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 /*
 117  * Public Functions (include/part.h)
 118  */
 119
 120 void print_part_efi(block_dev_desc_t * dev_desc)
 121 {
 122         ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
 123         gpt_entry *gpt_pte = NULL;
 124         int i = 0;
 125
 126         if (!dev_desc) {
 127                 printf("%s: Invalid Argument(s)\n", __func__);
 128                 return;
 129         }
 130         /* This function validates AND fills in the GPT header and PTE */
 131         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 132                          gpt_head, &gpt_pte) != 1) {
 133                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 134                 return;
 135         }
 136
 137         debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
 138
 139         printf("Part\tName\t\t\tStart LBA\tEnd LBA\n");
 140         for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {
 141
 142                 if (is_pte_valid(&gpt_pte[i])) {
 143                         printf("%3d\t%-18s\t0x%08llX\t0x%08llX\n", (i + 1),
 144                                 print_efiname(&gpt_pte[i]),
 145                                 le64_to_int(gpt_pte[i].starting_lba),
 146                                 le64_to_int(gpt_pte[i].ending_lba));
 147                 } else {
 148                         break;  /* Stop at the first non valid PTE */
 149                 }
 150         }
 151
 152         /* Remember to free pte */
 153         free(gpt_pte);
 154         return;
 155 }
 156
 157 int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 158                                 disk_partition_t * info)
 159 {
 160         ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
 161         gpt_entry *gpt_pte = NULL;
 162
 163         /* "part" argument must be at least 1 */
 164         if (!dev_desc || !info || part < 1) {
 165                 printf("%s: Invalid Argument(s)\n", __func__);
 166                 return -1;
 167         }
 168
 169         /* This function validates AND fills in the GPT header and PTE */
 170         if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
 171                         gpt_head, &gpt_pte) != 1) {
 172                 printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
 173                 return -1;
 174         }
 175
 176         if (part > le32_to_int(gpt_head->num_partition_entries) ||
 177             !is_pte_valid(&gpt_pte[part - 1])) {
 178                 printf("%s: *** ERROR: Invalid partition number %d ***\n",
 179                         __func__, part);
 180                 return -1;
 181         }
 182
 183         /* The ulong casting limits the maximum disk size to 2 TB */
 184         info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
 185         /* The ending LBA is inclusive, to calculate size, add 1 to it */
 186         info->size = ((ulong)le64_to_int(gpt_pte[part - 1].ending_lba) + 1)
 187                      - info->start;
 188         info->blksz = GPT_BLOCK_SIZE;
 189
 190         sprintf((char *)info->name, "%s",
 191                         print_efiname(&gpt_pte[part - 1]));
 192         sprintf((char *)info->type, "U-Boot");
 193
 194         debug("%s: start 0x%lX, size 0x%lX, name %s", __func__,
 195                 info->start, info->size, info->name);
 196
 197         /* Remember to free pte */
 198         free(gpt_pte);
 199         return 0;
 200 }
 201
 202 int test_part_efi(block_dev_desc_t * dev_desc)
 203 {
 204         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1);
 205
 206         /* Read legacy MBR from block 0 and validate it */
 207         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
 208                 || (is_pmbr_valid(legacymbr) != 1)) {
 209                 return -1;
 210         }
 211         return 0;
 212 }
 213
 214 /*
 215  * Private functions
 216  */
 217 /*
 218  * pmbr_part_valid(): Check for EFI partition signature
 219  *
 220  * Returns: 1 if EFI GPT partition type is found.
 221  */
 222 static int pmbr_part_valid(struct partition *part)
 223 {
 224         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 225                 le32_to_int(part->start_sect) == 1UL) {
 226                 return 1;
 227         }
 228
 229         return 0;
 230 }
 231
 232 /*
 233  * is_pmbr_valid(): test Protective MBR for validity
 234  *
 235  * Returns: 1 if PMBR is valid, 0 otherwise.
 236  * Validity depends on two things:
 237  *  1) MSDOS signature is in the last two bytes of the MBR
 238  *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 239  */
 240 static int is_pmbr_valid(legacy_mbr * mbr)
 241 {
 242         int i = 0;
 243
 244         if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
 245                 return 0;
 246         }
 247
 248         for (i = 0; i < 4; i++) {
 249                 if (pmbr_part_valid(&mbr->partition_record[i])) {
 250                         return 1;
 251                 }
 252         }
 253         return 0;
 254 }
 255
 256 /**
 257  * is_gpt_valid() - tests one GPT header and PTEs for validity
 258  *
 259  * lba is the logical block address of the GPT header to test
 260  * gpt is a GPT header ptr, filled on return.
 261  * ptes is a PTEs ptr, filled on return.
 262  *
 263  * Description: returns 1 if valid,  0 on error.
 264  * If valid, returns pointers to PTEs.
