projects / linux.git / blame
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| 1da177e4 LT |
1 | #ifndef _FTAPE_HEADER_SEGMENT_H |
| 2 | #define _FTAPE_HEADER_SEGMENT_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Copyright (C) 1996-1997 Claus-Justus Heine. | |
| 6 | ||
| 7 | This program is free software; you can redistribute it and/or modify | |
| 8 | it under the terms of the GNU General Public License as published by | |
| 9 | the Free Software Foundation; either version 2, or (at your option) | |
| 10 | any later version. | |
| 11 | ||
| 12 | This program is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 | GNU General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU General Public License | |
| 18 | along with this program; see the file COPYING. If not, write to | |
| 19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 20 | ||
| 21 | * | |
| 22 | * $Source: /homes/cvs/ftape-stacked/include/linux/ftape-header-segment.h,v $ | |
| 23 | * $Revision: 1.2 $ | |
| 24 | * $Date: 1997/10/05 19:19:28 $ | |
| 25 | * | |
| 26 | * This file defines some offsets into the header segment of a | |
| 27 | * floppy tape cartridge. For use with the QIC-40/80/3010/3020 | |
| 28 | * floppy-tape driver "ftape" for Linux. | |
| 29 | */ | |
| 30 | ||
| 31 | #define FT_SIGNATURE 0 /* must be 0xaa55aa55 */ | |
| 32 | #define FT_FMT_CODE 4 | |
| 33 | #define FT_REV_LEVEL 5 /* only for QIC-80 since. Rev. L (== 0x0c) */ | |
| 34 | #define FT_HSEG_1 6 /* first header segment, except for format code 6 */ | |
| 35 | #define FT_HSEG_2 8 /* second header segment, except for format code 6 */ | |
| 36 | #define FT_FRST_SEG 10 /* first data segment, except for format code 6 */ | |
| 37 | #define FT_LAST_SEG 12 /* last data segment, except for format code 6 */ | |
| 38 | #define FT_FMT_DATE 14 /* date and time of most recent format, see below */ | |
| 39 | #define FT_WR_DATE 18 /* date and time of most recent write or format */ | |
| 40 | #define FT_SPT 24 /* segments per track */ | |
| 41 | #define FT_TPC 26 /* tracks per cartridge */ | |
| 42 | #define FT_FHM 27 /* floppy drive head (maximum of it) */ | |
| 43 | #define FT_FTM 28 /* floppy track max. */ | |
| 44 | #define FT_FSM 29 /* floppy sector max. (128) */ | |
| 45 | #define FT_LABEL 30 /* floppy tape label */ | |
| 46 | #define FT_LABEL_DATE 74 /* date and time the tape label was written */ | |
| 47 | #define FT_LABEL_SZ (FT_LABEL_DATE - FT_LABEL) | |
| 48 | #define FT_CMAP_START 78 /* starting segment of compression map */ | |
| 49 | #define FT_FMT_ERROR 128 /* must be set to 0xff if remainder gets lost during | |
| 50 | * tape format | |
| 51 | */ | |
| 52 | #define FT_SEG_CNT 130 /* number of seg. written, formatted or verified | |
| 53 | * through lifetime of tape (why not read?) | |
| 54 | */ | |
| 55 | #define FT_INIT_DATE 138 /* date and time of initial tape format */ | |
| 56 | #define FT_FMT_CNT 142 /* number of times tape has been formatted */ | |
