/*      $NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $   */

/*
* Copyright (c) 1989, 1990, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)mfs_vfsops.c        8.11 (Berkeley) 6/19/95
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mfs_miniroot.c,v 1.1 2010/03/02 17:20:02 pooka Exp $");

#include <sys/param.h>

#include <ufs/mfs/mfs_extern.h>
#include <ufs/ffs/fs.h>

void *  mfs_rootbase;   /* address of mini-root in kernel virtual memory */
u_long  mfs_rootsize;   /* size of mini-root in bytes */

/*
* This is called early in boot to set the base address and size
* of the mini-root.
*/
int
mfs_initminiroot(void *base)
{
       struct fs *fs = (struct fs *)((char *)base + SBLOCK_UFS1);
       static bool inited = false;

       if (inited)
               panic("mfs_initminiroot() called more than once");
       inited = true;

       /* check for valid super block */
       if (fs->fs_magic != FS_UFS1_MAGIC || fs->fs_bsize > MAXBSIZE ||
           fs->fs_bsize < sizeof(struct fs))
               return (0);
       rootfstype = MOUNT_MFS;
       mfs_rootbase = base;
       mfs_rootsize = fs->fs_fsize * fs->fs_size;
       rootdev = makedev(255, 0);
       return (mfs_rootsize);
}