root/drivers/char/ftape/ftape-rw.h

/* */

INCLUDED FROM

   1 #ifndef _FTAPE_RW_H
   2 #define _FTAPE_RW_H
   3 
   4 /*
   5  * Copyright (C) 1993-1995 Bas Laarhoven.
   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: /home/bas/distr/ftape-2.03b/RCS/ftape-rw.h,v $
  23  $Author: bas $
  24  *
  25  $Revision: 1.33 $
  26  $Date: 1995/04/22 07:30:15 $
  27  $State: Beta $
  28  *
  29  *      This file contains the definitions for the read and write
  30  *      functions for the QIC-117 floppy-tape driver for Linux.
  31  *
  32  */
  33 
  34 #include "fdc-io.h"
  35 #include "kernel-interface.h"
  36 
  37 #define GET2( address, offset) *(short*)(address + offset)
  38 #define GET4( address, offset) *(long*)(address + offset)
  39 #define PUT2( address, offset, value) *(short*)(address + offset) = value
  40 #define PUT4( address, offset, value) *(long*)(address + offset) = value
  41 
  42 enum runner_status_enum {
  43         idle = 0,
  44         running,
  45         do_abort,
  46         aborting,
  47         logical_eot,
  48         end_of_tape,
  49         buffer_overrun,
  50         buffer_underrun,
  51 };
  52 
  53 typedef struct {
  54         byte *address;
  55         volatile buffer_state_enum status;
  56         volatile byte *ptr;
  57         volatile unsigned bytes;
  58         volatile unsigned segment_id;
  59 
  60         /* bitmap for remainder of segment not yet handled.
  61          * one bit set for each bad sector that must be skipped.
  62          */
  63         volatile unsigned long bad_sector_map;
  64 
  65         /* bitmap with bad data blocks in data buffer.
  66          * the errors in this map may be retried.
  67          */
  68         volatile unsigned long soft_error_map;
  69 
  70         /* bitmap with bad data blocks in data buffer
  71          * the errors in this map may not be retried.
  72          */
  73         volatile unsigned long hard_error_map;
  74 
  75         /* retry counter for soft errors.
  76          */
  77         volatile int retry;
  78 
  79         /* sectors to skip on retry ???
  80          */
  81         volatile unsigned int skip;
  82 
  83         /* nr of data blocks in data buffer
  84          */
  85         volatile unsigned data_offset;
  86 
  87         /* offset in segment for first sector to be handled.
  88          */
  89         volatile unsigned sector_offset;
  90 
  91         /* size of cluster of good sectors to be handled.
  92          */
  93         volatile unsigned sector_count;
  94 
  95         /* size of remaining part of segment to be handled.
  96          */
  97         volatile unsigned remaining;
  98 
  99         /* points to next segment (contiguous) to be handled,
 100          * or is zero if no read-ahead is allowed.
 101          */
 102         volatile unsigned next_segment;
 103 
 104         /* flag being set if deleted data was read.
 105          */
 106         volatile int deleted;
 107 
 108         volatile byte head;
 109         volatile byte cyl;
 110         volatile byte sect;
 111 } buffer_struct;
 112 
 113 typedef struct {
 114         int active;
 115         int error;
 116         int offset;
 117 } ftape_fast_start_struct;
 118 
 119 typedef struct {
 120         int id;
 121         int size;
 122         int free;
 123 } ftape_last_segment_struct;
 124 
 125 typedef struct {
 126         int track;              /* tape head position */
 127         volatile int known;     /* validates bot, segment, sector */
 128         volatile int bot;       /* logical begin of track */
 129         volatile int eot;       /* logical end of track */
 130         volatile int segment;   /* current segment */
 131         volatile int sector;    /* sector offset within current segment */
 132 } location_record;
 133 
 134 typedef enum {
 135         fmt_normal = 2, fmt_1100ft = 3, fmt_wide = 4, fmt_425ft = 5
 136 } format_type;
 137 
 138 /*      ftape-rw.c defined global vars.
 139  */
 140 extern int tracing;
 141 extern byte trace_id;
 142 extern buffer_struct buffer[];
 143 extern location_record location;
 144 extern volatile ftape_fast_start_struct ftape_fast_start;
 145 extern byte deblock_buffer[(SECTORS_PER_SEGMENT - 3) * SECTOR_SIZE];
 146 extern byte scratch_buffer[(SECTORS_PER_SEGMENT - 3) * SECTOR_SIZE];
 147 extern ftape_last_segment_struct ftape_last_segment;
 148 extern int header_segment_1;
 149 extern int header_segment_2;
 150 extern int used_header_segment;
 151 extern unsigned int fast_seek_segment_time;
 152 extern volatile int tape_running;
 153 extern format_type format_code;
 154 
 155 /*      ftape-rw.c defined global functions.
 156  */
 157 extern int count_ones(unsigned long mask);
 158 extern int valid_segment_no(unsigned segment);
 159 extern int setup_new_segment(buffer_struct * buff, unsigned int segment_id,
 160                              int offset);
 161 extern int calc_next_cluster(buffer_struct * buff);
 162 extern buffer_struct *next_buffer(volatile int *x);
 163 extern int ftape_read_id(void);
 164 extern void ftape_tape_parameters(byte drive_configuration);
 165 extern int wait_segment(buffer_state_enum state);
 166 extern int ftape_dumb_stop(void);
 167 extern int ftape_start_tape(int segment_id, int offset);
 168 
 169 /*      fdc-io.c defined global functions.
 170  */
 171 extern int setup_fdc_and_dma(buffer_struct * buff, byte operation);
 172 
 173 #endif                          /* _FTAPE_RW_H */

/* */