1/*	$NetBSD$	*/
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, "$NetBSD$");
36
37#include <sys/param.h>
38
39#include <ufs/mfs/mfs_extern.h>
40#include <ufs/ffs/fs.h>
41
42void *	mfs_rootbase;	/* address of mini-root in kernel virtual memory */
43u_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 */
49int
50mfs_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