struct MMPTE_TRANSITION

typedef struct _MMPTE_TRANSITION
{
     ULONG Valid: 1;
     ULONG Write: 1;
     ULONG Owner: 1;
     ULONG WriteThrough: 1;
     ULONG CacheDisable: 1;
     ULONG Protection: 5;
     ULONG Prototype: 1;
     ULONG Transition: 1;
     ULONG PageFrameNumber: 26;
     ULONG Unused: 26;
} MMPTE_TRANSITION, *PMMPTE_TRANSITION;

Windows Vista Kernel Structures