summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/diexec.c
blob: b404baba37566529a38029824fa81c8d18e9e9c1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
/***************************************************************************

    diexec.c

    Device execution interfaces.

****************************************************************************

    Copyright Aaron Giles
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

***************************************************************************/

#include "emu.h"
#include "profiler.h"
#include "debugger.h"


//**************************************************************************
//  DEBUGGING
//**************************************************************************

#define VERBOSE 0

#define LOG(x)	do { if (VERBOSE) logerror x; } while (0)

#define TEMPLOG	0



//**************************************************************************
//  CONSTANTS
//**************************************************************************

const int TRIGGER_INT			= -2000;
const int TRIGGER_SUSPENDTIME	= -4000;



//**************************************************************************
//  EXECUTING DEVICE CONFIG
//**************************************************************************

//-------------------------------------------------
//  device_config_execute_interface - constructor
//-------------------------------------------------

device_config_execute_interface::device_config_execute_interface(const machine_config &mconfig, device_config &devconfig)
	: device_config_interface(mconfig, devconfig),
	  m_disabled(false),
	  m_vblank_interrupt(NULL),
	  m_vblank_interrupts_per_frame(0),
	  m_vblank_interrupt_screen(NULL),
	  m_timed_interrupt(NULL),
	  m_timed_interrupt_period(attotime_zero)
{
}


//-------------------------------------------------
//  device_config_execute_interface - destructor
//-------------------------------------------------

device_config_execute_interface::~device_config_execute_interface()
{
}


//-------------------------------------------------
//  static_set_disable - configuration helper to
//  set the disabled state of a device
//-------------------------------------------------

void device_config_execute_interface::static_set_disable(device_config *device)
{
	device_config_execute_interface *exec = dynamic_cast<device_config_execute_interface *>(device);
	if (exec == NULL)
		throw emu_fatalerror("MCFG_DEVICE_DISABLE called on device '%s' with no execute interface", device->tag());
	exec->m_disabled = true;
}


//-------------------------------------------------
//  static_set_vblank_int - configuration helper
//  to set up VBLANK interrupts on the device
//-------------------------------------------------

void device_config_execute_interface::static_set_vblank_int(device_config *device, device_interrupt_func function, const char *tag, int rate)
{
	device_config_execute_interface *exec = dynamic_cast<device_config_execute_interface *>(device);
	if (exec == NULL)
		throw emu_fatalerror("MCFG_DEVICE_VBLANK_INT called on device '%s' with no execute interface", device->tag());
	exec->m_vblank_interrupt = function;
	exec->m_vblank_interrupts_per_frame = rate;
	exec->m_vblank_interrupt_screen = tag;
}


//-------------------------------------------------
//  static_set_periodic_int - configuration helper
//  to set up periodic interrupts on the device
//-------------------------------------------------

void device_config_execute_interface::static_set_periodic_int(device_config *device, device_interrupt_func function, attotime rate)
{
	device_config_execute_interface *exec = dynamic_cast<device_config_execute_interface *>(device);
	if (exec == NULL)
		throw emu_fatalerror("MCFG_DEVICE_PERIODIC_INT called on device '%s' with no execute interface", device->tag());
	exec->m_timed_interrupt = function;
	exec->m_timed_interrupt_period = rate;
}


//-------------------------------------------------
//  execute_clocks_to_cycles - convert the number
//  of clocks to cycles, rounding down if necessary
//-------------------------------------------------

UINT64 device_config_execute_interface::execute_clocks_to_cycles(UINT64 clocks) const
{
	return clocks;
}


//-------------------------------------------------
//  execute_cycles_to_clocks - convert the number
//  of cycles to clocks, rounding down if necessary
//-------------------------------------------------

UINT64 device_config_execute_interface::execute_cycles_to_clocks(UINT64 cycles) const
{
	return cycles;
}


//-------------------------------------------------
//  execute_min_cycles - return the smallest number
//  of cycles that a single instruction or
//  operation can take
//-------------------------------------------------

UINT32 device_config_execute_interface::execute_min_cycles() const
{
	return 1;
}


//-------------------------------------------------
//  execute_max_cycles - return the maximum number
//  of cycles that a single instruction or
//  operation can take
//-------------------------------------------------

