276 lines
6.4 KiB
C
276 lines
6.4 KiB
C
/* Hardware event manager.
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Copyright (C) 1998-2016 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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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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#include "hw-main.h"
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#include "hw-base.h"
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#include "sim-events.h"
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/* The hw-events object is implemented using sim-events */
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struct hw_event
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{
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void *data;
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struct hw *me;
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hw_event_callback *callback;
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sim_event *real;
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struct hw_event_data *entry;
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};
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struct hw_event_data
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{
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struct hw_event event;
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struct hw_event_data *next;
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};
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void
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create_hw_event_data (struct hw *me)
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{
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if (me->events_of_hw != NULL)
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hw_abort (me, "stray events");
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/* NOP */
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}
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void
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delete_hw_event_data (struct hw *me)
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{
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/* Remove the scheduled event. */
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while (me->events_of_hw)
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hw_event_queue_deschedule (me, &me->events_of_hw->event);
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}
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/* Pass the H/W event onto the real callback */
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static void
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bounce_hw_event (SIM_DESC sd,
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void *data)
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{
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/* save the data */
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struct hw_event_data *entry = (struct hw_event_data *) data;
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struct hw *me = entry->event.me;
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void *event_data = entry->event.data;
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hw_event_callback *callback = entry->event.callback;
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struct hw_event_data **prev = &me->events_of_hw;
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while ((*prev) != entry)
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prev = &(*prev)->next;
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(*prev) = entry->next;
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hw_free (me, entry);
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callback (me, event_data); /* may not return */
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}
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/* Map onto the event functions */
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struct hw_event *
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hw_event_queue_schedule (struct hw *me,
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signed64 delta_time,
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hw_event_callback *callback,
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void *data)
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{
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struct hw_event *event;
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va_list dummy;
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memset (&dummy, 0, sizeof dummy);
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event = hw_event_queue_schedule_vtracef (me, delta_time, callback, data,
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NULL, dummy);
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return event;
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}
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struct hw_event *
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hw_event_queue_schedule_tracef (struct hw *me,
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signed64 delta_time,
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hw_event_callback *callback,
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void *data,
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const char *fmt,
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...)
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{
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struct hw_event *event;
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va_list ap;
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va_start (ap, fmt);
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event = hw_event_queue_schedule_vtracef (me, delta_time, callback, data, fmt, ap);
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va_end (ap);
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return event;
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}
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struct hw_event *
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hw_event_queue_schedule_vtracef (struct hw *me,
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signed64 delta_time,
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hw_event_callback *callback,
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void *data,
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const char *fmt,
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va_list ap)
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{
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struct hw_event_data *entry = HW_ZALLOC (me, struct hw_event_data);
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entry->next = me->events_of_hw;
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me->events_of_hw = entry;
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/* fill it in */
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entry->event.entry = entry;
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entry->event.data = data;
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entry->event.callback = callback;
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entry->event.me = me;
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entry->event.real = sim_events_schedule_vtracef (hw_system (me),
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delta_time,
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bounce_hw_event,
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entry,
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fmt, ap);
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return &entry->event;
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}
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void
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hw_event_queue_deschedule (struct hw *me,
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struct hw_event *event_to_remove)
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{
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/* ZAP the event but only if it is still in the event queue. Note
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that event_to_remove is only de-referenced after its validity has
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been confirmed. */
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struct hw_event_data **prev;
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for (prev = &me->events_of_hw;
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(*prev) != NULL;
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prev = &(*prev)->next)
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{
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struct hw_event_data *entry = (*prev);
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if (&entry->event == event_to_remove)
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{
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sim_events_deschedule (hw_system (me),
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entry->event.real);
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(*prev) = entry->next;
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hw_free (me, entry);
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return;
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}
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}
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}
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signed64
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hw_event_queue_time (struct hw *me)
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{
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return sim_events_time (hw_system (me));
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}
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/* Returns the time that remains before the event is raised. */
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signed64
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hw_event_remain_time (struct hw *me, struct hw_event *event)
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{
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signed64 t;
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t = sim_events_remain_time (hw_system (me), event->real);
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return t;
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}
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/* Only worry about this compling on ANSI systems.
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Build with `make test-hw-events' in sim/<cpu> directory*/
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#if defined (MAIN)
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#include "sim-main.h"
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#include <string.h>
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#include <stdio.h>
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static void
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test_handler (struct hw *me,
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void *data)
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{
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int *n = data;
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if (*n != hw_event_queue_time (me))
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abort ();
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*n = -(*n);
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}
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int
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main (int argc,
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char **argv)
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{
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host_callback *cb = ZALLOC (host_callback);
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struct sim_state *sd = sim_state_alloc (0, cb);
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struct hw *me = ZALLOC (struct hw);
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sim_pre_argv_init (sd, "test-hw-events");
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sim_post_argv_init (sd);
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me->system_of_hw = sd;
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printf ("Create hw-event-data\n");
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{
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create_hw_alloc_data (me);
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create_hw_event_data (me);
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delete_hw_event_data (me);
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delete_hw_alloc_data (me);
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}
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printf ("Create hw-events\n");
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{
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struct hw_event *a;
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struct hw_event *b;
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struct hw_event *c;
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struct hw_event *d;
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create_hw_alloc_data (me);
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create_hw_event_data (me);
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a = hw_event_queue_schedule (me, 0, NULL, NULL);
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b = hw_event_queue_schedule (me, 1, NULL, NULL);
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c = hw_event_queue_schedule (me, 2, NULL, NULL);
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d = hw_event_queue_schedule (me, 1, NULL, NULL);
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hw_event_queue_deschedule (me, c);
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hw_event_queue_deschedule (me, b);
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hw_event_queue_deschedule (me, a);
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hw_event_queue_deschedule (me, d);
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c = HW_ZALLOC (me, struct hw_event);
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hw_event_queue_deschedule (me, b); /* OOPS! */
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hw_free (me, c);
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delete_hw_event_data (me);
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delete_hw_alloc_data (me);
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}
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printf ("Schedule hw-events\n");
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{
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struct hw_event **e;
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int *n;
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int i;
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int nr = 4;
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e = HW_NZALLOC (me, struct hw_event *, nr);
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n = HW_NZALLOC (me, int, nr);
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create_hw_alloc_data (me);
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create_hw_event_data (me);
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for (i = 0; i < nr; i++)
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{
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n[i] = i;
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e[i] = hw_event_queue_schedule (me, i, test_handler, &n[i]);
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}
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sim_events_preprocess (sd, 1, 1);
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for (i = 0; i < nr; i++)
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{
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if (sim_events_tick (sd))
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sim_events_process (sd);
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}
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for (i = 0; i < nr; i++)
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{
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if (n[i] != -i)
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abort ();
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hw_event_queue_deschedule (me, e[i]);
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}
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hw_free (me, n);
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hw_free (me, e);
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delete_hw_event_data (me);
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delete_hw_alloc_data (me);
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}
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return 0;
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}
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#endif
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