From owner-freebsd-hackers@FreeBSD.ORG  Tue Apr 23 17:32:37 2013
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@FreeBSD.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id E69291D2;
 Tue, 23 Apr 2013 17:32:37 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
 by mx1.freebsd.org (Postfix) with ESMTP id CD50512B5;
 Tue, 23 Apr 2013 17:32:36 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
 [212.40.38.101])
 by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id UAA19803;
 Tue, 23 Apr 2013 20:32:35 +0300 (EEST)
 (envelope-from avg@FreeBSD.org)
Message-ID: <5176C5B2.3050409@FreeBSD.org>
Date: Tue, 23 Apr 2013 20:32:34 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:17.0) Gecko/20130404 Thunderbird/17.0.5
MIME-Version: 1.0
To: Dimitry Andric <dim@FreeBSD.org>, John Baldwin <jhb@FreeBSD.org>
Subject: Re: Rebooting from loader causes a "fault" in VMware Workstation
References: <20130419162834.GA90217@icarus.home.lan>
 <20130420014821.GA98555@icarus.home.lan> <5172812A.10309@gmail.com>
 <201304221129.43119.jhb@freebsd.org>
 <006B20F1-F67B-4E9D-B0DF-D4ED843F7E8E@FreeBSD.org>
 <5176B238.7030306@FreeBSD.org>
In-Reply-To: <5176B238.7030306@FreeBSD.org>
X-Enigmail-Version: 1.5.1
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@FreeBSD.org
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 23 Apr 2013 17:32:38 -0000

on 23/04/2013 19:09 Andriy Gapon said the following:
> ----------------
> IN:
> 0x00000000000090d2:  cli
> 0x00000000000090d3:  mov    $0x1800,%esp
> 0x00000000000090d8:  mov    %cr0,%eax
> 0x00000000000090db:  and    $0x7fffffff,%eax
> 0x00000000000090e0:  mov    %eax,%cr0
> 
> ----------------
> IN:
> 0x00000000000090e3:  xor    %ecx,%ecx
> 0x00000000000090e5:  mov    %ecx,%cr3
> 
> ----------------
> IN:
> 0x00000000000090e8:  lgdtl  0x95d0
> 0x00000000000090ef:  ljmpw  $0x18,$0x90f5

Perhaps the problem is that lgdt is called after disabling paging?

> Triple fault
> CPU Reset (CPU 0)
> ESI=0004503c EDI=3fe50968 EBP=00094a80 ESP=00001800
> EIP=000090ef EFL=00000046 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0033 0000a000 ffffffff 00cff300 DPL=3 DS   [-WA]
> CS =0008 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]
> SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
> DS =0033 0000a000 ffffffff 00cff300 DPL=3 DS   [-WA]
> FS =0033 0000a000 ffffffff 00cff300 DPL=3 DS   [-WA]
> GS =0033 0000a000 ffffffff 00cff300 DPL=3 DS   [-WA]
> LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
> TR =0038 00005f98 00002067 00008900 DPL=0 TSS32-avl
> GDT=     ff85c789 00000000
> IDT=     00005e00 00000197
> CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> CCS=00000001 CCD=00000000 CCO=LOGICL
> EFER=0000000000000000
> 


-- 
Andriy Gapon