UINT32 device_config_execute_interface::execute_max_cycles() const
{
	return 1;
}


//-------------------------------------------------
//  execute_input_lines - return the total number
//  of input lines for the device
//-------------------------------------------------

UINT32 device_config_execute_interface::execute_input_lines() const
{
	return 0;
}


//-------------------------------------------------
//  execute_default_irq_vector - return the default
//  IRQ vector when an acknowledge is processed
//-------------------------------------------------

UINT32 device_config_execute_interface::execute_default_irq_vector() const
{
	return 0;
}


//-------------------------------------------------
//  interface_validity_check - validation for a
//  device after the configuration has been
//  constructed
//-------------------------------------------------

bool device_config_execute_interface::interface_validity_check(const game_driver &driver) const
{
	const device_config *devconfig = crosscast<const device_config *>(this);
	bool error = false;

	/* validate the interrupts */
	if (m_vblank_interrupt != NULL)
	{
		if (m_machine_config.m_devicelist.count(SCREEN) == 0)
		{
			mame_printf_error("%s: %s device '%s' has a VBLANK interrupt, but the driver is screenless!\n", driver.source_file, driver.name, devconfig->tag());
			error = true;
		}
		else if (m_vblank_interrupt_screen != NULL && m_vblank_interrupts_per_frame != 0)
		{
			mame_printf_error("%s: %s device '%s' has a new VBLANK interrupt handler with >1 interrupts!\n", driver.source_file, driver.name, devconfig->tag());
			error = true;
		}
		else if (m_vblank_interrupt_screen != NULL && m_machine_config.m_devicelist.find(m_vblank_interrupt_screen) == NULL)
		{
			mame_printf_error("%s: %s device '%s' VBLANK interrupt with a non-existant screen tag (%s)!\n", driver.source_file, driver.name, devconfig->tag(), m_vblank_interrupt_screen);
			error = true;
		}
		else if (m_vblank_interrupt_screen == NULL && m_vblank_interrupts_per_frame == 0)
		{
			mame_printf_error("%s: %s device '%s' has a VBLANK interrupt handler with 0 interrupts!\n", driver.source_file, driver.name, devconfig->tag());
			error = true;
		}
	}
	else if (m_vblank_interrupts_per_frame != 0)
	{
		mame_printf_error("%s: %s device '%s' has no VBLANK interrupt handler but a non-0 interrupt count is given!\n", driver.source_file, driver.name, devconfig->tag());
		error = true;
	}

	if (m_timed_interrupt != NULL && attotime_compare(m_timed_interrupt_period, attotime_zero) == 0)
	{
		mame_printf_error("%s: %s device '%s' has a timer interrupt handler with 0 period!\n", driver.source_file, driver.name, devconfig->tag());
		error = true;
	}
	else if (m_timed_interrupt == NULL && attotime_compare(m_timed_interrupt_period, attotime_zero) != 0)
	{
		mame_printf_error("%s: %s device '%s' has a no timer interrupt handler but has a non-0 period given!\n", driver.source_file, driver.name, devconfig->tag());
		error = true;
	}

	return error;
}



//**************************************************************************
//  EXECUTING DEVICE MANAGEMENT
//**************************************************************************

//-------------------------------------------------
//  device_execute_interface - constructor
//-------------------------------------------------

device_execute_interface::device_execute_interface(running_machine &machine, const device_config &config, device_t &device)
	: device_interface(machine, config, device),
	  m_machine(machine),
	  m_execute_config(dynamic_cast<const device_config_execute_interface &>(config)),
	  m_nextexec(NULL),
	  m_driver_irq(0),
	  m_timedint_timer(NULL),
	  m_iloops(0),
	  m_partial_frame_timer(NULL),
	  m_profiler(PROFILER_IDLE),
	  m_icountptr(NULL),
	  m_cycles_running(0),
	  m_cycles_stolen(0),
	  m_suspend(0),
	  m_nextsuspend(0),
	  m_eatcycles(0),
	  m_nexteatcycles(0),
	  m_trigger(0),
	  m_inttrigger(0),
	  m_totalcycles(0),
	  m_divisor(0),
	  m_divshift(0),
	  m_cycles_per_second(0),
	  m_attoseconds_per_cycle(0)
{
	memset(&m_localtime, 0, sizeof(m_localtime));
}


