[RFC] xserver: use LRMI for real-mode calls (v2)

[Adam Jackson]

On Tue, 2009-12-01 at 08:27 +1000, Dave Airlie wrote:
> On Mon, 2009-11-30 at 17:09 -0500, Adam Jackson wrote:
> > - pci_device_read_rom() almost certainly does not need the vgaarb lock.
> > I suppose it _might_ if it's trying to grab the rom from 0xc0000, but
> > that should really be handled internal to libpciaccess if true.
> 
> On Linux the kernel shadows the 0xc0000 file and when you use /sys to
> access the boot PCI rom it always gives you the 0xc0000 copy.
> 
> So yes definitely inside libpciaccess.
> 
> libpciaccess should not fall back to 0xc0000 access itself, unless
> we are willing to say libpciaccess is only to be used for video cards.

Is it worth adding API to pciaccess to get at the legacy roms too?  It's
a slight bit of scope creep, but libx86 is going to need the 0xf0000 rom
on IGP-style machines.  Might as well hide all the mmap junk in one
place.

- ajax
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