IopOpenSystemVariableDevice

__int64 __fastcall IopOpenSystemVariableDevice(PFILE_OBJECT *FileObject, PDEVICE_OBJECT *DeviceObject, void ***a3){
  NTSTATUS DeviceObjectPointer; 
  WCHAR v7; 
  void **v8; 
  int v9; 
  WCHAR *v10; 
  NTSTATUS v11; 
  struct _UNICODE_STRING DestinationString; 
  PCWSTR SourceString; 
  DestinationString = 0i64;
  if( (IopSysEnvOverrideFlags & 1) != 0 )
  {
    RtlInitUnicodeString(
      &DestinationString,
      L"\\Device\\WindowsTrustedRT\\{699AA2F1-A42E-40DF-BABE-3AAAD2BB6A47}",
      (WCHAR)a3);
    DeviceObjectPointer = IoGetDeviceObjectPointer(&DestinationString, 0x10000000ui64, FileObject, DeviceObject);
    if( DeviceObjectPointer >= 0 )
    {
LABEL_3:
      v8 = &IopSysEnvFunctionTableTrEE;
LABEL_13:
      *a3 = v8;
      return(unsigned int)DeviceObjectPointer;
    }
    goto LABEL_8;
  }
  SourceString = 0i64;
  IopGetDeviceInterfaces(&GUID_EFI_VARIABLE_SERVICE, 0i64, 0i64, 0, (WCHAR **)&SourceString, 0i64);
  if( v9 < 0 || (v10 = (WCHAR *)SourceString, !*SourceString) )
  {
LABEL_8:
    RtlInitUnicodeString(&DestinationString, L"\\Device\\SysEnv", v7);
    v11 = IoGetDeviceObjectPointer(&DestinationString, 0x10000000ui64, FileObject, DeviceObject);
    DeviceObjectPointer = v11;
    if( v11 >= 0 )
    {
      v8 = &IopSysEnvFunctionTableSysEnv;
      goto LABEL_13;
    }
    if( (unsigned int)(v11 + 1073741773) <= 1 || v11 == -1073741766 )
    {
      *FileObject = 0i64;
      v8 = (void **)&IopSysEnvFunctionTableHal;
      *DeviceObject = 0i64;
      DeviceObjectPointer = 0;
      goto LABEL_13;
    }
    return(unsigned int)DeviceObjectPointer;
  }
  RtlInitUnicodeString(&DestinationString, SourceString, v7);
  DeviceObjectPointer = IoGetDeviceObjectPointer(&DestinationString, 0x10000000ui64, FileObject, DeviceObject);
  ExFreePoolWithTag(v10, 0);
  if( DeviceObjectPointer >= 0 )
    goto LABEL_3;
  return(unsigned int)DeviceObjectPointer;
}

Referenced by: