From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: vbetool on pure AMD64 system Date: Mon, 14 Nov 2005 21:48:27 +0000 Message-ID: <1132004907.16148.32.camel@localhost.localdomain> References: <200511092342.40477.hugelmopf@web.de> <20051111103315.GB27805@elf.ucw.cz> <4378C318.9090105@cfl.rr.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4378C318.9090105-3tLf1voIkJTQT0dZR+AlfA@public.gmane.org> Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Phillip Susi Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Llu, 2005-11-14 at 12:02 -0500, Phillip Susi wrote: > When you say that vm86 is not supported on x86-64, what do you mean > exactly? I'm pretty sure that the hardware supports it, and I don't see > how the vesa frame buffer Xorg driver works without it. If the hardware > supports v86 mode, why wouldn't the kernel? The hardware supports vm86 mode only if the OS is in 32bit mode. Its conceptually possible to support this in a 64bit OS but it would be very very hairy code and very hard to make secure or correct. Feel free to try it. Xorg has a software x86 emulator that is very basic but sufficient to boot most but not all video bioses on all sorts of systems. It uses that on x86-64. Alan ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php