HalpDmaNextContiguousPieceV3

VOID __fastcall HalpDmaNextContiguousPieceV3(
        _ADAPTER_OBJECT *ChildAdapter,
        _MDL *Mdl,
        _HALP_DMA_TRANSLATION_ENTRY *TranslationBase,
        VOID *CurrentVa,
        UINT8 WriteToDevice,
        UINT64 Length){
  unsigned __int8 DmaCanCross64K; 
  _HALP_DMA_TRANSLATION_ENTRY *v7; 
  unsigned __int64 QuadPart; 
  int v9; 
  unsigned __int64 v10; 
  bool v12; 
  unsigned int v13; 
  unsigned int v14; 
  __int64 v15; 
  unsigned int v16; 
  _MDL **v17; 
  _MDL **v18; 
  unsigned int v19; 
  _MDL **v20; 
  unsigned __int64 v21; 
  _MDL *v22; 
  unsigned int v23; 
  int v24; 
  NTSTATUS AdapterCacheAlignment; 
  unsigned __int64 *v26; 
  unsigned int i; 
  _HALP_DMA_TRANSLATION_ENTRY *NextMapping; 
  unsigned __int64 v29; 
  unsigned __int64 v30; 
  _MDL **v31; 
  unsigned __int8 v32; 
  unsigned int v33; 
  _LARGE_INTEGER MaximumPhysicalAddress; 

  DmaCanCross64K = ChildAdapter->AdapterObject.DmaCanCross64K;
  v7 = TranslationBase;
  v9 = (int)CurrentVa;
  MaximumPhysicalAddress = ChildAdapter->AdapterObject.MaximumPhysicalAddress;
  QuadPart = MaximumPhysicalAddress.QuadPart;
  v10 = (unsigned __int64)MaximumPhysicalAddress.QuadPart >> 12;
  v32 = DmaCanCross64K;
  v12 = !WriteToDevice && !ChildAdapter->CacheCoherent;
  v13 = Length;
  v14 = 4096 - ((unsigned __int16)CurrentVa & 0xFFF);
  v15 = (unsigned int)(((unsigned __int64)CurrentVa - (unsigned __int64)Mdl->StartVa) >> 12) + 6i64;
  v33 = v14;
  v16 = v14;
  v17 = &Mdl->Next + v15;
  v18 = v17;
  v31 = v17;
  if( (unsigned __int64)*v17 > v10 )
    goto LABEL_33;
  if( v12 )
  {
    if( ((HalpDmaGetAdapterCacheAlignment(ChildAdapter) - 1) & v9) == 0 )
    {
      QuadPart = MaximumPhysicalAddress.QuadPart;
      goto LABEL_9;
    }
LABEL_33:
    v16 = 0;
    goto LABEL_34;
  }
LABEL_9:
  if( v14 < v13 )
  {
    v19 = 4096;
    while( 1 )
    {
      v20 = v18 + 1;
      v21 = (unsigned __int64)v18[1];
      if( v21 > v10 )
        break;
      v22 = *v18;
      if( (_MDL **)((char *)&(*v18)->Next + 1) != (_MDL **)v21 )
        break;
      v23 = v13 - v16;
      if( v13 - v16 > v19 )
        v23 = v19;
      if( QuadPart < v23 + (v21 << 12) - 1 && ChildAdapter->TranslationType != ExtTranslationTypeTranslate )
      {
LABEL_27:
        DmaCanCross64K = v32;
        break;
      }
      if( !ChildAdapter->CacheCoherent && !WriteToDevice )
      {
        v24 = HalpDmaGetAdapterCacheAlignment(ChildAdapter) - 1;
        if( (v24 & ((_DWORD)v21 << 12)) != 0 || (v24 & v23) != 0 )
          goto LABEL_27;
        QuadPart = MaximumPhysicalAddress.QuadPart;
      }
      DmaCanCross64K = v32;
      if( (((unsigned __int64)v22 ^ v21) & 0xFFFFFFFFFFF00000ui64) == 0
        && (v32 == 1 || (((unsigned __int64)v22 ^ v21) & 0xFFFFFFFFFFFFFFF0ui64) == 0) )
      {
        v16 += v19;
        v18 = v20;
        if( v16 < v13 )
          continue;
      }
      break;
    }
    v14 = v33;
    v17 = v31;
    v7 = TranslationBase;
  }
  if( v16 > v13 )
  {
    v16 = v13;
    if( v12 )
    {
      AdapterCacheAlignment = HalpDmaGetAdapterCacheAlignment(ChildAdapter);
      if( ((AdapterCacheAlignment - 1) & v13) != 0 )
        v16 &= 0xFFFFF000;
    }
  }
LABEL_34:
  if( ChildAdapter->ScatterGather && v13 && !v16 )
  {
    v26 = (unsigned __int64 *)(v17 + 1);
    for( i = v14; i < v13; ++v26 )
    {
      if( *v26 <= v10 )
        break;
      i += 4096;
    }
    NextMapping = v7->NextMapping;
    if( i > v13 )
      i = v13;
    if( NextMapping )
    {
      v29 = NextMapping->PhysicalAddress >> 12;
      while( 1 )
      {
        NextMapping = NextMapping->Next;
        if( v14 >= i )
          break;
        if( !NextMapping )
          break;
        v30 = NextMapping->PhysicalAddress >> 12;
        if( v30 != v29 + 1
          || ((v29 ^ v30) & 0xFFFFFFFFFFF00000ui64) != 0
          || DmaCanCross64K != 1 && ((v29 ^ v30) & 0xFFFFFFFFFFFFFFF0ui64) != 0 )
        {
          break;
        }
        v29 = NextMapping->PhysicalAddress >> 12;
        v14 += 4096;
      }
    }
  }
}

Referenced by: