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/* Hardware ports.
Copyright (C) 1998-2021 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 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/>. */
#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 propagated to any attached
destination ports.
Any interpretation of PORT and VALUE is model dependent. As a
guideline the following are recommended: PCI interrupts A-D should
correspond to ports 0-3; level sensitive interrupts be requested
with a value of one and withdrawn with a value of 0; edge sensitive
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
destinations. 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
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