Messages in this thread | | | Date | Sat, 18 Oct 2008 15:53:48 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [git pull] drm patches for 2.6.27-rc1 |
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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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