[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_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;
}

static void uuid_string(unsigned char *uuid, char *str)
{
	static const u8 le[16] = {3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11,
				  12, 13, 14, 15};
	int i;

	for (i = 0; i < 16; i++) {
		sprintf(str, "%02x", uuid[le[i]]);
		str += 2;
		switch (i) {
		case 3:
		case 5:
		case 7:
		case 9:
			*str++ = '-';
			break;
		}
	}
}

static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;

static inline int is_bootable(gpt_entry *p)
{
	return p->attributes.fields.legacy_bios_bootable ||
		!memcmp(&(p->partition_type_guid), &system_guid,
			sizeof(efi_guid_t));
}

/*
 * 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 *gpt_pte = NULL;
	int i = 0;
	char uuid[37];

	if (!dev_desc) {
		printf("%s: Invalid Argument(s)\n", __func__);
		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, &gpt_pte) != 1) {
		printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
		return;
	}

	debug("%s: gpt-entry at %p\n", __func__, gpt_pte);

	printf("Part\tStart LBA\tEnd LBA\t\tName\n");
	printf("\tAttributes\n");
	printf("\tType UUID\n");
	printf("\tPartition UUID\n");

	for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {
		/* Stop at the first non valid PTE */
		if (!is_pte_valid(&gpt_pte[i]))
			break;

		printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
			le64_to_int(gpt_pte[i].starting_lba),
			le64_to_int(gpt_pte[i].ending_lba),
			print_efiname(&gpt_pte[i]));
		printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
		uuid_string(gpt_pte[i].partition_type_guid.b, uuid);
		printf("\ttype:\t%s\n", uuid);
		uuid_string(gpt_pte[i].unique_partition_guid.b, uuid);
		printf("\tuuid:\t%s\n", uuid);
	}

	/* Remember to free pte */
	free(gpt_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 *gpt_pte = NULL;

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

	if (part > le32_to_int(gpt_head->num_partition_entries) ||
	    !is_pte_valid(&gpt_pte[part - 1])) {
		printf("%s: *** ERROR: Invalid partition number %d ***\n",
			__func__, part);
		return -1;
	}

	/* The ulong casting limits the maximum disk size to 2 TB */
	info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
	/* The ending LBA is inclusive, to calculate size, add 1 to it */
	info->size = ((ulong)le64_to_int(gpt_pte[part - 1].ending_lba) + 1)
		     - info->start;
	info->blksz = GPT_BLOCK_SIZE;

	sprintf((char *)info->name, "%s",
			print_efiname(&gpt_pte[part - 1]));
	sprintf((char *)info->type, "U-Boot");
	info->bootable = is_bootable(&gpt_pte[part - 1]);
#ifdef CONFIG_PARTITION_UUIDS
	uuid_string(gpt_pte[part - 1].unique_partition_guid.b, info->uuid);
#endif

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

	/* Remember to free pte */
	free(gpt_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", __func__);
		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);

		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", __func__);
		return NULL;
	}

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

	debug("%s: count = %lu * %lu = %zu\n", __func__,
		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(ARCH_DMA_MINALIGN, count);
	}

