HalpTimerMeasureFrequencies

NTSTATUS __fastcall HalpTimerMeasureFrequencies(_KDPC *Dpc, VOID *a2, VOID *a3, VOID *a4){
  unsigned __int64 v4; 
  INT64 *v5; 
  int v6; 
  INT64 v8; 
  void *v9; 
  void *v10; 
  void *v11; 
  INT64 *v12; 
  INT64 *v13; 
  void *v14; 
  void *v15; 
  void *v16; 
  INT64 *v17; 
  INT64 *v18; 
  __int64 v19; 
  void *v20; 
  void *v21; 
  VOID *v22; 
  UINT64 v23; 
  void *v24; 
  void *v25; 
  void *v26; 
  INT64 *v27; 
  INT64 *v28; 
  __int64 v29; 
  INT64 *v30; 
  INT64 *v31; 
  int v32; 
  unsigned __int64 v33; 
  unsigned __int64 v34; 
  void *v35; 
  char *v36; 
  unsigned int v37; 
  void *v38; 
  __int64 v39; 
  __int64(__fastcall *v40)(__int64); 
  __int64 v41; 
  __int64 v42; 
  __int64 v43; 
  __int64 v44; 
  __int64 v45; 
  __int64 v46; 
  __int64 v47; 
  void *retaddr; 

