Function GetTiming

Library/OcDebugLogLib/OcLog.c:40–97

#include "OcLogInternal.h"

STATIC
CHAR8 *
GetTiming  (
  IN OC_LOG_PROTOCOL  *This
  )
{
  OC_LOG_PRIVATE_DATA *Private = NULL;

  UINT64                dTStartSec = 0;
  UINT64                dTStartMs = 0;
  UINT64                dTLastSec = 0;
  UINT64                dTLastMs = 0;
  UINT64                CurrentTsc = 0;

  if (This == NULL) {
    return NULL;
  }

  Private = OC_LOG_PRIVATE_DATA_FROM_OC_LOG_THIS (This);

  //
  // Calibrate TSC for timings.
  //

  if (Private->TscFrequency == 0)  {
    Private->TscFrequency = OcGetTSCFrequency ();

    if (Private->TscFrequency != 0) {
      CurrentTsc = AsmReadTsc ();

      Private->TscStart = CurrentTsc;
      Private->TscLast  = CurrentTsc;
    }
  }

  if (Private->TscFrequency > 0) {
    CurrentTsc = AsmReadTsc ();

    dTStartMs  = DivU64x64Remainder (MultU64x32 (CurrentTsc - Private->TscStart, 1000), Private->TscFrequency, NULL);
    dTStartSec = DivU64x64Remainder (dTStartMs, 1000, &dTStartMs);
    dTLastMs   = DivU64x64Remainder (MultU64x32 (CurrentTsc - Private->TscLast, 1000), Private->TscFrequency, NULL);
    dTLastSec  = DivU64x64Remainder (dTLastMs, 1000, &dTLastMs);

    Private->TscLast = CurrentTsc;
  }

  AsciiSPrint (
    Private->TimingTxt,
    OC_LOG_TIMING_BUFFER_SIZE,
    "%02d:%03d %02d:%03d ",
    dTStartSec,
    dTStartMs,
    dTLastSec,
    dTLastMs
    );

  return Private->TimingTxt;
}