Messages in this thread | | | Date | Thu, 4 Sep 2003 10:03:43 -0700 | From | "David S. Miller" <> | Subject | Re: [PATCH] fix ppc ioremap prototype |
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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.
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