ahlab.c

void __fastcall Func007(
        int IoControlCode,
        MEMOP *InputBuffer,
        __int64 InputBufferLength,
        MEMOP *OutputBuffer,
        int OutputBufferLength,
        _DWORD *StatusInformation)
{
  PHYSICAL_ADDRESS PhysicalAddress;
  PMDL MemoryDescriptorList;
  PVOID BaseAddress;
  PVOID MappedSystemVa;

  *StatusInformation = OutputBufferLength;
  if ( IoControlCode == 0x81000000 )
  {
    MemoryDescriptorList = IoAllocateMdl(InputBuffer->VirtualAddress, InputBuffer->Length, 0, 1u, 0i64);
    if ( MemoryDescriptorList )
    {
      MmProbeAndLockPages(MemoryDescriptorList, 1, IoReadAccess);
      if ( (MemoryDescriptorList->MdlFlags & 5) != 0 )
        MappedSystemVa = MemoryDescriptorList->MappedSystemVa;
      else
        MappedSystemVa = MmMapLockedPagesSpecifyCache(MemoryDescriptorList, 0, MmCached, 0i64, 0, 0x10u);
      if ( MappedSystemVa )
      {
        if ( (PhysicalAddress = MmGetPhysicalAddress(InputBuffer->BaseAddress)
          && PhysicalAddress.LowPart
          || PhysicalAddress.HighPart > 0 )
        {
          BaseAddress = MmMapIoSpace(PhysicalAddress, LODWORD(InputBuffer->Length), MmNonCached);
          if ( BaseAddress )
          {
            qmemcpy(BaseAddress, MappedSystemVa, LODWORD(InputBuffer->Length));
            MmUnmapIoSpace(BaseAddress, LODWORD(InputBuffer->Length));
          }
        }
      }
      MmUnlockPages(MemoryDescriptorList);
      IoFreeMdl(MemoryDescriptorList);
    }
  }
}