typedef struct _MMVAD_LONG
{
     ULONG u1;
     PMMVAD LeftChild;
     PMMVAD RightChild;
     ULONG StartingVpn;
     ULONG EndingVpn;
     ULONG u;
     EX_PUSH_LOCK PushLock;
     ULONG u5;
     ULONG u2;
     PSUBSECTION Subsection;
     PMMPTE FirstPrototypePte;
     PMMPTE LastContiguousPte;
     UINT64 u3;
     ULONG u4;
} MMVAD_LONG, *PMMVAD_LONG;

Windows Vista Kernel Structures