linux-kernel - Re: Regression: boot failure on AMD Elan TS-5500

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 1 Jul 2008 20:20:14 +0000
From:	Sean Young <sean@...s.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression: boot failure on AMD Elan TS-5500

On Tue, Jul 01, 2008 at 07:59:42PM +0000, Sean Young wrote:
> On Mon, Jun 30, 2008 at 03:42:47PM -0700, H. Peter Anvin wrote:
> > diff --git a/arch/x86/boot/pmjump.S b/arch/x86/boot/pmjump.S
> > index ab049d4..141b6e2 100644
> > --- a/arch/x86/boot/pmjump.S
> > +++ b/arch/x86/boot/pmjump.S
> > @@ -33,6 +33,8 @@ protected_mode_jump:
> >  	movw	%cs, %bx
> >  	shll	$4, %ebx
> >  	addl	%ebx, 2f
> > +	jmp	1f			# Short jump to serialize on 386/486
> > +1:
> >  
> >  	movw	$__BOOT_DS, %cx
> >  	movw	$__BOOT_TSS, %di
> > @@ -40,8 +42,6 @@ protected_mode_jump:
> >  	movl	%cr0, %edx
> >  	orb	$X86_CR0_PE, %dl	# Protected mode
> >  	movl	%edx, %cr0
> > -	jmp	1f			# Short jump to serialize on 386/486
> > -1:
> >  
> >  	# Transition to 32-bit mode
> >  	.byte	0x66, 0xea		# ljmpl opcode
> 
> I'm afraid it doesn't work. Maybe I can find something in the AMD Elan
> documentation. Would a fence make sense?

I was just trying to confirm this with postive and negative tests which 
is failing. I'm probably being an idiot, please let systematically test
this.

This does not seem like the heisenbug category, or is it?


Sean
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/