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Re: [Qemu-devel] Re: [PATCH] sparc32 irq clearing (guest Solaris perfor

From: Artyom Tarasenko
Subject: Re: [Qemu-devel] Re: [PATCH] sparc32 irq clearing (guest Solaris performance+NetBSD) fix
Date: Mon, 16 Nov 2009 23:44:07 +0100

2009/11/16 Jamie Lokier <address@hidden>:
> Artyom Tarasenko wrote:
>> I don't know, how the real sun4m reacts in the case where irq stays
>> on, not being cleared.
>> It can not be though that it would try to process irq for every next
>> tick. The CPU must have some time to clear the pending irq, so it must
>> be edge triggered too, at least in a way.
> In general, most CPUs have a "disable interrupts" flag which is set at
> the same time as calling the irq handler.

I see. The handler has enough time to clear pending irq then. Maybe
there is really no latch.

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