From owner-freebsd-hackers Mon Jun 26 00:03:13 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id AAA28933 for hackers-outgoing; Mon, 26 Jun 1995 00:03:13 -0700 Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id AAA28923 for ; Mon, 26 Jun 1995 00:03:10 -0700 Received: from sax.sax.de by irz301.inf.tu-dresden.de with SMTP (5.67b+/DEC-Ultrix/4.3) id AA19052; Mon, 26 Jun 1995 09:03:07 +0200 Received: by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id JAA08430 for freebsd-hackers@freebsd.org; Mon, 26 Jun 1995 09:03:06 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.6.11/8.6.9) id IAA21939 for freebsd-hackers@freebsd.org; Mon, 26 Jun 1995 08:32:12 +0200 From: J Wunsch Message-Id: <199506260632.IAA21939@uriah.heep.sax.de> Subject: Re: 2.05R reboot hangs To: freebsd-hackers@freebsd.org (FreeBSD hackers) Date: Mon, 26 Jun 1995 08:32:12 +0200 (MET DST) Reply-To: freebsd-hackers@freebsd.org (FreeBSD hackers) In-Reply-To: <199506252253.IAA08952@godzilla.zeta.org.au> from "Bruce Evans" at Jun 26, 95 08:53:31 am Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) X-Phone: +49-351-2012 669 X-Mailer: ELM [version 2.4 PL23] Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Content-Length: 680 Sender: hackers-owner@freebsd.org Precedence: bulk As Bruce Evans wrote: > > >I seem to recall reading somewhere that there's a BIOS routine that > >can be used for rebooting the system. Now, I know using BIOS calls is a > > I couldn't find a standard one in the Interrupt List. There is INT 19h > for the bootstrap loader, but it is unusable even from DOS because it > doesn't unhook hooked vectors. I think that's what they're using. Viruses tend to survive warm boots for just this reason (they modify the int 0x19 vector to prevent the bootstrap routine from destroying them). -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ Never trust an operating system you don't have sources for. ;-)