/*************************************************************************** timer.c Functions needed to generate timing and synchronization between several CPUs. Copyright (c) 1996-2007, Nicola Salmoria and the MAME Team. Visit http://mamedev.org for licensing and usage restrictions. ***************************************************************************/ #include "driver.h" #include "profiler.h" #include "pool.h" #include /*************************************************************************** DEBUGGING ***************************************************************************/ #define VERBOSE 0 #define LOG(x) do { if (VERBOSE) logerror x; } while (0) /*************************************************************************** CONSTANTS ***************************************************************************/ #define MAX_TIMERS 256 /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ /* in timer.h: typedef struct _emu_timer emu_timer; */ struct _emu_timer { emu_timer * next; emu_timer * prev; timer_callback callback; INT32 param; void * ptr; const char * file; int line; const char * func; UINT8 enabled; UINT8 temporary; attotime period; attotime start; attotime expire; }; /*************************************************************************** GLOBAL VARIABLES ***************************************************************************/ /* conversion constants */ attoseconds_t attoseconds_per_cycle[MAX_CPU]; UINT32 cycles_per_second[MAX_CPU]; /* list of active timers */ static emu_timer timers[MAX_TIMERS]; static emu_timer *timer_head; static emu_timer *timer_free_head; static emu_timer *timer_free_tail; /* other internal states */ static attotime global_basetime; static emu_timer *callback_timer; static int callback_timer_modified; static attotime callback_timer_expire_time; /*************************************************************************** FUNCTION PROTOTYPES ***************************************************************************/ static void timer_postload(void); static void timer_logtimers(void); static void timer_remove(emu_timer *which); /*************************************************************************** INLINE FUNCTIONS ***************************************************************************/ /*------------------------------------------------- get_current_time - return the current time -------------------------------------------------*/ INLINE attotime get_current_time(void) { int activecpu; /* if we're currently in a callback, use the timer's expiration time as a base */ if (callback_timer != NULL) return callback_timer_expire_time; /* if we're executing as a particular CPU, use its local time as a base */ activecpu = cpu_getactivecpu(); if (activecpu >= 0) return cpunum_get_localtime(activecpu); /* otherwise, return the current global base time */ return global_basetime; } /*------------------------------------------------- timer_new - allocate a new timer -------------------------------------------------*/ INLINE emu_timer *timer_new(void) { emu_timer *timer; /* remove an empty entry */ if (!timer_free_head) { timer_logtimers(); fatalerror("Out of timers!"); } timer = timer_free_head; timer_free_head = timer->next; if (!timer_free_head) timer_free_tail = NULL; return timer; } /*------------------------------------------------- timer_list_insert - insert a new timer into the list at the appropriate location -------------------------------------------------*/ INLINE void timer_list_insert(emu_timer *timer) { attotime expire = timer->enabled ? timer->expire : attotime_never; emu_timer *t, *lt = NULL; /* sanity checks for the debug build */ #ifdef MAME_DEBUG { int tnum = 0; /* loop over the timer list */ for (t = timer_head; t; t = t->next, tnum++) { if (t == timer) fatalerror("This timer is already inserted in the list!"); if (tnum == MAX_TIMERS-1) fatalerror("Timer list is full!"); } } #endif /* loop over the timer list */ for (t = timer_head; t; lt = t, t = t->next) { /* if the current list entry expires after us, we should be inserted before it */ if (attotime_compare(t->expire, expire) > 0) { /* link the new guy in before the current list entry */ timer->prev = t->prev; timer->next = t; if (t->prev) t->prev->next = timer; else timer_head = timer; t->prev = timer; return; } } /* need to insert after the last one */ if (lt) lt->next = timer; else timer_head = timer; timer->prev = lt; timer->next = NULL; } /*------------------------------------------------- timer_list_remove - remove a timer from the linked list -------------------------------------------------*/ INLINE void timer_list_remove(emu_timer *timer) { /* sanity checks for the debug build */ #ifdef MAME_DEBUG { emu_timer *t; /* loop over the timer list */ for (t = timer_head; t && t != timer; t = t->next) ; if (t == NULL) fatalerror("timer (%s from %s:%d) not found in list", timer->func, timer->file, timer->line); } #endif /* remove it from the list */ if (timer->prev) timer->prev->next = timer->next; else timer_head = timer->next; if (timer->next) timer->next->prev = timer->prev; } /*************************************************************************** INITIALIZATION ***************************************************************************/ /*------------------------------------------------- timer_init - initialize the timer system -------------------------------------------------*/ void timer_init(running_machine *machine) { int i; /* we need to wait until the first call to timer_cyclestorun before using real CPU times */ global_basetime = attotime_zero; callback_timer = NULL; callback_timer_modified = FALSE; /* register with the save state system */ state_save_push_tag(0); state_save_register_item("timer", 0, global_basetime.seconds); state_save_register_item("timer", 0, global_basetime.attoseconds); state_save_register_func_postload(timer_postload); state_save_pop_tag(); /* reset the timers */ memset(timers, 0, sizeof(timers)); /* initialize the lists */ timer_head = NULL; timer_free_head = &timers[0]; for (i = 0; i < MAX_TIMERS-1; i++) timers[i].next = &timers[i+1]; timers[MAX_TIMERS-1].next = NULL; timer_free_tail = &timers[MAX_TIMERS-1]; } /*------------------------------------------------- timer_destructor - destruct a timer from a pool callback -------------------------------------------------*/ void timer_destructor(void *ptr, size_t size) { timer_remove(ptr); } /*************************************************************************** SCHEDULING HELPERS ***************************************************************************/ /*------------------------------------------------- timer_next_fire_time - return the time when the next timer will fire -------------------------------------------------*/ attotime timer_next_fire_time(void) { return timer_head->expire; } /*------------------------------------------------- timer_adjust_global_time - adjust the global time; this is also where we fire the timers -------------------------------------------------*/ void timer_set_global_time(attotime newbase) { emu_timer *timer; /* set the new global offset */ global_basetime = newbase; LOG(("timer_set_global_time: new=%s head->expire=%s\n", attotime_string(newbase, 9), attotime_string(timer_head->expire, 9))); /* now process any timers that are overdue */ while (attotime_compare(timer_head->expire, global_basetime) <= 0) { int was_enabled = timer_head->enabled; /* if this is a one-shot timer, disable it now */ timer = timer_head; if (attotime_compare(timer->period, attotime_zero) == 0 || attotime_compare(timer->period, attotime_never) == 0) timer->enabled = FALSE; /* set the global state of which callback we're in */ callback_timer_modified = FALSE; callback_timer = timer; callback_timer_expire_time = timer->expire; /* call the callback */ if (was_enabled && timer->callback != NULL) { LOG(("Timer %s:%d[%s] fired (expire=%s)\n", timer->file, timer->line, timer->func, attotime_string(timer->expire, 9))); profiler_mark(PROFILER_TIMER_CALLBACK); (*timer->callback)(Machine, timer->ptr, timer->param); profiler_mark(PROFILER_END); } /* clear the callback timer global */ callback_timer = NULL; /* reset or remove the timer, but only if it wasn't modified during the callback */ if (!callback_timer_modified) { /* if the timer is temporary, remove it now */ if (timer->temporary) timer_remove(timer); /* otherwise, reschedule it */ else { timer->start = timer->expire; timer->expire = attotime_add(timer->expire, timer->period); timer_list_remove(timer); timer_list_insert(timer); } } } } /*************************************************************************** SAVE/RESTORE HELPERS ***************************************************************************/ /*------------------------------------------------- timer_register_save - register ourself with the save state system -------------------------------------------------*/ static void timer_register_save(emu_timer *timer) { char buf[256]; int count = 0; emu_timer *t; /* find other timers that match our func name */ for (t = timer_head; t; t = t->next) if (!strcmp(t->func, timer->func)) count++; /* make up a name */ sprintf(buf, "timer.