1 /* $NetBSD: md_root.c,v 1.7 2003/02/03 23:02:43 matt 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 1.7 2003/02/03 23:02:43 matt 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 #ifndef MEMORY_RBFLAGS 63 #define MEMORY_RBFLAGS RB_SINGLE /* force single user */ 64 #endif 65 66 /* 67 * This array will be patched to contain a file-system image. 68 * See the program mdsetimage(8) for details. 69 */ 70 u_int32_t md_root_size = ROOTBYTES; 71 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n"; 72 #endif /* MEMORY_DISK_DYNAMIC */ 73 74 #ifdef MEMORY_DISK_DYNAMIC 75 void 76 md_root_setconf(char *addr, size_t size) 77 { 78 md_root_image = addr; 79 md_root_size = size; 80 } 81 #endif /* MEMORY_DISK_DYNAMIC */ 82 83 /* 84 * This is called during pseudo-device attachment. 85 */ 86 void 87 md_attach_hook(int unit, struct md_conf *md) 88 { 89 char pbuf[9]; 90 91 if (unit == 0) { 92 /* Setup root ramdisk */ 93 md->md_addr = (caddr_t)md_root_image; 94 md->md_size = (size_t)md_root_size; 95 md->md_type = MD_KMEM_FIXED; 96 format_bytes(pbuf, sizeof(pbuf), md->md_size); 97 printf("md%d: internal %s image area\n", unit, pbuf); 98 } 99 } 100 101 /* 102 * This is called during open (i.e. mountroot) 103 */ 104 void 105 md_open_hook(int unit, struct md_conf *md) 106 { 107 108 if (unit == 0) { 109 /* The root ramdisk only works single-user. */ 110 boothowto |= MEMORY_RBFLAGS; 111 } 112 } 113