blkdev.c revision 1.2
1 /* $NetBSD: blkdev.c,v 1.2 1999/11/12 13:11:40 simonb 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. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * @(#)rz.c 8.1 (Berkeley) 6/10/93 69 */ 70 71 #include <lib/libsa/stand.h> 72 73 #include <sys/param.h> 74 #include <sys/disklabel.h> 75 76 #include <machine/prom.h> 77 78 #include "stand/common/common.h" 79 #include "blkdev.h" 80 81 /* 82 * If BOOTXX_FS_TYPE is defined, we'll try to find and use the first 83 * partition with that type mentioned in the disklabel, else default to 84 * using block 0. 85 * 86 * The old boot blocks used to look for a file system starting at block 87 * 0. It's not immediately obvious that change here is necessary or good, 88 * so for now we don't bother looking for the specific type. 89 */ 90 #undef BOOTXX_FS_TYPE 91 92 int blkdev_is_open; 93 u_int32_t blkdev_part_offset; 94 95 /* 96 * Since we have only one device, and want to squeeze space, we just 97 * short-circuit devopen() to do the disk open as well. 98 * 99 * Devopen is supposed to decode the string 'fname', open the device, 100 * and make 'file' point to the remaining file name. Since we don't 101 * do any device munging, we can just set *file to fname. 102 */ 103 int 104 devopen(f, fname, file) 105 struct open_file *f; 106 const char *fname; 107 char **file; /* out */ 108 { 109 #if defined(BOOTXX_FS_TYPE) 110 int i; 111 size_t cnt; 112 char *msg, buf[DEV_BSIZE]; 113 struct disklabel l; 114 #endif /* defined(BOOTXX_FS_TYPE) */ 115 116 if (blkdev_is_open) 117 return (EBUSY); 118 119 *file = (char *)fname; 120 121 #if 0 122 f->f_devdata = NULL; /* no point */ 123 #endif 124 125 /* Try to read disk label and partition table information. */ 126 blkdev_part_offset = 0; 127 #if defined(BOOTXX_FS_TYPE) 128 i = diskstrategy(NULL, F_READ, 129 (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt); 130 if (i || cnt != DEV_BSIZE) { 131 return (ENXIO); 132 } 133 msg = getdisklabel(buf, &l); 134 if (msg == NULL) { 135 /* 136 * there's a label. find the first partition of the 137 * type we want and use its offset. if none are 138 * found, we just use offset 0. 139 */ 140 for (i = 0; i < l.d_npartitions; i++) { 141 if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) { 142 blkdev_part_offset = l.d_partitions[i].p_offset; 143 break; 144 } 145 } 146 } else { 147 /* just use offset 0; it's already set that way */ 148 } 149 #endif /* defined(BOOTXX_FS_TYPE) */ 150 151 blkdev_is_open = 1; 152 return (0); 153 } 154 155 int 156 blkdevstrategy(devdata, rw, bn, reqcnt, addrvoid, cnt) 157 void *devdata; 158 int rw; 159 daddr_t bn; 160 size_t reqcnt; 161 void *addrvoid; 162 size_t *cnt; /* out: number of bytes transfered */ 163 { 164 char *addr = addrvoid; 165 prom_return_t ret; 166 167 if ((reqcnt & 0xffffff) != reqcnt || 168 reqcnt == 0) 169 asm("call_pal 0"); 170 171 twiddle(); 172 173 /* Partial-block transfers not handled. */ 174 if (reqcnt & (DEV_BSIZE - 1)) { 175 *cnt = 0; 176 return (EINVAL); 177 } 178 179 ret.bits = prom_read(booted_dev_fd, reqcnt, addr, 180 bn + blkdev_part_offset); 181 if (ret.u.status) 182 return (EIO); 183 *cnt = ret.u.retval; 184 return (0); 185 } 186 187 #if !defined(LIBSA_NO_FS_CLOSE) 188 int 189 blkdevclose(struct open_file *f) 190 { 191 192 blkdev_is_open = 0; 193 return (0); 194 } 195 #endif /* !defined(LIBSA_NO_FS_CLOSE) */ 196
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