AGP support for newer Intel chips (9xx)
Here's a patch to add an AGP GART support for newer Intel chips. I've tested
it with i945G + modular-xorg + several media players.
Note that I'm new to DF kernel and the patch is mostly a blind merge from
On FreeBSD i845G support seems to be accidentally dropped at r1.37.
I recovered it in the patch above.
On DragonFly PCI_MAP_FIXUP option is required for i915 variants because
AGP_APBASE and AGP_I915_MMADR points the same address. (?)
Some rework would be needed to eliminate redundant allocations.
Known bug: panic on detach. I don't know why the function is working on
FreeBSD. (maybe not?)