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/* $Id$
*
* Signal/Driver handling related functions.
*
* Copyright (C) 2008-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __SIGNALS_H_INCLUDED
#define __SIGNALS_H_INCLUDED
#include "fauhdli_private.h"
#include <stdbool.h>
/** a VHDL signal */
struct signal {
/** current signal value */
union fauhdli_value value;
/** set of drivers, that are connected to the signal */
struct slset *connected_drivers;
/** signal value was changed in the delta cycle. */
bool event;
/** is this a "foreign" signal? */
bool is_foreign;
/** id of the foreign signal */
unsigned int foreign_id;
/** associated resolution function (if any) */
const struct code_container *resolver;
};
/** a VHDL driver */
struct driver {
/** current driving value of the driver */
union fauhdli_value driving_value;
/** signal to which the driver is connected to (or NULL) */
struct signal *connected_signal;
/** is the driver active during this delta cycle? (i.e. it
* recieved any update)
* FIXME not set correctly!
*/
bool active;
/** transactions on the driver */
struct slset *transactions;
/** is this a foreign out driver? */
bool foreign_out;
/** id of the foreign signal (if any) */
unsigned int foreign_id;
};
/** connect a driver to a signal
* @param driver driver that should get connected to signal
* @param signal signal that the driver should get connected to.
* @param instance fauhdli instance.
* @return true if it is a foreign driver, false otherwise.
*/
extern bool
driver_connect(
struct driver *driver,
struct signal *_signal,
struct fauhdli *instance
);
/** create a driver at *driver_p.
* @param init initial value of the driver.
* @param callbacks callbacks (for malloc)
* @return created driver instance.
*/
extern
struct driver *
driver_create(union fauhdli_value init, const struct glue_vhdl_cb *callbacks);
/** destroy a driver (freeing the memory).
* @param driver driver to destroy
* @param callbacks for free.
*/
extern void
driver_destroy(struct driver *driver, const struct glue_vhdl_cb *callbacks);
/** update a driver with a new value after a specific delay.
* @param driver driver instance.
* @param val new driving value.
* @param sim_time simulation time at which the update should be
* performed.
* @param callbacks callbacks for malloc.
*/
extern void
driver_update(
struct driver *driver,
union fauhdli_value val,
universal_integer sim_time,
const struct glue_vhdl_cb *callbacks
);
/** propagate the driving value to the (foreign) signal via
* glue-vhdl.
* @param instance fauhdli instance.
* @param driver driver to propagate the value to the signal
* @param sim_time current simulation time.
*/
extern void
driver_forward_foreign(
struct fauhdli *instance,
struct driver *driver,
universal_integer sim_time
);
/** propagate all driving values of the drivers to the signal.
* foreign_out drivers will not get propagated.
*
* @param instance fauhdli instance
* @param sig signal which should get updated.
* @param sim_time current simulation time.
*/
extern void
signal_drivers_propagate(
struct fauhdli *instance,
struct signal *sig,
universal_integer sim_time
);
/** determine the time of the next event on a driver.
* @param drv driver instance.
* @return scheduled simulation time of next event, or INT64_MAX in case
* no event is scheduled.
*/
extern
universal_integer
driver_get_next_event(const struct driver *drv);
/** create a VHDL signal. If foreign is specified, a foreign signal will
* additionally get created.
* @param init initial value of the signal.
* @param foreign name of foreign signal to create, or NULL if not foreign.
* @param instance fauhdli instance.
* @param name name for debugging only
* @param resolver resolution function container (or NULL if unresolved)
* @return pointer to newly created signal.
*/
extern struct signal *
signal_create(
union fauhdli_value init,
const char *foreign,
struct fauhdli *instance,
const char *name,
const struct code_container *resolver
);
/** destroy a signal. This won't destroy the associated drivers.
* @param signal signal to destroy
* @param callbacks for free
*/
extern void
signal_destroy(struct signal *_signal, const struct glue_vhdl_cb *callbacks);
/** read the current value of a signal.
* @param signal read the signal value from this signal instance.
* @param val read value will be stored there.
*/
static inline void
__attribute__((__always_inline__))
signal_read(
const struct signal *sig,
union fauhdli_value *val
)
{
*val = sig->value;
}
/** clear the event flag of the signal
* @param sig signal to clear the event flag */
static inline void
__attribute__((__always_inline__))
signal_clear_event(struct signal *sig) {
sig->event = false;
}
/* If a foreign signal is read, create a driver for it, add the callback
* to glue_vhdl, and set the initial value.
* Will do nothing, if not a foreign signal, or the foreign driver is
* already created.
*
* @param sig signal instance.
* @param glue_vhdl glue_vhdl instance
* @param driver_set add the driver to driver_set.
*/
extern void
signal_connect_foreign_in_driver(
struct signal *sig,
struct fauhdli *instance,
struct slset *driver_set
);
#endif /* __SIGNALS_H_INCLUDED */
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