KiUpdateTimeAssist

VOID __stdcall KiUpdateTimeAssist(UINT64 *InputQpcTicks, UINT64 *NewInterruptTime, UINT64 *CurrentTick){
  LARGE_INTEGER *v5; 
  LARGE_INTEGER PerformanceCounter; 
  unsigned __int128 v7; 
  unsigned __int64 v8; 
  __int64 v9; 
  unsigned __int64 v10; 
  unsigned __int64 v11; 
  volatile unsigned __int64 TickCountQuad; 
  __int64 v13; 
  volatile CCHAR v14; 
  RtlWriteAcquireTickLock((INT64 *)&KUSER_SHARED_DATA.TimeUpdateLock);
  if( v5 )
    PerformanceCounter = *v5;
  else
    PerformanceCounter = KeQueryPerformanceCounter(0i64);
  v7 = KiComputeNewSystemTime(PerformanceCounter.QuadPart);
  v9 = v7;
  v10 = 1i64;
  if( v8 > KUSER_SHARED_DATA.BaselineInterruptTimeQpc )
  {
    v11 = v8 - KUSER_SHARED_DATA.BaselineInterruptTimeQpc;
    if( KUSER_SHARED_DATA.QpcInterruptTimeIncrementShift )
      v11 <<= KUSER_SHARED_DATA.QpcInterruptTimeIncrementShift;
    v7 = v11 * (unsigned __int128)KUSER_SHARED_DATA.QpcInterruptTimeIncrement;
    KiInterruptTimeErrorAccumulator += v7;
    if( KiInterruptTimeErrorAccumulator < (unsigned __int64)v7 )
      ++*((_QWORD *)&v7 + 1);
  }
  *NewInterruptTime = *(_QWORD *)&KUSER_SHARED_DATA.InterruptTime.LowPart + *((_QWORD *)&v7 + 1);
  KUSER_SHARED_DATA.SystemTime.High2Time = HIDWORD(v9);
  *(_QWORD *)&KUSER_SHARED_DATA.SystemTime.LowPart = v9;
  KUSER_SHARED_DATA.InterruptTime.High2Time = *((_DWORD *)NewInterruptTime + 1);
  *(_QWORD *)&KUSER_SHARED_DATA.InterruptTime.LowPart = *NewInterruptTime;
  KUSER_SHARED_DATA.BaselineSystemTimeQpc = v8;
  KUSER_SHARED_DATA.BaselineInterruptTimeQpc = v8;
  TickCountQuad = KUSER_SHARED_DATA.TickCountQuad;
  v13 = (unsigned int)KiTickOffset - *((_QWORD *)&v7 + 1);
  *CurrentTick = KUSER_SHARED_DATA.TickCountQuad;
  if( v13 <= 0 )
  {
    v13 += KeMaximumIncrement;
    if( v13 <= 0 )
    {
      v14 = KeNumberProcessorsGroup0[2];
      v10 = ((unsigned __int64)(((unsigned __int64)-v13
                               * (unsigned __int128)(unsigned __int64)KiMaximumIncrementReciprocal) >> 64) >> v14)
          + 2;
      LODWORD(v13) = (((unsigned __int64)(((unsigned __int64)-v13
                                         * (unsigned __int128)(unsigned __int64)KiMaximumIncrementReciprocal) >> 64) >> v14)
                    + 1)
                   * KeMaximumIncrement
                   + v13;
    }
    *CurrentTick = TickCountQuad + v10;
    KUSER_SHARED_DATA.TickCount.High2Time = *((_DWORD *)CurrentTick + 1);
    KUSER_SHARED_DATA.TickCountQuad = *CurrentTick;
  }
  ++KUSER_SHARED_DATA.TimeUpdateLock;
  KiTickOffset = v13;
}

Referenced by: