| 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 | |