Mark Kettenis [mark.kette...@xs4all.nl] wrote: > > We really don't want to implement bounce-buffers. Adding IOMMU > support is probably a better approach as it also brings some security > benefits. Not all amd64 hardware supports an IOMMU. And hardware > that does support it doesn't always have it enabled. But for modern > hardware an iommu is pretty much standard, except for the absolute > low-end. But those low-end machines tend to have only 2GB of memory > anyway.
Is the sparc64 iommu code port usable for this purpose? http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/arch/amd64/amd64/Attic/sg_dma.c
