1 /* $NetBSD: md_root.c,v 1.10 2003/04/29 01:52:59 thorpej 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 1.10 2003/04/29 01:52:59 thorpej 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 #ifdef MEMORY_DISK_IMAGE 54 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE 55 #endif 56 size_t md_root_size; 57 char *md_root_image; 58 #else /* MEMORY_DISK_DYNAMIC */ 59 60 #ifdef MEMORY_DISK_IMAGE 61 #ifdef MEMORY_DISK_ROOT_SIZE 62 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE 63 #endif 64 char md_root_image[] = { 65 #include "md_root_image.h" 66 }; 67 u_int32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1); 68 69 #else /* MEMORY_DISK_IMAGE */ 70 71 #ifndef MEMORY_DISK_ROOT_SIZE 72 #define MEMORY_DISK_ROOT_SIZE 512 73 #endif 74 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT) 75 76 /* 77 * This array will be patched to contain a file-system image. 78 * See the program mdsetimage(8) for details. 79 */ 80 u_int32_t md_root_size = ROOTBYTES; 81 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n"; 82 #endif /* MEMORY_DISK_IMAGE */ 83 #endif /* MEMORY_DISK_DYNAMIC */ 84 85 #ifndef MEMORY_RBFLAGS 86 #define MEMORY_RBFLAGS RB_SINGLE /* force single user */ 87 #endif 88 89 #ifdef MEMORY_DISK_DYNAMIC 90 void 91 md_root_setconf(char *addr, size_t size) 92 { 93 md_root_image = addr; 94 md_root_size = size; 95 } 96 #endif /* MEMORY_DISK_DYNAMIC */ 97 98 /* 99 * This is called during pseudo-device attachment. 100 */ 101 void 102 md_attach_hook(int unit, struct md_conf *md) 103 { 104 char pbuf[9]; 105 106 if (unit == 0) { 107 /* Setup root ramdisk */ 108 md->md_addr = (caddr_t)md_root_image; 109 md->md_size = (size_t)md_root_size; 110 md->md_type = MD_KMEM_FIXED; 111 format_bytes(pbuf, sizeof(pbuf), md->md_size); 112 aprint_normal("md%d: internal %s image area\n", unit, pbuf); 113 } 114 } 115 116 /* 117 * This is called during open (i.e. mountroot) 118 */ 119 void 120 md_open_hook(int unit, struct md_conf *md) 121 { 122 123 if (unit == 0) { 124 /* The root ramdisk only works single-user. */ 125 boothowto |= MEMORY_RBFLAGS; 126 } 127 } 128