linux-kernel - Re: [rft] Kill junk from s2ram resume paths

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Message-ID: <20070731131814.GI2087@elf.ucw.cz>
Date:	Tue, 31 Jul 2007 15:18:16 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	suspend-devel@...ts.sourceforge.net, seife@...e.de
Subject: Re: [rft] Kill junk from s2ram resume paths

Hi!

> > This removes some stale debugging infrastructure from s2ram
> > paths. Also, there's no need to verify_cpu on x86-64 -- cpu can't
> > change during s2ram, and removed #if 0-ed code. Some testing would be
> > useful, perpahs it will even fix someone's machine :-). (VGA accesses
> > could theoretically hurt if vga is not present / if it is in some
> > strange state).
> > 
> > Signed-off-by: Pavel Machek <pavel@...e.cz>
> > 
> > diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S
> > index 1415da1..9719bd6 100644
> > --- a/arch/i386/kernel/acpi/wakeup.S
> > +++ b/arch/i386/kernel/acpi/wakeup.S
> > @@ -53,9 +38,6 @@ wakeup_code:
> >  # Uncomment this to make your computer start producing ugly noise as soon
> >  # as BIOS returns to this real-mode entry point.
> >  #	BEEP
> > - 	movw	$0xb800, %ax
> > -	movw	%ax,%fs
> > -	movw	$0x0e00 + 'L', %fs:(0x10)
> 
> Hmm, was this a part of that yellow "Linux" string?

Yes. But I'm afraid that may cause problems if vga is not ready.

> >  # Running in *copy* of this code, somewhere in low 1MB.
> >  
> > -	movb	$0xa1, %al	;  outb %al, $0x80
> 
> Well, what was this for?

Debugging leds on port 80. I still have that card somewhere
:-). Interesting parties can reinsert it.

> > @@ -88,8 +82,6 @@ # Running in *copy* of this code, somewh
> >  	movw	%ax,%fs
> >  	movw	$0x0e00 + 'L', %fs:(0x10)
> 
> Why aren't you removing this line?

Mistake, killed.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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