From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757941AbXHVH4V (ORCPT ); Wed, 22 Aug 2007 03:56:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754970AbXHVH4O (ORCPT ); Wed, 22 Aug 2007 03:56:14 -0400 Received: from wenus.cyberbajt.pl ([195.205.217.180]:59823 "EHLO wenus.cyberbajt.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754666AbXHVH4O (ORCPT ); Wed, 22 Aug 2007 03:56:14 -0400 X-Greylist: delayed 401 seconds by postgrey-1.27 at vger.kernel.org; Wed, 22 Aug 2007 03:56:12 EDT Date: Wed, 22 Aug 2007 09:49:15 +0200 From: =?UTF-8?B?UmFmYcWC?= Maj To: linux-kernel@vger.kernel.org Subject: Calling BIOS interrupt from kernel (and debugging / reverse engeneering) Message-ID: <20070822094915.41afa2af@lore.lcone> Organization: LimCore.com X-Mailer: Sylpheed-Claws 2.6.0 (GTK+ 2.8.20; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, I know it is not good to call BIOS interrupt from Linux (kernel nor userspace) and we should use I/O ports instead; But, is it at all doable? To call a BIOS interrupt from Linux kernel? If so then how to? In example, say we have not documented device returning data in AL after call to interrupt 0x15 with AX=0x1234 for example; And we want to use this BIOS interrupt and then printk() returned value in AL. AFAIK vm86() is one step to do it, but its hard to find good complete example at least for me. Btw, is it possible to reverse engineering such a BIOS call? Besides using some hardware-debugger of bus etc. Thanks