KiCheckForTimerExpiration

VOID __stdcall KiCheckForTimerExpiration(_KPRCB *Prcb){
  __int64 v1; 
  INT64 v2; 
  char v3; 
  char *v4; 
  _KPRCB *v6; 
  char *v7; 
  unsigned __int8 v8; 
  __int64 v9; 
  __int64 v10; 
  int v11; 
  _DWORD *v12; 
  int v13; 
  unsigned int v14; 
  unsigned int v15; 
  unsigned __int64 v16; 
  UINT64 v17; 
  char *v18; 
  UINT64 v19; 
  unsigned __int8 CurrentIrql; 
  unsigned int ClockIntervalOneShot; 
  INT64 v22; 
  unsigned __int64 v23; 
  __int16 v24; 
  __int16 v25; 
  INT64 Flag; 
  INT64 v27; 
  INT64 v28; 
  __int128 v29; 
  EVENT_DATA_DESCRIPTOR EventData; 
  v29 = 0i64;
  v3 = 0;
  v4 = *(char **)&KUSER_SHARED_DATA.InterruptTime.LowPart;
  if( (*((_BYTE *)Prcb + 12588) & 8) == 0 )
  {
    if( KiSerializeTimerExpiration )
    {
      if( !*((_BYTE *)Prcb + 33) )
        goto LABEL_4;
      v6 = KiProcessorBlock;
    }
    else
    {
      v6 = Prcb;
    }
    v7 = (char *)v6 + 14656;
    if( v6 != (_KPRCB *)-14656i64 )
    {
      v8 = *((_QWORD *)v6 + 3944) != KiLastPseudoHrTimerExpiration;
      v1 = v8;
      if( (KiVelocityFlags & 0x2000) != 0 )
        v1 = *((_QWORD *)v6 + 3945) != (_QWORD)KiLastNonHrTimerExpiration;
      LOBYTE(v28) = *((_QWORD *)v6 + 3944) != KiLastPseudoHrTimerExpiration;
      if( (_BYTE)v1 || v8 )
      {
        LODWORD(v2) = 0;
        v9 = *(_QWORD *)&KUSER_SHARED_DATA.InterruptTime.LowPart >> 18;
        v10 = 0i64;
        v11 = -1;
        v12 = (_DWORD *)((char *)v6 + 31568);
        while( 1 )
        {
          v13 = *v12 + 255;
          if( (unsigned int)(v9 - *v12) < 0x100 )
            v13 = v9;
          v14 = *v12 - 1;
          while( 1 )
          {
            ++v14;
            v15 = v11;
            v16 = *(_QWORD *)&v7[32 * v10 + 536 + 32 * (unsigned __int8)v14];
            if( (_DWORD)v2 != 1 || (_BYTE)v1 )
              break;
            if( (unsigned __int64)v4 >= v16 )
            {
              v11 = v14;
              if( v15 < v14 )
                v11 = v15;
              if( (unsigned __int64)&v4[KePseudoHrTimeIncrement] > (unsigned int)KeNonHrTimeIncrement + v16 )
              {
                v3 = 1;
                KiLastNonHrTimerExpiration = v4;
                v1 = 1i64;
                v14 = v11;
                goto LABEL_22;
              }
            }
LABEL_19:
            if( v14 == v13 )
              goto LABEL_20;
          }
          if( (unsigned __int64)v4 < v16 )
            goto LABEL_19;
          v3 = 1;
LABEL_20:
          if( !(_DWORD)v2 || (_BYTE)v1 )
LABEL_22:
            *(_DWORD *)&v7[4 * (unsigned int)v2 + 16912] = v14;
          v2 = (unsigned int)(v2 + 1);
          ++v12;
          v10 += 256i64;
          LODWORD(v9) = v13;
          if( (unsigned int)v2 >= 2 )
          {
            v8 = v28;
            break;
          }
        }
      }
      if( !*((_BYTE *)Prcb + 33) )
        goto LABEL_5;
      if( !(_BYTE)v1
        && v8
        && (unsigned __int64)v4 >= qword_140C31A98
        && (unsigned __int64)&v4[KePseudoHrTimeIncrement] > (unsigned __int64)(unsigned int)KeNonHrTimeIncrement
                                                          + qword_140C31A98 )
      {
        KiLastNonHrTimerExpiration = v4;
LABEL_59:
        v3 = 1;
        goto LABEL_4;
      }
      if( v3 )
        goto LABEL_4;
      if( (_BYTE)v1 )
      {
        if( KiNextTimer2DueTime <= (unsigned __int64)v4 )
          v3 = 1;
      }
      else if( v8 && qword_140C31A80 <= (unsigned __int64)v4 || DueTime <= (unsigned __int64)v4 )
      {
        goto LABEL_59;
      }
    }
  }
LABEL_4:
  if( !*((_BYTE *)Prcb + 33) )
    goto LABEL_5;
  v17 = DueTime;
  v18 = &v4[KeMaximumIncrement];
  if( DueTime > (unsigned __int64)v4 )
  {
    v19 = KiClockOwnerOneShotRequest;
    if( !KiClockOwnerOneShotRequest )
      v19 = -1i64;
    if( v19 != DueTime )
    {
      CurrentIrql = KeGetCurrentIrql();
      __writecr8(0xFui64);
      if( (unsigned __int64)v18 <= v17 )
      {
        if( KiClockOwnerOneShotRequest )
        {
          PoTraceSystemTimerResolutionKernel(0i64, 0x534F5248ui64);
          KiClockOwnerOneShotRequest = 0i64;
          KiSetClockIntervalToMinimumRequested();
        }
      }
      else
      {
        KiClockOwnerOneShotRequest = v17;
        KiSetClockIntervalToMinimumRequested();
        ClockIntervalOneShot = KiGetClockIntervalOneShot(v17, (INT64)v4);
        PoTraceSystemTimerResolutionKernel(ClockIntervalOneShot, 0x534F5248ui64);
      }
      __writecr8(CurrentIrql);
    }
LABEL_5:
    if( !v3 )
      return;
  }
  HIDWORD(v28) = 0;
  _m_prefetchw((char *)Prcb + 12588);
  v22 = *((unsigned __int16 *)Prcb + 6294);
  v23 = (unsigned __int16)v22;
  BYTE1(v23) = HIBYTE(*((_WORD *)Prcb + 6294));
  v24 = *((_WORD *)Prcb + 6294);
  if( v24 != _InterlockedCompareExchange16((volatile signed __int16 *)Prcb + 6294, v22 | 8, v22) )
  {
    do
    {
      RtlBackoff((UINT64 *)((char *)&v28 + 4));
      _m_prefetchw((char *)Prcb + 12588);
      v22 = *((unsigned __int16 *)Prcb + 6294);
      v23 = (unsigned __int16)v22;
      BYTE1(v23) = HIBYTE(*((_WORD *)Prcb + 6294));
      v25 = *((_WORD *)Prcb + 6294);
    }
    while( v25 != _InterlockedCompareExchange16((volatile signed __int16 *)Prcb + 6294, v22 | 8, v22) );
  }
  if( (v22 & 0x29) == 0 )
  {
    if( *((_BYTE *)Prcb + 32) )
    {
      *((_BYTE *)Prcb + 6) = 1;
    }
    else
    {
      LOBYTE(v23) = 2;
      HalRequestSoftwareInterrupt(
        (VOID *)v23,
        v22,
        (INT64 *)v1,
        v2,
        Flag,
        v27,
        v28,
        v29,
        *((INT64 *)&v29 + 1),
        EventData.Ptr,
        *(INT64 *)&EventData.Size);
    }
  }
}

Referenced by: