Hardware & Devices

KIRQL ChangeIRQL()
{
  // some code
  if (currentirql < DISPATCH_LEVEL)
  {
    KeRaiseIrql(DISPATCH_LEVEL, &previousirql);
  }
  return (previousirql);
}

PKDPC LockCPU()
{
  //some code
  if(KeGetCurrentIrql() != DISPATCH_LEVEL)
  {
    return NULL;
  }

  //some code
}

NTSTATUS DriverEntry(IN PDRIVER_OBJECT ptrDriverObject, IN PUNICODE_STRING registryPath)
{
  //some code
  irql = ChangeIRQL();
  dpcPtr = LockCPU();
  //some code
}