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      1 /*	$NetBSD: dkbad.h,v 1.16 2026/07/03 21:35:57 thorpej 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 #define	BAD144_MAXCYLNO	0xffff		/* maximum cylinder number */
     69 #define	BAD144_MAXTRKNO	0xff		/* maximum track number */
     70 #define	BAD144_MAXSECNO	0xff		/* maximum sector number */
     71 
     72 /*
     73  * An indicator that the bad block handling is available. This is used
     74  * to conditionally enable code that performs badblock re-mapping.
     75  */
     76 #define	HAS_BAD144_HANDLING
     77 
     78 #define	ECC	0
     79 #define	SSE	1
     80 #define	BSE	2
     81 #define	CONT	3
     82 
     83 #ifdef _KERNEL
     84 struct bad144_context;
     85 
     86 struct bad144_context *
     87 	bad144_init(uint32_t, uint32_t, uint32_t, uint32_t);
     88 void	bad144_fini(struct bad144_context *);
     89 int	bad144_set(struct bad144_context *, const struct dkbad *);
     90 int	bad144_load(struct bad144_context *, dev_t, void (*)(struct buf *));
     91 int	bad144_isbad_chs(const struct bad144_context *,
     92 			 uint32_t, uint32_t, uint32_t);
     93 int	bad144_isbad_lba(const struct bad144_context *,
     94 			 daddr_t, int, int *);
     95 #endif /* _KERNEL */
     96 
     97 #endif /* _SYS_DKBAD_H_ */
     98