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_SATA) || \
  41     defined(CONFIG_CMD_SCSI) || \
  42     defined(CONFIG_CMD_USB) || \
  43     defined(CONFIG_MMC) || \
  44     defined(CONFIG_SYSTEMACE)
  45
  46 /* Convert char[2] in little endian format to the host format integer
  47  */
  48 static inline unsigned short le16_to_int(unsigned char *le16)
  49 {
  50         return ((le16[1] << 8) + le16[0]);
  51 }
  52
  53 /* Convert char[4] in little endian format to the host format integer
  54  */
  55 static inline unsigned long le32_to_int(unsigned char *le32)
  56 {
  57         return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]);
  58 }
  59
  60 /* Convert char[8] in little endian format to the host format integer
  61  */
  62 static inline unsigned long long le64_to_int(unsigned char *le64)
  63 {
  64         return (((unsigned long long)le64[7] << 56) +
  65                 ((unsigned long long)le64[6] << 48) +
  66                 ((unsigned long long)le64[5] << 40) +
  67                 ((unsigned long long)le64[4] << 32) +
  68                 ((unsigned long long)le64[3] << 24) +
  69                 ((unsigned long long)le64[2] << 16) +
  70                 ((unsigned long long)le64[1] << 8) +
  71                 (unsigned long long)le64[0]);
  72 }
  73
  74 /**
  75  * efi_crc32() - EFI version of crc32 function
  76  * @buf: buffer to calculate crc32 of
  77  * @len - length of buf
  78  *
  79  * Description: Returns EFI-style CRC32 value for @buf
  80  */
  81 static inline unsigned long efi_crc32(const void *buf, unsigned long len)
  82 {
  83         return crc32(0, buf, len);
  84 }
  85
  86 /*
  87  * Private function prototypes
  88  */
  89
  90 static int pmbr_part_valid(struct partition *part);
  91 static int is_pmbr_valid(legacy_mbr * mbr);
  92
  93 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
  94                                 gpt_header * pgpt_head, gpt_entry ** pgpt_pte);
  95
  96 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
  97                                 gpt_header * pgpt_head);
  98
  99 static int is_pte_valid(gpt_entry * pte);
 100
 101 /*
 102  * Public Functions (include/part.h)
 103  */
 104
 105 void print_part_efi(block_dev_desc_t * dev_desc)
 106 {
 107         gpt_header gpt_head;
 108         gpt_entry **pgpt_pte = NULL;
 109         int i = 0;
 110
 111         if (!dev_desc) {
 112                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 113                 return;
 114         }
 115         /* This function validates AND fills in the GPT header and PTE */
 116         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 117                          &(gpt_head), pgpt_pte) != 1) {
 118                 printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
 119                 return;
 120         }
 121
 122         debug("%s: gpt-entry at 0x%08X\n", __FUNCTION__, (unsigned int)*pgpt_pte);
 123
 124         printf("Part  Start LBA  End LBA\n");
 125         for (i = 0; i < le32_to_int(gpt_head.num_partition_entries); i++) {
 126
 127                 if (is_pte_valid(&(*pgpt_pte)[i])) {
 128                         printf("%s%d  0x%llX    0x%llX\n", GPT_ENTRY_NAME,
 129                                 (i + 1),
 130                                 le64_to_int((*pgpt_pte)[i].starting_lba),
 131                                 le64_to_int((*pgpt_pte)[i].ending_lba));
 132                 } else {
 133                         break;  /* Stop at the first non valid PTE */
 134                 }
 135         }
 136
 137         /* Remember to free pte */
 138         if (*pgpt_pte != NULL) {
 139                 debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
 140                 free(*pgpt_pte);
 141         }
 142         return;
 143 }
 144
 145 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 146                                 disk_partition_t * info)
 147 {
 148         gpt_header gpt_head;
 149         gpt_entry **pgpt_pte = NULL;
 150
 151         /* "part" argument must be at least 1 */
 152         if (!dev_desc || !info || part < 1) {
 153                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 154                 return -1;
 155         }
 156
 157         /* This function validates AND fills in the GPT header and PTE */
 158         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 159                         &(gpt_head), pgpt_pte) != 1) {
 160                 printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
 161                 return -1;
 162         }
 163
 164         /* The ulong casting limits the maximum disk size to 2 TB */
 165         info->start = (ulong) le64_to_int((*pgpt_pte)[part - 1].starting_lba);
 166         /* The ending LBA is inclusive, to calculate size, add 1 to it */
 167         info->size = ((ulong)le64_to_int((*pgpt_pte)[part - 1].ending_lba) + 1)