//-------------------------------------------------
//  ~device_execute_interface - destructor
//-------------------------------------------------

device_execute_interface::~device_execute_interface()
{
}


//-------------------------------------------------
//  executing - return true if this device is
//  within its execute function
//-------------------------------------------------

bool device_execute_interface::executing() const
{
	return (this == m_machine.scheduler().currently_executing());
}


//-------------------------------------------------
//  cycles_remaining - return the number of cycles
//  remaining in this timeslice
//-------------------------------------------------

INT32 device_execute_interface::cycles_remaining() const
{
	return executing() ? *m_icountptr : 0;
}


//-------------------------------------------------
//  eat_cycles - safely eats cycles so we don't
//  cross a timeslice boundary
//-------------------------------------------------

void device_execute_interface::eat_cycles(int cycles)
{
	// ignore if not the executing device
	if (!executing())
		return;

	// clamp cycles to the icount and update
	if (cycles > *m_icountptr)
		cycles = *m_icountptr;
	*m_icountptr -= cycles;
}


//-------------------------------------------------
//  adjust_icount - apply a +/- to the current
//  icount
//-------------------------------------------------

void device_execute_interface::adjust_icount(int delta)
{
	// ignore if not the executing device
	if (!executing())
		return;

	// aply the delta directly
	*m_icountptr += delta;
}


//-------------------------------------------------
//  abort_timeslice - abort execution for the
//  current timeslice, allowing other devices to
//  run before we run again
//-------------------------------------------------

void device_execute_interface::abort_timeslice()
{
	// ignore if not the executing device
	if (this != m_machine.scheduler().currently_executing())
		return;

	// swallow the remaining cycles
	if (m_icountptr != NULL)
	{
		int delta = *m_icountptr;
		m_cycles_stolen += delta;
		m_cycles_running -= delta;
		*m_icountptr -= delta;
	}
}


//-------------------------------------------------
//  set_irq_callback - install a driver-specific
//  callback for IRQ acknowledge
//-------------------------------------------------

void device_execute_interface::set_irq_callback(device_irq_callback callback)
{
	m_driver_irq = callback;
}


//-------------------------------------------------
//  suspend - set a suspend reason for this device
//-------------------------------------------------

void device_execute_interface::suspend(UINT32 reason, bool eatcycles)
{
if (TEMPLOG) printf("suspend %s (%X)\n", device().tag(), reason);
	// set the suspend reason and eat cycles flag
	m_nextsuspend |= reason;
	m_nexteatcycles = eatcycles;

	// if we're active, synchronize
	abort_timeslice();
}


//-------------------------------------------------
//  resume - clear a suspend reason for this
//  device
//-------------------------------------------------

void device_execute_interface::resume(UINT32 reason)
{
if (TEMPLOG) printf("resume %s (%X)\n", device().tag(), reason);
	// clear the suspend reason and eat cycles flag
	m_nextsuspend &= ~reason;

	// if we're active, synchronize
	abort_timeslice();
}


//-------------------------------------------------
//  spinuntil_time - burn cycles for a specific
//  period of time
//-------------------------------------------------

void device_execute_interface::spin_until_time(attotime duration)
{
	static int timetrig = 0;

	// suspend until the given trigger fires
	suspend_until_trigger(TRIGGER_SUSPENDTIME + timetrig, true);

	// then set a timer for it
	timer_set(&m_machine, duration, this, TRIGGER_SUSPENDTIME + timetrig, static_timed_trigger_callback);
	timetrig = (timetrig + 1) % 256;
}


//-------------------------------------------------
//  suspend_until_trigger - suspend execution
//  until the given trigger fires
//-------------------------------------------------

void device_execute_interface::suspend_until_trigger(int trigid, bool eatcycles)
{
	// suspend the device immediately if it's not already
	suspend(SUSPEND_REASON_TRIGGER, eatcycles);

	// set the trigger
	m_trigger = trigid;
}


//-------------------------------------------------
//  trigger - respond to a trigger event
//-------------------------------------------------

void device_execute_interface::trigger(int trigid)
{
	// if we're executing, for an immediate abort
	abort_timeslice();

