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 #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 /* 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 static char *print_efiname(gpt_entry *pte)
 103 {
 104         static char name[PARTNAME_SZ + 1];
 105         int i;
 106         for (i = 0; i < PARTNAME_SZ; i++) {
 107                 u8 c;
 108                 c = pte->partition_name[i] & 0xff;
 109                 c = (c && !isprint(c)) ? '.' : c;
 110                 name[i] = c;
 111         }
 112         name[PARTNAME_SZ] = 0;
 113         return name;
 114 }
 115
 116 static void uuid_string(unsigned char *uuid, char *str)
 117 {
 118         static const u8 le[16] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11,
 119                                   12, 13, 14, 15};
 120         int i;
 121
 122         for (i = 0; i < 16; i++) {
 123                 sprintf(str, "%02x", uuid[le[i]]);
 124                 str += 2;
 125                 switch (i) {
 126                 case 3:
 127                 case 5:
 128                 case 7:
 129                 case 9:
 130                         *str++ = '-';
 131                         break;
 132                 }
 133         }
 134 }
 135
 136 /*
 137  * Public Functions (include/part.h)
 138  */
 139
 140 void print_part_efi(block_dev_desc_t * dev_desc)
 141 {
 142         ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
 143         gpt_entry *gpt_pte = NULL;
 144         int i = 0;
 145         char uuid[37];
 146
 147         if (!dev_desc) {
 148                 printf("%s: Invalid Argument(s)\n", __func__);
 149                 return;
 150         }
 151         /* This function validates AND fills in the GPT header and PTE */
 152         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 153                          gpt_head, &gpt_pte) != 1) {
 154                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 155                 return;
 156         }
 157
 158         debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
 159
 160         printf("Part\tStart LBA\tEnd LBA\t\tName\n");
 161         printf("\tAttributes\n");
 162         printf("\tType UUID\n");
 163         printf("\tPartition UUID\n");
 164
 165         for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {
 166                 /* Stop at the first non valid PTE */
 167                 if (!is_pte_valid(&gpt_pte[i]))
 168                         break;
 169
 170                 printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
 171                         le64_to_int(gpt_pte[i].starting_lba),
 172                         le64_to_int(gpt_pte[i].ending_lba),
 173                         print_efiname(&gpt_pte[i]));
 174                 printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
 175                 uuid_string(gpt_pte[i].partition_type_guid.b, uuid);
 176                 printf("\ttype:\t%s\n", uuid);
 177                 uuid_string(gpt_pte[i].unique_partition_guid.b, uuid);
 178                 printf("\tuuid:\t%s\n", uuid);
 179         }
 180
 181         /* Remember to free pte */
 182         free(gpt_pte);
 183         return;
 184 }
 185
 186 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 187                                 disk_partition_t * info)
 188 {
 189         ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
 190         gpt_entry *gpt_pte = NULL;
 191
 192         /* "part" argument must be at least 1 */
 193         if (!dev_desc || !info || part < 1) {
 194                 printf("%s: Invalid Argument(s)\n", __func__);
 195                 return -1;
 196         }
 197
 198         /* This function validates AND fills in the GPT header and PTE */
 199         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 200                         gpt_head, &gpt_pte) != 1) {
 201                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 202                 return -1;
 203         }
 204
 205         if (part > le32_to_int(gpt_head->num_partition_entries) ||
 206             !is_pte_valid(&gpt_pte[part - 1])) {
 207                 printf("%s: *** ERROR: Invalid partition number %d ***\n",
 208                         __func__, part);
 209                 return -1;
 210         }
 211
 212         /* The ulong casting limits the maximum disk size to 2 TB */
 213         info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
 214         /* The ending LBA is inclusive, to calculate size, add 1 to it */
 215         info->size = ((ulong)le64_to_int(gpt_pte[part - 1].ending_lba) + 1)
 216                      - info->start;
 217         info->blksz = GPT_BLOCK_SIZE;
 218
 219         sprintf((char *)info->name, "%s",
 220                         print_efiname(&gpt_pte[part - 1]));
 221         sprintf((char *)info->type, "U-Boot");
 222 #ifdef CONFIG_PARTITION_UUIDS
 223         uuid_string(gpt_pte[part - 1].unique_partition_guid.b, info->uuid);
 224 #endif
 225
 226         debug("%s: start 0x%lX, size 0x%lX, name %s", __func__,
 227                 info->start, info->size, info->name);
 228
 229         /* Remember to free pte */
 230         free(gpt_pte);
 231         return 0;
 232 }
 233
 234 int test_part_efi(block_dev_desc_t * dev_desc)
 235 {
 236         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1);
 237
 238         /* Read legacy MBR from block 0 and validate it */
 239         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
 240                 || (is_pmbr_valid(legacymbr) != 1)) {
 241                 return -1;
 242         }
 243         return 0;
 244 }
 245
 246 /*
 247  * Private functions
 248  */
 249 /*
 250  * pmbr_part_valid(): Check for EFI partition signature
 251  *
 252  * Returns: 1 if EFI GPT partition type is found.
