source: bootcd/isolinux/syslinux-6.03/efi32/include/efi/efipart.h

#ifndef _EFI_PART_H
#define _EFI_PART_H

/*++

Copyright (c) 1998  Intel Corporation

Module Name:

    efipart.h
    
Abstract:   
    Info about disk partitions and Master Boot Records




Revision History

--*/

//
//
//

#define EFI_PARTITION   0xef
#define MBR_SIZE        512

#pragma pack(1)

typedef struct {
    UINT8       BootIndicator;
    UINT8       StartHead;
    UINT8       StartSector;
    UINT8       StartTrack;
    UINT8       OSIndicator;
    UINT8       EndHead;
    UINT8       EndSector;
    UINT8       EndTrack;
    UINT8       StartingLBA[4];
    UINT8       SizeInLBA[4];
} MBR_PARTITION_RECORD;

#define EXTRACT_UINT32(D) (UINT32)(D[0] | (D[1] << 8) | (D[2] << 16) | (D[3] << 24))

#define MBR_SIGNATURE           0xaa55
#define MIN_MBR_DEVICE_SIZE     0x80000
#define MBR_ERRATA_PAD          0x40000 // 128 MB

#define MAX_MBR_PARTITIONS  4   
typedef struct {
    UINT8                   BootStrapCode[440];
    UINT8                   UniqueMbrSignature[4];
    UINT8                   Unknown[2];
    MBR_PARTITION_RECORD    Partition[MAX_MBR_PARTITIONS];
    UINT16                  Signature;
} MASTER_BOOT_RECORD;
#pragma pack()


#endif