From: Bernhard Kauer <kauer@os.inf.tu-dresden.de>
To: kvm@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] i8259 defaults wrong?
Date: Tue, 18 Aug 2009 11:39:54 +0200 [thread overview]
Message-ID: <20090818093932.GA1887@chrom.inf.tu-dresden.de> (raw)
In-Reply-To: <20090817022024.GE1025@MAIL.13thfloor.at>
On Mon, Aug 17, 2009 at 04:20:24AM +0200, Herbert Poetzl wrote:
> looking at the i8259 implementation found in qemu
> as well as in the in-kernel kvm implementation, I
> see that on pic_reset() special_fully_nested_mode
> is set to zero, but the intel(r) 8259A manual says
> on page 15:
>
> Fully Nested Mode
>
> This mode is entered after initialization unless
> another mode is programmed.
>
> any comments are appreciated,
You confuse two modes of the PIC: the FullyNestedMode
and the SpecialFullyNestedMode. See page 18 in the
manual.
The first ist the "default" mode, where an IRQ in
service from a slave masks further interrupts from this
slave. In SFNM a slave PIC can still issue another
IRQ.
Greetings,
Bernhard Kauer
prev parent reply other threads:[~2009-08-18 10:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 2:20 [Qemu-devel] i8259 defaults wrong? Herbert Poetzl
2009-08-17 9:54 ` [Qemu-devel] " Avi Kivity
2009-08-18 1:02 ` Herbert Poetzl
2009-08-18 7:46 ` Avi Kivity
2009-08-18 9:39 ` Bernhard Kauer [this message]
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