typedef struct _MMPTE_PROTOTYPE
{
    unsigned __int64 Valid : 1;
    unsigned __int64 Unused0 : 7;
    unsigned __int64 ReadOnly : 1;
    unsigned __int64 Unused1 : 1;
    unsigned __int64 Prototype : 1;
    unsigned __int64 Protection : 5;
    __int64 ProtoAddress : 48;
} MMPTE_PROTOTYPE, *PMMPTE_PROTOTYPE;