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
58struct 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
80int isbad(struct dkbad *, int, int, int);
81#endif
82#endif /* _SYS_DKBAD_H_ */