[J-u-boot.git] / disk / part_efi.c

/*
 * Copyright (C) 2008 RuggedCom, Inc.
 * Richard Retanubun <[email protected]>
 *
 * 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 CONFIG_SYS_64BIT_LBA:
 *
 * struct disk_partition.start in include/part.h is sized as ulong.
 * When CONFIG_SYS_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"
#include <linux/ctype.h>

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

/* 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);

static char *print_efiname(gpt_entry *pte)
{
	static char name[PARTNAME_SZ + 1];
	int i;
	for (i = 0; i < PARTNAME_SZ; i++) {
		u8 c;
		c = pte->partition_name[i] & 0xff;
		c = (c && !isprint(c)) ? '.' : c;
		name[i] = c;
	}
	name[PARTNAME_SZ] = 0;
	return name;
}

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

void print_part_efi(block_dev_desc_t * dev_desc)
{
	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
	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\tName\t\t\tStart LBA\tEnd LBA\n");
	for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {

		if (is_pte_valid(&(*pgpt_pte)[i])) {
			printf("%3d\t%-18s\t0x%08llX\t0x%08llX\n", (i + 1),
				print_efiname(&(*pgpt_pte)[i]),
				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)
{
	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
	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);
	/* The ending LBA is inclusive, to calculate size, add 1 to it */
	info->size = ((ulong)le64_to_int((*pgpt_pte)[part - 1].ending_lba) + 1)
		     - info->start;
	info->blksz = GPT_BLOCK_SIZE;

	sprintf((char *)info->name, "%s",
			print_efiname(&(*pgpt_pte)[part - 1]));
	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)
{
	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1);

