On Tue, Nov 15, 2005 at 02:05:24AM +0100, Andi Kleen wrote:
> On Tuesday 15 November 2005 01:38, George Anzinger wrote:
>
> > Doesn't this depend on the atomic nature of the 64-bit read? If it
> > is really two 32-bit reads one would need to do extra work to make
> > sure the two parts belong together.
>
> Please take a look at the Subject.
Still, the HPET doesn't necessarily have to be a 64-bit device. At least
on AMD systems, where it's implemented in AMD8111 Thor, it's bundled
together with other, 32-bit PCI devices like USB. On the other hand, the
8111 HPET doesn't implement a 64-bit conter, and it's likely that the
Intel implementation in the northbridges (or *CH, as Intel prefers
calling the things) is likely native 64-bit.
--
Vojtech Pavlik
SuSE Labs, SuSE CR
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