 253  */
 254 static int pmbr_part_valid(struct partition *part)
 255 {
 256         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 257                 le32_to_int(part->start_sect) == 1UL) {
 258                 return 1;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /*
 265  * is_pmbr_valid(): test Protective MBR for validity
 266  *
 267  * Returns: 1 if PMBR is valid, 0 otherwise.
 268  * Validity depends on two things:
 269  *  1) MSDOS signature is in the last two bytes of the MBR
 270  *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 271  */
 272 static int is_pmbr_valid(legacy_mbr * mbr)
 273 {
 274         int i = 0;
 275
 276         if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
 277                 return 0;
 278         }
 279
 280         for (i = 0; i < 4; i++) {
 281                 if (pmbr_part_valid(&mbr->partition_record[i])) {
 282                         return 1;
 283                 }
 284         }
 285         return 0;
 286 }
 287
 288 /**
 289  * is_gpt_valid() - tests one GPT header and PTEs for validity
 290  *
 291  * lba is the logical block address of the GPT header to test
 292  * gpt is a GPT header ptr, filled on return.
 293  * ptes is a PTEs ptr, filled on return.
 294  *
 295  * Description: returns 1 if valid,  0 on error.
 296  * If valid, returns pointers to PTEs.
 297  */
 298 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 299                         gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
 300 {
 301         unsigned char crc32_backup[4] = { 0 };
 302         unsigned long calc_crc32;
 303         unsigned long long lastlba;
 304
 305         if (!dev_desc || !pgpt_head) {
 306                 printf("%s: Invalid Argument(s)\n", __func__);
 307                 return 0;
 308         }
 309
 310         /* Read GPT Header from device */
 311         if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
 312                 printf("*** ERROR: Can't read GPT header ***\n");
 313                 return 0;
 314         }
 315
 316         /* Check the GPT header signature */
 317         if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
 318                 printf("GUID Partition Table Header signature is wrong:"
 319                         "0x%llX != 0x%llX\n",
 320                         (unsigned long long)le64_to_int(pgpt_head->signature),
 321                         (unsigned long long)GPT_HEADER_SIGNATURE);
 322                 return 0;
 323         }
 324
 325         /* Check the GUID Partition Table CRC */
 326         memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
 327         memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
 328
 329         calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
 330                 le32_to_int(pgpt_head->header_size));
 331
 332         memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
 333
 334         if (calc_crc32 != le32_to_int(crc32_backup)) {
 335                 printf("GUID Partition Table Header CRC is wrong:"
 336                         "0x%08lX != 0x%08lX\n",
 337                         le32_to_int(crc32_backup), calc_crc32);
 338                 return 0;
 339         }
 340
 341         /* Check that the my_lba entry points to the LBA that contains the GPT */
 342         if (le64_to_int(pgpt_head->my_lba) != lba) {
 343                 printf("GPT: my_lba incorrect: %llX != %llX\n",
 344                         (unsigned long long)le64_to_int(pgpt_head->my_lba),
 345                         (unsigned long long)lba);
 346                 return 0;
 347         }
 348
 349         /* Check the first_usable_lba and last_usable_lba are within the disk. */
 350         lastlba = (unsigned long long)dev_desc->lba;
 351         if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
 352                 printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
 353                         le64_to_int(pgpt_head->first_usable_lba), lastlba);
 354                 return 0;
 355         }
 356         if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
 357                 printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
 358                         le64_to_int(pgpt_head->last_usable_lba), lastlba);
