This patch adds AGP support for the U3 northbridge used in Apple G5
machines to drivers/char/agp/uninorth-agp.c.  This patch is based on
earlier work by Jerome Glisse.  With this patch, the driver works in
both ppc32 and ppc64 kernels.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>