Add support for CONFIG_EFI_PARTITION (GUID Partition Table)

The GUID (Globally Unique Identifier) Partition Table (GPT) is a part
of EFI. See http://en.wikipedia.org/wiki/GUID_Partition_Table

Based on linux/fs/partitions/efi.[ch]

Signed-off-by: Richard Retanubun <RichardRetanubun@RugggedCom.com>

1 files changed, 425 insertions, 0 deletions

diff --git a/disk/part_efi.c b/disk/part_efi.c
new file mode 100644
index 0000000..979019a
--- /dev/null
+++ b/disk/part_efi.c
@@ -0,0 +1,425 @@
+/*
+ * 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