| 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 | |