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From: "David S. Miller" <davem@redhat.com>
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Date: Thu, 14 Jun 2001 14:35:21 -0700 (PDT)
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jeff Garzik <jgarzik@mandrakesoft.com>, <linux-kernel@vger.kernel.org>,
        "Albert D. Cahalan" <acahalan@cs.uml.edu>,
        Tom Gall <tom_gall@vnet.ibm.com>
Subject: Re: Going beyond 256 PCI buses
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Benjamin Herrenschmidt writes:
 > I beleive there will always be need for some platform specific
 > hacking at probe-time to handle those, but we can at least make
 > the inx/outx functions/macros compatible with such a scheme,
 > possibly by requesting an ioremap equivalent to be done so that
 > we stop passing them real PIO addresses, but a cookie obtained
 > in various platform specific ways.

The cookie can be encoded into the address itself.

This is why readl() etc. take one arg, the address, not a billion
other arguments like some systems do.

Later,
David S. Miller
davem@redhat.com