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Re: [PATCH gnumach] interrupt: Mask, eoi, unmask

From: Damien Zammit
Subject: Re: [PATCH gnumach] interrupt: Mask, eoi, unmask
Date: Mon, 02 Oct 2023 00:38:30 +0000

On 2/10/23 10:56, Samuel Thibault wrote:
> So in the end, I'd tend to think that it's up to queue_intr to do the
> unmasking, like it does now, while spl is still high and thus we don't
> risk nesting. That way it's the in-kernel intr handler that knows
> whether to mask/unmask or not. I.e. it'd be like this:
> - interrupt.S raises spl (thus IF cleared)
> - interrupt.S EOI
> - interrupt.S calls the handler
>    - for pure in-kernel handlers, they do whatever they want with IF
>      cleared.
>    - when a userland handler is registers, queue_intr masks the irq.
> - interrupt.S lowers spl with splx_cli, thus IF still cleared
> - iret, that clears the IF
> - later on, userland acks the IRQ, that unmasks the irq
> Is that not already very close to what we have currently?

Yes this is very close to what we have now.
I think we just need to remove the if >=16 part to do it for
all interrupts and remove the EOI call in irq_acknowledge.


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