On Mon, 22 Apr 2002, Maciej W. Rozycki wrote:
> On Sat, 20 Apr 2002, Geert Uytterhoeven wrote:
> > > Does anyone know how to implement ioperm / iopl type
> > > functionality on a mips system. Any example code would
> > > be appreciated.
> >
> > Like on most architectures that use memory mapped I/O: mmap() the relevant
> > portion of /dev/mem and read/write to/from the mapped area.
>
> Hmm, I admit I haven't looked at this matter, but aren't
> in/out/ioperm/iopl implemented as library functions in glibc like for
> other architectures doing MMIO? E.g. Alpha does this an it makes porting
Perhaps. Note that you still need some /proc magic to find out the correct
address to map. Or you can use /dev/ports.
> programs like XFree86 and SVGATextMode much more straightforward and less
> processor-specific. That makes sense as they are not processor specific
> but rather bus-specific. If we don't do that, we should. For platforms
> without an (E)ISA or a PCI bus ioperm/iopl would simply return an error.
Yes indeed.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
