linux-kernel - Re: [git pull] drm patches for 2.6.27-rc1

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Date:	Sat, 18 Oct 2008 15:53:48 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jon Smirl <jonsmirl@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, Keith Packard <keithp@...thp.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sf.net, Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [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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