linux-kernel - Re: [PATCH -mm] uvesafb: Don't access VGA registers directly when running on non-x86

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Date:	Wed, 12 Sep 2007 09:44:37 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Michal Januszewski <spock@...too.org>
Cc:	Paulo Marques <pmarques@...popie.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] uvesafb: Don't access VGA registers directly when running on non-x86

On Wed, Sep 12, 2007 at 01:09:59AM +0200, Michal Januszewski wrote:
> The VGA registers are only available at their legacy IO locations on x86.
> Don't try to access them when running on other arches.
> 
> Note that the code accessing them directly is just an optimization (limits
> slow BIOS function calls).  We don't lose any functionality by using
> BIOS calls instead of it on non-x86.
> 
If you do that, then you also have to #ifdef CONFIG_X86 around
video/vga.h, as that drags in asm/vga.h, which does not exist on all
platforms. I have little interest in adding a stub vga.h on my
architectures to support a driver that in practice works on nothing but
x86.
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