| 57 | #define FT_FSL_CNT 144 /* number of segments in failed sector log */ | |
| 58 | #define FT_MK_CODE 146 /* id string of tape manufacturer */ | |
| 59 | #define FT_LOT_CODE 190 /* tape manufacturer lot code */ | |
| 60 | #define FT_6_HSEG_1 234 /* first header segment for format code 6 */ | |
| 61 | #define FT_6_HSEG_2 238 /* second header segment for format code 6 */ | |
| 62 | #define FT_6_FRST_SEG 242 /* first data segment for format code 6 */ | |
| 63 | #define FT_6_LAST_SEG 246 /* last data segment for format code 6 */ | |
| 64 | ||
| 65 | #define FT_FSL 256 | |
| 66 | #define FT_HEADER_END 256 /* space beyond this point: | |
| 67 | * format codes 2, 3 and 5: | |
| 68 | * - failed sector log until byte 2047 | |
| 69 | * - bad sector map in the reamining part of segment | |
| 70 | * format codes 4 and 6: | |
| 71 | * - bad sector map starts hear | |
| 72 | */ | |
| 73 | ||
| 74 | ||
| 75 | /* value to be stored at the FT_SIGNATURE offset | |
| 76 | */ | |
| 77 | #define FT_HSEG_MAGIC 0xaa55aa55 | |
| 78 | #define FT_D2G_MAGIC 0x82288228 /* Ditto 2GB */ | |
| 79 | ||
| 80 | /* data and time encoding: */ | |
| 81 | #define FT_YEAR_SHIFT 25 | |
| 82 | #define FT_YEAR_MASK 0xfe000000 | |
| 83 | #define FT_YEAR_0 1970 | |
| 84 | #define FT_YEAR_MAX 127 | |
| 85 | #define FT_YEAR(year) ((((year)-FT_YEAR_0)<<FT_YEAR_SHIFT)&FT_YEAR_MASK) | |
| 86 | ||
| 87 | #define FT_TIME_SHIFT 0 | |
| 88 | #define FT_TIME_MASK 0x01FFFFFF | |
| 89 | #define FT_TIME_MAX 0x01ea6dff /* last second of a year */ | |
| 90 | #define FT_TIME(mo,d,h,m,s) \ | |
| 91 | ((((s)+60*((m)+60*((h)+24*((d)+31*(mo))))) & FT_TIME_MASK)) | |
| 92 | ||
| 93 | #define FT_TIME_STAMP(y,mo,d,h,m,s) (FT_YEAR(y) | FT_TIME(mo,d,h,m,s)) | |
| 94 | ||
| 95 | /* values for the format code field */ | |
| 96 | typedef enum { | |
| 97 | fmt_normal = 2, /* QIC-80 post Rev. B 205Ft or 307Ft tape */ | |
| 98 | fmt_1100ft = 3, /* QIC-80 post Rev. B 1100Ft tape */ | |
| 99 | fmt_var = 4, /* QIC-80 post Rev. B variabel length format */ | |
| 100 | fmt_425ft = 5, /* QIC-80 post Rev. B 425Ft tape */ | |
| 101 | fmt_big = 6 /* QIC-3010/3020 variable length tape with more | |
| 102 | * than 2^16 segments per tape | |
| 103 | */ | |
| 104 | } ft_format_type; | |
| 105 | ||
| 106 | /* definitions for the failed sector log */ | |
| 107 | #define FT_FSL_SIZE (2 * FT_SECTOR_SIZE - FT_HEADER_END) | |
| 108 | #define FT_FSL_MAX_ENTRIES (FT_FSL_SIZE/sizeof(__u32)) | |
| 109 | ||
| 110 | typedef struct ft_fsl_entry { | |
| 111 | __u16 segment; | |
| 112 | __u16 date; | |
| 113 | } __attribute__ ((packed)) ft_fsl_entry; | |
| 114 | ||
| 115 | ||
| 116 | /* date encoding for the failed sector log | |
| 117 | * month: 1..12, day: 1..31, year: 1970..2097 | |
| 118 | */ | |
| 119 | #define FT_FSL_TIME_STAMP(y,m,d) \ | |
| 120 | (((((y) - FT_YEAR_0)<<9)&0xfe00) | (((m)<<5)&0x01e0) | ((d)&0x001f)) | |
| 121 | ||
| 122 | #endif /* _FTAPE_HEADER_SEGMENT_H */ |