From owner-svn-src-all@FreeBSD.ORG Wed May 1 18:06:55 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 43E07F37; Wed, 1 May 2013 18:06:55 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id 1C00F1D20; Wed, 1 May 2013 18:06:55 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.6/8.14.6) with ESMTP id r41I6smE049919; Wed, 1 May 2013 18:06:54 GMT (envelope-from dim@svn.freebsd.org) Received: (from dim@localhost) by svn.freebsd.org (8.14.6/8.14.5/Submit) id r41I6sFO049917; Wed, 1 May 2013 18:06:54 GMT (envelope-from dim@svn.freebsd.org) Message-Id: <201305011806.r41I6sFO049917@svn.freebsd.org> From: Dimitry Andric Date: Wed, 1 May 2013 18:06:54 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r250151 - in stable: 6/sys/boot/i386/btx/btx 6/sys/boot/pc98/btx/btx 7/sys/boot/i386/btx/btx 7/sys/boot/pc98/btx/btx 8/sys/boot/i386/btx/btx 8/sys/boot/pc98/btx/btx 9/sys/boot/i386/btx/... X-SVN-Group: stable-8 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 May 2013 18:06:55 -0000 Author: dim Date: Wed May 1 18:06:53 2013 New Revision: 250151 URL: http://svnweb.freebsd.org/changeset/base/250151 Log: MFC r249846: When rebooting (exiting) from the BTX loader, make sure to restore the GDT from the correct segment, otherwise a triple fault would be caused. In some virtual environments (VMware, VirtualBox, etc) this could lead to a unhandled error or hang in the guest emulation software. Thanks to avg and jhb for a few hints in the right direction. Noticed by: Jeremy Chadwick (and many others) Modified: stable/8/sys/boot/i386/btx/btx/btx.S stable/8/sys/boot/pc98/btx/btx/btx.S Directory Properties: stable/8/sys/ (props changed) stable/8/sys/boot/ (props changed) Changes in other areas also in this revision: Modified: stable/6/sys/boot/i386/btx/btx/btx.S stable/6/sys/boot/pc98/btx/btx/btx.S stable/7/sys/boot/i386/btx/btx/btx.S stable/7/sys/boot/pc98/btx/btx/btx.S stable/9/sys/boot/i386/btx/btx/btx.S stable/9/sys/boot/pc98/btx/btx/btx.S Directory Properties: stable/6/sys/ (props changed) stable/7/sys/ (props changed) stable/9/sys/ (props changed) stable/9/sys/boot/ (props changed) Modified: stable/8/sys/boot/i386/btx/btx/btx.S ============================================================================== --- stable/8/sys/boot/i386/btx/btx/btx.S Wed May 1 17:59:41 2013 (r250150) +++ stable/8/sys/boot/i386/btx/btx/btx.S Wed May 1 18:06:53 2013 (r250151) @@ -248,7 +248,7 @@ exit: cli # Disable interrupts /* * Restore the GDT in case we caught a kernel trap. */ - lgdt gdtdesc # Set GDT + lgdt %cs:gdtdesc # Set GDT /* * To 16 bits. */ Modified: stable/8/sys/boot/pc98/btx/btx/btx.S ============================================================================== --- stable/8/sys/boot/pc98/btx/btx/btx.S Wed May 1 17:59:41 2013 (r250150) +++ stable/8/sys/boot/pc98/btx/btx/btx.S Wed May 1 18:06:53 2013 (r250151) @@ -248,7 +248,7 @@ exit: cli # Disable interrupts /* * Restore the GDT in case we caught a kernel trap. */ - lgdt gdtdesc # Set GDT + lgdt %cs:gdtdesc # Set GDT /* * To 16 bits. */