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      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_ */
     83