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Copyright (C) 2000-2001 Dell Computer Corporation <>
EFI GUID Partition Table handling
Per Intel EFI Specification v1.02
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
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
// For TWRP purposes, we'll be opting for version 3 of the GPL
#ifndef _GPT_H
#define _GPT_H
#include <inttypes.h>
//#include "efi.h"
typedef struct {
uint8_t b[16];
} efi_guid_t;
typedef uint16_t efi_char16_t; /* UNICODE character */
#define MSDOS_MBR_SIGNATURE 0xaa55
#define GPT_BLOCK_SIZE 512
static const char* TWGptAndroidExpand = "193d1ea4b3ca11e4b07510604b889dcf";
#define GPT_HEADER_SIGNATURE ((uint64_t)(0x5452415020494645LL))
#define GPT_HEADER_REVISION_V1_02 0x00010200
#define GPT_HEADER_REVISION_V1_00 0x00010000
#define GPT_HEADER_REVISION_V0_99 0x00009900
EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
typedef struct _gpt_header {
uint64_t signature;
uint32_t revision;
uint32_t header_size;
uint32_t header_crc32;
uint32_t reserved1;
uint64_t my_lba;
uint64_t alternate_lba;
uint64_t first_usable_lba;
uint64_t last_usable_lba;
efi_guid_t disk_guid;
uint64_t partition_entry_lba;
uint32_t num_partition_entries;
uint32_t sizeof_partition_entry;
uint32_t partition_entry_array_crc32;
uint8_t reserved2[GPT_BLOCK_SIZE - 92];
} __attribute__ ((packed)) gpt_header;
typedef struct _gpt_entry_attributes {
uint64_t required_to_function:1;
uint64_t reserved:47;
uint64_t 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;
uint64_t starting_lba;
uint64_t ending_lba;
gpt_entry_attributes attributes;
efi_char16_t partition_name[72 / sizeof(efi_char16_t)];
} __attribute__ ((packed)) gpt_entry;
These values are only defaults. The actual on-disk structures
may define different sizes, so use those unless creating a new GPT disk!
Number of actual partition entries should be calculated
typedef struct _partition_record {
uint8_t boot_indicator; /* Not used by EFI firmware. Set to 0x80 to indicate that this
is the bootable legacy partition. */
uint8_t start_head; /* Start of partition in CHS address, not used by EFI firmware. */
uint8_t start_sector; /* Start of partition in CHS address, not used by EFI firmware. */
uint8_t start_track; /* Start of partition in CHS address, not used by EFI firmware. */
uint8_t os_type; /* OS type. A value of 0xEF defines an EFI system partition.
Other values are reserved for legacy operating systems, and
allocated independently of the EFI specification. */
uint8_t end_head; /* End of partition in CHS address, not used by EFI firmware. */
uint8_t end_sector; /* End of partition in CHS address, not used by EFI firmware. */
uint8_t end_track; /* End of partition in CHS address, not used by EFI firmware. */
uint32_t starting_lba; /* Starting LBA address of the partition on the disk. Used by
EFI firmware to define the start of the partition. */
uint32_t size_in_lba; /* Size of partition in LBA. Used by EFI firmware to determine
the size of the partition. */
} __attribute__ ((packed)) partition_record;
/* Protected Master Boot Record & Legacy MBR share same structure */
/* Needs to be packed because the u16s force misalignment. */
typedef struct _legacy_mbr {
uint8_t bootcode[440];
uint32_t unique_mbr_signature;
uint16_t unknown;
partition_record partition[4];
uint16_t signature;
} __attribute__ ((packed)) legacy_mbr;
/* Functions */
int gpt_disk_get_partition_info (int fd, uint32_t num,
char *type, char *part);
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
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* of the file.
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