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