#ifndef parallel_H
#define parallel_H

/* C header file for Parallel
 * Written by DefMod (Dec  9 2012) on Sun Dec  9 15:49:36 2012
 * Jonathan Coxhead, jonathan@doves.demon.co.uk, 12 May 1995
 */

/* OSLib---efficient, type-safe, transparent, extensible,
 * register-safe API coverage of RISC OS
 * 
 * Copyright (c) 1994-2012 Jonathan Coxhead and OSLib maintainers
 * 
 * Licence:
 * 
 *    OSLib 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 1, or (at your option)
 * any later version - and this with the following clarification and
 * special exception:
 * 
 *    Linking this library statically or dynamically with other modules
 * is making a combined work based on this library. Thus, the terms
 * and conditions of the GNU General Public License cover the whole
 * combination.
 * 
 *    As a special exception, the copyright holders of this library
 * give you permission to link this library with independent modules
 * to produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also meet,
 * for each linked independent module, the terms and conditions of the
 * license of that module. An independent module is a module which is
 * not derived from or based on this library. If you modify this
 * library, you may extend this exception to your version of the library,
 * but you are not obliged to do so. If you do not wish to do so, delete
 * this exception statement from your version.
 * 
 *    OSLib 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 programme; if not, write to the Free Software
 * Foundation, Inc, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef types_H
#include "oslib/types.h"
#endif

#ifndef os_H
#include "oslib/os.h"
#endif

#if defined NAMESPACE_OSLIB
  namespace OSLib {
#endif

/**********************************
 * SWI names and SWI reason codes *
 **********************************/
#undef  Parallel_HardwareAddress
#define Parallel_HardwareAddress                0x42EC0
#undef  XParallel_HardwareAddress
#define XParallel_HardwareAddress               0x62EC0
#undef  Parallel_Op
#define Parallel_Op                             0x42EC1
#undef  XParallel_Op
#define XParallel_Op                            0x62EC1
#undef  ParallelOp_Read
#define ParallelOp_Read                         0x0
#undef  ParallelOp_WriteData
#define ParallelOp_WriteData                    0x1
#undef  ParallelOp_WriteControl
#define ParallelOp_WriteControl                 0x2

/*************************
 * Function declarations *
 *************************/

#ifdef __cplusplus
   extern "C" {
#endif

/* ------------------------------------------------------------------------
 * Function:      parallelop_read()
 *
 * Description:   Reads the data and status registers
 *
 * Output:        data_register - value of R1 on exit
 *                status_register - value of R2 on exit
 *
 * Other notes:   Calls SWI 0x42EC1 with R0 = 0x0.
 */

extern os_error *xparallelop_read (bits *data_register,
      bits *status_register);
extern void parallelop_read (bits *data_register,
      bits *status_register);

/* ------------------------------------------------------------------------
 * Function:      parallelop_write_data()
 *
 * Description:   Writes the data register
 *
 * Input:         data - value of R1 on entry
 *
 * Other notes:   Calls SWI 0x42EC1 with R0 = 0x1.
 */

extern os_error *xparallelop_write_data (bits data);
extern void parallelop_write_data (bits data);

/* ------------------------------------------------------------------------
 * Function:      parallelop_write_control()
 *
 * Description:   Reads/writes the control register
 *
 * Input:         eor_mask - value of R1 on entry
 *                and_mask - value of R2 on entry
 *
 * Output:        old_control - value of R1 on exit (X version only)
 *                new_control - value of R2 on exit
 *
 * Returns:       R1 (non-X version only)
 *
 * Other notes:   Calls SWI 0x42EC1 with R0 = 0x2.
 */

extern os_error *xparallelop_write_control (bits eor_mask,
      bits and_mask,
      bits *old_control,
      bits *new_control);
extern bits parallelop_write_control (bits eor_mask,
      bits and_mask,
      bits *new_control);

#ifdef __cplusplus
   }
#endif

#if defined NAMESPACE_OSLIB
  } 
#endif

#endif
