include/linux/ftape-header-segment.h

   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 */