bsd/sys/dkbad.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*-
  24  * Copyright (c) 1982, 1986, 1993, 1994
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)dkbad.h     8.2 (Berkeley) 7/10/94
  56  */
  57
  58 #ifndef _SYS_DKBAD_H_
  59 #define _SYS_DKBAD_H_
  60
  61 /*
  62  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
  63  *
  64  * The bad sector information is located in the first 5 even numbered
  65  * sectors of the last track of the disk pack.  There are five identical
  66  * copies of the information, described by the dkbad structure.
  67  *
  68  * Replacement sectors are allocated starting with the first sector before
  69  * the bad sector information and working backwards towards the beginning of
  70  * the disk.  A maximum of 126 bad sectors are supported.  The position of
  71  * the bad sector in the bad sector table determines which replacement sector
  72  * it corresponds to.
  73  *
  74  * The bad sector information and replacement sectors are conventionally
  75  * only accessible through the 'c' file system partition of the disk.  If
  76  * that partition is used for a file system, the user is responsible for
  77  * making sure that it does not overlap the bad sector information or any
  78  * replacement sectors.
  79  */
  80 struct dkbad {
  81         int32_t   bt_csn;               /* cartridge serial number */
  82         u_int16_t bt_mbz;               /* unused; should be 0 */
  83         u_int16_t bt_flag;              /* -1 => alignment cartridge */
  84         struct bt_bad {
  85                 u_int16_t bt_cyl;       /* cylinder number of bad sector */
  86                 u_int16_t bt_trksec;    /* track and sector number */
  87         } bt_bad[126];
  88 };
  89
  90 #define ECC     0
  91 #define SSE     1
  92 #define BSE     2
  93 #define CONT    3
  94
  95 #endif /* _SYS_DKBAD_H_ */