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Annotation of XNU/bsd/sys/dkbad.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            23: /*-
        !            24:  * Copyright (c) 1982, 1986, 1993, 1994
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * Redistribution and use in source and binary forms, with or without
        !            28:  * modification, are permitted provided that the following conditions
        !            29:  * are met:
        !            30:  * 1. Redistributions of source code must retain the above copyright
        !            31:  *    notice, this list of conditions and the following disclaimer.
        !            32:  * 2. Redistributions in binary form must reproduce the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer in the
        !            34:  *    documentation and/or other materials provided with the distribution.
        !            35:  * 3. All advertising materials mentioning features or use of this software
        !            36:  *    must display the following acknowledgement:
        !            37:  *     This product includes software developed by the University of
        !            38:  *     California, Berkeley and its contributors.
        !            39:  * 4. Neither the name of the University nor the names of its contributors
        !            40:  *    may be used to endorse or promote products derived from this software
        !            41:  *    without specific prior written permission.
        !            42:  *
        !            43:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            44:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            45:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            46:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            47:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            48:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            49:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            50:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            51:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            52:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            53:  * SUCH DAMAGE.
        !            54:  *
        !            55:  *     @(#)dkbad.h     8.2 (Berkeley) 7/10/94
        !            56:  */
        !            57: 
        !            58: #ifndef _SYS_DKBAD_H_
        !            59: #define _SYS_DKBAD_H_
        !            60: 
        !            61: /*
        !            62:  * Definitions needed to perform bad sector revectoring ala DEC STD 144.
        !            63:  *
        !            64:  * The bad sector information is located in the first 5 even numbered
        !            65:  * sectors of the last track of the disk pack.  There are five identical
        !            66:  * copies of the information, described by the dkbad structure.
        !            67:  *
        !            68:  * Replacement sectors are allocated starting with the first sector before
        !            69:  * the bad sector information and working backwards towards the beginning of
        !            70:  * the disk.  A maximum of 126 bad sectors are supported.  The position of
        !            71:  * the bad sector in the bad sector table determines which replacement sector
        !            72:  * it corresponds to.
        !            73:  *
        !            74:  * The bad sector information and replacement sectors are conventionally
        !            75:  * only accessible through the 'c' file system partition of the disk.  If
        !            76:  * that partition is used for a file system, the user is responsible for
        !            77:  * making sure that it does not overlap the bad sector information or any
        !            78:  * replacement sectors.
        !            79:  */
        !            80: struct dkbad {
        !            81:        int32_t   bt_csn;               /* cartridge serial number */
        !            82:        u_int16_t bt_mbz;               /* unused; should be 0 */
        !            83:        u_int16_t bt_flag;              /* -1 => alignment cartridge */
        !            84:        struct bt_bad {
        !            85:                u_int16_t bt_cyl;       /* cylinder number of bad sector */
        !            86:                u_int16_t bt_trksec;    /* track and sector number */
        !            87:        } bt_bad[126];
        !            88: };
        !            89: 
        !            90: #define        ECC     0
        !            91: #define        SSE     1
        !            92: #define        BSE     2
        !            93: #define        CONT    3
        !            94: 
        !            95: #endif /* _SYS_DKBAD_H_ */

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