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swiotlb in x86 and x86-64 query

Hi All,

The lib/swiotlb.c code effectively is used for simulating hardware
IOMMU unit.Am i right?

I see most of the discussions over net using swiotlb related to x86-64
architecture only and not related to x86,  why so?
Is swiotlb specifically only for 64 bit architecures?

Atleast this is what i can make out from the location of swiotlb
specific code's location under the vanilla tree.

Any pointers?

Thanks
~psr
--
play the game

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