typedef struct _MMPTE_HARDWARE
{
     ULONG Valid: 1;
     ULONG Dirty1: 1;
     ULONG Owner: 1;
     ULONG WriteThrough: 1;
     ULONG CacheDisable: 1;
     ULONG Accessed: 1;
     ULONG Dirty: 1;
     ULONG LargePage: 1;
     ULONG Global: 1;
     ULONG CopyOnWrite: 1;
     ULONG Prototype: 1;
     ULONG Write: 1;
     ULONG PageFrameNumber: 26;
     ULONG reserved1: 26;
} MMPTE_HARDWARE, *PMMPTE_HARDWARE;

Windows Vista Kernel Structures