Re: Equivalent of ioperm / iopl in linux mips ?

[Ralf Baechle <ralf@oss.sgi.com>]

On Mon, Apr 22, 2002 at 05:30:08PM +0200, Maciej W. Rozycki wrote:

>  Well, for Alpha ioperm/iopl functions check the system type in
> /proc/cpuinfo (we seem to have enough information there as well) and
> failing this they check a result of readlink of /etc/alpha_systype.  Then
> an appropriate region of /dev/mem is mmapped with per-page permissions set
> up as requested if ioperm is used (with a worse granularity, though) and
> subsequent in/out function invocations access the area as appropriate. 
> See sysdeps/unix/sysv/linux/alpha/ioperm.c in glibc for details -- it's a
> pretty clever solution with good performance and only a few trade-offs.

Thanks for volunteering ;)

  Ralf