Re: [PATCH] fix ppc ioremap prototype

David S. Miller
2003-09-04T17:14:36Z

On Thu, 4 Sep 2003 10:06:48 -0700 (PDT)
Linus Torvalds <torvalds@osdl.org> wrote:

>
> On Thu, 4 Sep 2003, David S. Miller wrote:
> >
> > > So clearly ioremap() has to work for other buses too.
> >
> > What if they are like I/O ports on x86 and require special
> > instructions to access?
>
> ioremap() is very easy to explain to a mathematician: its "domain" is
> _exactly_ that which is in the "iomem_resource" tree. The "range" is a
> virtual address.

A virtual address? On x86 IOMEM resources are stored as physical
addresses and ioremap() returns a virtual mapping of that physical
address.

Maybe our wires are just crossed.