	/* 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 = memalign(CONFIG_SYS_CACHELINE_SIZE, 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
Commit	Line	Data
07f3d789	1	/*
	2	* Copyright (C) 2008 RuggedCom, Inc.
	3	* Richard Retanubun <[email protected]>
	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	/*
6d0f6bcf	25	* Problems with CONFIG_SYS_64BIT_LBA:
07f3d789	26	*
07f3d789	27	* struct disk_partition.start in include/part.h is sized as ulong.
6d0f6bcf	28	* When CONFIG_SYS_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t.
07f3d789	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"
6eecc030	38	#include <linux/ctype.h>
07f3d789	39
7bd2722e	40	#if defined(CONFIG_CMD_IDE) \|\| \
75eb82ec	41	defined(CONFIG_CMD_MG_DISK) \|\| \
7bd2722e MF	42	defined(CONFIG_CMD_SATA) \|\| \
	43	defined(CONFIG_CMD_SCSI) \|\| \
	44	defined(CONFIG_CMD_USB) \|\| \
	45	defined(CONFIG_MMC) \|\| \
	46	defined(CONFIG_SYSTEMACE)
07f3d789	47
	48	/* Convert char[2] in little endian format to the host format integer
	49	*/
	50	static inline unsigned short le16_to_int(unsigned char *le16)
	51	{
	52	return ((le16[1] << 8) + le16[0]);
	53	}
	54
	55	/* Convert char[4] in little endian format to the host format integer
	56	*/
	57	static inline unsigned long le32_to_int(unsigned char *le32)
	58	{
	59	return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]);
	60	}
	61
	62	/* Convert char[8] in little endian format to the host format integer
	63	*/
	64	static inline unsigned long long le64_to_int(unsigned char *le64)
	65	{
	66	return (((unsigned long long)le64[7] << 56) +
	67	((unsigned long long)le64[6] << 48) +
	68	((unsigned long long)le64[5] << 40) +
	69	((unsigned long long)le64[4] << 32) +
	70	((unsigned long long)le64[3] << 24) +
	71	((unsigned long long)le64[2] << 16) +
	72	((unsigned long long)le64[1] << 8) +
	73	(unsigned long long)le64[0]);
	74	}
	75
	76	/**
	77	* efi_crc32() - EFI version of crc32 function
	78	* @buf: buffer to calculate crc32 of
	79	* @len - length of buf
	80	*
	81	* Description: Returns EFI-style CRC32 value for @buf
	82	*/
	83	static inline unsigned long efi_crc32(const void *buf, unsigned long len)
	84	{
	85	return crc32(0, buf, len);
	86	}
	87
	88	/*
	89	* Private function prototypes
	90	*/
	91
	92	static int pmbr_part_valid(struct partition *part);
	93	static int is_pmbr_valid(legacy_mbr * mbr);
	94
	95	static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
	96	gpt_header * pgpt_head, gpt_entry ** pgpt_pte);
	97
	98	static gpt_entry alloc_read_gpt_entries(block_dev_desc_t dev_desc,
	99	gpt_header * pgpt_head);
	100
	101	static int is_pte_valid(gpt_entry * pte);
	102
6eecc030 LW	103	static char print_efiname(gpt_entry pte)
	104	{
	105	static char name[PARTNAME_SZ + 1];
	106	int i;
	107	for (i = 0; i < PARTNAME_SZ; i++) {
	108	u8 c;
	109	c = pte->partition_name[i] & 0xff;
	110	c = (c && !isprint(c)) ? '.' : c;
	111	name[i] = c;
	112	}
	113	name[PARTNAME_SZ] = 0;
	114	return name;
	115	}
	116
07f3d789	117	/*
	118	* Public Functions (include/part.h)
	119	*/
	120
	121	void print_part_efi(block_dev_desc_t * dev_desc)
	122	{
f75dd584	123	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
07f3d789	124	gpt_entry **pgpt_pte = NULL;
	125	int i = 0;
	126
	127	if (!dev_desc) {
	128	printf("%s: Invalid Argument(s)\n", __FUNCTION__);
	129	return;
	130	}
	131	/* This function validates AND fills in the GPT header and PTE */
	132	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
f75dd584	133	gpt_head, pgpt_pte) != 1) {
07f3d789	134	printf("%s: * ERROR: Invalid GPT *\n", __FUNCTION__);
	135	return;
	136	}
	137
	138	debug("%s: gpt-entry at 0x%08X\n", __FUNCTION__, (unsigned int)*pgpt_pte);
	139
6eecc030	140	printf("Part\tName\t\t\tStart LBA\tEnd LBA\n");
f75dd584	141	for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {
07f3d789	142
07f3d789	143	if (is_pte_valid(&(*pgpt_pte)[i])) {
6eecc030 LW	144	printf("%3d\t%-18s\t0x%08llX\t0x%08llX\n", (i + 1),
6eecc030 LW	145	print_efiname(&(*pgpt_pte)[i]),
07f3d789	146	le64_to_int((*pgpt_pte)[i].starting_lba),
	147	le64_to_int((*pgpt_pte)[i].ending_lba));
	148	} else {
	149	break; /* Stop at the first non valid PTE */
	150	}
	151	}
	152
	153	/* Remember to free pte */
	154	if (*pgpt_pte != NULL) {
	155	debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
	156	free(*pgpt_pte);
	157	}
	158	return;
	159	}
	160
	161	int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
