irq.txt

\section{中断处理}

中断本身是一个能够等待的对象。它的handler很简单，就是唤醒等待的线程。

在处理ISA的传统中断号时，需要让系统检查它是否被remap过。得到global irq.
\begin{verbatim}
InterruptEventDispatcher::Create
  vector = remap_interrupt(vector);

  disp->RegisterInterruptHandler();
    register_int_handler(vector_, IrqHandler, this);

zx_interrupt_wait(device->irq, NULL);
  interrupt->WaitForInterrupt(&timestamp);
    event_wait_deadline(&event_, ZX_TIME_INFINITE, true);
      event_wait_worker(e, deadline, interruptable, 0);
        current_thread = get_current_thread();
          wait_queue_block_with_mask(&e->wait, deadline, signal_mask);

handler:
InterruptEventDispatcher::IrqHandler(void* ctx)
  thiz->InterruptHandler();
    Signal();
      event_signal_etc(&event_, true, ZX_OK);
        event_signal_internal(e, reschedule, wait_result, false);
          wait_queue_wake_all(&e->wait, reschedule, wait_result);

\end{verbatim}