neel 78a2d25433 Add support for CPUs with cache coherent DMA. The two main changes are:
- We don't need to fall back to uncacheable memory to satisfy BUS_DMA_COHERENT
  requests on these CPUs.

- The bus_dmamap_sync() is a no-op for these CPUs.

A side-effect of this change is rename DMAMAP_COHERENT flag to
DMAMAP_UNCACHEABLE. This conveys the purpose of the flag more accurately.

Reviewed by: gonzo, imp
2010-03-04 05:23:08 +00:00
..
2010-02-09 06:24:43 +00:00
2010-02-09 06:24:43 +00:00
2010-02-09 06:24:43 +00:00