typedef struct _VF_BTS_DATA_MANAGEMENT_AREA
{
     PVOID BTSBufferBase;
     PVOID BTSIndex;
     PVOID BTSMax;
     PVOID BTSInterruptThreshold;
     PVOID PEBSBufferBase;
     PVOID PEBSIndex;
     PVOID PEBSMax;
     PVOID PEBSInterruptThreshold;
     VOID * PEBSCounterReset[2];
     CHAR Reserved[12];
} VF_BTS_DATA_MANAGEMENT_AREA, *PVF_BTS_DATA_MANAGEMENT_AREA;

Windows Vista Kernel Structures