Messages in this thread Patch in this message | | | Date | Sat, 9 Jun 2007 15:08:17 +0200 | From | Pavel Machek <> | Subject | beeping patch for debugging acpi sleep |
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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 <pavel@suse.cz>
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/
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