Re: Is Athlons IOMMU supported?

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From: kingzog (kingzog_1_at_lycos.com)
Date: 02/28/05 

Date: 28 Feb 2005 12:59:13 -0800

Maxim S. Shatskih wrote:
> What is IOMMU? IIRC it is Sun-only thing. /iommu/sbus/...
> boot namespace of Sparcstations.
>

On AMD64, the Linux kernel people worked out they could (ab)use the
GART table as an IOMMU. The 32 bit PCI device sees 32 bit addresses,
and the GART maps them into 64 bit ones.

What happens in Win64 when you have a PCI device which can't do dual
address cycles and a buffer above 4GB - e.g. in some user application?

Zog.

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