linux-kernel - Re: video resume stuff

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Message-ID: <20071005073238.GA19065@atrey.karlin.mff.cuni.cz>
Date:	Fri, 5 Oct 2007 09:32:38 +0200
From:	Pavel Machek <pavel@....cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>, jikos@...os.cz,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: video resume stuff

Hi!

> >I'm thinking about how to clean up video resume/how to get it to work
> >for non-VESA video modes (jikos' case).
> >
> >I guess the cleanest solution would be to just call set_mode from
> >wakeup.S.... but that is not as easy as I imagined, because bootup
> >code seems to be compiled separately.
> >
> >Is there some easy way to retain bootup code in memory, so that wakeup
> >can use it? Or is there some easy solution I'm missing?
> 
> No, not really.  The setup code is not even part of the kernel binary 
> proper, and may not even have been run under certain circumstances.
> 
> The "easy" solution is to link it in again, which seems to be what 
> you're doing.  Now, currently the boot code is compiled after vmlinux is 
> complete, so some of the build ordering would have to be changed and/or 
> some of the code rearranged.

I guess major change is to rename conflicting symbols, so that it is
possible to link it twice. That would mean boot_memset() instead of
memset() etc... Is that acceptable?

> I suggest we tackle this *after* the x86 merge.

Well, we still have the regression on jikos' strange system, and I
would like to understand what is going on there.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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