Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751671AbYJRWzQ (ORCPT ); Sat, 18 Oct 2008 18:55:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750955AbYJRWzE (ORCPT ); Sat, 18 Oct 2008 18:55:04 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:37697 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750878AbYJRWzB (ORCPT ); Sat, 18 Oct 2008 18:55:01 -0400 Date: Sat, 18 Oct 2008 15:53:48 -0700 (PDT) From: Linus Torvalds To: Jon Smirl cc: Ingo Molnar , Keith Packard , Nick Piggin , Dave Airlie , Linux Kernel Mailing List , dri-devel@lists.sf.net, Andrew Morton , Yinghai Lu Subject: Re: [git pull] drm patches for 2.6.27-rc1 In-Reply-To: <9e4733910810181547k98f2a02p82769c51975f5865@mail.gmail.com> Message-ID: References: <200810181237.49784.nickpiggin@yahoo.com.au> <1224357062.4384.72.camel@koto.keithp.com> <20081018203741.GA23396@elte.hu> <1224366690.4384.89.camel@koto.keithp.com> <20081018223214.GA5093@elte.hu> <9e4733910810181547k98f2a02p82769c51975f5865@mail.gmail.com> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 828 Lines: 22 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/