	if (count == 0 || pte == NULL) {
		printf("%s: ERROR: Can't allocate 0x%zX "
		       "bytes for GPT Entries\n",
			__func__, 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", __func__);
		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", __func__,
		      (unsigned int)(uintptr_t)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 MF	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)
07f3d789	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
6eecc030 LW	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
f07cd2c4 SW	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
b4414f4a SW	136	static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
	137
	138	static inline int is_bootable(gpt_entry *p)
	139	{
	140	return p->attributes.fields.legacy_bios_bootable \|\|
	141	!memcmp(&(p->partition_type_guid), &system_guid,
	142	sizeof(efi_guid_t));
	143	}
	144
07f3d789	145	/*
	146	* Public Functions (include/part.h)
	147	*/
	148
	149	void print_part_efi(block_dev_desc_t * dev_desc)
	150	{
f75dd584	151	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
deb5ca80	152	gpt_entry *gpt_pte = NULL;
07f3d789	153	int i = 0;
f07cd2c4	154	char uuid[37];
07f3d789	155
07f3d789	156	if (!dev_desc) {
df70b1c2	157	printf("%s: Invalid Argument(s)\n", __func__);
07f3d789	158	return;
	159	}
	160	/* This function validates AND fills in the GPT header and PTE */
	161	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
4715a811	162	gpt_head, &gpt_pte) != 1) {
df70b1c2	163	printf("%s: * ERROR: Invalid GPT *\n", __func__);
07f3d789	164	return;
	165	}
	166
deb5ca80	167	debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
07f3d789	168
788a8c1f	169	printf("Part\tStart LBA\tEnd LBA\t\tName\n");
13bf2f55	170	printf("\tAttributes\n");
f07cd2c4 SW	171	printf("\tType UUID\n");
	172	printf("\tPartition UUID\n");
	173
f75dd584	174	for (i = 0; i < le32_to_int(gpt_head->num_partition_entries); i++) {
38a3021e SW	175	/* Stop at the first non valid PTE */
	176	if (!is_pte_valid(&gpt_pte[i]))
	177	break;
	178
788a8c1f	179	printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
38a3021e	180	le64_to_int(gpt_pte[i].starting_lba),
788a8c1f SW	181	le64_to_int(gpt_pte[i].ending_lba),
788a8c1f SW	182	print_efiname(&gpt_pte[i]));
13bf2f55	183	printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
f07cd2c4 SW	184	uuid_string(gpt_pte[i].partition_type_guid.b, uuid);
	185	printf("\ttype:\t%s\n", uuid);
	186	uuid_string(gpt_pte[i].unique_partition_guid.b, uuid);
	187	printf("\tuuid:\t%s\n", uuid);
07f3d789	188	}
	189
	190	/* Remember to free pte */
deb5ca80	191	free(gpt_pte);
07f3d789	192	return;
	193	}
	194
	195	int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
	196	disk_partition_t * info)
	197	{
f75dd584	198	ALLOC_CACHE_ALIGN_BUFFER(gpt_header, gpt_head, 1);
deb5ca80	199	gpt_entry *gpt_pte = NULL;
07f3d789	200
	201	/* "part" argument must be at least 1 */
	202	if (!dev_desc \|\| !info \|\| part < 1) {
df70b1c2	203	printf("%s: Invalid Argument(s)\n", __func__);
07f3d789	204	return -1;
	205	}
	206
	207	/* This function validates AND fills in the GPT header and PTE */
	208	if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
4715a811	209	gpt_head, &gpt_pte) != 1) {
df70b1c2	210	printf("%s: * ERROR: Invalid GPT *\n", __func__);
07f3d789	211	return -1;
	212	}
	213
c04d68c6 SW	214	if (part > le32_to_int(gpt_head->num_partition_entries) \|\|
	215	!is_pte_valid(&gpt_pte[part - 1])) {
	216	printf("%s: * ERROR: Invalid partition number %d *\n",
	217	__func__, part);
	218	return -1;
	219	}
	220
07f3d789	221	/* The ulong casting limits the maximum disk size to 2 TB */
deb5ca80	222	info->start = (ulong) le64_to_int(gpt_pte[part - 1].starting_lba);
50970839	223	/* The ending LBA is inclusive, to calculate size, add 1 to it */
deb5ca80	224	info->size = ((ulong)le64_to_int(gpt_pte[part - 1].ending_lba) + 1)
50970839	225	- info->start;
07f3d789	226	info->blksz = GPT_BLOCK_SIZE;
07f3d789	227
6eecc030	228	sprintf((char *)info->name, "%s",
deb5ca80	229	print_efiname(&gpt_pte[part - 1]));