 265  */
 266 static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 267                         gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
 268 {
 269         unsigned char crc32_backup[4] = { 0 };
 270         unsigned long calc_crc32;
 271         unsigned long long lastlba;
 272
 273         if (!dev_desc || !pgpt_head) {
 274                 printf("%s: Invalid Argument(s)\n", __func__);
 275                 return 0;
 276         }
 277
 278         /* Read GPT Header from device */
 279         if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
 280                 printf("*** ERROR: Can't read GPT header ***\n");
 281                 return 0;
 282         }
 283
 284         /* Check the GPT header signature */
 285         if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
 286                 printf("GUID Partition Table Header signature is wrong:"
 287                         "0x%llX != 0x%llX\n",
 288                         (unsigned long long)le64_to_int(pgpt_head->signature),
 289                         (unsigned long long)GPT_HEADER_SIGNATURE);
 290                 return 0;
 291         }
 292
 293         /* Check the GUID Partition Table CRC */
 294         memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
 295         memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
 296
 297         calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
 298                 le32_to_int(pgpt_head->header_size));
 299
 300         memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
 301
 302         if (calc_crc32 != le32_to_int(crc32_backup)) {
 303                 printf("GUID Partition Table Header CRC is wrong:"
 304                         "0x%08lX != 0x%08lX\n",
 305                         le32_to_int(crc32_backup), calc_crc32);
 306                 return 0;
 307         }
 308
 309         /* Check that the my_lba entry points to the LBA that contains the GPT */
 310         if (le64_to_int(pgpt_head->my_lba) != lba) {
 311                 printf("GPT: my_lba incorrect: %llX != %llX\n",
 312                         (unsigned long long)le64_to_int(pgpt_head->my_lba),
 313                         (unsigned long long)lba);
 314                 return 0;
 315         }
 316
 317         /* Check the first_usable_lba and last_usable_lba are within the disk. */
 318         lastlba = (unsigned long long)dev_desc->lba;
 319         if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
 320                 printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
 321                         le64_to_int(pgpt_head->first_usable_lba), lastlba);
 322                 return 0;
 323         }
 324         if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
 325                 printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
 326                         le64_to_int(pgpt_head->last_usable_lba), lastlba);
 327                 return 0;
 328         }
 329
 330         debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
 331                 le64_to_int(pgpt_head->first_usable_lba),
 332                 le64_to_int(pgpt_head->last_usable_lba), lastlba);
 333
 334         /* Read and allocate Partition Table Entries */
 335         *pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
 336         if (*pgpt_pte == NULL) {
 337                 printf("GPT: Failed to allocate memory for PTE\n");
 338                 return 0;
 339         }
 340
 341         /* Check the GUID Partition Table Entry Array CRC */
 342         calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
 343                 le32_to_int(pgpt_head->num_partition_entries) *
 344                 le32_to_int(pgpt_head->sizeof_partition_entry));
 345
 346         if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
 347                 printf("GUID Partition Table Entry Array CRC is wrong:"
 348                         "0x%08lX != 0x%08lX\n",
 349                         le32_to_int(pgpt_head->partition_entry_array_crc32),
 350                         calc_crc32);
 351
 352                 free(*pgpt_pte);
 353                 return 0;
 354         }
 355
 356         /* We're done, all's well */
 357         return 1;
 358 }
 359
 360 /**
 361  * alloc_read_gpt_entries(): reads partition entries from disk
 362  * @dev_desc
 363  * @gpt - GPT header
 364  *
 365  * Description: Returns ptes on success,  NULL on error.
 366  * Allocates space for PTEs based on information found in @gpt.
 367  * Notes: remember to free pte when you're done!
 368  */
 369 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 370                                          gpt_header * pgpt_head)
 371 {
 372         size_t count = 0;
 373         gpt_entry *pte = NULL;
 374
 375         if (!dev_desc || !pgpt_head) {
 376                 printf("%s: Invalid Argument(s)\n", __func__);
 377                 return NULL;
 378         }
 379
 380         count = le32_to_int(pgpt_head->num_partition_entries) *
 381                 le32_to_int(pgpt_head->sizeof_partition_entry);
 382
 383         debug("%s: count = %lu * %lu = %u\n", __func__,
 384                 le32_to_int(pgpt_head->num_partition_entries),
 385                 le32_to_int(pgpt_head->sizeof_partition_entry), count);
 386
 387         /* Allocate memory for PTE, remember to FREE */
 388         if (count != 0) {
 389                 pte = memalign(ARCH_DMA_MINALIGN, count);
 390         }
 391
 392         if (count == 0 || pte == NULL) {
 393                 printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
 394                         __func__, count);
 395                 return NULL;
 396         }
 397
 398         /* Read GPT Entries from device */
 399         if (dev_desc->block_read (dev_desc->dev,
 400                 (unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
 401                 (lbaint_t) (count / GPT_BLOCK_SIZE), pte)
 402                 != (count / GPT_BLOCK_SIZE)) {
 403
 404                 printf("*** ERROR: Can't read GPT Entries ***\n");
 405                 free(pte);
 406                 return NULL;
 407         }
 408         return pte;
 409 }
 410
 411 /**
 412  * is_pte_valid(): validates a single Partition Table Entry
 413  * @gpt_entry - Pointer to a single Partition Table Entry
 414  *
 415  * Description: returns 1 if valid,  0 on error.
 416  */
 417 static int is_pte_valid(gpt_entry * pte)
 418 {
 419         efi_guid_t unused_guid;
 420
 421         if (!pte) {
 422                 printf("%s: Invalid Argument(s)\n", __func__);
 423                 return 0;
 424         }
 425
 426         /* Only one validation for now:
 427          * The GUID Partition Type != Unused Entry (ALL-ZERO)
 428          */
 429         memset(unused_guid.b, 0, sizeof(unused_guid.b));
 430
 431         if (memcmp(pte->partition_type_guid.b, unused_guid.b,
 432                 sizeof(unused_guid.b)) == 0) {
 433
 434                 debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
 435                 (unsigned int)pte);
 436
 437                 return 0;
 438         } else {
 439                 return 1;
 440         }
 441 }
 442 #endif