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SubjectRe: [patch] 32-bit dma memory zone
Date
Followup to:  <m13d9b3ttj.fsf@frodo.biederman.org>
By author: ebiederm@xmission.com (Eric W. Biederman)
In newsgroup: linux.dev.kernel
>
> The AMD760 which looks like it might walk on both the alpha, an x86
> side of the fence also has an iommu. Mostly it's used for AGP but
> according to the docs it should be able to handle the other cases as
> well. The only downside is that it only supports 4GB of ram...
>
> Anyway we shouldn't assume iommu's don't exist on x86.
>

On most chips the AGP GART isn't just limited to AGP; it's a
full-fledged iommu. The main problem with it is that it is usually a
rather limited space it provides.

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
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