Re: [RFC] MMIO accessors & barriers documentation

Alan Cox
2006-09-11T17:06:13Z

Ar Llu, 2006-09-11 am 19:59 +1000, ysgrifennodd Benjamin Herrenschmidt:
> Ok, so we would define ordering on the first and last accesses (being
> the first and last in ascending addresses order) and leave it free to
> the implementation to do what it wants in between. Is that ok ?

Not sure you can go that far. I'd stick to "_fromio/_toio" transfer
blocks of data efficiently between host and bus addresses. The
guarantees are the same as readl/writel respectively with respect to the
start and end of the transfer.

[How do you define start and end addresses with memcpy_fromio(foo, bar,
4) for example ]