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