LXR linux/block/partitions/efi.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/************************************************************
   3 * EFI GUID Partition Table
   4 * Per Intel EFI Specification v1.02
   5 * http://developer.intel.com/technology/efi/efi.htm
   6 *
   7 * By Matt Domsch <Matt_Domsch@dell.com>  Fri Sep 22 22:15:56 CDT 2000  
   8 *   Copyright 2000,2001 Dell Inc.
   9 ************************************************************/
  10
  11#ifndef FS_PART_EFI_H_INCLUDED
  12#define FS_PART_EFI_H_INCLUDED
  13
  14#include <linux/types.h>
  15#include <linux/fs.h>
  16#include <linux/genhd.h>
  17#include <linux/kernel.h>
  18#include <linux/major.h>
  19#include <linux/string.h>
  20#include <linux/efi.h>
  21#include <linux/compiler.h>
  22
  23#define MSDOS_MBR_SIGNATURE 0xaa55
  24#define EFI_PMBR_OSTYPE_EFI 0xEF
  25#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
  26
  27#define GPT_MBR_PROTECTIVE  1
  28#define GPT_MBR_HYBRID      2
  29
  30#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
  31#define GPT_HEADER_REVISION_V1 0x00010000
  32#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
  33
  34#define PARTITION_SYSTEM_GUID \
  35    EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
  36              0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B) 
  37#define LEGACY_MBR_PARTITION_GUID \
  38    EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
  39              0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
  40#define PARTITION_MSFT_RESERVED_GUID \
  41    EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
  42              0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
  43#define PARTITION_BASIC_DATA_GUID \
  44    EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
  45              0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
  46#define PARTITION_LINUX_RAID_GUID \
  47    EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
  48              0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
  49#define PARTITION_LINUX_SWAP_GUID \
  50    EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
  51              0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
  52#define PARTITION_LINUX_LVM_GUID \
  53    EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
  54              0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
  55
  56typedef struct _gpt_header {
  57        __le64 signature;
  58        __le32 revision;
  59        __le32 header_size;
  60        __le32 header_crc32;
  61        __le32 reserved1;
  62        __le64 my_lba;
  63        __le64 alternate_lba;
  64        __le64 first_usable_lba;
  65        __le64 last_usable_lba;
  66        efi_guid_t disk_guid;
  67        __le64 partition_entry_lba;
  68        __le32 num_partition_entries;
  69        __le32 sizeof_partition_entry;
  70        __le32 partition_entry_array_crc32;
  71
  72        /* The rest of the logical block is reserved by UEFI and must be zero.
  73         * EFI standard handles this by:
  74         *
  75         * uint8_t              reserved2[ BlockSize - 92 ];
  76         */
  77} __packed gpt_header;
  78
  79typedef struct _gpt_entry_attributes {
  80        u64 required_to_function:1;
  81        u64 reserved:47;
  82        u64 type_guid_specific:16;
  83} __packed gpt_entry_attributes;
  84
  85typedef struct _gpt_entry {
  86        efi_guid_t partition_type_guid;
  87        efi_guid_t unique_partition_guid;
  88        __le64 starting_lba;
  89        __le64 ending_lba;
  90        gpt_entry_attributes attributes;
  91        efi_char16_t partition_name[72 / sizeof (efi_char16_t)];
  92} __packed gpt_entry;
  93
  94typedef struct _gpt_mbr_record {
  95        u8      boot_indicator; /* unused by EFI, set to 0x80 for bootable */
  96        u8      start_head;     /* unused by EFI, pt start in CHS */
  97        u8      start_sector;   /* unused by EFI, pt start in CHS */
  98        u8      start_track;
  99        u8      os_type;        /* EFI and legacy non-EFI OS types */
 100        u8      end_head;       /* unused by EFI, pt end in CHS */
 101        u8      end_sector;     /* unused by EFI, pt end in CHS */
 102        u8      end_track;      /* unused by EFI, pt end in CHS */
 103        __le32  starting_lba;   /* used by EFI - start addr of the on disk pt */
 104        __le32  size_in_lba;    /* used by EFI - size of pt in LBA */
 105} __packed gpt_mbr_record;
 106
 107
 108typedef struct _legacy_mbr {
 109        u8 boot_code[440];
 110        __le32 unique_mbr_signature;
 111        __le16 unknown;
 112        gpt_mbr_record partition_record[4];
 113        __le16 signature;
 114} __packed legacy_mbr;
 115
 116/* Functions */
 117extern int efi_partition(struct parsed_partitions *state);
 118
 119#endif
 120