From: Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
To: Phillip Susi <psusi-3tLf1voIkJTQT0dZR+AlfA@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: vbetool on pure AMD64 system
Date: Mon, 14 Nov 2005 21:48:27 +0000 [thread overview]
Message-ID: <1132004907.16148.32.camel@localhost.localdomain> (raw)
In-Reply-To: <4378C318.9090105-3tLf1voIkJTQT0dZR+AlfA@public.gmane.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
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next prev parent reply other threads:[~2005-11-14 21:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-09 22:42 vbetool on pure AMD64 system Frank
[not found] ` <200511092342.40477.hugelmopf-S0/GAf8tV78@public.gmane.org>
2005-11-10 16:07 ` Matthew Garrett
2005-11-11 10:33 ` Pavel Machek
[not found] ` <20051111103315.GB27805-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2005-11-14 17:02 ` Phillip Susi
[not found] ` <4378C318.9090105-3tLf1voIkJTQT0dZR+AlfA@public.gmane.org>
2005-11-14 21:48 ` Alan Cox [this message]
[not found] ` <1132004907.16148.32.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2005-11-14 22:29 ` Carl-Daniel Hailfinger
2005-11-12 11:02 ` Erik Slagter
[not found] ` <1131793377.5267.6.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2005-11-12 12:09 ` Frank
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