tree a11d2e705253faaa9779cfd83bb8ca9de311b195
parent e29b545cb153f230fbd8ff4c19bc98ab950f9f5c
author Keir Fraser <Keir.Fraser@cl.cam.ac.uk> 1112217424 -0800
committer Dave Jones <davej@redhat.com> 1118172943 -0700

[PATCH] AGP fix for Xen VMM

When Linux is running on the Xen virtual machine monitor, physical
addresses are virtualised and cannot be directly referenced by the AGP
GART.  This patch fixes the GART driver for Xen by adding a layer of
abstraction between physical addresses and 'GART addresses'.

Architecture-specific functions are also defined for allocating and freeing
the GATT.  Xen requires this to ensure that table really is contiguous from
the point of view of the GART.

These extra interface functions are defined as 'no-ops' for all existing
architectures that use the GART driver.

Signed-off-by: Keir Fraser <keir@xensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>