Xserver device I/O on Linux

[Jesse Barnes]

In case it's not clear, I'm referring to the X.Org X11R6.7.0 Xserver, not the 
other freedesktop.org Xserver, which I think is Kdrive based?

On Thursday, April 29, 2004 3:02 pm, Jesse Barnes wrote:
> In trying to port the X server to SGI ia64-based sn2 machines, I ran into a
> few problems, and I'm wondering what people think (if this discussion has
> happened before, please point it out to me--I've looked around a bit but
> haven't found much).
>
> Device discovery:  all Linux ports that I'm aware of provide a PCI API
> that's accessable via /proc/bus/pci.  It seems like it would make sense to
> simplify some of the Linux code by assuming this was true.
>
> Device I/O: some platforms (like sn2 and ppc) don't provide a way to do
> port I/O and mapping in the way that the server expects.  Would it make
> sense to have a per-device IO base address so that these platforms (and
> others like them) could simply use loads and stores to access the I/O ports
> they need? Mapping could also be done relatively simply if we assumed the
> presence of the /proc/bus/pci API.
>
> Ideally, all of the Linux device access code would be unified, but I'm not
> sure if that's possible, so I'm willing to do this just for ia64 as long as
> people are ok with the non-platform specific bits.
>
> Any thoughts?
>
> Thanks,
> Jesse
>
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