  v4 = (unsigned __int64)&retaddr;
  v5 = (INT64 *)HalpRegisteredTimers;
  v6 = (__int64)Dpc[3].DeferredContext & 2;
  LOBYTE(a2) = 0;
  if( (INT64 *)HalpRegisteredTimers != &HalpRegisteredTimers )
  {
    do
    {
      v8 = (INT64)v5;
      v5 = (INT64 *)*v5;
      if( *(_QWORD *)(v8 + 192) )
      {
        LODWORD(v4) = *(_DWORD *)(v8 + 184);
        if( (v4 & 8) == 0 )
          continue;
      }
      LODWORD(v4) = *(_DWORD *)(v8 + 224);
      if( (v4 & 2) != 0 )
      {
        LODWORD(v4) = HalpTimerInitialize(v8, a2, a3, a4);
        LOBYTE(a2) = 1;
      }
    }
    while( v5 != &HalpRegisteredTimers );
    if( (_BYTE)a2 )
    {
      KeStallExecutionProcessor(0x5DCu);
      v12 = (INT64 *)HalpRegisteredTimers;
      while( v12 != &HalpRegisteredTimers )
      {
        v13 = v12;
        v12 = (INT64 *)*v12;
        if( (!v13[24] || (v13[23] & 8) != 0) && (v13[28] & 2) != 0 && (v13[23] & 2) != 0 )
        {
          if( v6 )
          {
            *((_DWORD *)v13 + 12) = HalpTimerDetermineValidTimerPairReadLatency((_KDPC *)v13, Dpc);
          }
          else
          {
            HalpTimerGetInternalData((_KDPC *)v13, v9, v10, v11);
            v13[2] = ((__int64(__fastcall *)(__int64))v13[14])(v41);
          }
        }
      }
      HalpProcessorFence();
      if( ((__int64)Dpc[3].DeferredContext & 2) == 0 )
      {
        HalpTimerGetInternalData(Dpc, v14, v15, v16);
        ((void(__fastcall *)(__int64, _QWORD))Dpc[2].SystemArgument2)(v42, 0i64);
      }
      v17 = (INT64 *)HalpRegisteredTimers;
      while( v17 != &HalpRegisteredTimers )
      {
        v18 = v17;
        v19 = (__int64)v17;
        v17 = (INT64 *)*v17;
        if( (!v18[24] || (v18[23] & 8) != 0) && (*(_DWORD *)(v19 + 224) & 2) != 0 && (*(_DWORD *)(v19 + 184) & 2) != 0 )
        {
          if( v6 )
          {
            HalpTimerReadTimerPairWithLatencyLimit(
              *(_DWORD *)(v19 + 48),
              v19,
              (__int64)Dpc,
              (UINT64 *)v18 + 2,
              (UINT64 *)(v19 + 24));
          }
          else
          {
            HalpTimerGetInternalData((_KDPC *)v19, v14, v15, v16);
            v18[2] = (*(__int64(__fastcall **)(__int64))(v43 + 112))(v44);
          }
        }
      }
      HalpProcessorFence();
      if( ((__int64)Dpc[3].DeferredContext & 2) != 0 )
      {
        v23 = 1250000i64;
        HalpTimerStallExecutionProcessor(Dpc, (VOID *)0x1312D0, 0i64, v22);
      }
      else
      {
        HalpTimerGetInternalData(Dpc, v20, v21, v22);
        v23 = ((__int64(__fastcall *)(__int64, __int64))Dpc[2].SystemArgument2)(v45, 1250000i64);
      }
      LODWORD(v4) = HalpProcessorFence();
      v27 = (INT64 *)HalpRegisteredTimers;
      while( v27 != &HalpRegisteredTimers )
      {
        v28 = v27;
        v29 = (__int64)v27;
        v27 = (INT64 *)*v27;
        if( v28[24] )
        {
          LODWORD(v4) = *((_DWORD *)v28 + 46);
          if( (v4 & 8) == 0 )
            continue;
        }
        LODWORD(v4) = *(_DWORD *)(v29 + 224);
        if( (v4 & 2) != 0 )
        {
          LODWORD(v4) = *(_DWORD *)(v29 + 184);
          if( (v4 & 2) != 0 )
          {
            if( v6 )
            {
              LODWORD(v4) = HalpTimerReadTimerPairWithLatencyLimit(
                              *(_DWORD *)(v29 + 48),
                              v29,
                              (__int64)Dpc,
                              (UINT64 *)v28 + 4,
                              (UINT64 *)(v29 + 40));
            }
            else
            {
              HalpTimerGetInternalData((_KDPC *)v29, v24, v25, v26);
              v4 = (*(__int64(__fastcall **)(__int64))(v46 + 112))(v47);
              v28[4] = v4;
            }
          }
        }
      }
      v30 = (INT64 *)HalpRegisteredTimers;
      while( v30 != &HalpRegisteredTimers )
      {
        v31 = v30;
        v30 = (INT64 *)*v30;
        if( v31[24] )
        {
          LODWORD(v4) = *((_DWORD *)v31 + 46);
          if( (v4 & 8) == 0 )
            continue;
        }
        LODWORD(v4) = *((_DWORD *)v31 + 56);
        if( (v4 & 2) != 0 )
        {
          v32 = *((_DWORD *)v31 + 46);
          if( (v32 & 2) != 0 )
          {
            v33 = v31[2];
            v34 = v31[4] - v33;
            v35 = (void *)v31[3];
            v36 = (char *)(v31[5] - (_QWORD)v35);
            if( v31[4] < v33 )
              v34 += 1i64 << *((_DWORD *)v31 + 55);
            if( v31[5] < (unsigned __int64)v35 )
              v36 += 1i64 << HIDWORD(Dpc[3].DeferredRoutine);
            if( v6 )
              v23 = HalpTimerScaleCounter((UINT64)v36, *(_QWORD *)&Dpc[3].TargetInfoAsUlong, 0x989680ui64);
            v37 = v32 & 0xFFFFFFF7;
            v4 = 10000000 * v34 / v23;
            *((_DWORD *)v31 + 46) = v37;
            v31[24] = v4;
            if( v31 != (INT64 *)Dpc && (v37 & 4) == 0 )
            {
              v38 = (void *)v31[17];
              if( v38 )
              {
                HalpTimerGetInternalData((_KDPC *)v31, v38, v35, v36);
                LODWORD(v4) = v40(v39);
              }
            }
          }
        }
      }
    }
  }
  return v4;
}

Referenced by: