message: create warning message if HermitCore receive an unknown interrupt
diff: @@ -184,12 +184,12 @@ pub fn install() {
  #[no_mangle]
  pub extern "C" fn irq_install_handler(irq_number: u32, handler: usize)
  {
  - info!("Install handler for interrupt {}", irq_number);
  + warn!("Install handler for interrupt {}", irq_number);
  idt::set_gate((32+irq_number) as u8, handler, 0);
  }
  fn unhandled_interrupt(irq_number: u8) {
  - info!("Receive unhandled interrupt {}", irq_number);
  + warn!("Receive unhandled interrupt {}", irq_number);
  apic::eoi();
  }
  