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
mfs_initminiroot(void * base)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