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/* Hardware ports.

   Copyright (C) 1998 Free Software Foundation, Inc.

   Contributed by Andrew Cagney and Cygnus Solutions.

This file is part of GDB, the GNU debugger.

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, 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, write to the Free Software Foundation, Inc.,

59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef HW_PORTS_H

#define HW_PORTS_H

/* Initialize a port */

struct hw_port_descriptor {

  const char *name;

  int number;

  int nr_ports;

  port_direction direction;

};

void set_hw_ports (struct hw *hw, const struct hw_port_descriptor ports[]);

typedef void (hw_port_event_method)

     (struct hw *me,

      int my_port,

      struct hw *source,

      int source_port,

      int level);

void set_hw_port_event (struct hw *hw, hw_port_event_method *to_port_event);

/* Port source

   A device drives its output ports using the call

   */

void hw_port_event

(struct hw *me,

 int my_port,

 int value);

/* This port event will then be propogated to any attached

   destination ports.

   Any interpretation of PORT and VALUE is model dependant.  As a

   guideline the following are recommended: PCI interrupts A-D should

   correspond to ports 0-3; level sensative interrupts be requested

   with a value of one and withdrawn with a value of 0; edge sensative

   interrupts always have a value of 1, the event its self is treated

   as the interrupt.

   Port destinations

   Attached to each port of a device can be zero or more

   desitinations.  These destinations consist of a device/port pair.

   A destination is attached/detached to a device line using the

   attach and detach calls. */

void hw_port_attach

(struct hw *me,

 int my_port,

 struct hw *dest,

 int dest_port,

 object_disposition disposition);

void hw_port_detach

(struct hw *me,

 int my_port,

 struct hw *dest,

 int dest_port);

/* Iterate over the list of ports attached to a device */

typedef void (hw_port_traverse_function)

     (struct hw *me,

      int my_port,

      struct hw *dest,

      int dest_port,

      void *data);

void hw_port_traverse

(struct hw *me,

 hw_port_traverse_function *handler,

 void *data);

/* DESTINATION is attached (detached) to LINE of the device ME

   Port conversion

   Users refer to port numbers symbolically.  For instance a device

   may refer to its `INT' signal which is internally represented by

   port 3.

   To convert to/from the symbolic and internal representation of a

   port name/number.  The following functions are available. */

int hw_port_decode

(struct hw *me,

 const char *symbolic_name,

 port_direction direction);

int hw_port_encode

(struct hw *me,

 int port_number,

 char *buf,

 int sizeof_buf,

 port_direction direction);

#endif