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Date: Wed, 29 Oct 2008 20:09:15 +0200
From: "Blue Swirl" <blauwirbel@gmail.com>
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References: <20080923013136.490117fd.yoshii.takashi@gmail.com>
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Subject: [Qemu-devel] Re: [PATCH 2/3] take3 sh4: Add IRL(4bit encoded
	interrupt input) support.
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To: "takasi-y@ops.dti.ne.jp" <takasi-y@ops.dti.ne.jp>
Cc: qemu-devel@nongnu.org

On 10/28/08, takasi-y@ops.dti.ne.jp <takasi-y@ops.dti.ne.jp> wrote:
> > Isn't it possible to use existing qemu_irq for the signals instead? On
>  > Sparc32, I have used qemu_irq for interrupt lines, reset signals and a
>  > terminal count pulse, one version used it for DMA request.
>
>  I have re-written them using qemu_irq.
>  This use qemu_irq as multi-level signal. I mean LEVEL as in
>   qemu_set_irq(irq, LEVEL) is {0...15} but {0,1}.

If an irq is active at some level, and another irq at some other level
arrives, doesn't the first one get lost? Maybe SH has edge-triggered
irqs and this is OK, I don't know.

Sparc32 has similar 15 level interrupt system with priorities. I've
used a separate qemu_irq for each of these, but perhaps your way could
work if I used a bitmap.