part_efi.c 11.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
/*
 * Copyright (C) 2008 RuggedCom, Inc.
 * Richard Retanubun <RichardRetanubun@RuggedCom.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Problems with CFG_64BIT_LBA:
 *
 * struct disk_partition.start in include/part.h is sized as ulong.
 * When CFG_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t.
 * For now, it is cast back to ulong at assignment.
 *
 * This limits the maximum size of addressable storage to < 2 Terra Bytes
 */
#include <common.h>
#include <command.h>
#include <ide.h>
#include <malloc.h>
#include "part_efi.h"

#if (defined(CONFIG_CMD_IDE) || \
     defined(CONFIG_CMD_SATA) || \
     defined(CONFIG_CMD_SCSI) || \
     defined(CONFIG_CMD_USB) || \
     defined(CONFIG_MMC) || \
     defined(CONFIG_SYSTEMACE) ) && defined(CONFIG_EFI_PARTITION)

/* Convert char[2] in little endian format to the host format integer
 */
static inline unsigned short le16_to_int(unsigned char *le16)
{
	return ((le16[1] << 8) + le16[0]);
}

/* Convert char[4] in little endian format to the host format integer
 */
static inline unsigned long le32_to_int(unsigned char *le32)
{
	return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]);
}

/* Convert char[8] in little endian format to the host format integer
 */
static inline unsigned long long le64_to_int(unsigned char *le64)
{
	return (((unsigned long long)le64[7] << 56) +
		((unsigned long long)le64[6] << 48) +
		((unsigned long long)le64[5] << 40) +
		((unsigned long long)le64[4] << 32) +
		((unsigned long long)le64[3] << 24) +
		((unsigned long long)le64[2] << 16) +
		((unsigned long long)le64[1] << 8) +
		(unsigned long long)le64[0]);
}

/**
 * efi_crc32() - EFI version of crc32 function
 * @buf: buffer to calculate crc32 of
 * @len - length of buf
 *
 * Description: Returns EFI-style CRC32 value for @buf
 */
static inline unsigned long efi_crc32(const void *buf, unsigned long len)
{
	return crc32(0, buf, len);
}

/*
 * Private function prototypes
 */

static int pmbr_part_valid(struct partition *part);
static int is_pmbr_valid(legacy_mbr * mbr);

static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
				gpt_header * pgpt_head, gpt_entry ** pgpt_pte);

static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
				gpt_header * pgpt_head);

static int is_pte_valid(gpt_entry * pte);

/*
 * Public Functions (include/part.h)
 */

void print_part_efi(block_dev_desc_t * dev_desc)
{
	gpt_header gpt_head;
	gpt_entry **pgpt_pte = NULL;
	int i = 0;

	if (!dev_desc) {
		printf("%s: Invalid Argument(s)\n", __FUNCTION__);
		return;
	}
	/* This function validates AND fills in the GPT header and PTE */
	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
			 &(gpt_head), pgpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
		return;
	}

	debug("%s: gpt-entry at 0x%08X\n", __FUNCTION__, (unsigned int)*pgpt_pte);

	printf("Part  Start LBA  End LBA\n");
	for (i = 0; i < le32_to_int(gpt_head.num_partition_entries); i++) {

		if (is_pte_valid(&(*pgpt_pte)[i])) {
			printf("%s%d  0x%llX    0x%llX\n", GPT_ENTRY_NAME,
				(i + 1),
				le64_to_int((*pgpt_pte)[i].starting_lba),
				le64_to_int((*pgpt_pte)[i].ending_lba));
		} else {
			break;	/* Stop at the first non valid PTE */
		}
	}

	/* Remember to free pte */
	if (*pgpt_pte != NULL) {
		debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
		free(*pgpt_pte);
	}
	return;
}

int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
				disk_partition_t * info)
{
	gpt_header gpt_head;
	gpt_entry **pgpt_pte = NULL;

