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130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/* Hardware ports.
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Copyright (C) 1998-2021 Free Software Foundation, Inc.
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Contributed by Andrew Cagney and Cygnus Solutions.
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This file is part of GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef HW_PORTS_H
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#define HW_PORTS_H
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/* Initialize a port */
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struct hw_port_descriptor
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{
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const char *name;
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int number;
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int nr_ports;
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port_direction direction;
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};
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void set_hw_ports (struct hw *hw, const struct hw_port_descriptor ports[]);
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typedef void (hw_port_event_method)
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(struct hw *me,
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int my_port,
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struct hw *source,
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int source_port,
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int level);
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void set_hw_port_event (struct hw *hw, hw_port_event_method *to_port_event);
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/* Port source
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A device drives its output ports using the call
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*/
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void hw_port_event
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(struct hw *me,
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int my_port,
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int value);
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/* This port event will then be propagated to any attached
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destination ports.
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Any interpretation of PORT and VALUE is model dependent. As a
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guideline the following are recommended: PCI interrupts A-D should
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correspond to ports 0-3; level sensitive interrupts be requested
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with a value of one and withdrawn with a value of 0; edge sensitive
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interrupts always have a value of 1, the event its self is treated
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as the interrupt.
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Port destinations
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Attached to each port of a device can be zero or more
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destinations. These destinations consist of a device/port pair.
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A destination is attached/detached to a device line using the
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attach and detach calls. */
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void hw_port_attach
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(struct hw *me,
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int my_port,
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struct hw *dest,
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int dest_port,
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object_disposition disposition);
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void hw_port_detach
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(struct hw *me,
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int my_port,
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struct hw *dest,
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int dest_port);
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/* Iterate over the list of ports attached to a device */
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typedef void (hw_port_traverse_function)
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(struct hw *me,
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int my_port,
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struct hw *dest,
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int dest_port,
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void *data);
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void hw_port_traverse
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(struct hw *me,
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hw_port_traverse_function *handler,
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void *data);
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/* DESTINATION is attached (detached) to LINE of the device ME
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Port conversion
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Users refer to port numbers symbolically. For instance a device
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may refer to its `INT' signal which is internally represented by
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port 3.
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To convert to/from the symbolic and internal representation of a
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port name/number. The following functions are available. */
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int hw_port_decode
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(struct hw *me,
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const char *symbolic_name,
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port_direction direction);
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int hw_port_encode
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(struct hw *me,
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int port_number,
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char *buf,
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int sizeof_buf,
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port_direction direction);
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#endif
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