From: Linus Torvalds <[email protected]>
Date: Thu, 25 Jan 2007 22:18:21 -0800 (PST)
> So on sparc64, "ioport_resource" really is just a container for the actual
> per-domain resource buckets that the hardware (within that domain) will
> then do the resource allocation from. Afaik.
>
> But you should actaully verify that with somebody like Davem if you
> _really_ care. I cc'd him in case he wants to pipe up and perhaps prove
> me wrong.
They are all physical addresses of the I/O locations.
It just so happens that all the non-memory physicall addresses
have some high bit set.
So it all works out, but not intentionally, it's merely a side
effect of how the physical address space is layed out.
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