From owner-freebsd-hackers Wed Jan 23 9:39:38 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mass.dis.org (dhcp45-21.dis.org [216.240.45.21]) by hub.freebsd.org (Postfix) with ESMTP id 290EE37B402 for ; Wed, 23 Jan 2002 09:39:35 -0800 (PST) Received: from mass.dis.org (localhost [127.0.0.1]) by mass.dis.org (8.11.6/8.11.6) with ESMTP id g0NHdkb00871; Wed, 23 Jan 2002 09:39:46 -0800 (PST) (envelope-from msmith@mass.dis.org) Message-Id: <200201231739.g0NHdkb00871@mass.dis.org> X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 To: Brian Reichert Cc: Greg Black , "Roger 'Rocky' Vetterberg" , Brooks Davis , hackers@freebsd.org Subject: Re: cpu info in userland In-reply-to: Your message of "Wed, 23 Jan 2002 11:39:09 EST." <20020123113909.P2872@numachi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 23 Jan 2002 09:39:46 -0800 From: Michael Smith Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > On Tue, Jan 22, 2002 at 05:47:00PM -0800, Michael Smith wrote: > > The message buffer is not perturbed by the boot process unless the BIOS > > overwrites it. If the BIOS doesn't overwrite it, it's preserved from one > > boot to the next. > > I'm confused then. Is this 'message buffer' not a construct of > the kernel? Where does it exist? It's just a region of memory; given an unchanged system configuration, it'll be in the same place every time you boot. The reason it's not cleared is simple; if the system crashes for some reason, and the crash message can't be written to disk (eg. it's a kernel trap, etc.), when the system reboots it will be picked up out of the message buffer and saved. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message