From: Jan Kiszka <jan.kiszka@web.de>
To: Avi Kivity <avi@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Matthew Ogilvie <mmogilvi_qemu@miniinfo.net>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v5 5/6] i8259: fix so that dropping IRQ level always clears the interrupt request
Date: Mon, 10 Sep 2012 11:09:27 +0200 [thread overview]
Message-ID: <504DAE47.8090607@web.de> (raw)
In-Reply-To: <504DAB38.4000407@redhat.com>
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On 2012-09-10 10:56, Avi Kivity wrote:
> On 09/10/2012 04:27 AM, Matthew Ogilvie wrote:
>> Intel's definition of "edge triggered" means: "asserted with a
>> low-to-high transition at the time an interrupt is registered and
>> then kept high until the interrupt is served via one of the
>> EOI mechanisms or goes away unhandled."
>>
>> So the only difference between edge triggered and level triggered
>> is in the leading edge, with no difference in the trailing edge.
>
> Hard to believe. So an edge while cpu interrupts are disabled is ignored?
No, this is about the PIC, not the CPU interrupt inputs.
Matthew, did you verify this on real hardware by reading back the IRR as
I suggested?
Jan
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next prev parent reply other threads:[~2012-09-10 9:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-10 1:27 [Qemu-devel] [PATCH v5 0/6] Running Microport UNIX (ca 1987) Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 1/6] fix some debug printf format strings Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 2/6] vl: fix -hdachs/-hda argument order parsing issues Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 3/6] qemu-options.hx: mention retrace= VGA option Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 4/6] vga: add some optional CGA compatibility hacks Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 5/6] i8259: fix so that dropping IRQ level always clears the interrupt request Matthew Ogilvie
2012-09-10 8:56 ` Avi Kivity
2012-09-10 9:09 ` Jan Kiszka [this message]
2012-09-10 9:18 ` Avi Kivity
2012-09-10 9:33 ` Jan Kiszka
2012-09-10 13:09 ` Maciej W. Rozycki
2012-09-11 12:57 ` Avi Kivity
2012-09-11 4:32 ` Matthew Ogilvie
2012-09-11 9:05 ` Jan Kiszka
2012-09-11 12:58 ` Avi Kivity
2012-11-19 15:28 ` BALATON Zoltan
2012-11-20 5:05 ` Matthew Ogilvie
2012-09-10 1:27 ` [Qemu-devel] [PATCH v5 6/6] i8259: refactor pic_set_irq level logic Matthew Ogilvie
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