Date: Wed, 23 Jan 2002 09:39:46 -0800 From: Michael Smith <msmith@freebsd.org> To: Brian Reichert <reichert@numachi.com> Cc: Greg Black <gjb@gbch.net>, "Roger 'Rocky' Vetterberg" <listsub@rambo.simx.org>, Brooks Davis <brooks@one-eyed-alien.net>, hackers@freebsd.org Subject: Re: cpu info in userland Message-ID: <200201231739.g0NHdkb00871@mass.dis.org> In-Reply-To: Your message of "Wed, 23 Jan 2002 11:39:09 EST." <20020123113909.P2872@numachi.com>
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> 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
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