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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!
209 lines
7.9 KiB
C
209 lines
7.9 KiB
C
/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Robert Elz at The University of Melbourne.
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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: @(#)quota.h 7.9 (Berkeley) 2/22/91
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* $Id: quota.h,v 1.3 1993/11/25 01:38:27 wollman Exp $
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*/
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#ifndef _QUOTA_
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#define _QUOTA_
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/*
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* Definitions for disk quotas imposed on the average user
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* (big brother finally hits UNIX).
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*
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* The following constants define the amount of time given a user
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* before the soft limits are treated as hard limits (usually resulting
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* in an allocation failure). The timer is started when the user crosses
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* their soft limit, it is reset when they go below their soft limit.
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*/
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#define MAX_IQ_TIME (7*24*60*60) /* 1 week */
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#define MAX_DQ_TIME (7*24*60*60) /* 1 week */
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/*
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* The following constants define the usage of the quota file array
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* in the ufsmount structure and dquot array in the inode structure.
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* The semantics of the elements of these arrays are defined in the
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* routine getinoquota; the remainder of the quota code treats them
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* generically and need not be inspected when changing the size of
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* the array.
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*/
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enum quotatype {
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USRQUOTA = 0, /* element used for user quotas */
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GRPQUOTA = 1, /* element used for group quotas */
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MAXQUOTAS = 2
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};
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/*
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* Definitions for the default names of the quotas files.
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*/
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#define INITQFNAMES { \
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"user", /* USRQUOTA */ \
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"group", /* GRPQUOTA */ \
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"undefined", \
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};
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#define QUOTAFILENAME "quota"
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#define QUOTAGROUP "operator"
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/*
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* Command definitions for the 'quotactl' system call.
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* The commands are broken into a main command defined below
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* and a subcommand that is used to convey the type of
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* quota that is being manipulated (see above).
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*/
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#define SUBCMDMASK 0x00ff
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#define SUBCMDSHIFT 8
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#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
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#define Q_QUOTAON 0x0100 /* enable quotas */
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#define Q_QUOTAOFF 0x0200 /* disable quotas */
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#define Q_GETQUOTA 0x0300 /* get limits and usage */
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#define Q_SETQUOTA 0x0400 /* set limits and usage */
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#define Q_SETUSE 0x0500 /* set usage */
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#define Q_SYNC 0x0600 /* sync disk copy of a filesystems quotas */
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/*
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* The following structure defines the format of the disk quota file
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* (as it appears on disk) - the file is an array of these structures
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* indexed by user or group number. The setquota system call establishes
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* the vnode for each quota file (a pointer is retained in the ufsmount
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* structure).
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*/
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struct dqblk {
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u_long dqb_bhardlimit; /* absolute limit on disk blks alloc */
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u_long dqb_bsoftlimit; /* preferred limit on disk blks */
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u_long dqb_curblocks; /* current block count */
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u_long dqb_ihardlimit; /* maximum # allocated inodes + 1 */
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u_long dqb_isoftlimit; /* preferred inode limit */
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u_long dqb_curinodes; /* current # allocated inodes */
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time_t dqb_btime; /* time limit for excessive disk use */
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time_t dqb_itime; /* time limit for excessive files */
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};
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#ifdef KERNEL
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/*
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* The following structure records disk usage for a user or group on a
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* filesystem. There is one allocated for each quota that exists on any
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* filesystem for the current user or group. A cache is kept of recently
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* used entries.
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*/
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struct dquot {
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struct dquot *dq_forw, *dq_back;/* MUST be first entry */
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struct dquot *dq_freef, **dq_freeb; /* free list */
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short dq_flags; /* flags, see below */
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short dq_cnt; /* count of active references */
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short dq_spare; /* unused spare padding */
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short dq_type; /* quota type of this dquot */
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u_long dq_id; /* identifier this applies to */
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struct ufsmount *dq_ump; /* filesystem that this is taken from */
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struct dqblk dq_dqb; /* actual usage & quotas */
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};
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/*
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* Flag values.
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*/
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#define DQ_LOCK 0x01 /* this quota locked (no MODS) */
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#define DQ_WANT 0x02 /* wakeup on unlock */
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#define DQ_MOD 0x04 /* this quota modified since read */
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#define DQ_FAKE 0x08 /* no limits here, just usage */
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#define DQ_BLKS 0x10 /* has been warned about blk limit */
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#define DQ_INODS 0x20 /* has been warned about inode limit */
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/*
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* Shorthand notation.
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*/
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#define dq_bhardlimit dq_dqb.dqb_bhardlimit
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#define dq_bsoftlimit dq_dqb.dqb_bsoftlimit
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#define dq_curblocks dq_dqb.dqb_curblocks
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#define dq_ihardlimit dq_dqb.dqb_ihardlimit
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#define dq_isoftlimit dq_dqb.dqb_isoftlimit
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#define dq_curinodes dq_dqb.dqb_curinodes
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#define dq_btime dq_dqb.dqb_btime
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#define dq_itime dq_dqb.dqb_itime
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/*
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* If the system has never checked for a quota for this file,
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* then it is set to NODQUOT. Once a write attempt is made
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* the inode pointer is set to reference a dquot structure.
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*/
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#define NODQUOT ((struct dquot *) 0)
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/*
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* Flags to chkdq() and chkiq()
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*/
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#define FORCE 0x01 /* force usage changes independent of limits */
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#define CHOWN 0x02 /* (advisory) change initiated by chown */
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/*
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* Macros to avoid subroutine calls to trivial functions.
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*/
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#ifndef DIAGNOSTIC
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#define DQREF(dq) (dq)->dq_cnt++
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#else
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#define DQREF(dq) dqref(dq)
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#endif /* DIAGNOSTIC */
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struct inode; struct ucred; struct mount; struct vnode;
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int getinoquota(struct inode *);
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int chkdq(struct inode *, long, struct ucred *, int);
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int chkdqchg(struct inode *, long, struct ucred *, enum quotatype);
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int chkiq(struct inode *, long, struct ucred *, int);
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int chkiqchg(struct inode *, long, struct ucred *, enum quotatype);
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#ifdef DIAGNOSTIC
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void chkdquot(struct inode *);
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#endif
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int quotaon(struct proc *, struct mount *, enum quotatype, caddr_t);
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int quotaoff(struct proc *, struct mount *, enum quotatype);
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int getquota(struct mount *, u_long, enum quotatype, caddr_t);
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int setquota(struct mount *, u_long, enum quotatype, caddr_t);
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int setuse(struct mount *, u_long, enum quotatype, caddr_t);
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int qsync(struct mount *);
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void dqinit(void);
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int dqget(struct vnode *, u_long, struct ufsmount *, enum quotatype, struct dquot **);
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void dqref(struct dquot *);
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void dqrele(struct vnode *, struct dquot *);
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int dqsync(struct vnode *, struct dquot *);
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void dqflush(struct vnode *);
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#else
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#include "cdefs.h"
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__BEGIN_DECLS
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int quotactl __P((const char *, int, int, void *));
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__END_DECLS
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#endif /* KERNEL */
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#endif /* _QUOTA_ */
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