 168                      - info->start;
 169         info->blksz = GPT_BLOCK_SIZE;
 170
 171         sprintf((char *)info->name, "%s%d\n", GPT_ENTRY_NAME, part);
 172         sprintf((char *)info->type, "U-Boot");
 173
 174         debug("%s: start 0x%lX, size 0x%lX, name %s", __FUNCTION__,
 175                 info->start, info->size, info->name);
 176
 177         /* Remember to free pte */
 178         if (*pgpt_pte != NULL) {
 179                 debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
 180                 free(*pgpt_pte);
 181         }
 182         return 0;
 183 }
 184
 185 int test_part_efi(block_dev_desc_t * dev_desc)
 186 {
 187         legacy_mbr legacymbr;
 188
 189         /* Read legacy MBR from block 0 and validate it */
 190         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) & legacymbr) != 1)
 191                 || (is_pmbr_valid(&legacymbr) != 1)) {
 192                 return -1;
 193         }
 194         return 0;
 195 }
 196
 197 /*
 198  * Private functions
 199  */
 200 /*
 201  * pmbr_part_valid(): Check for EFI partition signature
 202  *
 203  * Returns: 1 if EFI GPT partition type is found.
 204  */
 205 static int pmbr_part_valid(struct partition *part)
 206 {
 207         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 208                 le32_to_int(part->start_sect) == 1UL) {
 209                 return 1;
 210         }
 211
 212         return 0;
 213 }
 214
 215 /*
 216  * is_pmbr_valid(): test Protective MBR for validity
 217  *
 218  * Returns: 1 if PMBR is valid, 0 otherwise.
 219  * Validity depends on two things:
 220  *  1) MSDOS signature is in the last two bytes of the MBR
 221  *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 222  */
 223 static int is_pmbr_valid(legacy_mbr * mbr)
 224 {
 225         int i = 0;
 226
 227         if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
 228                 return 0;
 229         }
 230
 231         for (i = 0; i < 4; i++) {
 232                 if (pmbr_part_valid(&mbr->partition_record[i])) {
 233                         return 1;
 234                 }
 235         }
 236         return 0;
 237 }
 238
 239 /**
 240  * is_gpt_valid() - tests one GPT header and PTEs for validity
 241  *
 242  * lba is the logical block address of the GPT header to test
 243  * gpt is a GPT header ptr, filled on return.
 244  * ptes is a PTEs ptr, filled on return.
 245  *
 246  * Description: returns 1 if valid,  0 on error.
 247  * If valid, returns pointers to PTEs.
 248  */
 249 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 250                         gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
 251 {
 252         unsigned char crc32_backup[4] = { 0 };
 253         unsigned long calc_crc32;
 254         unsigned long long lastlba;
 255
 256         if (!dev_desc || !pgpt_head) {
 257                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 258                 return 0;
 259         }
 260
 261         /* Read GPT Header from device */
 262         if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
 263                 printf("*** ERROR: Can't read GPT header ***\n");
 264                 return 0;
 265         }
 266
 267         /* Check the GPT header signature */
 268         if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
 269                 printf("GUID Partition Table Header signature is wrong:"
 270                         "0x%llX != 0x%llX\n",
 271                         (unsigned long long)le64_to_int(pgpt_head->signature),
 272                         (unsigned long long)GPT_HEADER_SIGNATURE);
 273                 return 0;
 274         }
 275
 276         /* Check the GUID Partition Table CRC */
 277         memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
 278         memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
 279
 280         calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
 281                 le32_to_int(pgpt_head->header_size));
 282
 283         memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
 284
 285         if (calc_crc32 != le32_to_int(crc32_backup)) {
 286                 printf("GUID Partition Table Header CRC is wrong:"
 287                         "0x%08lX != 0x%08lX\n",
 288                         le32_to_int(crc32_backup), calc_crc32);
 289                 return 0;
 290         }
 291
 292         /* Check that the my_lba entry points to the LBA that contains the GPT */
 293         if (le64_to_int(pgpt_head->my_lba) != lba) {
 294                 printf("GPT: my_lba incorrect: %llX != %llX\n",
 295                         (unsigned long long)le64_to_int(pgpt_head->my_lba),
 296                         (unsigned long long)lba);
 297                 return 0;
 298         }
 299
 300         /* Check the first_usable_lba and last_usable_lba are within the disk. */
