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//0x20 bytes (sizeof)
struct _KDPC
{
    union
    {
        ULONG TargetInfoAsUlong;                                            //0x0
        struct
        {
            UCHAR Type;                                                     //0x0
            UCHAR Importance;                                               //0x1
            volatile USHORT Number;                                         //0x2
        };
    };
    struct _SINGLE_LIST_ENTRY DpcListEntry;                                 //0x4
    ULONG ProcessorHistory;                                                 //0x8
    VOID (*DeferredRoutine)(struct _KDPC* arg1, VOID* arg2, VOID* arg3, VOID* arg4); //0xc
    VOID* DeferredContext;                                                  //0x10
    VOID* SystemArgument1;                                                  //0x14
    VOID* SystemArgument2;                                                  //0x18
    VOID* DpcData;                                                          //0x1c
};