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      1 /*	$NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1990, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)mfs_vfsops.c	8.11 (Berkeley) 6/19/95
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $");
     36 
     37 #include <sys/param.h>
     38 
     39 #include <ufs/mfs/mfs_extern.h>
     40 #include <ufs/ffs/fs.h>
     41 
     42 void *	mfs_rootbase;	/* address of mini-root in kernel virtual memory */
     43 u_long	mfs_rootsize;	/* size of mini-root in bytes */
     44 
     45 /*
     46  * This is called early in boot to set the base address and size
     47  * of the mini-root.
     48  */
     49 int
     50 mfs_initminiroot(void *base)
     51 {
     52 	struct fs *fs = (struct fs *)((char *)base + SBLOCK_UFS1);
     53 	static bool inited = false;
     54 
     55 	if (inited)
     56 		panic("mfs_initminiroot() called more than once");
     57 	inited = true;
     58 
     59 	/* check for valid super block */
     60 	if (fs->fs_magic != FS_UFS1_MAGIC || fs->fs_bsize > MAXBSIZE ||
     61 	    fs->fs_bsize < sizeof(struct fs))
     62 		return (0);
     63 	rootfstype = MOUNT_MFS;
     64 	mfs_rootbase = base;
     65 	mfs_rootsize = fs->fs_fsize * fs->fs_size;
     66 	rootdev = makedev(255, 0);
     67 	return (mfs_rootsize);
     68 }
     69