/**

  * $Id: eventq.h,v 1.1 2007-01-06 04:06:36 nkeynes Exp $

  *

  * Simple implementation of one-shot timers. Effectively this allows IO

  * devices to wait until a particular time before completing. We expect 

  * there to be at least half a dozen or so continually scheduled events

  * (TMU and PVR2), peaking around 20+.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * 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 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.

  */

 #include "dream.h"

 #define NOT_SCHEDULED 0xFFFFFFFF /* Sentinel value */

 typedef void (*event_func_t)(int eventid);

 /**

  * Register the callback to be associated with the given event ID.

  * Note: These should be registered at init time and never changed.

  */

 void register_event_callback( int eventid, event_func_t func );

 /**

  * Schedule a new pending event.

  * @param eventid Unique ID identifying the event in question (used to remove it

  * at a later time). If the eventid is scheduled more than once, only the lastest

  * schedule for that ID will be valid.

  * @param nanosecs Nanoseconds from the current SH4 time at which the event

  * should occur.

  */

 void event_schedule( int eventid, uint32_t nanosecs );

 /**

  * Schedule a long-duration pending event

  */

 void event_schedule_long( int eventid, uint32_t seconds, uint32_t nanosecs );

 /**

  * Remove a previously created event without triggering it. This is usually

  * only used when an operation is aborted.

  */

 void event_cancel( int eventid );

 /**

  * Return the slice cycle time of the next event, or NOT_SCHEDULED

  * if no events are scheduled for this time slice.

  */

 uint32_t event_get_next_time();

 /**

  * Execute the event on the top of the queue, and remove it.

  */

 void event_execute();

 #define MAX_EVENT_ID 128

 /* Events 1..96 are defined as the corresponding ASIC events. */