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    SubjectRe: [PATCH] fix ppc ioremap prototype
    On Thu, 4 Sep 2003 07:15:35 -0700
    Matt Porter <mporter@kernel.crashing.org> wrote:

    > The global space method doesn't allow for proper resource management
    > in systems with a small floating physical address window but a huge
    > bus address space to be accessed. MPC8245's DAC scheme is a good
    > example of this as well as numerous Xscale PCI implementations.
    > Paul's suggestion would allow the removal of lots of ugly hacks.

    There is nothing that cannot be represented with a big integer.
    Encode the "window" in the upper bits, or whatever, get creative.
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