	/* "part" argument must be at least 1 */
	if (!dev_desc || !info || part < 1) {
		printf("%s: Invalid Argument(s)\n", __FUNCTION__);
		return -1;
	}

	/* This function validates AND fills in the GPT header and PTE */
	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
			&(gpt_head), pgpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
		return -1;
	}

	/* The ulong casting limits the maximum disk size to 2 TB */
	info->start = (ulong) le64_to_int((*pgpt_pte)[part - 1].starting_lba);
	info->size = (ulong) le64_to_int((*pgpt_pte)[part - 1].ending_lba) - info->start;
	info->blksz = GPT_BLOCK_SIZE;

	sprintf((char *)info->name, "%s%d\n", GPT_ENTRY_NAME, part);
	sprintf((char *)info->type, "U-Boot");

	debug("%s: start 0x%lX, size 0x%lX, name %s", __FUNCTION__,
		info->start, info->size, info->name);

	/* Remember to free pte */
	if (*pgpt_pte != NULL) {
		debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
		free(*pgpt_pte);
	}
	return 0;
}

int test_part_efi(block_dev_desc_t * dev_desc)
{
	legacy_mbr legacymbr;

	/* Read legacy MBR from block 0 and validate it */
	if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) & legacymbr) != 1)
		|| (is_pmbr_valid(&legacymbr) != 1)) {
		return -1;
	}
	return 0;
}

/*
 * Private functions
 */
/*
 * pmbr_part_valid(): Check for EFI partition signature
 *
 * Returns: 1 if EFI GPT partition type is found.
 */
static int pmbr_part_valid(struct partition *part)
{
	if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
		le32_to_int(part->start_sect) == 1UL) {
		return 1;
	}

	return 0;
}

/*
 * is_pmbr_valid(): test Protective MBR for validity
 *
 * Returns: 1 if PMBR is valid, 0 otherwise.
 * Validity depends on two things:
 *  1) MSDOS signature is in the last two bytes of the MBR
 *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
 */
static int is_pmbr_valid(legacy_mbr * mbr)
{
	int i = 0;

	if (!mbr || le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
		return 0;
	}

	for (i = 0; i < 4; i++) {
		if (pmbr_part_valid(&mbr->partition_record[i])) {
			return 1;
		}
	}
	return 0;
}

/**
 * is_gpt_valid() - tests one GPT header and PTEs for validity
 *
 * lba is the logical block address of the GPT header to test
 * gpt is a GPT header ptr, filled on return.
 * ptes is a PTEs ptr, filled on return.
 *
 * Description: returns 1 if valid,  0 on error.
 * If valid, returns pointers to PTEs.
 */
static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
			gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
{
	unsigned char crc32_backup[4] = { 0 };
	unsigned long calc_crc32;
	unsigned long long lastlba;

	if (!dev_desc || !pgpt_head) {
		printf("%s: Invalid Argument(s)\n", __FUNCTION__);
		return 0;
	}

	/* Read GPT Header from device */
	if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
		printf("*** ERROR: Can't read GPT header ***\n");
		return 0;
	}

	/* Check the GPT header signature */
	if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
		printf("GUID Partition Table Header signature is wrong:"
			"0x%llX != 0x%llX\n",
			(unsigned long long)le64_to_int(pgpt_head->signature),
			(unsigned long long)GPT_HEADER_SIGNATURE);
		return 0;
	}

	/* Check the GUID Partition Table CRC */
	memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
	memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));

	calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
		le32_to_int(pgpt_head->header_size));

	memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));

	if (calc_crc32 != le32_to_int(crc32_backup)) {
		printf("GUID Partition Table Header CRC is wrong:"
			"0x%08lX != 0x%08lX\n",
			le32_to_int(crc32_backup), calc_crc32);
		return 0;
	}

