At 3:46 PM -0700 2001-05-01, Linus Torvalds wrote:
>On Tue, 1 May 2001, Russell King wrote:
> >
>> In which case, can we change the following in IO-mapping.txt please?
>
>Oh, sorry. I misread your question. The _return_ value is a cookie.
>
>The first argument should basically be the start of a "struct pci_dev"
>resource entry, but obviously architecture-specific code can (and does)
>know what the thing means. And the ISA space (ie 0xA0000-0x100000) has
>been considered an acceptable special case.
>
>So the only usage that is "portable" is to do something like
>
> cookie = ioremap(pdev->resource[0].start, pdev->resource[0].len);
>
>and I guess we should actually create some helper functions for that too.
>
>You can use ioremap in other ways, but there's nothing to say that they
>will work reliably across multiple PCI buses etc.
What's the Linu[sx] attitude to using a type to help control (and
illuminate) the use of these objects? I'm thinking here in particular
of the cookie returned by ioremap() and used by readx/writex, but I
suppose there might be similar applicability to its first parameter.
--
/Jonathan Lundell.
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