07f3d789	230	sprintf((char *)info->type, "U-Boot");
b4414f4a	231	info->bootable = is_bootable(&gpt_pte[part - 1]);
894bfbbf SW	232	#ifdef CONFIG_PARTITION_UUIDS
	233	uuid_string(gpt_pte[part - 1].unique_partition_guid.b, info->uuid);
	234	#endif
07f3d789	235
df70b1c2	236	debug("%s: start 0x%lX, size 0x%lX, name %s", __func__,
07f3d789	237	info->start, info->size, info->name);
	238
	239	/* Remember to free pte */
deb5ca80	240	free(gpt_pte);
07f3d789	241	return 0;
	242	}
	243
	244	int test_part_efi(block_dev_desc_t * dev_desc)
	245	{
f75dd584	246	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, legacymbr, 1);
07f3d789	247
07f3d789	248	/* Read legacy MBR from block 0 and validate it */
f75dd584 A	249	if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
f75dd584 A	250	\|\| (is_pmbr_valid(legacymbr) != 1)) {
07f3d789	251	return -1;
	252	}
	253	return 0;
	254	}
	255
	256	/*
	257	* Private functions
	258	*/
	259	/*
	260	* pmbr_part_valid(): Check for EFI partition signature
	261	*
	262	* Returns: 1 if EFI GPT partition type is found.
	263	*/
	264	static int pmbr_part_valid(struct partition *part)
	265	{
	266	if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
	267	le32_to_int(part->start_sect) == 1UL) {
	268	return 1;
	269	}
	270
	271	return 0;
	272	}
	273
	274	/*
	275	* is_pmbr_valid(): test Protective MBR for validity
	276	*
	277	* Returns: 1 if PMBR is valid, 0 otherwise.
	278	* Validity depends on two things:
	279	* 1) MSDOS signature is in the last two bytes of the MBR
	280	* 2) One partition of type 0xEE is found, checked by pmbr_part_valid()
	281	*/
	282	static int is_pmbr_valid(legacy_mbr * mbr)
	283	{
	284	int i = 0;
	285
	286	if (!mbr \|\| le16_to_int(mbr->signature) != MSDOS_MBR_SIGNATURE) {
	287	return 0;
	288	}
	289
	290	for (i = 0; i < 4; i++) {
	291	if (pmbr_part_valid(&mbr->partition_record[i])) {
	292	return 1;
	293	}
	294	}
	295	return 0;
	296	}
	297
	298	/**
	299	* is_gpt_valid() - tests one GPT header and PTEs for validity
	300	*
	301	* lba is the logical block address of the GPT header to test
	302	* gpt is a GPT header ptr, filled on return.
	303	* ptes is a PTEs ptr, filled on return.
	304	*
	305	* Description: returns 1 if valid, 0 on error.
	306	* If valid, returns pointers to PTEs.
	307	*/
	308	static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
	309	gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
	310	{
	311	unsigned char crc32_backup[4] = { 0 };
	312	unsigned long calc_crc32;
	313	unsigned long long lastlba;
	314
315	if (!dev_desc \|\| !pgpt_head) {
df70b1c2	316	printf("%s: Invalid Argument(s)\n", __func__);
07f3d789	317	return 0;
	318	}
	319
	320	/* Read GPT Header from device */
	321	if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
	322	printf("* ERROR: Can't read GPT header *\n");
	323	return 0;
	324	}
	325
	326	/* Check the GPT header signature */
	327	if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
	328	printf("GUID Partition Table Header signature is wrong:"
	329	"0x%llX != 0x%llX\n",
	330	(unsigned long long)le64_to_int(pgpt_head->signature),
	331	(unsigned long long)GPT_HEADER_SIGNATURE);
	332	return 0;
	333	}
	334
	335	/* Check the GUID Partition Table CRC */
	336	memcpy(crc32_backup, pgpt_head->header_crc32, sizeof(crc32_backup));
	337	memset(pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
	338
	339	calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
	340	le32_to_int(pgpt_head->header_size));
	341
	342	memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
	343
	344	if (calc_crc32 != le32_to_int(crc32_backup)) {
	345	printf("GUID Partition Table Header CRC is wrong:"
	346	"0x%08lX != 0x%08lX\n",
	347	le32_to_int(crc32_backup), calc_crc32);
	348	return 0;
	349	}
	350
	351	/* Check that the my_lba entry points to the LBA that contains the GPT */
	352	if (le64_to_int(pgpt_head->my_lba) != lba) {
	353	printf("GPT: my_lba incorrect: %llX != %llX\n",
	354	(unsigned long long)le64_to_int(pgpt_head->my_lba),
	355	(unsigned long long)lba);
	356	return 0;
