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
  56 typedef 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
  79 typedef 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
  85 typedef 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
  94 typedef 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
 108 typedef 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 */
 117 extern int efi_partition(struct parsed_partitions *state);
 118
 119 #endif