From owner-cvs-sys Fri Mar 8 04:43:25 1996 Return-Path: owner-cvs-sys Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id EAA10869 for cvs-sys-outgoing; Fri, 8 Mar 1996 04:43:25 -0800 (PST) Received: from Root.COM (implode.Root.COM [198.145.90.17]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id EAA10863 Fri, 8 Mar 1996 04:43:23 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by Root.COM (8.6.12/8.6.5) with SMTP id EAA00945; Fri, 8 Mar 1996 04:43:47 -0800 Message-Id: <199603081243.EAA00945@Root.COM> X-Authentication-Warning: implode.Root.COM: Host localhost didn't use HELO protocol To: Bruce Evans cc: CVS-committers@freefall.freebsd.org, cvs-all@freefall.freebsd.org, cvs-sys@freefall.freebsd.org Subject: Re: cvs commit: src/sys/i386/boot/biosboot asm.S table.c In-reply-to: Your message of "Thu, 07 Mar 1996 21:15:57 PST." <199603080515.VAA11487@freefall.freebsd.org> From: David Greenman Reply-To: davidg@Root.COM Date: Fri, 08 Mar 1996 04:43:47 -0800 Sender: owner-cvs-sys@FreeBSD.ORG X-Loop: owner-cvs-sys@FreeBSD.ORG Precedence: bulk >bde 96/03/07 21:15:56 > > Modified: sys/i386/boot/biosboot asm.S table.c > Log: > Fixed restoring segment descriptors in prot_to_real(). The descriptors > must have limit 0xffff and attribute G = 0 (byte granularity) as well > as other properties that they already had (see e.g., the Intel i486 > manual section 22.5). Not restoring them broke Ctrl-Alt-Del in the > bootstrap for my ASUS P55TP4XE system, probably because the Award BIOS > does anti-tracing stuff involving inaccessible %esp's. > > asm.S: > Don't use lret in prot_to_real(). This reduces the risk of using an > incompletely intialized stack segment and saves space. > > Submitted by: "K.Higashino" (on 13 Jan 1995!) > reworked by me This should be brought into -stable. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project