#define GUID_TYPE_EMPTY MAKE_GUID(0,0,0,0,0)
#define GUID_TYPE_SYSTEM MAKE_GUID(C12A7328,F81F,11D2,BA4B,00A0C93EC93B)
#define GUID_TYPE_LINUX_EXT3 MAKE_GUID(EBD0A0A2,B9E5,4433,87C0,68B6B72699C7)
#define GUID_TYPE_LINUX_SWAP MAKE_GUID(0657FD6D,A4AB,43C4,84E5,0933C84B4F4F)
#define GUID_TYPE_APPLE_HFS MAKE_GUID(48465300,0000,11AA,AA11,00306543ECAC)

#define GPT_ENTRY_FLAG_SYSTEM 1
typedef struct
{
  GUID type;
  GUID label;
  uint64_t start;
  uint64_t end;
  uint64_t flags;
  uint8_t name[72];
} PACKED GPT_entry;

#define GPT_HEADER_SIGNATURE "EFI PART"
#define GPT_HEADER_REVISION_EFI10 0x00010000

typedef struct
{
  uint8_t signature[8];
  uint32_t revision;
  uint32_t header_size;
  uint32_t header_crc;
  uint8_t reserved[20];
  uint64_t my_lba;
  uint64_t alternate_lba;
  uint64_t first_usable_lba;
  uint64_t last_usable_lba;
  GUID disk_guid;
  uint64_t partition_entry_lba;
  uint32_t n_partition_entries;
  uint32_t partition_entry_size;
  uint32_t partition_entry_crc;
} PACKED GPT_header;




#define MBR_PARTITION_TYPE_EFI 0xee
#define MBR_PARTITION_BOOTABLE 0x80

typedef struct
{
  uint8_t head;
  uint8_t sector;
  uint8_t track;
} PACKED CHS;

typedef struct
{
  uint8_t bootable;
  CHS chs_start;
  uint8_t system;
  CHS chs_end;
  uint32_t start;
  uint32_t size;
} PACKED MBR_entry;

typedef struct
{
  uint8_t boot_code[440];
  uint8_t uid[4];
  uint8_t reserved[2];
  MBR_entry entry[4];
  uint8_t signature[2];
} PACKED MBR;