static NIC_DEVICE: Mutex<Option<Arc<dyn NetworkDevice>>>Expand description
Global reference to the first NIC device, used by nic_handler to call
handle_interrupt(). Set via set_nic_device() after PCI probe.
ยงTODO (multi-NIC)
This only supports a single NIC. When multiple NICs are present the handler should iterate all registered devices or use per-IRQ dispatch.