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/* channel.h -- Definition of types and structures for

   peripheral to communicate with host.  Addapted from UML.

   Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>

   Copyright (C) 2008 Embecosm Limited

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.

   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 3 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.

   You should have received a copy of the GNU General Public License along

   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

#ifndef CHANNEL__H

#define CHANNEL__H

/*! A data structure representing all the functions required on a channel */

struct channel_ops

{

  void *(*init) (const char *);

  int   (*open) (void *);

  void  (*close) (void *);

  int   (*read) (void *, char *, int);

  int   (*write) (void *, const char *, int);

  void  (*free) (void *);

  int   (*isok) (void *);

  char *(*status) (void *);

};

/*! A data structure representing a channel. Its operations and data */

struct channel

{

  const struct channel_ops *ops;

  void *data;

};

/* Function prototypes for external use */

extern struct channel *channel_init (const char *descriptor);

extern int             channel_open (struct channel *channel);

extern int             channel_read (struct channel *channel,

                                     char           *buffer,

                                     int             size);

extern int             channel_write (struct channel *channel,

                                      const char     *buffer,

                                      int             size);

extern void            channel_close (struct channel *channel);

#endif  /* CHANNEL__H */