Re: [Xen-devel] Drivers

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> > On Mon, 25 Oct 2004, Ian Pratt wrote:
> > 
> > > The only hardware drivers known to have problems are agpgart and
> > > drm.
> > 
> > And a bunch of old ISA drivers that need isa_virt_to_bus.
> > Chances are the only one people will notice here is the
> > floppy driver - but I haven't heard any complaints yet, so ;)
> 
> Yes, good point. I guess this could cause problems for some older
> PCMCIA devices too.
> 
> However, since we now give dom0 a direct map of the bottom 1MB of
> memory (starting at PAGE_OFFSET) it may be trivial to implement
> isa_virt_to_bus e.g. as virt_to_phys as per normal i386.
> 
> Anyone still got a floppy drive to try this out on? ;-)

The mapping of ISA space is actually in the fixmap
region. Furthermore, it is only the lowest 1MB of memory -- but I
think the isa_* macros can be used for the lowest 16MB.

 -- Keir


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