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>

4 files changed, 594 insertions, 3 deletions

diff --git a/disk/Makefile b/disk/Makefile
index f19d18d89f6..c4791451c4f 100644
--- a/disk/Makefile
+++ b/disk/Makefile
@@ -32,6 +32,7 @@ COBJS-y += part_mac.o
 COBJS-y += part_dos.o
 COBJS-y += part_iso.o
 COBJS-y += part_amiga.o
+COBJS-y += part_efi.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/disk/part.c b/disk/part.c
index 80532a7a7c2..e2bf4ab840c 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -212,7 +212,8 @@ void dev_print (block_dev_desc_t *dev_desc)
 #if defined(CONFIG_MAC_PARTITION) || \
     defined(CONFIG_DOS_PARTITION) || \
     defined(CONFIG_ISO_PARTITION) || \
-    defined(CONFIG_AMIGA_PARTITION)
+    defined(CONFIG_AMIGA_PARTITION) || \
+    defined(CONFIG_EFI_PARTITION)
 
 void init_part (block_dev_desc_t * dev_desc)
 {
@@ -230,6 +231,14 @@ void init_part (block_dev_desc_t * dev_desc)
 	}
 #endif
 
+/* must be placed before DOS partition detection */
+#ifdef CONFIG_EFI_PARTITION
+	if (test_part_efi(dev_desc) == 0) {
+		dev_desc->part_type = PART_TYPE_EFI;
+		return;
+	}
+#endif
+
 #ifdef CONFIG_DOS_PARTITION
 	if (test_part_dos(dev_desc) == 0) {
 		dev_desc->part_type = PART_TYPE_DOS;
@@ -286,6 +295,15 @@ int get_partition_info (block_dev_desc_t *dev_desc, int part
 	    }
 	    break;
 #endif
+
+#ifdef CONFIG_EFI_PARTITION
+	case PART_TYPE_EFI:
+		if (get_partition_info_efi(dev_desc,part,info) == 0) {
+			PRINTF ("## Valid EFI partition found ##\n");
+			return (0);
+		}
+		break;
+#endif
 	default:
 		break;
 	}
@@ -356,14 +374,23 @@ void print_part (block_dev_desc_t * dev_desc)
 	    print_part_amiga (dev_desc);
 	    return;
 #endif
+
+#ifdef CONFIG_EFI_PARTITION
+	case PART_TYPE_EFI:
+		PRINTF ("## Testing for valid EFI partition ##\n");
+		print_part_header ("EFI", dev_desc);
+		print_part_efi (dev_desc);
+		return;
+#endif
 	}
 	puts ("## Unknown partition table\n");
 }
 
 
-#else	/* neither MAC nor DOS nor ISO partition configured */
+#else	/* neither MAC nor DOS nor ISO nor AMIGA nor EFI partition configured */
 # error neither CONFIG_MAC_PARTITION nor CONFIG_DOS_PARTITION
-# error nor CONFIG_ISO_PARTITION configured!
+# error nor CONFIG_ISO_PARTITION nor CONFIG_AMIGA_PARTITION
+# error nor CONFIG_EFI_PARTITION configured!
 #endif
 