	// see if this is a matching trigger
	if ((m_nextsuspend & SUSPEND_REASON_TRIGGER) != 0 && m_trigger == trigid)
	{
		resume(SUSPEND_REASON_TRIGGER);
		m_trigger = 0;
	}
}


//-------------------------------------------------
//  local_time - returns the current local time
//  for a device
//-------------------------------------------------

attotime device_execute_interface::local_time() const
{
	// if we're active, add in the time from the current slice
	attotime result = m_localtime;
	if (executing())
	{
		assert(m_cycles_running >= *m_icountptr);
		int cycles = m_cycles_running - *m_icountptr;
		result = attotime_add(result, cycles_to_attotime(cycles));
	}
	return result;
}


//-------------------------------------------------
//  total_cycles - return the total number of
//  cycles executed on this device
//-------------------------------------------------

UINT64 device_execute_interface::total_cycles() const
{
	if (executing())
	{
		assert(m_cycles_running >= *m_icountptr);
		return m_totalcycles + m_cycles_running - *m_icountptr;
	}
	else
		return m_totalcycles;
}


//-------------------------------------------------
//  execute_burn - called after we consume a bunch
//  of cycles for artifical reasons (such as
//  spinning devices for performance optimization)
//-------------------------------------------------

void device_execute_interface::execute_burn(INT32 cycles)
{
	// by default, do nothing
}


//-------------------------------------------------
//  execute_set_input - called when a synchronized
//  input is changed
//-------------------------------------------------

void device_execute_interface::execute_set_input(int linenum, int state)
{
	// by default, do nothing
}


//-------------------------------------------------
//  interface_pre_start - work to be done prior to
//  actually starting a device
//-------------------------------------------------

void device_execute_interface::interface_pre_start()
{
	// fill in the initial states
	int index = m_machine.m_devicelist.index(&m_device);
	m_suspend = SUSPEND_REASON_RESET;
	m_profiler = profile_type(index + PROFILER_DEVICE_FIRST);
	m_inttrigger = index + TRIGGER_INT;

	// fill in the input states and IRQ callback information
	for (int line = 0; line < ARRAY_LENGTH(m_input); line++)
		m_input[line].start(this, line);

	// allocate timers if we need them
	if (m_execute_config.m_vblank_interrupts_per_frame > 1)
		m_partial_frame_timer = timer_alloc(&m_machine, static_trigger_partial_frame_interrupt, (void *)this);
	if (attotime_compare(m_execute_config.m_timed_interrupt_period, attotime_zero) != 0)
		m_timedint_timer = timer_alloc(&m_machine, static_trigger_periodic_interrupt, (void *)this);

	// register for save states
	state_save_register_device_item(&m_device, 0, m_suspend);
	state_save_register_device_item(&m_device, 0, m_nextsuspend);
	state_save_register_device_item(&m_device, 0, m_eatcycles);
	state_save_register_device_item(&m_device, 0, m_nexteatcycles);
	state_save_register_device_item(&m_device, 0, m_trigger);
	state_save_register_device_item(&m_device, 0, m_totalcycles);
	state_save_register_device_item(&m_device, 0, m_localtime.seconds);
	state_save_register_device_item(&m_device, 0, m_localtime.attoseconds);
	state_save_register_device_item(&m_device, 0, m_iloops);
}


//-------------------------------------------------
//  interface_post_start - work to be done after
//  actually starting a device
//-------------------------------------------------

void device_execute_interface::interface_post_start()
{
	// make sure somebody set us up the icount
	assert_always(m_icountptr != NULL, "m_icountptr never initialized!");
}


//-------------------------------------------------
//  interface_pre_reset - work to be done prior to
//  actually resetting a device
//-------------------------------------------------

void device_execute_interface::interface_pre_reset()
{
	// reset the total number of cycles
	m_totalcycles = 0;

	// enable all devices (except for disabled devices)
	if (!m_execute_config.disabled())
		resume(SUSPEND_ANY_REASON);
	else
		suspend(SUSPEND_REASON_DISABLE, true);
}


//-------------------------------------------------
//  interface_post_reset - work to be done after a
//  device is reset
//-------------------------------------------------

void device_execute_interface::interface_post_reset()
{
	// reset the interrupt vectors and queues
	for (int line = 0; line < ARRAY_LENGTH(m_input); line++)
		m_input[line].reset();

