From: Rik van Riel <riel@conectiva.com.br>
Date: Wed, 23 Jan 2002 08:31:32 -0200 (BRST)
This means that when using 4kB pages instead of 4MB
pages the agp data is "fenced off" from the other
kernel data.
Kernel data this explains, thank you.
But on the user side, we map these GART-mapped pages into user space
with the cacheable bit set.
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