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 | |