On Mon, Jun 10, 2002 at 07:22:26PM +0200, Oliver Neukum wrote:
> Definitely we should call it something different so we can limit it to
> architectures that need it.
DMA_ALIGN, DMA_ALIGN_BYTES or DMA_CACHE_BYTES.
Hmm, thinking about this some more (and just rambling). On some ARMs
(maybe other CPUs as well) each cache line has two dirty bits - one
for each half. If only half the cache line is dirty, it will only
write out the dirty half when evicting it. In this case, we'd want:
#define L1_CACHE_BYTES 32
#define DMA_CACHE_BYTES 16
which will probably work as long as we handle stuff carefully in the
architecture specific layer.
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
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This archive was generated by hypermail 2b29 : Sat Jun 15 2002 - 22:00:18 EST