 #endif
diff --git a/disk/part_efi.c b/disk/part_efi.c
new file mode 100644
index 00000000000..979019ac801
--- /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
diff --git a/disk/part_efi.h b/disk/part_efi.h
new file mode 100644
index 00000000000..aad905daa77
--- /dev/null
+++ b/disk/part_efi.h
@@ -0,0 +1,138 @@
+/*
+ * 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
+ */
+
+/*
+ * See also linux/fs/partitions/efi.h
+ *
+ * EFI GUID Partition Table
+ * Per Intel EFI Specification v1.02
+ * http://developer.intel.com/technology/efi/efi.htm
+*/
+
+#ifndef _DISK_PART_EFI_H
+#define _DISK_PART_EFI_H
+
+#define MSDOS_MBR_SIGNATURE 0xAA55
+#define EFI_PMBR_OSTYPE_EFI 0xEF
+#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
+
+#define GPT_BLOCK_SIZE 512
+#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
+#define GPT_HEADER_REVISION_V1 0x00010000
+#define GPT_PRIMARY_PARTITION_TABLE_LBA 1ULL
+#define GPT_ENTRY_NAME "gpt"
+
+#define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
+((efi_guid_t) \
+{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
+  (b) & 0xff, ((b) >> 8) & 0xff, \
+  (c) & 0xff, ((c) >> 8) & 0xff, \
+  (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
+
+#define PARTITION_SYSTEM_GUID \
+    EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
+              0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
+#define LEGACY_MBR_PARTITION_GUID \
+    EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
+              0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
+#define PARTITION_MSFT_RESERVED_GUID \
+    EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
+              0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
+#define PARTITION_BASIC_DATA_GUID \
+    EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
+              0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
+#define PARTITION_LINUX_RAID_GUID \
+    EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
+              0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
+#define PARTITION_LINUX_SWAP_GUID \
+    EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
+              0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
+#define PARTITION_LINUX_LVM_GUID \
+    EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
+              0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+
+/* linux/include/efi.h */
+typedef unsigned short efi_char16_t;
+
+typedef struct {
+	unsigned char b[16];
+} efi_guid_t;
+
+/* based on linux/include/genhd.h */
+struct partition {
+	unsigned char boot_ind;	/* 0x80 - active */
+	unsigned char head;	/* starting head */
+	unsigned char sector;	/* starting sector */
+	unsigned char cyl;	/* starting cylinder */
+	unsigned char sys_ind;	/* What partition type */
+	unsigned char end_head;	/* end head */
+	unsigned char end_sector;	/* end sector */
+	unsigned char end_cyl;	/* end cylinder */
+	unsigned char start_sect[4];	/* starting sector counting from 0 */
+	unsigned char nr_sects[4];	/* nr of sectors in partition */
+} __attribute__ ((packed));
+
+/* based on linux/fs/partitions/efi.h */
+typedef struct _gpt_header {
+	unsigned char signature[8];
+	unsigned char revision[4];
+	unsigned char header_size[4];
+	unsigned char header_crc32[4];
+	unsigned char reserved1[4];
+	unsigned char my_lba[8];
+	unsigned char alternate_lba[8];
+	unsigned char first_usable_lba[8];
+	unsigned char last_usable_lba[8];
+	efi_guid_t disk_guid;
+	unsigned char partition_entry_lba[8];
+	unsigned char num_partition_entries[4];
+	unsigned char sizeof_partition_entry[4];
+	unsigned char partition_entry_array_crc32[4];
+	unsigned char reserved2[GPT_BLOCK_SIZE - 92];
+} __attribute__ ((packed)) gpt_header;
+
+typedef struct _gpt_entry_attributes {
+	unsigned long long required_to_function:1;
+	unsigned long long reserved:47;
+	unsigned long long type_guid_specific:16;
+} __attribute__ ((packed)) gpt_entry_attributes;
+
+typedef struct _gpt_entry {
+	efi_guid_t partition_type_guid;
+	efi_guid_t unique_partition_guid;
+	unsigned char starting_lba[8];
+	unsigned char ending_lba[8];
+	gpt_entry_attributes attributes;
+	efi_char16_t partition_name[72 / sizeof(efi_char16_t)];
+}
+__attribute__ ((packed)) gpt_entry;
+
+typedef struct _legacy_mbr {
+	unsigned char boot_code[440];
+	unsigned char unique_mbr_signature[4];
+	unsigned char unknown[2];
+	struct partition partition_record[4];
+	unsigned char signature[2];
+} __attribute__ ((packed)) legacy_mbr;
+
+#endif				/* _DISK_PART_EFI_H */