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Date:      Mon, 21 Jun 2010 16:28:22 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        Alexander Motin <mav@freebsd.org>
Cc:        Kostik Belousov <kostikbel@gmail.com>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org
Subject:   Re: svn commit: r209371 - in head/sys: amd64/amd64 amd64/include conf dev/acpica i386/i386 i386/include isa kern pc98/cbus sys x86/isa x86/x86
Message-ID:  <201006211628.22494.jhb@freebsd.org>
In-Reply-To: <4C1FC6C1.5060800@FreeBSD.org>
References:  <201006202133.o5KLXTG1023067@svn.freebsd.org> <20100621195838.GJ13238@deviant.kiev.zoral.com.ua> <4C1FC6C1.5060800@FreeBSD.org>

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On Monday 21 June 2010 4:08:33 pm Alexander Motin wrote:
> Kostik Belousov wrote:
> > On Sun, Jun 20, 2010 at 09:33:29PM +0000, Alexander Motin wrote:
> >> Author: mav
> >> Date: Sun Jun 20 21:33:29 2010
> >> New Revision: 209371
> >> URL: http://svn.freebsd.org/changeset/base/209371
> >>
> >> Log:
> >>   Implement new event timers infrastructure. It provides unified APIs for
> >>   writing event timer drivers, for choosing best possible drivers by 
machine
> >>   independent code and for operating them to supply kernel with 
hardclock(),
> >>   statclock() and profclock() events in unified fashion on various 
hardware.
> > 
> > This broke QEMU for me. I cannot boot FreeBSD guest under QEMU anymore.
> > QEMU (not FreeBSD kernel) panics with
> > qemu: level-triggered hpet not supported
> > message.
> 
> According to specification, it is not optional. No more cookies!

Why do you even need a level triggered interrupt?  The FSB interrupt is not 
shared with anything else, so it can be edge triggered just fine.  We set all 
MSI interrupts to edge triggered on x86.

-- 
John Baldwin



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