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1 /*
2  * Copyright (C) 2008 RuggedCom, Inc.
3  * Richard Retanubun <RichardRetanubun@RuggedCom.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 /*
9  * See also linux/fs/partitions/efi.h
10  *
11  * EFI GUID Partition Table
12  * Per Intel EFI Specification v1.02
13  * http://developer.intel.com/technology/efi/efi.htm
14 */
15
16 #include <linux/compiler.h>
17
18 #ifndef _DISK_PART_EFI_H
19 #define _DISK_PART_EFI_H
20
21 #define MSDOS_MBR_SIGNATURE 0xAA55
22 #define EFI_PMBR_OSTYPE_EFI 0xEF
23 #define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
24
25 #define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
26 #define GPT_HEADER_REVISION_V1 0x00010000
27 #define GPT_PRIMARY_PARTITION_TABLE_LBA 1ULL
28 #define GPT_ENTRY_NAME "gpt"
29 #define GPT_ENTRY_NUMBERS               128
30 #define GPT_ENTRY_SIZE                  128
31
32 #define EFI_GUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
33         ((efi_guid_t) \
34         {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
35                 (b) & 0xff, ((b) >> 8) & 0xff, \
36                 (c) & 0xff, ((c) >> 8) & 0xff, \
37                 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
38
39 #define PARTITION_SYSTEM_GUID \
40         EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
41                 0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
42 #define LEGACY_MBR_PARTITION_GUID \
43         EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
44                 0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
45 #define PARTITION_MSFT_RESERVED_GUID \
46         EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
47                 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
48 #define PARTITION_BASIC_DATA_GUID \
49         EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
50                 0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
51 #define PARTITION_LINUX_RAID_GUID \
52         EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
53                 0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
54 #define PARTITION_LINUX_SWAP_GUID \
55         EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
56                 0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
57 #define PARTITION_LINUX_LVM_GUID \
58         EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
59                 0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
60
61 /* linux/include/efi.h */
62 typedef u16 efi_char16_t;
63
64 typedef struct {
65         u8 b[16];
66 } efi_guid_t;
67
68 /* based on linux/include/genhd.h */
69 struct partition {
70         u8 boot_ind;            /* 0x80 - active */
71         u8 head;                /* starting head */
72         u8 sector;              /* starting sector */
73         u8 cyl;                 /* starting cylinder */
74         u8 sys_ind;             /* What partition type */
75         u8 end_head;            /* end head */
76         u8 end_sector;          /* end sector */
77         u8 end_cyl;             /* end cylinder */
78         __le32 start_sect;      /* starting sector counting from 0 */
79         __le32 nr_sects;        /* nr of sectors in partition */
80 } __packed;
81
82 /* based on linux/fs/partitions/efi.h */
83 typedef struct _gpt_header {
84         __le64 signature;
85         __le32 revision;
86         __le32 header_size;
87         __le32 header_crc32;
88         __le32 reserved1;
89         __le64 my_lba;
90         __le64 alternate_lba;
91         __le64 first_usable_lba;
92         __le64 last_usable_lba;
93         efi_guid_t disk_guid;
94         __le64 partition_entry_lba;
95         __le32 num_partition_entries;
96         __le32 sizeof_partition_entry;
97         __le32 partition_entry_array_crc32;
98 } __packed gpt_header;
99
100 typedef union _gpt_entry_attributes {
101         struct {
102                 u64 required_to_function:1;
103                 u64 no_block_io_protocol:1;
104                 u64 legacy_bios_bootable:1;
105                 u64 reserved:45;
106                 u64 type_guid_specific:16;
107         } fields;
108         unsigned long long raw;
109 } __packed gpt_entry_attributes;
110
111 #define PARTNAME_SZ     (72 / sizeof(efi_char16_t))
112 typedef struct _gpt_entry {
113         efi_guid_t partition_type_guid;
114         efi_guid_t unique_partition_guid;
115         __le64 starting_lba;
116         __le64 ending_lba;
117         gpt_entry_attributes attributes;
118         efi_char16_t partition_name[PARTNAME_SZ];
119 } __packed gpt_entry;
120
121 typedef struct _legacy_mbr {
122         u8 boot_code[440];
123         __le32 unique_mbr_signature;
124         __le16 unknown;
125         struct partition partition_record[4];
126         __le16 signature;
127 } __packed legacy_mbr;
128
129 #endif  /* _DISK_PART_EFI_H */