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Diffstat (limited to 'include/linux/ftape-header-segment.h')
| -rw-r--r-- | include/linux/ftape-header-segment.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/include/linux/ftape-header-segment.h b/include/linux/ftape-header-segment.h new file mode 100644 index 00000000000..4732218f070 --- /dev/null +++ b/include/linux/ftape-header-segment.h @@ -0,0 +1,122 @@ +#ifndef _FTAPE_HEADER_SEGMENT_H +#define _FTAPE_HEADER_SEGMENT_H + +/* + * Copyright (C) 1996-1997 Claus-Justus Heine. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not, write to + the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + * + * $Source: /homes/cvs/ftape-stacked/include/linux/ftape-header-segment.h,v $ + * $Revision: 1.2 $ + * $Date: 1997/10/05 19:19:28 $ + * + * This file defines some offsets into the header segment of a + * floppy tape cartridge. For use with the QIC-40/80/3010/3020 + * floppy-tape driver "ftape" for Linux. + */ + +#define FT_SIGNATURE 0 /* must be 0xaa55aa55 */ +#define FT_FMT_CODE 4 +#define FT_REV_LEVEL 5 /* only for QIC-80 since. Rev. L (== 0x0c) */ +#define FT_HSEG_1 6 /* first header segment, except for format code 6 */ +#define FT_HSEG_2 8 /* second header segment, except for format code 6 */ +#define FT_FRST_SEG 10 /* first data segment, except for format code 6 */ +#define FT_LAST_SEG 12 /* last data segment, except for format code 6 */ +#define FT_FMT_DATE 14 /* date and time of most recent format, see below */ +#define FT_WR_DATE 18 /* date and time of most recent write or format */ +#define FT_SPT 24 /* segments per track */ +#define FT_TPC 26 /* tracks per cartridge */ +#define FT_FHM 27 /* floppy drive head (maximum of it) */ +#define FT_FTM 28 /* floppy track max. */ +#define FT_FSM 29 /* floppy sector max. (128) */ +#define FT_LABEL 30 /* floppy tape label */ +#define FT_LABEL_DATE 74 /* date and time the tape label was written */ +#define FT_LABEL_SZ (FT_LABEL_DATE - FT_LABEL) +#define FT_CMAP_START 78 /* starting segment of compression map */ +#define FT_FMT_ERROR 128 /* must be set to 0xff if remainder gets lost during + * tape format + */ +#define FT_SEG_CNT 130 /* number of seg. written, formatted or verified + * through lifetime of tape (why not read?) + */ +#define FT_INIT_DATE 138 /* date and time of initial tape format */ +#define FT_FMT_CNT 142 /* number of times tape has been formatted */ +#define FT_FSL_CNT 144 /* number of segments in failed sector log */ +#define FT_MK_CODE 146 /* id string of tape manufacturer */ +#define FT_LOT_CODE 190 /* tape manufacturer lot code */ +#define FT_6_HSEG_1 234 /* first header segment for format code 6 */ +#define FT_6_HSEG_2 238 /* second header segment for format code 6 */ +#define FT_6_FRST_SEG 242 /* first data segment for format code 6 */ +#define FT_6_LAST_SEG 246 /* last data segment for format code 6 */ + +#define FT_FSL 256 +#define FT_HEADER_END 256 /* space beyond this point: + * format codes 2, 3 and 5: + * - failed sector log until byte 2047 + * - bad sector map in the reamining part of segment + * format codes 4 and 6: + * - bad sector map starts hear + */ + + +/* value to be stored at the FT_SIGNATURE offset + */ +#define FT_HSEG_MAGIC 0xaa55aa55 +#define FT_D2G_MAGIC 0x82288228 /* Ditto 2GB */ + +/* data and time encoding: */ +#define FT_YEAR_SHIFT 25 +#define FT_YEAR_MASK 0xfe000000 +#define FT_YEAR_0 1970 +#define FT_YEAR_MAX 127 +#define FT_YEAR(year) ((((year)-FT_YEAR_0)<<FT_YEAR_SHIFT)&FT_YEAR_MASK) + +#define FT_TIME_SHIFT 0 +#define FT_TIME_MASK 0x01FFFFFF +#define FT_TIME_MAX 0x01ea6dff /* last second of a year */ +#define FT_TIME(mo,d,h,m,s) \ + ((((s)+60*((m)+60*((h)+24*((d)+31*(mo))))) & FT_TIME_MASK)) + +#define FT_TIME_STAMP(y,mo,d,h,m,s) (FT_YEAR(y) | FT_TIME(mo,d,h,m,s)) + +/* values for the format code field */ +typedef enum { + fmt_normal = 2, /* QIC-80 post Rev. B 205Ft or 307Ft tape */ + fmt_1100ft = 3, /* QIC-80 post Rev. B 1100Ft tape */ + fmt_var = 4, /* QIC-80 post Rev. B variabel length format */ + fmt_425ft = 5, /* QIC-80 post Rev. B 425Ft tape */ + fmt_big = 6 /* QIC-3010/3020 variable length tape with more + * than 2^16 segments per tape + */ +} ft_format_type; + +/* definitions for the failed sector log */ +#define FT_FSL_SIZE (2 * FT_SECTOR_SIZE - FT_HEADER_END) +#define FT_FSL_MAX_ENTRIES (FT_FSL_SIZE/sizeof(__u32)) + +typedef struct ft_fsl_entry { + __u16 segment; + __u16 date; +} __attribute__ ((packed)) ft_fsl_entry; + + +/* date encoding for the failed sector log + * month: 1..12, day: 1..31, year: 1970..2097 + */ +#define FT_FSL_TIME_STAMP(y,m,d) \ + (((((y) - FT_YEAR_0)<<9)&0xfe00) | (((m)<<5)&0x01e0) | ((d)&0x001f)) + +#endif /* _FTAPE_HEADER_SEGMENT_H */ |