copy
//0x10 bytes (sizeof)
union _KIDTENTRY64
{
    struct
    {
        USHORT OffsetLow;                                                   //0x0
        USHORT Selector;                                                    //0x2
    };
    USHORT IstIndex:3;                                                      //0x4
    USHORT Reserved0:5;                                                     //0x4
    USHORT Type:5;                                                          //0x4
    USHORT Dpl:2;                                                           //0x4
    struct
    {
        USHORT Present:1;                                                   //0x4
        USHORT OffsetMiddle;                                                //0x6
    };
    struct
    {
        ULONG OffsetHigh;                                                   //0x8
        ULONG Reserved1;                                                    //0xc
    };
    ULONGLONG Alignment;                                                    //0x0
};