	162	disk_partition_t * info)
	163	{
f75dd584	164	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
07f3d789	165	gpt_entry **pgpt_pte = NULL;
	166
	167	/* "part" argument must be at least 1 */
	168	if (!dev_desc \|\| !info \|\| part < 1) {
	169	printf("%s: Invalid Argument(s)\n", __FUNCTION__);
	170	return -1;
	171	}
	172
	173	/* This function validates AND fills in the GPT header and PTE */
	174	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
f75dd584	175	gpt_head, pgpt_pte) != 1) {
07f3d789	176	printf("%s: * ERROR: Invalid GPT *\n", __FUNCTION__);
	177	return -1;
	178	}
	179
	180	/* The ulong casting limits the maximum disk size to 2 TB */
	181	info->start = (ulong) le64_to_int((*pgpt_pte)[part - 1].starting_lba);
50970839 RR	182	/* The ending LBA is inclusive, to calculate size, add 1 to it */
	183	info->size = ((ulong)le64_to_int((*pgpt_pte)[part - 1].ending_lba) + 1)
	184	- info->start;
07f3d789	185	info->blksz = GPT_BLOCK_SIZE;
07f3d789	186
6eecc030 LW	187	sprintf((char *)info->name, "%s",
6eecc030 LW	188	print_efiname(&(*pgpt_pte)[part - 1]));
07f3d789	189	sprintf((char *)info->type, "U-Boot");
	190
	191	debug("%s: start 0x%lX, size 0x%lX, name %s", __FUNCTION__,
	192	info->start, info->size, info->name);
	193
	194	/* Remember to free pte */
	195	if (*pgpt_pte != NULL) {
	196	debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
	197	free(*pgpt_pte);
	198	}
	199	return 0;
	200	}
	201
	202	int test_part_efi(block_dev_desc_t * dev_desc)
	203	{
f75dd584	204	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1);
07f3d789	205
07f3d789	206	/* Read legacy MBR from block 0 and validate it */
f75dd584 A	207	if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
f75dd584 A	208	\|\| (is_pmbr_valid(legacymbr) != 1)) {
07f3d789	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", __FUNCTION__);
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	if (*pgpt_pte != NULL) {
353	free(*pgpt_pte);
354	}
355	return 0;
356	}
357
358	/* We're done, all's well */
359	return 1;
360	}
361
362	/**
363	* alloc_read_gpt_entries(): reads partition entries from disk
364	* @dev_desc
365	* @gpt - GPT header
366	*
367	* Description: Returns ptes on success, NULL on error.
368	* Allocates space for PTEs based on information found in @gpt.
369	* Notes: remember to free pte when you're done!
370	*/
371	static gpt_entry alloc_read_gpt_entries(block_dev_desc_t dev_desc,
372	gpt_header * pgpt_head)
373	{
374	size_t count = 0;
375	gpt_entry *pte = NULL;
376
377	if (!dev_desc \|\| !pgpt_head) {
378	printf("%s: Invalid Argument(s)\n", __FUNCTION__);
379	return NULL;
380	}
381
382	count = le32_to_int(pgpt_head->num_partition_entries) *
383	le32_to_int(pgpt_head->sizeof_partition_entry);
384
385	debug("%s: count = %lu * %lu = %u\n", __FUNCTION__,
386	le32_to_int(pgpt_head->num_partition_entries),
387	le32_to_int(pgpt_head->sizeof_partition_entry), count);
388
389	/* Allocate memory for PTE, remember to FREE */
390	if (count != 0) {
f75dd584	391	pte = memalign(CONFIG_SYS_CACHELINE_SIZE, count);
07f3d789	392	}
	393
	394	if (count == 0 \|\| pte == NULL) {
	395	printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
	396	__FUNCTION__, count);
	397	return NULL;
	398	}
	399
	400	/* Read GPT Entries from device */
	401	if (dev_desc->block_read (dev_desc->dev,
	402	(unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
	403	(lbaint_t) (count / GPT_BLOCK_SIZE), pte)
	404	!= (count / GPT_BLOCK_SIZE)) {
	405
	406	printf("* ERROR: Can't read GPT Entries *\n");
	407	free(pte);
	408	return NULL;
	409	}
	410	return pte;
	411	}
	412
	413	/**
	414	* is_pte_valid(): validates a single Partition Table Entry
	415	* @gpt_entry - Pointer to a single Partition Table Entry
	416	*
	417	* Description: returns 1 if valid, 0 on error.
	418	*/
	419	static int is_pte_valid(gpt_entry * pte)
	420	{
	421	efi_guid_t unused_guid;
	422
	423	if (!pte) {
	424	printf("%s: Invalid Argument(s)\n", __FUNCTION__);
	425	return 0;
	426	}
	427
	428	/* Only one validation for now:
	429	* The GUID Partition Type != Unused Entry (ALL-ZERO)
	430	*/
	431	memset(unused_guid.b, 0, sizeof(unused_guid.b));
	432
	433	if (memcmp(pte->partition_type_guid.b, unused_guid.b,
	434	sizeof(unused_guid.b)) == 0) {
	435
	436	debug("%s: Found an unused PTE GUID at 0x%08X\n", __FUNCTION__,
	437	(unsigned int)pte);
	438
	439	return 0;
	440	} else {
	441	return 1;
	442	}
	443	}
	444	#endif