Messages in this thread | | | Subject | Re: user space writel() etc. in 2.2.2 | From | Jes Sorensen <> | Date | 05 Mar 1999 18:14:00 +0100 |
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>>>>> "Alan" == Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
>> Alpha + sparse memory + mmap'ed frame buffer + mmap'ed control >> registers. >> >> I am not that familiar with the sparse mem but I doubt mmap() has a >> kludge to get around it (I found out the hard way why readl/writel >> is needed when porting the AceNIC driver to run an Avanti).
Alan> The Alpha functions sometimes use a kernel jump table. Im sure Alan> thats really going to work well from user space. The moment you Alan> go digging into devices directly from user space you lose Alan> portability.
Hmmm, good point - I wonder how the XFree people solved this for the Alpha X servers.
Jes
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