 301         lastlba = (unsigned long long)dev_desc->lba;
 302         if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
 303                 printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
 304                         le64_to_int(pgpt_head->first_usable_lba), lastlba);
 305                 return 0;
 306         }
 307         if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
 308                 printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
 309                         le64_to_int(pgpt_head->last_usable_lba), lastlba);
 310                 return 0;
 311         }
 312
 313         debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
 314                 le64_to_int(pgpt_head->first_usable_lba),
 315                 le64_to_int(pgpt_head->last_usable_lba), lastlba);
 316
 317         /* Read and allocate Partition Table Entries */
 318         *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
 319         if (*pgpt_pte == NULL) {
 320                 printf("GPT: Failed to allocate memory for PTE\n");
 321                 return 0;
 322         }
 323
 324         /* Check the GUID Partition Table Entry Array CRC */
 325         calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
 326                 le32_to_int(pgpt_head->num_partition_entries) *
 327                 le32_to_int(pgpt_head->sizeof_partition_entry));
 328
 329         if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
 330                 printf("GUID Partition Table Entry Array CRC is wrong:"
 331                         "0x%08lX != 0x%08lX\n",
 332                         le32_to_int(pgpt_head->partition_entry_array_crc32),
 333                         calc_crc32);
 334
 335                 if (*pgpt_pte != NULL) {
 336                         free(*pgpt_pte);
 337                 }
 338                 return 0;
 339         }
 340
 341         /* We're done, all's well */
 342         return 1;
 343 }
 344
 345 /**
 346  * alloc_read_gpt_entries(): reads partition entries from disk
 347  * @dev_desc
 348  * @gpt - GPT header
 349  *
 350  * Description: Returns ptes on success,  NULL on error.
 351  * Allocates space for PTEs based on information found in @gpt.
 352  * Notes: remember to free pte when you're done!
 353  */
 354 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 355                                          gpt_header * pgpt_head)
 356 {
 357         size_t count = 0;
 358         gpt_entry *pte = NULL;
 359
 360         if (!dev_desc || !pgpt_head) {
 361                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 362                 return NULL;
 363         }
 364
 365         count = le32_to_int(pgpt_head->num_partition_entries) *
 366                 le32_to_int(pgpt_head->sizeof_partition_entry);
 367
 368         debug("%s: count = %lu * %lu = %u\n", __FUNCTION__,
 369                 le32_to_int(pgpt_head->num_partition_entries),
 370                 le32_to_int(pgpt_head->sizeof_partition_entry), count);
 371
 372         /* Allocate memory for PTE, remember to FREE */
 373         if (count != 0) {
 374                 pte = malloc(count);
 375         }
 376
 377         if (count == 0 || pte == NULL) {
 378                 printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
 379                         __FUNCTION__, count);
 380                 return NULL;
 381         }
 382
 383         /* Read GPT Entries from device */
 384         if (dev_desc->block_read (dev_desc->dev,
 385                 (unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
 386                 (lbaint_t) (count / GPT_BLOCK_SIZE), pte)
 387                 != (count / GPT_BLOCK_SIZE)) {
 388
 389                 printf("*** ERROR: Can't read GPT Entries ***\n");
 390                 free(pte);
 391                 return NULL;
 392         }
 393         return pte;
 394 }
 395
 396 /**
 397  * is_pte_valid(): validates a single Partition Table Entry
 398  * @gpt_entry - Pointer to a single Partition Table Entry
 399  *
 400  * Description: returns 1 if valid,  0 on error.
 401  */
 402 static int is_pte_valid(gpt_entry * pte)
 403 {
 404         efi_guid_t unused_guid;
 405
 406         if (!pte) {
 407                 printf("%s: Invalid Argument(s)\n", __FUNCTION__);
 408                 return 0;
 409         }
 410
 411         /* Only one validation for now:
 412          * The GUID Partition Type != Unused Entry (ALL-ZERO)
 413          */
 414         memset(unused_guid.b, 0, sizeof(unused_guid.b));
 415
 416         if (memcmp(pte->partition_type_guid.b, unused_guid.b,
 417                 sizeof(unused_guid.b)) == 0) {
 418
 419                 debug("%s: Found an unused PTE GUID at 0x%08X\n", __FUNCTION__,
 420                 (unsigned int)pte);
 421
 422                 return 0;
 423         } else {
 424                 return 1;
 425         }
 426 }
 427 #endif