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