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md_root.c revision 1.6 
      1 /*	$NetBSD: md_root.c,v 1.6 2002/04/02 05:30:52 lukem 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/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.6 2002/04/02 05:30:52 lukem Exp $");
     41 
     42 #include "opt_md.h"
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/reboot.h>
     47 
     48 #include <dev/md.h>
     49 
     50 extern int boothowto;
     51 
     52 #ifdef MEMORY_DISK_DYNAMIC
     53 size_t md_root_size;
     54 char *md_root_image;
     55 #else /* MEMORY_DISK_DYNAMIC */
     56 
     57 #ifndef MEMORY_DISK_ROOT_SIZE
     58 #define MEMORY_DISK_ROOT_SIZE 512
     59 #endif
     60 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
     61 
     62 /*
     63  * This array will be patched to contain a file-system image.
     64  * See the program mdsetimage(8) for details.
     65  */
     66 u_int32_t md_root_size = ROOTBYTES;
     67 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
     68 #endif /* MEMORY_DISK_DYNAMIC */
     69 
     70 #ifdef MEMORY_DISK_DYNAMIC
     71 void
     72 md_root_setconf(char *addr, size_t size)
     73 {
     74 	md_root_image = addr;
     75 	md_root_size = size;
     76 }
     77 #endif /* MEMORY_DISK_DYNAMIC */
     78 
     79 /*
     80  * This is called during pseudo-device attachment.
     81  */
     82 void
     83 md_attach_hook(int unit, struct md_conf *md)
     84 {
     85 	char pbuf[9];
     86 
     87 	if (unit == 0) {
     88 		/* Setup root ramdisk */
     89 		md->md_addr = (caddr_t)md_root_image;
     90 		md->md_size = (size_t)md_root_size;
     91 		md->md_type = MD_KMEM_FIXED;
     92 		format_bytes(pbuf, sizeof(pbuf), md->md_size);
     93 		printf("md%d: internal %s image area\n", unit, pbuf);
     94 	}
     95 }
     96 
     97 /*
     98  * This is called during open (i.e. mountroot)
     99  */
    100 void
    101 md_open_hook(int unit, struct md_conf *md)
    102 {
    103 
    104 	if (unit == 0) {
    105 		/* The root ramdisk only works single-user. */
    106 		boothowto |= RB_SINGLE;
    107 	}
    108 }
    109