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    SubjectRe: [git pull] drm patches for 2.6.27-rc1


    On Sat, 18 Oct 2008, Jon Smirl wrote:
    >
    > Is it possible to use a segment register to map the whole aperture on
    > 32b?

    No. Segment registers don't extend the virtual address space, they can
    only limit visibility into the one single 32-bit one.

    IOW, segment registers don't actually extend addressing in any way, they
    only limit it. There's a reason why people don't use them (except as a
    strange base register for things like per-cpu or per-thread variables, and
    that is not to extend the address space, but to avoid wasting precious
    _useful_ registers on that).

    Linus


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