block/partitions/efi.h

   1 /************************************************************
   2  * EFI GUID Partition Table
   3  * Per Intel EFI Specification v1.02
   4  * http://developer.intel.com/technology/efi/efi.htm
   5  *
   6  * By Matt Domsch <Matt_Domsch@dell.com>  Fri Sep 22 22:15:56 CDT 2000
   7  *   Copyright 2000,2001 Dell Inc.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  ************************************************************/
  24
  25 #ifndef FS_PART_EFI_H_INCLUDED
  26 #define FS_PART_EFI_H_INCLUDED
  27
  28 #include <linux/types.h>
  29 #include <linux/fs.h>
  30 #include <linux/genhd.h>
  31 #include <linux/kernel.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/efi.h>
  35
  36 #define MSDOS_MBR_SIGNATURE 0xaa55
  37 #define EFI_PMBR_OSTYPE_EFI 0xEF
  38 #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
  39
  40 #define GPT_MBR_PROTECTIVE  1
  41 #define GPT_MBR_HYBRID      2
  42
  43 #define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
  44 #define GPT_HEADER_REVISION_V1 0x00010000
  45 #define GPT_PRIMARY_PARTITION_TABLE_LBA 1
  46
  47 #define PARTITION_SYSTEM_GUID \
  48     EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
  49               0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
  50 #define LEGACY_MBR_PARTITION_GUID \
  51     EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
  52               0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
  53 #define PARTITION_MSFT_RESERVED_GUID \
  54     EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
  55               0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
  56 #define PARTITION_BASIC_DATA_GUID \
  57     EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
  58               0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
  59 #define PARTITION_LINUX_RAID_GUID \
  60     EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
  61               0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
  62 #define PARTITION_LINUX_SWAP_GUID \
  63     EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
  64               0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
  65 #define PARTITION_LINUX_LVM_GUID \
  66     EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
  67               0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
  68
  69 typedef struct _gpt_header {
  70         __le64 signature;
  71         __le32 revision;
  72         __le32 header_size;
  73         __le32 header_crc32;
  74         __le32 reserved1;
  75         __le64 my_lba;
  76         __le64 alternate_lba;
  77         __le64 first_usable_lba;
  78         __le64 last_usable_lba;
  79         efi_guid_t disk_guid;
  80         __le64 partition_entry_lba;
  81         __le32 num_partition_entries;
  82         __le32 sizeof_partition_entry;
  83         __le32 partition_entry_array_crc32;
  84
  85         /* The rest of the logical block is reserved by UEFI and must be zero.
  86          * EFI standard handles this by:
  87          *
  88          * uint8_t              reserved2[ BlockSize - 92 ];
  89          */
  90 } __attribute__ ((packed)) gpt_header;
  91
  92 typedef struct _gpt_entry_attributes {
  93         u64 required_to_function:1;
  94         u64 reserved:47;
  95         u64 type_guid_specific:16;
  96 } __attribute__ ((packed)) gpt_entry_attributes;
  97
  98 typedef struct _gpt_entry {
  99         efi_guid_t partition_type_guid;
 100         efi_guid_t unique_partition_guid;
 101         __le64 starting_lba;
 102         __le64 ending_lba;
 103         gpt_entry_attributes attributes;
 104         efi_char16_t partition_name[72 / sizeof (efi_char16_t)];
 105 } __attribute__ ((packed)) gpt_entry;
 106
 107 typedef struct _gpt_mbr_record {
 108         u8      boot_indicator; /* unused by EFI, set to 0x80 for bootable */
 109         u8      start_head;     /* unused by EFI, pt start in CHS */
 110         u8      start_sector;   /* unused by EFI, pt start in CHS */
 111         u8      start_track;
 112         u8      os_type;        /* EFI and legacy non-EFI OS types */
 113         u8      end_head;       /* unused by EFI, pt end in CHS */
 114         u8      end_sector;     /* unused by EFI, pt end in CHS */
 115         u8      end_track;      /* unused by EFI, pt end in CHS */
 116         __le32  starting_lba;   /* used by EFI - start addr of the on disk pt */
 117         __le32  size_in_lba;    /* used by EFI - size of pt in LBA */
 118 } __packed gpt_mbr_record;
 119
 120
 121 typedef struct _legacy_mbr {
 122         u8 boot_code[440];
 123         __le32 unique_mbr_signature;
 124         __le16 unknown;
 125         gpt_mbr_record partition_record[4];
 126         __le16 signature;
 127 } __attribute__ ((packed)) legacy_mbr;
 128
 129 /* Functions */
 130 extern int efi_partition(struct parsed_partitions *state);
 131
 132 #endif