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md_root.c revision 1.2 
      1 /*	$NetBSD: md_root.c,v 1.2 2001/07/02 17:17:25 uch 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 "opt_md.h"
     40 #include "opt_mdsize.h"
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/reboot.h>
     45 
     46 #include <dev/md.h>
     47 
     48 extern int boothowto;
     49 
     50 #if MEMORY_DISK_DYNAMIC
     51 size_t md_root_size;
     52 char *md_root_image;
     53 #else /* MEMORY_DISK_DYNAMIC */
     54 
     55 #ifndef MINIROOTSIZE
     56 #define MINIROOTSIZE 512
     57 #endif
     58 #define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
     59 
     60 /*
     61  * This array will be patched to contain a file-system image.
     62  * See the program mdsetimage(8) for details.
     63  */
     64 u_int32_t md_root_size = ROOTBYTES;
     65 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
     66 #endif /* MEMORY_DISK_DYNAMIC */
     67 
     68 #if MEMORY_DISK_DYNAMIC
     69 void
     70 md_root_setconf(char *addr, size_t size)
     71 {
     72 	md_root_image = addr;
     73 	md_root_size = size;
     74 }
     75 #endif /* MEMORY_DISK_DYNAMIC */
     76 
     77 /*
     78  * This is called during pseudo-device attachment.
     79  */
     80 void
     81 md_attach_hook(int unit, struct md_conf *md)
     82 {
     83 	char pbuf[9];
     84 
     85 	if (unit == 0) {
     86 		/* Setup root ramdisk */
     87 		md->md_addr = (caddr_t)md_root_image;
     88 		md->md_size = (size_t)md_root_size;
     89 		md->md_type = MD_KMEM_FIXED;
     90 		format_bytes(pbuf, sizeof(pbuf), md->md_size);
     91 		printf("md%d: internal %s image area\n", unit, pbuf);
     92 	}
     93 }
     94 
     95 /*
     96  * This is called during open (i.e. mountroot)
     97  */
     98 void
     99 md_open_hook(int unit, struct md_conf *md)
    100 {
    101 
    102 	if (unit == 0) {
    103 		/* The root ramdisk only works single-user. */
    104 		boothowto |= RB_SINGLE;
    105 	}
    106 }
    107