NetBSD/sys/dev/md_root.c

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/* $NetBSD: md_root.c,v 1.4 2001/11/28 05:55:34 lukem Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.4 2001/11/28 05:55:34 lukem Exp $");
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#include "opt_md.h"
#include "opt_mdsize.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <dev/md.h>
extern int boothowto;
#ifdef MEMORY_DISK_DYNAMIC
size_t md_root_size;
char *md_root_image;
#else /* MEMORY_DISK_DYNAMIC */
#ifndef MINIROOTSIZE
#define MINIROOTSIZE 512
#endif
#define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
/*
* This array will be patched to contain a file-system image.
* See the program mdsetimage(8) for details.
*/
u_int32_t md_root_size = ROOTBYTES;
char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
#endif /* MEMORY_DISK_DYNAMIC */
#ifdef MEMORY_DISK_DYNAMIC
void
md_root_setconf(char *addr, size_t size)
{
md_root_image = addr;
md_root_size = size;
}
#endif /* MEMORY_DISK_DYNAMIC */
/*
* This is called during pseudo-device attachment.
*/
void
md_attach_hook(int unit, struct md_conf *md)
{
char pbuf[9];
if (unit == 0) {
/* Setup root ramdisk */
md->md_addr = (caddr_t)md_root_image;
md->md_size = (size_t)md_root_size;
md->md_type = MD_KMEM_FIXED;
format_bytes(pbuf, sizeof(pbuf), md->md_size);
printf("md%d: internal %s image area\n", unit, pbuf);
}
}
/*
* This is called during open (i.e. mountroot)
*/
void
md_open_hook(int unit, struct md_conf *md)
{
if (unit == 0) {
/* The root ramdisk only works single-user. */
boothowto |= RB_SINGLE;
}
}