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112 lines
3.7 KiB
112 lines
3.7 KiB
20 years ago
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#ifndef _FTAPE_RW_H
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#define _FTAPE_RW_H
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/*
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* Copyright (C) 1993-1996 Bas Laarhoven,
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* (C) 1996-1997 Claus-Justus Heine.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-rw.h,v $
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* $Revision: 1.2 $
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* $Date: 1997/10/05 19:18:25 $
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*
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* This file contains the definitions for the read and write
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* functions for the QIC-117 floppy-tape driver for Linux.
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*
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* Claus-Justus Heine (1996/09/20): Add definition of format code 6
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* Claus-Justus Heine (1996/10/04): Changed GET/PUT macros to cast to (__u8 *)
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*
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*/
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#include "../lowlevel/fdc-io.h"
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#include "../lowlevel/ftape-init.h"
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#include "../lowlevel/ftape-bsm.h"
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#include <asm/unaligned.h>
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#define GET2(address, offset) get_unaligned((__u16*)((__u8 *)address + offset))
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#define GET4(address, offset) get_unaligned((__u32*)((__u8 *)address + offset))
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#define GET8(address, offset) get_unaligned((__u64*)((__u8 *)address + offset))
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#define PUT2(address, offset , value) put_unaligned((value), (__u16*)((__u8 *)address + offset))
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#define PUT4(address, offset , value) put_unaligned((value), (__u32*)((__u8 *)address + offset))
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#define PUT8(address, offset , value) put_unaligned((value), (__u64*)((__u8 *)address + offset))
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enum runner_status_enum {
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idle = 0,
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running,
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do_abort,
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aborting,
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logical_eot,
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end_of_tape,
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};
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typedef enum ft_buffer_queue {
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ft_queue_head = 0,
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ft_queue_tail = 1
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} ft_buffer_queue_t;
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typedef struct {
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int track; /* tape head position */
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volatile int segment; /* current segment */
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volatile int sector; /* sector offset within current segment */
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volatile unsigned int bot; /* logical begin of track */
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volatile unsigned int eot; /* logical end of track */
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volatile unsigned int known; /* validates bot, segment, sector */
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} location_record;
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/* Count nr of 1's in pattern.
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*/
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static inline int count_ones(unsigned long mask)
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{
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int bits;
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for (bits = 0; mask != 0; mask >>= 1) {
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if (mask & 1) {
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++bits;
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}
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}
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return bits;
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}
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#define FT_MAX_NR_BUFFERS 16 /* arbitrary value */
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/* ftape-rw.c defined global vars.
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*/
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extern buffer_struct *ft_buffer[FT_MAX_NR_BUFFERS];
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extern int ft_nr_buffers;
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extern location_record ft_location;
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extern volatile int ftape_tape_running;
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/* ftape-rw.c defined global functions.
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*/
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extern int ftape_setup_new_segment(buffer_struct * buff,
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int segment_id,
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int offset);
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extern int ftape_calc_next_cluster(buffer_struct * buff);
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extern buffer_struct *ftape_next_buffer (ft_buffer_queue_t pos);
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extern buffer_struct *ftape_get_buffer (ft_buffer_queue_t pos);
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extern int ftape_buffer_id (ft_buffer_queue_t pos);
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extern void ftape_reset_buffer(void);
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extern void ftape_tape_parameters(__u8 drive_configuration);
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extern int ftape_wait_segment(buffer_state_enum state);
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extern int ftape_dumb_stop(void);
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extern int ftape_start_tape(int segment_id, int offset);
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extern int ftape_stop_tape(int *pstatus);
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extern int ftape_handle_logical_eot(void);
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extern buffer_state_enum ftape_set_state(buffer_state_enum new_state);
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#endif /* _FTAPE_RW_H */
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