Re: [Qemu-devel] Hardware interrupts

[Paul Brook]

> "In order to be faster, QEMU does not check at every basic block if an
> hardware interrupt is pending. Instead, the user must asynchrously call a
> specific function to tell that an interrupt is pending. This function
> resets the chaining of the currently executing basic block. It ensures that
> the execution will return soon in the main loop of the CPU emulator. Then
> the main loop can test if the interrupt is pending and handle it."
> What means "the user must asynchrously call a specific function..."?
>
> In which sense "user must"?

Whoever wants to raise the interrupt.

> Which "Specific function"?

Usually pic_set_irq_new.

I recommend you look at how the existing hardware devices are implemented. 
That should answer most of your questions. I'd start with something simple 
like serial.c or pl050.c

Paul