1/* $NetBSD: blkdev.c,v 1.5 2009/01/12 07:30:45 tsutsui 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 89int blkdev_is_open; 90u_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 */ 100int 101devopen(struct open_file *f, const char *fname, char **file) 102 /* file: out */ 103{ 104#if defined(BOOTXX_FS_TYPE) 105 int i; 106 size_t cnt; 107 char *msg, buf[DEV_BSIZE]; 108 struct disklabel l; 109#endif /* defined(BOOTXX_FS_TYPE) */ 110 111 if (blkdev_is_open) { 112 return (EBUSY); 113 } 114 115 *file = (char *)fname; 116 117#if 0 118 f->f_devdata = NULL; /* no point */ 119#endif 120 121 /* Try to read disk label and partition table information. */ 122 blkdev_part_offset = 0; 123#if defined(BOOTXX_FS_TYPE) 124 125 i = diskstrategy(NULL, F_READ, 126 (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt); 127 if (i || cnt != DEV_BSIZE) { 128 return (ENXIO); 129 } 130 msg = getdisklabel(buf, &l); 131 if (msg == NULL) { 132 /* 133 * there's a label. find the first partition of the 134 * type we want and use its offset. if none are 135 * found, we just use offset 0. 136 */ 137 for (i = 0; i < l.d_npartitions; i++) { 138 if (l.d_partitions[i].p_fstype == BOOTXX_FS_TYPE) { 139 blkdev_part_offset = l.d_partitions[i].p_offset; 140 break; 141 } 142 } 143 } else { 144 /* just use offset 0; it's already set that way */ 145 } 146#endif /* defined(BOOTXX_FS_TYPE) */ 147 148 blkdev_is_open = 1; 149 return (0); 150} 151 152int 153blkdevstrategy(void *devdata, int rw, daddr_t bn, size_t reqcnt, void *addrvoid, size_t *cnt) 154 /* cnt: out: number of bytes transfered */ 155{ 156 unsigned char *addr = addrvoid; 157 int res; 158 159#if !defined(LIBSA_NO_TWIDDLE) 160 twiddle(); 161#endif 162 163 /* Partial-block transfers not handled. */ 164 if (reqcnt & (DEV_BSIZE - 1)) { 165 *cnt = 0; 166 return (EINVAL); 167 } 168 res = cfe_readblk(booted_dev_fd,(bn+blkdev_part_offset)*DEV_BSIZE,addr,reqcnt); 169 if (res < 0) return EIO; 170 171 *cnt = res; 172 return (0); 173} 174 175#if !defined(LIBSA_NO_FS_CLOSE) 176int 177blkdevclose(struct open_file *f) 178{ 179 180 blkdev_is_open = 0; 181 return (0); 182} 183#endif /* !defined(LIBSA_NO_FS_CLOSE) */ 184