	/* Check that the my_lba entry points to the LBA that contains the GPT */
	if (le64_to_int(pgpt_head->my_lba) != lba) {
		printf("GPT: my_lba incorrect: %llX != %llX\n",
			(unsigned long long)le64_to_int(pgpt_head->my_lba),
			(unsigned long long)lba);
		return 0;
	}

	/* Check the first_usable_lba and last_usable_lba are within the disk. */
	lastlba = (unsigned long long)dev_desc->lba;
	if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
		printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
			le64_to_int(pgpt_head->first_usable_lba), lastlba);
		return 0;
	}
	if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
		printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
			le64_to_int(pgpt_head->last_usable_lba), lastlba);
		return 0;
	}

	debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
		le64_to_int(pgpt_head->first_usable_lba),
		le64_to_int(pgpt_head->last_usable_lba), lastlba);

	/* Read and allocate Partition Table Entries */
	*pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
	if (*pgpt_pte == NULL) {
		printf("GPT: Failed to allocate memory for PTE\n");
		return 0;
	}

	/* Check the GUID Partition Table Entry Array CRC */
	calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
		le32_to_int(pgpt_head->num_partition_entries) *
		le32_to_int(pgpt_head->sizeof_partition_entry));

	if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
		printf("GUID Partition Table Entry Array CRC is wrong:"
			"0x%08lX != 0x%08lX\n",
			le32_to_int(pgpt_head->partition_entry_array_crc32),
			calc_crc32);

		if (*pgpt_pte != NULL) {
			free(*pgpt_pte);
		}
		return 0;
	}

	/* We're done, all's well */
	return 1;
}

/**
 * alloc_read_gpt_entries(): reads partition entries from disk
 * @dev_desc
 * @gpt - GPT header
 *
 * Description: Returns ptes on success,  NULL on error.
 * Allocates space for PTEs based on information found in @gpt.
 * Notes: remember to free pte when you're done!
 */
static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
					 gpt_header * pgpt_head)
{
	size_t count = 0;
	gpt_entry *pte = NULL;

	if (!dev_desc || !pgpt_head) {
		printf("%s: Invalid Argument(s)\n", __FUNCTION__);
		return NULL;
	}

	count = le32_to_int(pgpt_head->num_partition_entries) *
		le32_to_int(pgpt_head->sizeof_partition_entry);

	debug("%s: count = %lu * %lu = %u\n", __FUNCTION__,
		le32_to_int(pgpt_head->num_partition_entries),
		le32_to_int(pgpt_head->sizeof_partition_entry), count);

	/* Allocate memory for PTE, remember to FREE */
	if (count != 0) {
		pte = malloc(count);
	}

	if (count == 0 || pte == NULL) {
		printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
			__FUNCTION__, count);
		return NULL;
	}

	/* Read GPT Entries from device */
	if (dev_desc->block_read (dev_desc->dev,
		(unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
		(lbaint_t) (count / GPT_BLOCK_SIZE), pte)
		!= (count / GPT_BLOCK_SIZE)) {

		printf("*** ERROR: Can't read GPT Entries ***\n");
		free(pte);
		return NULL;
	}
	return pte;
}

/**
 * is_pte_valid(): validates a single Partition Table Entry
 * @gpt_entry - Pointer to a single Partition Table Entry
 *
 * Description: returns 1 if valid,  0 on error.
 */
static int is_pte_valid(gpt_entry * pte)
{
	efi_guid_t unused_guid;

	if (!pte) {
		printf("%s: Invalid Argument(s)\n", __FUNCTION__);
		return 0;
	}

	/* Only one validation for now:
	 * The GUID Partition Type != Unused Entry (ALL-ZERO)
	 */
	memset(unused_guid.b, 0, sizeof(unused_guid.b));

	if (memcmp(pte->partition_type_guid.b, unused_guid.b,
		sizeof(unused_guid.b)) == 0) {

		debug("%s: Found an unused PTE GUID at 0x%08X\n", __FUNCTION__,
		(unsigned int)pte);

		return 0;
	} else {
		return 1;
	}
}
#endif