Re: [PATCH] fix ppc ioremap prototype

[David S. Miller]

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