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md_root.c revision 1.1 
      1 /*	$NetBSD: md_root.c,v 1.1 2000/10/02 15:22:32 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/reboot.h>
     42 
     43 #include <dev/md.h>
     44 
     45 #include "opt_mdsize.h"
     46 
     47 extern int boothowto;
     48 
     49 #ifndef MINIROOTSIZE
     50 #define MINIROOTSIZE 512
     51 #endif
     52 
     53 #define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
     54 
     55 /*
     56  * This array will be patched to contain a file-system image.
     57  * See the program mdsetimage(8) for details.
     58  */
     59 u_int32_t md_root_size = ROOTBYTES;
     60 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
     61 
     62 /*
     63  * This is called during pseudo-device attachment.
     64  */
     65 void
     66 md_attach_hook(unit, md)
     67 	int unit;
     68 	struct md_conf *md;
     69 {
     70 	char pbuf[9];
     71 
     72 	if (unit == 0) {
     73 		/* Setup root ramdisk */
     74 		md->md_addr = (caddr_t)md_root_image;
     75 		md->md_size = (size_t)md_root_size;
     76 		md->md_type = MD_KMEM_FIXED;
     77 		format_bytes(pbuf, sizeof(pbuf), ROOTBYTES);
     78 		printf("md%d: internal %s image area\n", unit, pbuf);
     79 	}
     80 }
     81 
     82 /*
     83  * This is called during open (i.e. mountroot)
     84  */
     85 void
     86 md_open_hook(unit, md)
     87 	int unit;
     88 	struct md_conf *md;
     89 {
     90 
     91 	if (unit == 0) {
     92 		/* The root ramdisk only works single-user. */
     93 		boothowto |= RB_SINGLE;
     94 	}
     95 }
     96