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It boots FreeBSD from a running MS-DOS system. It's compiled using some MS-DOS tools, but there is a binary hidden in the uuencoded file. (Go ahead, flame me if you can come up with a solution for the problem. Just saying "this is bad" doesn't count!) Rod, you were right: one would have to deal with weird interfaces to the memory managers, and it seems that Christian found them all, and made them work. Thanks Christian! Reviewed by: phk Submitted by: DI. Christian Gusenbauer <cg@fimp01.fim.uni-linz.ac.at> Christians README: ------------------ Hi Everybody! This is version 1.5 of "fbsdboot", a program that allows you to boot a kernel from a MS-DOS partition or a FreeBSD partition. This program runs using DOS. It works with various memory managers (like EMM386, 386MAX) under certain circumstances. First, a FreeBSD kernel is always loaded to memory starting at 0x100000. To assure that loading the kernel *does not* overwrite memory used by memory managers, high memory for the kernel is allocated and after loading the kernel it's moved to 0x100000. Second, there are many ways to switch to protected mode which is necessary to start the kernel. Each BIOS gives you the possibility to use INT15H (AH=89H) to do that. But some memory-managers like 386max does not allow you to use this method. An other way to do the switch is to use DPMI services, but they do not guarantee, that the protected mode application is executed with privilege level 0. Therefore this method is *not* used. VCPI services offer another way to switch to protected mode, and VCPI servers are built into "emm386.exe", "386max" and "qemm". That's why, this method is implemented in fbsdboot.exe. Fbsdboot.exe tries to switch to protected mode using VCPI services. If they're not available INT15H is used to do the switch. If that fails, it's not possible for this version of fbsdboot.exe to boot a kernel :-(. You can get commandline options of fbsdboot if you start it with "-?" as option! I don't know, if fbsdboot works with QEMM, as I don't have the possibility to test it. Enjoy and have fun! Christian. cg@fimp01.fim.uni-linz.ac.at PS: Many thanks to Bruce Evans for his assistance!
101 lines
4.0 KiB
C
101 lines
4.0 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)cdefs.h 8.1 (Berkeley) 6/2/93
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* $Id: cdefs.h,v 1.6 1993/10/16 17:16:24 rgrimes Exp $
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*/
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#ifndef _CDEFS_H_
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#define _CDEFS_H_
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#if defined(__cplusplus)
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#define __BEGIN_DECLS extern "C" {
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#define __END_DECLS };
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#else
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#define __BEGIN_DECLS
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#define __END_DECLS
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#endif
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/*
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* The __CONCAT macro is used to concatenate parts of symbol names, e.g.
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* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
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* The __CONCAT macro is a bit tricky -- make sure you don't put spaces
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* in between its arguments. __CONCAT can also concatenate double-quoted
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* strings produced by the __STRING macro, but this only works with ANSI C.
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*/
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#if defined(__STDC__) || defined(__cplusplus)
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#if defined(__P)
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#undef __P
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#endif /* defined(__P) */
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#define __P(protos) protos /* full-blown ANSI C */
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#define __CONCAT(x,y) x ## y
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#define __STRING(x) #x
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#else /* !(__STDC__ || __cplusplus) */
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#if defined(__P)
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#undef __P
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#endif /* defined(__P) */
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#define __P(protos) () /* traditional C preprocessor */
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#define __CONCAT(x,y) x/**/y
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#define __STRING(x) "x"
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/* delete ANSI C keywords */
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#define const
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#define inline
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#define signed
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#define volatile
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#endif /* !(__STDC__ || __cplusplus) */
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/*
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* GCC has extensions for declaring functions as const (`pure' - always returns
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* the same value given the same inputs, i.e., has no external state and
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* no side effects) and volatile (nonreturning or `dead').
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* These mainly affect optimization and warnings.
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*
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* To facilitate portability of a non-standard extension we define __pure
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* and __dead and use these for qualifying functions. Non-gcc compilers
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* which have similar extensions can then define these appropriately.
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*
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* Unfortunately, GCC complains if these are used under strict ANSI mode
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* (`gcc -ansi -pedantic'), hence we need to define them only if compiling
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* without this.
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*/
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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#define __dead __volatile
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#define __pure __const
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#else
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#define __dead
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#define __pure
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#endif
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#endif /* !_CDEFS_H_ */
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