[r300] Prototype for implementing vertex buffer allocations in user space

[Aapo Tahkola]

These patches implement simple vertex buffer allocations in user space.
Relying on radeon_alloc means that reclaiming buffers allocated by other 
processes isnt possible.

-- 
Aapo Tahkola

r300_user_buffers.patch
Description: Binary data

r300_drm_scratch.patch
Description: Binary data