sys/arch/sbmips/stand/common/blkdev.c

   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
  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(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
 152 int
 153 blkdevstrategy(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)
 176 int
 177 blkdevclose(struct open_file *f)
 178 {
 179
 180         blkdev_is_open = 0;
 181         return (0);
 182 }
 183 #endif /* !defined(LIBSA_NO_FS_CLOSE) */