struct _IOAPIC// Size=0xc
{
    unsigned char Type;// Offset=0x0 Size=0x1
    unsigned char Length;// Offset=0x1 Size=0x1
    unsigned char IOAPICID;// Offset=0x2 Size=0x1
    unsigned char Reserved;// Offset=0x3 Size=0x1
    unsigned long IOAPICAddress;// Offset=0x4 Size=0x4
    unsigned long SystemVectorBase;// Offset=0x8 Size=0x4
};