sim/common/hw-ports.h

   1 /* Hardware ports.
   2    Copyright (C) 1998, 2007 Free Software Foundation, Inc.
   3    Contributed by Andrew Cagney and Cygnus Solutions.
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #ifndef HW_PORTS_H
  22 #define HW_PORTS_H
  23
  24 /* Initialize a port */
  25
  26 struct hw_port_descriptor {
  27   const char *name;
  28   int number;
  29   int nr_ports;
  30   port_direction direction;
  31 };
  32
  33 void set_hw_ports (struct hw *hw, const struct hw_port_descriptor ports[]);
  34
  35 typedef void (hw_port_event_method)
  36      (struct hw *me,
  37       int my_port,
  38       struct hw *source,
  39       int source_port,
  40       int level);
  41
  42 void set_hw_port_event (struct hw *hw, hw_port_event_method *to_port_event);
  43
  44
  45 /* Port source
  46
  47    A device drives its output ports using the call
  48
  49    */
  50
  51 void hw_port_event
  52 (struct hw *me,
  53  int my_port,
  54  int value);
  55
  56 /* This port event will then be propogated to any attached
  57    destination ports.
  58
  59    Any interpretation of PORT and VALUE is model dependant.  As a
  60    guideline the following are recommended: PCI interrupts A-D should
  61    correspond to ports 0-3; level sensative interrupts be requested
  62    with a value of one and withdrawn with a value of 0; edge sensative
  63    interrupts always have a value of 1, the event its self is treated
  64    as the interrupt.
  65
  66
  67    Port destinations
  68
  69    Attached to each port of a device can be zero or more
  70    desitinations.  These destinations consist of a device/port pair.
  71    A destination is attached/detached to a device line using the
  72    attach and detach calls. */
  73
  74 void hw_port_attach
  75 (struct hw *me,
  76  int my_port,
  77  struct hw *dest,
  78  int dest_port,
  79  object_disposition disposition);
  80
  81 void hw_port_detach
  82 (struct hw *me,
  83  int my_port,
  84  struct hw *dest,
  85  int dest_port);
  86
  87
  88 /* Iterate over the list of ports attached to a device */
  89
  90 typedef void (hw_port_traverse_function)
  91      (struct hw *me,
  92       int my_port,
  93       struct hw *dest,
  94       int dest_port,
  95       void *data);
  96
  97 void hw_port_traverse
  98 (struct hw *me,
  99  hw_port_traverse_function *handler,
 100  void *data);
 101
 102
 103 /* DESTINATION is attached (detached) to LINE of the device ME
 104
 105
 106    Port conversion
 107
 108    Users refer to port numbers symbolically.  For instance a device
 109    may refer to its `INT' signal which is internally represented by
 110    port 3.
 111
 112    To convert to/from the symbolic and internal representation of a
 113    port name/number.  The following functions are available. */
 114
 115 int hw_port_decode
 116 (struct hw *me,
 117  const char *symbolic_name,
 118  port_direction direction);
 119
 120 int hw_port_encode
 121 (struct hw *me,
 122  int port_number,
 123  char *buf,
 124  int sizeof_buf,
 125  port_direction direction);
 126
 127
 128 #endif