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#define PACKED __attribute__((packed))
#define TYPE_EMPTY "00000000-0000-0000-0000-000000000000"
#define TYPE_SYSTEM "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
typedef PACKED struct
{
uint8_t d[16];
} GUID;
#define GPT_ENTRY_FLAG_SYSTEM 1
typedef PACKED struct
{
GUID type;
GUID label;
uint64_t start;
uint64_t end;
uint64_t flags;
uint8_t name[72];
} GPT_entry;
#define GPT_HEADER_SIGNATURE "EFI PART"
#define GPT_HEADER_REVISION_EFI10 0x00010000
typedef PACKED 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;
} GPT_header;
#define MBR_PARTITION_TYPE_EFI 0xee
#define MBR_PARTITION_BOOTABLE 0x80
typedef PACKED struct
{
uint8_t head;
uint8_t sector;
uint8_t track;
} CHS;
typedef PACKED struct
{
uint8_t bootable;
CHS chs_start;
uint8_t system;
CHS chs_end;
uint32_t start;
uint32_t size;
} MBR_entry;
typedef PACKED struct
{
uint8_t boot_code[440];
uint8_t uid[4];
uint8_t reserved[2];
MBR_entry entry[4];
uint8_t signature[2];
} MBR;
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