NTSTATUS
KdGetTraceInformation(
      PVOID SystemInformation,
      ULONG SystemInformationLength,
      PULONG ReturnLength
  );

Routine Description:

    This function gets data about an internal breakpoint and returns it
    in a buffer provided for it.  It is designed to be called from
    NTQuerySystemInformation.  It is morally equivalent to GetInternalBP
    except that it communicates locally, and returns all the breakpoints
    at once.

Arguments:

    SystemInforamtion - the buffer into which to write the result.
    SystemInformationLength - the maximum length to write
    RetrunLength - How much data was really written

Return Value:

    None.