Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758093AbXFINIc (ORCPT ); Sat, 9 Jun 2007 09:08:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754621AbXFINIZ (ORCPT ); Sat, 9 Jun 2007 09:08:25 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:44853 "EHLO amd.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753916AbXFINIY (ORCPT ); Sat, 9 Jun 2007 09:08:24 -0400 Date: Sat, 9 Jun 2007 15:08:17 +0200 From: Pavel Machek To: Christian Leber , Andrew Morton , kernel list Subject: beeping patch for debugging acpi sleep Message-ID: <20070609130817.GI27793@elf.ucw.cz> References: <20070518213701.GA810@core> <20070520200142.GB5235@ucw.cz> <20070602182014.GB29546@core> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070602182014.GB29546@core> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1529 Lines: 54 Starting beeper as soon as ACPI sleep returns is very useful in debugging "apparently dead" machines. If it beeps at all, it makes sense to start playing with CMOS tracer. Signed-off-by: Pavel Machek diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S index b781b38..cbf136e 100644 --- a/arch/i386/kernel/acpi/wakeup.S +++ b/arch/i386/kernel/acpi/wakeup.S @@ -11,7 +11,22 @@ # Do we need to deal with A20? It is oka # # If physical address of wakeup_code is 0x12345, BIOS should call us with # cs = 0x1234, eip = 0x05 -# +# + +#define BEEP \ + inb $97, %al; \ + outb %al, $0x80; \ + movb $3, %al; \ + outb %al, $97; \ + outb %al, $0x80; \ + movb $-74, %al; \ + outb %al, $67; \ + outb %al, $0x80; \ + movb $-119, %al; \ + outb %al, $66; \ + outb %al, $0x80; \ + movb $15, %al; \ + outb %al, $66; ALIGN .align 4096 @@ -20,6 +35,9 @@ wakeup_code: wakeup_code_start = . .code16 +# 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) -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/