typedef struct _DBGKD_GET_INTERNAL_BREAKPOINT64
{
     UINT64 BreakpointAddress;
     ULONG Flags;
     ULONG Calls;
     ULONG MaxCallsPerPeriod;
     ULONG MinInstructions;
     ULONG MaxInstructions;
     ULONG TotalInstructions;
} DBGKD_GET_INTERNAL_BREAKPOINT64, *PDBGKD_GET_INTERNAL_BREAKPOINT64;

Windows Vista Kernel Structures