Re: [patch] 32-bit dma memory zone

[H. Peter Anvin]

Followup to:  <[e-mail]>
By author:    [e-mail] (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
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