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md_root.c revision 1.4 
      1 /*	$NetBSD: md_root.c,v 1.4 2001/11/28 05:55:34 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 1.4 2001/11/28 05:55:34 lukem Exp $");
     41 
     42 #include "opt_md.h"
     43 #include "opt_mdsize.h"
     44 
     45 #include <sys/param.h>
     46 #include <sys/systm.h>
     47 #include <sys/reboot.h>
     48 
     49 #include <dev/md.h>
     50 
     51 extern int boothowto;
     52 
     53 #ifdef MEMORY_DISK_DYNAMIC
     54 size_t md_root_size;
     55 char *md_root_image;
     56 #else /* MEMORY_DISK_DYNAMIC */
     57 
     58 #ifndef MINIROOTSIZE
     59 #define MINIROOTSIZE 512
     60 #endif
     61 #define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
     62 
     63 /*
     64  * This array will be patched to contain a file-system image.
     65  * See the program mdsetimage(8) for details.
     66  */
     67 u_int32_t md_root_size = ROOTBYTES;
     68 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
     69 #endif /* MEMORY_DISK_DYNAMIC */
     70 
     71 #ifdef MEMORY_DISK_DYNAMIC
     72 void
     73 md_root_setconf(char *addr, size_t size)
     74 {
     75 	md_root_image = addr;
     76 	md_root_size = size;
     77 }
     78 #endif /* MEMORY_DISK_DYNAMIC */
     79 
     80 /*
     81  * This is called during pseudo-device attachment.
     82  */
     83 void
     84 md_attach_hook(int unit, struct md_conf *md)
     85 {
     86 	char pbuf[9];
     87 
     88 	if (unit == 0) {
     89 		/* Setup root ramdisk */
     90 		md->md_addr = (caddr_t)md_root_image;
     91 		md->md_size = (size_t)md_root_size;
     92 		md->md_type = MD_KMEM_FIXED;
     93 		format_bytes(pbuf, sizeof(pbuf), md->md_size);
     94 		printf("md%d: internal %s image area\n", unit, pbuf);
     95 	}
     96 }
     97 
     98 /*
     99  * This is called during open (i.e. mountroot)
    100  */
    101 void
    102 md_open_hook(int unit, struct md_conf *md)
    103 {
    104 
    105 	if (unit == 0) {
    106 		/* The root ramdisk only works single-user. */
    107 		boothowto |= RB_SINGLE;
    108 	}
    109 }
    110