struct _RSDP// Size=0x24
{
    unsigned long long Signature;// Offset=0x0 Size=0x8
    unsigned char Checksum;// Offset=0x8 Size=0x1
    unsigned char OEMID[6];// Offset=0x9 Size=0x6
    unsigned char Revision;// Offset=0xf Size=0x1
    unsigned long RsdtAddress;// Offset=0x10 Size=0x4
    unsigned long Length;// Offset=0x14 Size=0x4
    union _LARGE_INTEGER XsdtAddress;// Offset=0x18 Size=0x8
    unsigned char XChecksum;// Offset=0x20 Size=0x1
    unsigned char Reserved[3];// Offset=0x21 Size=0x3
};