69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
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/* $NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $ */
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/*
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* Copyright (c) 1989, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $");
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#include <sys/param.h>
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#include <ufs/mfs/mfs_extern.h>
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#include <ufs/ffs/fs.h>
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void * mfs_rootbase; /* address of mini-root in kernel virtual memory */
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u_long mfs_rootsize; /* size of mini-root in bytes */
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/*
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* This is called early in boot to set the base address and size
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* of the mini-root.
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*/
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int
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mfs_initminiroot(void *base)
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{
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struct fs *fs = (struct fs *)((char *)base + SBLOCK_UFS1);
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static bool inited = false;
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if (inited)
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panic("mfs_initminiroot() called more than once");
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inited = true;
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/* check for valid super block */
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if (fs->fs_magic != FS_UFS1_MAGIC || fs->fs_bsize > MAXBSIZE ||
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fs->fs_bsize < sizeof(struct fs))
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return (0);
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rootfstype = MOUNT_MFS;
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mfs_rootbase = base;
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mfs_rootsize = fs->fs_fsize * fs->fs_size;
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rootdev = makedev(255, 0);
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return (mfs_rootsize);
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}
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