Messages in this thread | | | Date | Mon, 30 Jun 2003 23:06:52 -0700 | From | "H. Peter Anvin" <> | Subject | Re: PCI domain stuff |
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David S. Miller wrote: > [ Pater, please retain the CC: list in your replies. I scan > linux-kernel casually at best, and I probably would have missed > this reply of yours under normal circumstances, if you had retained > the CC: list I would have read it via my non-lkml account and therefore > not have missed it. ]
Unfortunately, I can't, because I never see it. One of the very few disadvantages with reading LKML via a newsreader.
> On Mon, 2003-06-30 at 22:47, H. Peter Anvin wrote: > >>Presumably only on architectures which use memory-mapped IO address >>space. > > On ones that don't we use the x86's existing facilities for doing > this, ioperm() and direct I/O instructions. > > These issues are platform dependant for other reasons anyways > (endianness, barrier instructions needed, etc.)
Right. As long as this is clear to people; I'm not sure it always is.
Perhaps a libdirectio would be useful?
> But everything the most demanding testcase in userspace needs (this > being xfree86) needs can be done with the existing facilities. > > Unlike other people, I do not see the value in having 50 ways to > do the same thing. :-)
Agreed with that, *as long as* the implementation is sane.
-hpa
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