binutils-gdb/sim/common/hw-events.c

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/* Hardware event manager.
Copyright (C) 1998 Free Software Foundation, Inc.
Contributed by Cygnus Support.
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 2, 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, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "sim-main.h"
#include "hw-base.h"
#include "sim-events.h"
/* The hw-events object is implemented using sim-events */
struct hw_event {
void *data;
struct hw *me;
hw_event_callback *callback;
sim_event *real;
struct hw_event_data *entry;
};
struct hw_event_data {
struct hw_event event;
struct hw_event_data *next;
struct hw_event_data **prev;
};
void
create_hw_event_data (struct hw *me)
{
/* NOP */
}
void
delete_hw_event_data (struct hw *me)
{
if (me->events_of_hw != NULL)
hw_abort (me, "stray events");
}
static void
delete_hw_event (struct hw *me,
struct hw_event **event)
{
struct hw_event_data *entry = (*event)->entry;
*(entry->prev) = entry->next;
entry->next->prev = entry->prev;
(*event) = NULL;
}
static void
create_hw_event (struct hw *me,
struct hw_event **event)
{
struct hw_event_data *entry = HW_ZALLOC (me, struct hw_event_data);
entry->next = me->events_of_hw;
entry->prev = &me->events_of_hw;
me->events_of_hw->prev = &entry->next;
me->events_of_hw = entry;
(*event) = &entry->event;
}
/* Pass the H/W event onto the real callback */
static void
bounce_hw_event (SIM_DESC sd,
void *data)
{
/* save the data */
struct hw_event *event = (struct hw_event*)data;
struct hw *me = event->me;
void *event_data = event->data;
hw_event_callback *callback = event->callback;
hw_free (me, data);
event = NULL;
callback (me, event_data);
}
/* Map onto the event functions */
struct hw_event *
hw_event_queue_schedule (struct hw *me,
signed64 delta_time,
hw_event_callback *callback,
void *data)
{
struct hw_event *event;
create_hw_event (me, &event);
/* fill it in */
event->data = data;
event->callback = callback;
event->me = me;
event->real = sim_events_schedule (hw_system (me),
delta_time,
bounce_hw_event,
event);
return event;
}
void
hw_event_queue_deschedule (struct hw *me,
struct hw_event *event_to_remove)
{
/* remove it from the event queue */
sim_events_deschedule (hw_system (me),
event_to_remove->real);
delete_hw_event (me, &event_to_remove);
}
signed64
hw_event_queue_time (struct hw *me)
{
return sim_events_time (hw_system (me));
}