1 /* $NetBSD: blkdev.c,v 1.3 2003/08/07 16:29:24 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1999 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Van Jacobson of Lawrence Berkeley Laboratory and Ralph Campbell. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)rz.c 8.1 (Berkeley) 6/10/93 65 */ 66 67 #include <lib/libsa/stand.h> 68 #include <lib/libkern/libkern.h> 69 70 #include <sys/param.h> 71 #include <sys/disklabel.h> 72 73 #include "stand/common/cfe_api.h" 74 75 #include "stand/common/common.h" 76 #include "blkdev.h" 77 78 /* 79 * If BOOTXX_FS_TYPE is defined, we'll try to find and use the first 80 * partition with that type mentioned in the disklabel, else default to 81 * using block 0. 82 * 83 * The old boot blocks used to look for a file system starting at block 84 * 0. It's not immediately obvious that change here is necessary or good, 85 * so for now we don't bother looking for the specific type. 86 */ 87 #undef BOOTXX_FS_TYPE 88 89 int blkdev_is_open; 90 u_int32_t blkdev_part_offset; 91 92 /* 93 * Since we have only one device, and want to squeeze space, we just 94 * short-circuit devopen() to do the disk open as well. 95 * 96 * Devopen is supposed to decode the string 'fname', open the device, 97 * and make 'file' point to the remaining file name. Since we don't 98 * do any device munging, we can just set *file to fname. 99 */ 100 int 101 devopen(f, fname, file) 102 struct open_file *f; 103 const char *fname; 104 char **file; /* out */ 105 { 106 #if defined(BOOTXX_FS_TYPE) 107 int i; 108 size_t cnt; 109 char *msg, buf[DEV_BSIZE]; 110 struct disklabel l; 111 #endif /* defined(BOOTXX_FS_TYPE) */ 112 113 if (blkdev_is_open) { 114 return (EBUSY); 115 } 116 117 *file = (char *)fname; 118 119 #if 0 120 f->f_devdata = NULL; /* no point */ 121 #endif 122 123 /* Try to read disk label and partition table information. */ 124 blkdev_part_offset = 0; 125 #if defined(BOOTXX_FS_TYPE) 126 127 i = diskstrategy(NULL, F_READ, 128 (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt); 129 if (i || cnt != DEV_BSIZE) { 130 return (ENXIO); 131 } 132 msg = getdisklabel(buf, &l); 133 if (msg == NULL) { 134 /* 135 * there's a label. find the first partition of the 136 * type we want and use its offset. if none are 137 * found, we just use offset 0. 138 */ 139 for (i = 0; i < l.d_npartitions; i++) { 140 if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) { 141 blkdev_part_offset = l.d_partitions[i].p_offset; 142 break; 143 } 144 } 145 } else { 146 /* just use offset 0; it's already set that way */ 147 } 148 #endif /* defined(BOOTXX_FS_TYPE) */ 149 150 blkdev_is_open = 1; 151 return (0); 152 } 153 154 int 155 blkdevstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt) 156 void *devdata; 157 int rw; 158 daddr_t bn; 159 size_t reqcnt; 160 void *addrvoid; 161 size_t *cnt; /* out: number of bytes transfered */ 162 { 163 char *addr = addrvoid; 164 int res; 165 166 #if !defined(LIBSA_NO_TWIDDLE) 167 twiddle(); 168 #endif 169 170 /* Partial-block transfers not handled. */ 171 if (reqcnt & (DEV_BSIZE - 1)) { 172 *cnt = 0; 173 return (EINVAL); 174 } 175 res = cfe_readblk(booted_dev_fd,(bn+blkdev_part_offset)*DEV_BSIZE,addr,reqcnt); 176 if (res < 0) return EIO; 177 178 *cnt = res; 179 return (0); 180 } 181 182 #if !defined(LIBSA_NO_FS_CLOSE) 183 int 184 blkdevclose(struct open_file *f) 185 { 186 187 blkdev_is_open = 0; 188 return (0); 189 } 190 #endif /* !defined(LIBSA_NO_FS_CLOSE) */ 191