/* Root system description pointer structure */
struct rsdp
{
    uint64_t signature;
    uint8_t checksum;
    char oemid[6];
    uint8_t revision;
    uint32_t rsdt_address;
} __attribute__ ((packed));

/* Extended root system description pointer */
struct rsdp_ext
{
    struct rsdp rsdp;
    uint32_t length;
    uint64_t xsdt_address;
    uint8_t checksum;
    uint8_t reserved[3];
} __attribute__ ((packed));