the virtual address from a uoffset, e.g. uoffset + vm_map_min(kernel_map).
- Eliminate the bus_space_read/write-based DRM_READ/WRITE macros. The
memory we're reading/writing from is not always allocated with bus_space,
and so this will not do. Instead, since all of our bus_space maps are
linear, volatile pointer dereferences will do just fine.
- Unify members of struct drm_dma_handle amongst freebsd and netbsd:
the 'addr' member was superfluous; also, set dmah->tag from
dev->pa.pa_dmat and use that.
- we don't need BUS_DMA_ALLOCNOW, as bus_dmamap_load is called immediately
following bus_dmamap_create(), so there's no need to avoid deferring
allocation to load time.
- Add check for nsegs != 1 in drm_pci_alloc().
- We don't need the DRM_PCI_DMAADDR macro right now--it was only
used once.
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