%s", timer->func); /* use different instances to differentiate the bits */ state_save_push_tag(0); state_save_register_item(buf, count, timer->param); state_save_register_item(buf, count, timer->enabled); state_save_register_item(buf, count, timer->period.seconds); state_save_register_item(buf, count, timer->period.attoseconds); state_save_register_item(buf, count, timer->start.seconds); state_save_register_item(buf, count, timer->start.attoseconds); state_save_register_item(buf, count, timer->expire.seconds); state_save_register_item(buf, count, timer->expire.attoseconds); state_save_pop_tag(); } /*------------------------------------------------- timer_postload - after loading a save state -------------------------------------------------*/ static void timer_postload(void) { emu_timer *privlist = NULL; emu_timer *t; /* remove all timers and make a private list */ while (timer_head != NULL) { t = timer_head; /* temporary timers go away entirely */ if (t->temporary) timer_remove(t); /* permanent ones get added to our private list */ else { timer_list_remove(t); t->next = privlist; privlist = t; } } /* now add them all back in; this effectively re-sorts them by time */ while (privlist != NULL) { t = privlist; privlist = t->next; timer_list_insert(t); } } /*------------------------------------------------- timer_count_anonymous - count the number of anonymous (non-saveable) timers -------------------------------------------------*/ int timer_count_anonymous(void) { emu_timer *t; int count = 0; logerror("timer_count_anonymous:\n"); for (t = timer_head; t; t = t->next) if (t->temporary && t != callback_timer) { count++; logerror(" Temp. timer %p, file %s:%d[%s]\n", (void *) t, t->file, t->line, t->func); } logerror("%d temporary timers found\n", count); return count; } /*************************************************************************** CORE TIMER ALLOCATION ***************************************************************************/ /*------------------------------------------------- timer_alloc - allocate a permament timer that isn't primed yet -------------------------------------------------*/ INLINE emu_timer *_timer_alloc_common(timer_callback callback, void *ptr, const char *file, int line, const char *func, int temp) { attotime time = get_current_time(); emu_timer *timer = timer_new(); /* fill in the record */ timer->callback = callback; timer->ptr = ptr; timer->param = 0; timer->enabled = FALSE; timer->temporary = temp; timer->period = attotime_zero; timer->file = file; timer->line = line; timer->func = func; /* compute the time of the next firing and insert into the list */ timer->start = time; timer->expire = attotime_never; timer_list_insert(timer); /* if we're not temporary, register ourselve with the save state system */ if (!temp) { timer_register_save(timer); restrack_register_object(OBJTYPE_TIMER, timer, 0, file, line); } /* return a handle */ return timer; } emu_timer *_timer_alloc_internal(timer_callback callback, void *ptr, const char *file, int line, const char *func) { return _timer_alloc_common(callback, ptr, file, line, func, FALSE); } /*------------------------------------------------- timer_remove - remove a timer from the system -------------------------------------------------*/ static void timer_remove(emu_timer *which) { /* if this is a callback timer, note that */ if (which == callback_timer) callback_timer_modified = TRUE; /* remove it from the list */ timer_list_remove(which); /* free it up by adding it back to the free list */ if (timer_free_tail) timer_free_tail->next = which; else timer_free_head = which; which->next = NULL; timer_free_tail = which; } /*************************************************************************** CORE TIMER ADJUSTMENT ***************************************************************************/ /*------------------------------------------------- timer_adjust - adjust the time when this timer will fire, and whether or not it will fire periodically -------------------------------------------------*/ void timer_adjust(emu_timer *which, attotime duration, INT32 param, attotime period) { attotime time = get_current_time(); /* if this is the callback timer, mark it modified */ if (which == callback_timer) callback_timer_modified = TRUE; /* compute the time of the next firing and insert into the list */ which->param = param; which->enabled = TRUE; /* clamp negative times to 0 */ if (duration.seconds < 0) duration = attotime_zero; /* set the start and expire times */ which->start = time; which->expire = attotime_add(time, duration); which->period = period; /* remove and re-insert the timer in its new order */ timer_list_remove(which); timer_list_insert(which); /* if this was inserted as the head, abort the current timeslice and resync */ LOG(("timer_adjust %s.