From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/2] Add HPET emulation to qemu (v4)
Date: Fri, 14 Nov 2008 03:12:18 +0000 [thread overview]
Message-ID: <20081114031218.GI2055@shareable.org> (raw)
In-Reply-To: <1226613844.1157.43.camel@beth-laptop>
Beth Kon wrote:
> - enabled 64-bit capability (after discovering that OS is
> warned in HPET spec about possibility that a 64-bit read may
> be implemented as two 32-bit reads).
It's in the spec, but are there any real x86_64 machines where 64-bit
HPET read would be translated into two 32-bit reads? I'm wondering if
some OSes ssume reading HPET with a 64-bit read on x86_64 is atomic,
because that might be true. Linux seems to use HPET in 32-bit mode so
that's safe (I checked Linux 2.6.26).
-- Jamie
next prev parent reply other threads:[~2008-11-14 3:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-13 22:04 [Qemu-devel] [PATCH 1/2] Add HPET emulation to qemu (v4) Beth Kon
2008-11-14 3:12 ` Jamie Lokier [this message]
2008-11-14 15:29 ` Beth Kon
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