Messages in this thread | | | Date | Fri, 5 Mar 1999 09:12:53 -0700 (MST) | From | Vassili Leonov <> | Subject | Re: user space writel() etc. in 2.2.2 |
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On Fri, 5 Mar 1999, Alan Cox wrote:
> > Q: what is the right way to access IO memory under 2.2.2 ? > > mmio space by using mmap() as with 2.0, and pc style io space with > inb inw etc (which are exported with __KERNEL__ not defined) Sorry, I was wrong in my previous mail. Of course I use mmap() to access the IO memory space for the board. I want a portable, provided by Linux libraries equivalent of
((*(volatile unsigned char *) ( base )) = ( v )) ;
before 2.1.3 that was asm/io.h that defined writel(v,base) as such. Then the #ifdef __KERNEL__ was put around them.
I'm generally speaking amazed - does it mean that nobody wrote any user (superuser) space I/O code in a clean way since 2.1.3 (which was 1996 BTW)?
#------------------------------------# | Linux Media Labs LLC | Vassili Leonov #------------------------------------# mailto:vleo@linuxmedialabs.com http://linuxmedialabs.com phone:1-719-231-3173
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