 359                 return 0;
 360         }
 361
 362         debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
 363                 le64_to_int(pgpt_head->first_usable_lba),
 364                 le64_to_int(pgpt_head->last_usable_lba), lastlba);
 365
 366         /* Read and allocate Partition Table Entries */
 367         *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
 368         if (*pgpt_pte == NULL) {
 369                 printf("GPT: Failed to allocate memory for PTE\n");
 370                 return 0;
 371         }
 372
 373         /* Check the GUID Partition Table Entry Array CRC */
 374         calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
 375                 le32_to_int(pgpt_head->num_partition_entries) *
 376                 le32_to_int(pgpt_head->sizeof_partition_entry));
 377
 378         if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
 379                 printf("GUID Partition Table Entry Array CRC is wrong:"
 380                         "0x%08lX != 0x%08lX\n",
 381                         le32_to_int(pgpt_head->partition_entry_array_crc32),
 382                         calc_crc32);
 383
 384                 free(*pgpt_pte);
 385                 return 0;
 386         }
 387
 388         /* We're done, all's well */
 389         return 1;
 390 }
 391
 392 /**
 393  * alloc_read_gpt_entries(): reads partition entries from disk
 394  * @dev_desc
 395  * @gpt - GPT header
 396  *
 397  * Description: Returns ptes on success,  NULL on error.
 398  * Allocates space for PTEs based on information found in @gpt.
 399  * Notes: remember to free pte when you're done!
 400  */
 401 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 402                                          gpt_header * pgpt_head)
 403 {
 404         size_t count = 0;
 405         gpt_entry *pte = NULL;
 406
 407         if (!dev_desc || !pgpt_head) {
 408                 printf("%s: Invalid Argument(s)\n", __func__);
 409                 return NULL;
 410         }
 411
 412         count = le32_to_int(pgpt_head->num_partition_entries) *
 413                 le32_to_int(pgpt_head->sizeof_partition_entry);
 414
 415         debug("%s: count = %lu * %lu = %u\n", __func__,
 416                 le32_to_int(pgpt_head->num_partition_entries),
 417                 le32_to_int(pgpt_head->sizeof_partition_entry), count);
 418
 419         /* Allocate memory for PTE, remember to FREE */
 420         if (count != 0) {
 421                 pte = memalign(ARCH_DMA_MINALIGN, count);
 422         }
 423
 424         if (count == 0 || pte == NULL) {
 425                 printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
 426                         __func__, count);
 427                 return NULL;
 428         }
 429
 430         /* Read GPT Entries from device */
 431         if (dev_desc->block_read (dev_desc->dev,
 432                 (unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
 433                 (lbaint_t) (count / GPT_BLOCK_SIZE), pte)
 434                 != (count / GPT_BLOCK_SIZE)) {
 435
 436                 printf("*** ERROR: Can't read GPT Entries ***\n");
 437                 free(pte);
 438                 return NULL;
 439         }
 440         return pte;
 441 }
 442
 443 /**
 444  * is_pte_valid(): validates a single Partition Table Entry
 445  * @gpt_entry - Pointer to a single Partition Table Entry
 446  *
 447  * Description: returns 1 if valid,  0 on error.
 448  */
 449 static int is_pte_valid(gpt_entry * pte)
 450 {
 451         efi_guid_t unused_guid;
 452
 453         if (!pte) {
 454                 printf("%s: Invalid Argument(s)\n", __func__);
 455                 return 0;
 456         }
 457
 458         /* Only one validation for now:
 459          * The GUID Partition Type != Unused Entry (ALL-ZERO)
 460          */
 461         memset(unused_guid.b, 0, sizeof(unused_guid.b));
 462
 463         if (memcmp(pte->partition_type_guid.b, unused_guid.b,
 464                 sizeof(unused_guid.b)) == 0) {
 465
 466                 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
 467                 (unsigned int)pte);
 468
 469                 return 0;
 470         } else {
 471                 return 1;
 472         }
 473 }
 474 #endif