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floppy.h

Go to the documentation of this file.

// See the end of this file for license information.

#ifndef TORSION_FLOPPY_H
#define TORSION_FLOPPY_H

#include "dma.h"
#include "irq.h"
#include "blockdev.h"


class Floppy {
protected:
  static const unsigned int BLOCK_SIZE = 512;
  DMA_buffer buffer;                    
  volatile unsigned int timeout_counter;
  bool motor_on;                        
  int motor_counter;                    
  bool disk_change;
  unsigned char status[7];
  unsigned char status_size;
  unsigned char sr0;
  unsigned char current_track;          

public:
  volatile bool operation_done;         
  
  void
  init();
  
  void
  update_timers();

  void
  deinit();

  void
  reset();

  void
  send_byte(unsigned short int byte);

  short int
  get_byte();

  bool
  wait_for_op(bool sense_interrupt_status);

  bool
  seek(unsigned char track);

  void
  recalibrate();

  void
  turn_motor_on();

  void
  turn_motor_off();

  bool
  read_block(unsigned int block, void* data);
  
  bool
  write_block(unsigned int block, void* data);

  bool
  read_write(unsigned int block, void* data, bool read);

  void
  implement(Block_device& disk);
};

inline void
floppy_init(void* floppy) {
  ((Floppy*)floppy)->init();
}

inline void
floppy_deinit(void* floppy) {
  ((Floppy*)floppy)->init();
}

inline bool
floppy_read_block(void* floppy, unsigned int block, void* data) {
  return ((Floppy*)floppy)->read_block(block, data);
}

inline bool
floppy_write_block(void* floppy, unsigned int block, void* data) {
  return ((Floppy*)floppy)->write_block(block, data);
}

extern Floppy floppy;

inline void
floppy_interrupt_handler(volatile Handler_registers& registers);

inline void
floppy_timer_handler(volatile Handler_registers& registers);

const unsigned int DG144_HEADS = 2;     
const unsigned int DG144_TRACKS = 80;   
const unsigned int DG144_SPT = 18;      
const unsigned int DG144_GAP3FMT = 0x54;
const unsigned int DG144_GAP3RW = 0x1b; 

const unsigned int DG168_HEADS = 2;     
const unsigned int DG168_TRACKS = 80;   
const unsigned int DG168_SPT = 21;      
const unsigned int DG168_GAP3FMT = 0x0c;
const unsigned int DG168_GAP3RW = 0x1c; 

const unsigned int FDC_DOR = 0x3f2;     
const unsigned int FDC_MSR = 0x3f4;     
const unsigned int FDC_DRS = 0x3f4;     
const unsigned int FDC_DATA = 0x3f5;    
const unsigned int FDC_DIR = 0x3f7;     
const unsigned int FDC_CCR = 0x3f7;     

const unsigned int CMD_SPECIFY = 0x03;  
const unsigned int CMD_WRITE = 0xc5;    
const unsigned int CMD_READ = 0xe6;     
const unsigned int CMD_RECAL = 0x07;    
const unsigned int CMD_SENSEI = 0x08;   
const unsigned int CMD_FORMAT = 0x4d;   
const unsigned int CMD_SEEK = 0x0f;     
const unsigned int CMD_VERSION = 0x10;  

#endif

/* Torsion Operating System, Copyright (C) 2000-2002 Dan Helfman
 *
 * 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 of the License, 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 (in the COPYING file).
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

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Torsion Operating System, Copyright (C) 2000-2002 Dan Helfman