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Re: [Qemu-devel] [PATCH 1/2] Add HPET emulation to qemu (v4)
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From: |
Jamie Lokier |
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Subject: |
Re: [Qemu-devel] [PATCH 1/2] Add HPET emulation to qemu (v4) |
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Date: |
Fri, 14 Nov 2008 03:12:18 +0000 |
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User-agent: |
Mutt/1.5.13 (2006-08-11) |
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