Messages in this thread | | | Subject | Re: user space writel() etc. in 2.2.2 | From | Jes Sorensen <> | Date | 05 Mar 1999 17:37:04 +0100 |
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>>>>> "Alan" == Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
>> in the io.h file functions to read/write IO memory >> (writel(),readl() etc.) are only defined with __KERNEL__ macro >> defined. Under 2.0.36 that was not the case.
Alan> Those macros arent usable in their native form
Which is believe is a problem!
>> I don't like setting __KERNEL__ for user space allications, besides >> it produces a lot of errors when I try to compile. >> >> Q: what is the right way to access IO memory under 2.2.2 ?
Alan> mmio space by using mmap() as with 2.0, and pc style io space Alan> with inb inw etc (which are exported with __KERNEL__ not Alan> defined)
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).
Jes
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