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lxdream.org :: lxdream/src/eventq.h
lxdream 0.9.1
released Jun 29
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filename src/eventq.h
changeset 619:0800a0137472
prev561:533f6b478071
next736:a02d1475ccfd
author nkeynes
date Wed Jan 30 09:38:24 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Deliver TMU interrupts precisely rather than only at end of time slice
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     1 /**
     2  * $Id$
     3  *
     4  * Simple implementation of one-shot timers. Effectively this allows IO
     5  * devices to wait until a particular time before completing. We expect 
     6  * there to be at least half a dozen or so continually scheduled events
     7  * (TMU and PVR2), peaking around 20+.
     8  *
     9  * Copyright (c) 2005 Nathan Keynes.
    10  *
    11  * This program is free software; you can redistribute it and/or modify
    12  * it under the terms of the GNU General Public License as published by
    13  * the Free Software Foundation; either version 2 of the License, or
    14  * (at your option) any later version.
    15  *
    16  * This program is distributed in the hope that it will be useful,
    17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    19  * GNU General Public License for more details.
    20  */
    22 #include "dream.h"
    24 #define NOT_SCHEDULED 0xFFFFFFFF /* Sentinel value */
    27 typedef void (*event_func_t)(int eventid);
    29 /**
    30  * Register the callback to be associated with the given event ID.
    31  * Note: These should be registered at init time and never changed.
    32  */
    33 void register_event_callback( int eventid, event_func_t func );
    35 /**
    36  * Schedule a new pending event.
    37  * @param eventid Unique ID identifying the event in question (used to remove it
    38  * at a later time). If the eventid is scheduled more than once, only the lastest
    39  * schedule for that ID will be valid.
    40  * @param nanosecs Nanoseconds from the current SH4 time at which the event
    41  * should occur.
    42  */
    43 void event_schedule( int eventid, uint32_t nanosecs );
    45 /**
    46  * Schedule a long-duration pending event
    47  */
    48 void event_schedule_long( int eventid, uint32_t seconds, uint32_t nanosecs );
    50 /**
    51  * Remove a previously created event without triggering it. This is usually
    52  * only used when an operation is aborted.
    53  */
    54 void event_cancel( int eventid );
    56 /**
    57  * Return the slice cycle time of the next event, or NOT_SCHEDULED
    58  * if no events are scheduled for this time slice.
    59  */
    60 uint32_t event_get_next_time();
    62 /**
    63  * Execute the event on the top of the queue, and remove it.
    64  */
    65 void event_execute();
    67 #define MAX_EVENT_ID 128
    69 /* Events 1..96 are defined as the corresponding ASIC events. */
    71 #define EVENT_TMU0 97
    72 #define EVENT_TMU1 98
    73 #define EVENT_TMU2 99
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