[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"

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