                 return 0;
 323         }
 324
 325         /* Check the GUID Partition Table Entry Array CRC */
 326         calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
 327                 le32_to_int(pgpt_head->num_partition_entries) *
 328                 le32_to_int(pgpt_head->sizeof_partition_entry));
 329
 330         if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
 331                 printf("GUID Partition Table Entry Array CRC is wrong:"
 332                         "0x%08lX != 0x%08lX\n",
 333                         le32_to_int(pgpt_head->partition_entry_array_crc32),
 334                         calc_crc32);
 335
 336                 if (*pgpt_pte != NULL) {
 337                         free(*pgpt_pte);
 338                 }
 339                 return 0;
 340         }
 341
 342         /* We're done, all's well */
 343         return 1;
 344 }
 345
 346 /**
 347  * alloc_read_gpt_entries(): reads partition entries from disk
 348  * @dev_desc
 349  * @gpt - GPT header
 350  *
 351  * Description: Returns ptes on success,  NULL on error.
 352  * Allocates space for PTEs based on information found in @gpt.
 353  * Notes: remember to free pte when you're done!
 354  */
 355 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 356                                          gpt_header * pgpt_head)
 357 {
 358         size_t count = 0;
 359         gpt_entry *pte = NULL;
 360
 361         if (!dev_desc || !pgpt_head) {
 362                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 363                 return NULL;
 364         }
 365
 366         count = le32_to_int(pgpt_head->num_partition_entries) *
 367                 le32_to_int(pgpt_head->sizeof_partition_entry);
 368
 369         debug("%s: count = %lu * %lu = %u\n", __FUNCTION__,
 370                 le32_to_int(pgpt_head->num_partition_entries),
 371                 le32_to_int(pgpt_head->sizeof_partition_entry), count);
 372
 373         /* Allocate memory for PTE, remember to FREE */
 374         if (count != 0) {
 375                 pte = malloc(count);
 376         }
 377
 378         if (count == 0 || pte == NULL) {
 379                 printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
 380                         __FUNCTION__, count);
 381                 return NULL;
 382         }
 383
 384         /* Read GPT Entries from device */
 385         if (dev_desc->block_read (dev_desc->dev,
 386                 (unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
 387                 (lbaint_t) (count / GPT_BLOCK_SIZE), pte)
 388                 != (count / GPT_BLOCK_SIZE)) {
 389
 390                 printf("*** ERROR: Can't read GPT Entries ***\n");
 391                 free(pte);
 392                 return NULL;
 393         }
 394         return pte;
 395 }
 396
 397 /**
 398  * is_pte_valid(): validates a single Partition Table Entry
 399  * @gpt_entry - Pointer to a single Partition Table Entry
 400  *
 401  * Description: returns 1 if valid,  0 on error.
 402  */
 403 static int is_pte_valid(gpt_entry * pte)
 404 {
 405         efi_guid_t unused_guid;
 406
 407         if (!pte) {
 408                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 409                 return 0;
 410         }
 411
 412         /* Only one validation for now:
 413          * The GUID Partition Type != Unused Entry (ALL-ZERO)
 414          */
 415         memset(unused_guid.b, 0, sizeof(unused_guid.b));
 416
 417         if (memcmp(pte->partition_type_guid.b, unused_guid.b,
 418                 sizeof(unused_guid.b)) == 0) {
 419
 420                 debug("%s: Found an unused PTE GUID at 0x%08X\n", __FUNCTION__,
 421                 (unsigned int)pte);
 422
 423                 return 0;
 424         } else {
 425                 return 1;
 426         }
 427 }
 428 #endif