Re: [RFC] I/O Access Abstractions

David Howells
2001-07-03T08:16:29Z

Jeff Garzik <jgarzik@mandrakesoft.com> wrote:
> Russell King wrote:
> >
> > On Mon, Jul 02, 2001 at 05:56:56PM +0100, Alan Cox wrote:
> > > Case 1:
> > > You pass a single cookie to the readb code
> > > Odd platforms decode it
> >
> > Last time I checked, ioremap didn't work for inb() and outb().
>
> It should :)

Surely it shouldn't... ioremap() is for mapping "memory-mapped I/O" resources
into the kernel's virtual memory scheme (at least on the i386 arch). There's
no way to tell the CPU/MMU that a particular pages should assert the IO access
pin rather than memory access pin (or however it is done externally).

David