1 /** @file
2   Legacy Master Boot Record Format Definition.
3 
4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
6 
7 **/
8 
9 #ifndef _MBR_H_
10 #define _MBR_H_
11 
12 #define MBR_SIGNATURE               0xaa55
13 
14 #define EXTENDED_DOS_PARTITION      0x05
15 #define EXTENDED_WINDOWS_PARTITION  0x0F
16 
17 #define MAX_MBR_PARTITIONS          4
18 
19 #define PMBR_GPT_PARTITION          0xEE
20 #define EFI_PARTITION               0xEF
21 
22 #define MBR_SIZE                    512
23 
24 #pragma pack(1)
25 ///
26 /// MBR Partition Entry
27 ///
28 typedef struct {
29   UINT8 BootIndicator;
30   UINT8 StartHead;
31   UINT8 StartSector;
32   UINT8 StartTrack;
33   UINT8 OSIndicator;
34   UINT8 EndHead;
35   UINT8 EndSector;
36   UINT8 EndTrack;
37   UINT8 StartingLBA[4];
38   UINT8 SizeInLBA[4];
39 } MBR_PARTITION_RECORD;
40 
41 ///
42 /// MBR Partition Table
43 ///
44 typedef struct {
45   UINT8                 BootStrapCode[440];
46   UINT8                 UniqueMbrSignature[4];
47   UINT8                 Unknown[2];
48   MBR_PARTITION_RECORD  Partition[MAX_MBR_PARTITIONS];
49   UINT16                Signature;
50 } MASTER_BOOT_RECORD;
51 
52 #pragma pack()
53 
54 #endif
55