	// reconfingure VBLANK interrupts
	if (m_execute_config.m_vblank_interrupts_per_frame > 0 || m_execute_config.m_vblank_interrupt_screen != NULL)
	{
		// get the screen that will trigger the VBLANK

		// new style - use screen tag directly
		screen_device *screen;
		if (m_execute_config.m_vblank_interrupt_screen != NULL)
			screen = downcast<screen_device *>(m_machine.device(m_execute_config.m_vblank_interrupt_screen));

		// old style 'hack' setup - use screen #0
		else
			screen = m_machine.first_screen();

		assert(screen != NULL);
		screen->register_vblank_callback(static_on_vblank, NULL);
	}

	// reconfigure periodic interrupts
	if (attotime_compare(m_execute_config.m_timed_interrupt_period, attotime_zero) != 0)
	{
		attotime timedint_period = m_execute_config.m_timed_interrupt_period;
		assert(m_timedint_timer != NULL);
		timer_adjust_periodic(m_timedint_timer, timedint_period, 0, timedint_period);
	}
}


//-------------------------------------------------
//  interface_clock_changed - recomputes clock
//  information for this device
//-------------------------------------------------

void device_execute_interface::interface_clock_changed()
{
	// recompute cps and spc
	m_cycles_per_second = clocks_to_cycles(m_device.clock());
	m_attoseconds_per_cycle = HZ_TO_ATTOSECONDS(m_cycles_per_second);

	// update the device's divisor
	INT64 attos = m_attoseconds_per_cycle;
	m_divshift = 0;
	while (attos >= (1UL << 31))
	{
		m_divshift++;
		attos >>= 1;
	}
	m_divisor = attos;

	// re-compute the perfect interleave factor
	m_machine.scheduler().compute_perfect_interleave();
}


//-------------------------------------------------
//  get_minimum_quantum - return the minimum
//  quantum required for this device
//-------------------------------------------------

attoseconds_t device_execute_interface::minimum_quantum() const
{
	// if we don't have that information, compute it
	attoseconds_t basetick = m_attoseconds_per_cycle;
	if (basetick == 0)
		basetick = HZ_TO_ATTOSECONDS(clocks_to_cycles(m_device.clock()));

	// apply the minimum cycle count
	return basetick * min_cycles();
}


//-------------------------------------------------
//  static_timed_trigger_callback - signal a timed
//  trigger
//-------------------------------------------------

TIMER_CALLBACK( device_execute_interface::static_timed_trigger_callback )
{
	device_execute_interface *device = reinterpret_cast<device_execute_interface *>(ptr);
	device->trigger(param);
}


//-------------------------------------------------
//  on_vblank - calls any external callbacks
//  for this screen
//-------------------------------------------------

void device_execute_interface::static_on_vblank(screen_device &screen, void *param, bool vblank_state)
{
	// VBLANK starting
	if (vblank_state)
	{
		device_execute_interface *exec = NULL;
		for (bool gotone = screen.machine->m_devicelist.first(exec); gotone; gotone = exec->next(exec))
			exec->on_vblank_start(screen);
	}
}

void device_execute_interface::on_vblank_start(screen_device &screen)
{
	// start the interrupt counter
	if (!suspended(SUSPEND_REASON_DISABLE))
		m_iloops = 0;
	else
		m_iloops = -1;

	// the hack style VBLANK decleration always uses the first screen
	bool interested = false;
	if (m_execute_config.m_vblank_interrupts_per_frame > 1)
		interested = true;

	// for new style declaration, we need to compare the tags
	else if (m_execute_config.m_vblank_interrupt_screen != NULL)
		interested = (strcmp(screen.tag(), m_execute_config.m_vblank_interrupt_screen) == 0);

	// if interested, call the interrupt handler
	if (interested)
	{
		if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE))
			(*m_execute_config.m_vblank_interrupt)(&m_device);

		// if we have more than one interrupt per frame, start the timer now to trigger the rest of them
		if (m_execute_config.m_vblank_interrupts_per_frame > 1 && !suspended(SUSPEND_REASON_DISABLE))
		{
			m_partial_frame_period = attotime_div(m_machine.primary_screen->frame_period(), m_execute_config.m_vblank_interrupts_per_frame);
			timer_adjust_oneshot(m_partial_frame_timer, m_partial_frame_period, 0);
		}
	}
}