%s:%d to expire @ %s\n", which->file, which->func, which->line, attotime_string(which->expire, 9))); if (which == timer_head && cpu_getexecutingcpu() >= 0) activecpu_abort_timeslice(); } /*************************************************************************** SIMPLIFIED ANONYMOUS TIMER MANAGEMENT ***************************************************************************/ /*------------------------------------------------- timer_pulse - allocate a pulse timer, which repeatedly calls the callback using the given period -------------------------------------------------*/ void _timer_pulse_internal(attotime period, void *ptr, INT32 param, timer_callback callback, const char *file, int line, const char *func) { emu_timer *timer = _timer_alloc_common(callback, ptr, file, line, func, FALSE); timer_adjust(timer, period, param, period); } /*------------------------------------------------- timer_set - allocate a one-shot timer, which calls the callback after the given duration -------------------------------------------------*/ void _timer_set_internal(attotime duration, void *ptr, INT32 param, timer_callback callback, const char *file, int line, const char *func) { emu_timer *timer = _timer_alloc_common(callback, ptr, file, line, func, TRUE); timer_adjust(timer, duration, param, attotime_zero); } /*************************************************************************** MISCELLANEOUS CONTROLS ***************************************************************************/ /*------------------------------------------------- timer_reset - reset the timing on a timer -------------------------------------------------*/ void timer_reset(emu_timer *which, attotime duration) { timer_adjust(which, duration, which->param, which->period); } /*------------------------------------------------- timer_enable - enable/disable a timer -------------------------------------------------*/ int timer_enable(emu_timer *which, int enable) { int old; /* set the enable flag */ old = which->enabled; which->enabled = enable; /* remove the timer and insert back into the list */ timer_list_remove(which); timer_list_insert(which); return old; } /*------------------------------------------------- timer_enabled - determine if a timer is enabled -------------------------------------------------*/ int timer_enabled(emu_timer *which) { return which->enabled; } /*------------------------------------------------- timer_get_param timer_get_param_ptr - returns the callback parameter of a timer -------------------------------------------------*/ int timer_get_param(emu_timer *which) { return which->param; } void *timer_get_param_ptr(emu_timer *which) { return which->ptr; } /*************************************************************************** TIMING FUNCTIONS ***************************************************************************/ /*------------------------------------------------- timer_timeelapsed - return the time since the last trigger -------------------------------------------------*/ attotime timer_timeelapsed(emu_timer *which) { return attotime_sub(get_current_time(), which->start); } /*------------------------------------------------- timer_timeleft - return the time until the next trigger -------------------------------------------------*/ attotime timer_timeleft(emu_timer *which) { return attotime_sub(which->expire, get_current_time()); } /*------------------------------------------------- timer_get_time - return the current time -------------------------------------------------*/ attotime timer_get_time(void) { return get_current_time(); } /*------------------------------------------------- timer_starttime - return the time when this timer started counting -------------------------------------------------*/ attotime timer_starttime(emu_timer *which) { return which->start; } /*------------------------------------------------- timer_firetime - return the time when this timer will fire next -------------------------------------------------*/ attotime timer_firetime(emu_timer *which) { return which->expire; } /*************************************************************************** DEBUGGING ***************************************************************************/ /*------------------------------------------------- timer_logtimers - log all the timers -------------------------------------------------*/ static void timer_logtimers(void) { emu_timer *t; logerror("===============\n"); logerror("TIMER LOG START\n"); logerror("===============\n"); logerror("Enqueued timers:\n"); for (t = timer_head; t; t = t->next) logerror(" Start=%15.6f Exp=%15.6f Per=%15.6f Ena=%d Tmp=%d (%s:%d[%s])\n", attotime_to_double(t->start), attotime_to_double(t->expire), attotime_to_double(t->period), t->enabled, t->temporary, t->file, t->line, t->func); logerror("Free timers:\n"); for (t = timer_free_head; t; t = t->next) logerror(" Start=%15.6f Exp=%15.6f Per=%15.6f Ena=%d Tmp=%d (%s:%d[%s])\n", attotime_to_double(t->start), attotime_to_double(t->expire), attotime_to_double(t->period), t->enabled, t->temporary, t->file, t->line, t->func); logerror("==============\n"); logerror("TIMER LOG STOP\n"); logerror("==============\n"); }