common/include/sys/dkbad.h

   1 /*      $NetBSD: dkbad.h,v 1.15 2005/12/26 18:41:36 perry Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1982, 1986, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)dkbad.h     8.2 (Berkeley) 7/10/94
  32  */
  33
  34 #ifndef _SYS_DKBAD_H_
  35 #define _SYS_DKBAD_H_
  36
  37 /*
  38  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
  39  *
  40  * The bad sector information is located in the first 5 even numbered
  41  * sectors of the last track of the disk pack.  There are five identical
  42  * copies of the information, described by the dkbad structure.
  43  *
  44  * Replacement sectors are allocated starting with the first sector before
  45  * the bad sector information and working backwards towards the beginning of
  46  * the disk.  A maximum of 126 bad sectors are supported.  The position of
  47  * the bad sector in the bad sector table determines which replacement sector
  48  * it corresponds to.
  49  *
  50  * The bad sector information and replacement sectors are conventionally
  51  * only accessible through the 'c' file system partition of the disk.  If
  52  * that partition is used for a file system, the user is responsible for
  53  * making sure that it does not overlap the bad sector information or any
  54  * replacement sectors.
  55  */
  56 #define NBT_BAD 126
  57
  58 struct dkbad {
  59         int32_t   bt_csn;               /* cartridge serial number */
  60         uint16_t bt_mbz;                /* unused; should be 0 */
  61         uint16_t bt_flag;               /* -1 => alignment cartridge */
  62         struct bt_bad {
  63                 uint16_t bt_cyl;        /* cylinder number of bad sector */
  64                 uint16_t bt_trksec;     /* track and sector number */
  65         } bt_bad[NBT_BAD];
  66 };
  67
  68 /*
  69  * An indicator that the bad block handling is available. This is used
  70  * to conditionally enable code that performs badblock re-mapping.
  71  */
  72 #define HAS_BAD144_HANDLING
  73
  74 #define ECC     0
  75 #define SSE     1
  76 #define BSE     2
  77 #define CONT    3
  78
  79 #ifdef _KERNEL
  80 int isbad(struct dkbad *, int, int, int);
  81 #endif
  82 #endif /* _SYS_DKBAD_H_ */