bouyer@antioche.lip6.fr (Manuel Bouyer) writes:
> On an alpha or with more than 4G of RAM these ops
> will probably copy the DMA buffer when needed (i.e. if it lives in a regions
> > 4G).

actually, most alphas worth their salt have (basically) virtual DMA,
where you can map on a page-by-page basis which locations in RAM will
be accessed by dma accesses to certain regions of bus space.

these are used on alpha to implement most bounce buffers, for
instance.



cgd