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//0x20 bytes (sizeof)
struct _MMCLONE_BLOCK
{
    struct _MMPTE ProtoPte;                                                 //0x0
    ULONGLONG CrossPartitionReferences;                                     //0x8
    union
    {
        volatile LONGLONG EntireField;                                      //0x10
        struct _MI_CLONE_BLOCK_FLAGS Flags;                                 //0x10
    } u1;                                                                   //0x10
    ULONGLONG UseCount;                                                     //0x18
};