1 /* $OpenBSD: dkbad.h,v 1.4 2003/06/02 23:28:21 millert Exp $ */
2 /* $NetBSD: dkbad.h,v 1.10 1994/12/25 13:14:21 pk Exp $ */
3
4 /*-
5 * Copyright (c) 1982, 1986, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)dkbad.h 8.2 (Berkeley) 7/10/94
33 */
34
35 #ifndef _SYS_DKBAD_H_
36 #define _SYS_DKBAD_H_
37
38 /*
39 * Definitions needed to perform bad sector revectoring ala DEC STD 144.
40 *
41 * The bad sector information is located in the first 5 even numbered
42 * sectors of the last track of the disk pack. There are five identical
43 * copies of the information, described by the dkbad structure.
44 *
45 * Replacement sectors are allocated starting with the first sector before
46 * the bad sector information and working backwards towards the beginning of
47 * the disk. A maximum of 126 bad sectors are supported. The position of
48 * the bad sector in the bad sector table determines which replacement sector
49 * it corresponds to.
50 *
51 * The bad sector information and replacement sectors are conventionally
52 * only accessible through the 'c' file system partition of the disk. If
53 * that partition is used for a file system, the user is responsible for
54 * making sure that it does not overlap the bad sector information or any
55 * replacement sectors.
56 */
57 #define NBT_BAD 126
58
59 struct dkbad {
60 int32_t bt_csn; /* cartridge serial number */
61 u_int16_t bt_mbz; /* unused; should be 0 */
62 u_int16_t bt_flag; /* -1 => alignment cartridge */
63 struct bt_bad {
64 u_int16_t bt_cyl; /* cylinder number of bad sector */
65 u_int16_t bt_trksec; /* track and sector number */
66 } bt_bad[NBT_BAD];
67 };
68
69 #define ECC 0
70 #define SSE 1
71 #define BSE 2
72 #define CONT 3
73
74 #endif /* _SYS_DKBAD_H_ */