	357	}
	358
	359	/* Check the first_usable_lba and last_usable_lba are within the disk. */
	360	lastlba = (unsigned long long)dev_desc->lba;
	361	if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
	362	printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
	363	le64_to_int(pgpt_head->first_usable_lba), lastlba);
	364	return 0;
	365	}
	366	if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
	367	printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
	368	le64_to_int(pgpt_head->last_usable_lba), lastlba);
	369	return 0;
	370	}
	371
	372	debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
	373	le64_to_int(pgpt_head->first_usable_lba),
	374	le64_to_int(pgpt_head->last_usable_lba), lastlba);
	375
	376	/* Read and allocate Partition Table Entries */
	377	*pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
	378	if (*pgpt_pte == NULL) {
	379	printf("GPT: Failed to allocate memory for PTE\n");
	380	return 0;
381	}
382
383	/* Check the GUID Partition Table Entry Array CRC */
384	calc_crc32 = efi_crc32((const unsigned char )pgpt_pte,
385	le32_to_int(pgpt_head->num_partition_entries) *
386	le32_to_int(pgpt_head->sizeof_partition_entry));
387
388	if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
389	printf("GUID Partition Table Entry Array CRC is wrong:"
390	"0x%08lX != 0x%08lX\n",
391	le32_to_int(pgpt_head->partition_entry_array_crc32),
392	calc_crc32);
393
deb5ca80	394	free(*pgpt_pte);
07f3d789	395	return 0;
	396	}
	397
	398	/* We're done, all's well */
	399	return 1;
	400	}
	401
	402	/**
	403	* alloc_read_gpt_entries(): reads partition entries from disk
	404	* @dev_desc
	405	* @gpt - GPT header
	406	*
	407	* Description: Returns ptes on success, NULL on error.
	408	* Allocates space for PTEs based on information found in @gpt.
	409	* Notes: remember to free pte when you're done!
	410	*/
	411	static gpt_entry alloc_read_gpt_entries(block_dev_desc_t dev_desc,
	412	gpt_header * pgpt_head)
	413	{
	414	size_t count = 0;
	415	gpt_entry *pte = NULL;
	416
	417	if (!dev_desc \|\| !pgpt_head) {
df70b1c2	418	printf("%s: Invalid Argument(s)\n", __func__);
07f3d789	419	return NULL;
	420	}
	421
	422	count = le32_to_int(pgpt_head->num_partition_entries) *
	423	le32_to_int(pgpt_head->sizeof_partition_entry);
	424
9936be31	425	debug("%s: count = %lu * %lu = %zu\n", __func__,
07f3d789	426	le32_to_int(pgpt_head->num_partition_entries),
	427	le32_to_int(pgpt_head->sizeof_partition_entry), count);
	428
	429	/* Allocate memory for PTE, remember to FREE */
	430	if (count != 0) {
29b7042a	431	pte = memalign(ARCH_DMA_MINALIGN, count);
07f3d789	432	}
	433
	434	if (count == 0 \|\| pte == NULL) {
9936be31 TH	435	printf("%s: ERROR: Can't allocate 0x%zX "
9936be31 TH	436	"bytes for GPT Entries\n",
df70b1c2	437	__func__, count);
07f3d789	438	return NULL;
	439	}
	440
	441	/* Read GPT Entries from device */
	442	if (dev_desc->block_read (dev_desc->dev,
	443	(unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
	444	(lbaint_t) (count / GPT_BLOCK_SIZE), pte)
	445	!= (count / GPT_BLOCK_SIZE)) {
	446
	447	printf("* ERROR: Can't read GPT Entries *\n");
	448	free(pte);
	449	return NULL;
	450	}
	451	return pte;
	452	}
	453
	454	/**
	455	* is_pte_valid(): validates a single Partition Table Entry
	456	* @gpt_entry - Pointer to a single Partition Table Entry
	457	*
	458	* Description: returns 1 if valid, 0 on error.
	459	*/
	460	static int is_pte_valid(gpt_entry * pte)
	461	{
	462	efi_guid_t unused_guid;
	463
	464	if (!pte) {
df70b1c2	465	printf("%s: Invalid Argument(s)\n", __func__);
07f3d789	466	return 0;
	467	}
	468
	469	/* Only one validation for now:
	470	* The GUID Partition Type != Unused Entry (ALL-ZERO)
	471	*/
	472	memset(unused_guid.b, 0, sizeof(unused_guid.b));
	473
	474	if (memcmp(pte->partition_type_guid.b, unused_guid.b,
	475	sizeof(unused_guid.b)) == 0) {
	476
df70b1c2	477	debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
9936be31	478	(unsigned int)(uintptr_t)pte);
07f3d789	479
	480	return 0;
	481	} else {
	482	return 1;
	483	}
	484	}
	485	#endif