//-------------------------------------------------
//  static_trigger_partial_frame_interrupt -
//  called to trigger a partial frame interrupt
//-------------------------------------------------

TIMER_CALLBACK( device_execute_interface::static_trigger_partial_frame_interrupt )
{
	reinterpret_cast<device_execute_interface *>(ptr)->trigger_partial_frame_interrupt();
}

void device_execute_interface::trigger_partial_frame_interrupt()
{
	// when we hit 0, reset to the total count
	if (m_iloops == 0)
		m_iloops = m_execute_config.m_vblank_interrupts_per_frame;

	// count one more "iloop"
	m_iloops--;

	// call the interrupt handler if we're not suspended
	if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE))
		(*m_execute_config.m_vblank_interrupt)(&m_device);

	// set up to retrigger if there's more interrupts to generate
	if (m_iloops > 1)
		timer_adjust_oneshot(m_partial_frame_timer, m_partial_frame_period, 0);
}


//-------------------------------------------------
//  static_trigger_periodic_interrupt - timer
//  callback for timed interrupts
//-------------------------------------------------

TIMER_CALLBACK( device_execute_interface::static_trigger_periodic_interrupt )
{
	reinterpret_cast<device_execute_interface *>(ptr)->trigger_periodic_interrupt();
}

void device_execute_interface::trigger_periodic_interrupt()
{
	// bail if there is no routine
	if (m_execute_config.m_timed_interrupt != NULL && !suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE))
		(*m_execute_config.m_timed_interrupt)(&m_device);
}


//-------------------------------------------------
//  static_standard_irq_callback - IRQ acknowledge
//  callback; handles HOLD_LINE case and signals
//  to the debugger
//-------------------------------------------------

IRQ_CALLBACK( device_execute_interface::static_standard_irq_callback )
{
	return device_execute(device)->standard_irq_callback(irqline);
}

int device_execute_interface::standard_irq_callback(int irqline)
{
	// get the default vector and acknowledge the interrupt if needed
	int vector = m_input[irqline].default_irq_callback();
	LOG(("static_standard_irq_callback('%s', %d) $%04x\n", m_device.tag(), irqline, vector));

	// if there's a driver callback, run it to get the vector
	if (m_driver_irq != NULL)
		vector = (*m_driver_irq)(&m_device, irqline);

	// notify the debugger
	debugger_interrupt_hook(&m_device, irqline);
	return vector;
}



//**************************************************************************
//  DEVICE INPUT
//**************************************************************************

//-------------------------------------------------
//  device_input - constructor
//-------------------------------------------------

device_execute_interface::device_input::device_input()
	: m_execute(NULL),
	  m_device(NULL),
	  m_linenum(0),
	  m_stored_vector(0),
	  m_curvector(0),
	  m_curstate(CLEAR_LINE),
	  m_qindex(0)
{
	memset(m_queue, 0, sizeof(m_queue));
}


//-------------------------------------------------
//  start - called by interface_pre_start so we
//  can set ourselves up
//-------------------------------------------------

void device_execute_interface::device_input::start(device_execute_interface *execute, int linenum)
{
	m_execute = execute;
	m_device = &m_execute->m_device;
	m_linenum = linenum;

	reset();

	state_save_register_device_item(m_device, m_linenum, m_stored_vector);
	state_save_register_device_item(m_device, m_linenum, m_curvector);
	state_save_register_device_item(m_device, m_linenum, m_curstate);
}


//-------------------------------------------------
//  reset - reset our input states
//-------------------------------------------------

void device_execute_interface::device_input::reset()
{
	m_curvector = m_stored_vector = m_execute->default_irq_vector();
	m_qindex = 0;
}


//-------------------------------------------------
//  set_state_synced - enqueue an event for later
//  execution via timer
//-------------------------------------------------

void device_execute_interface::device_input::set_state_synced(int state, int vector)
{
	LOG(("set_state_synced('%s',%d,%d,%02x)\n", m_device->tag(), m_linenum, state, vector));

if (TEMPLOG) printf("setline(%s,%d,%d,%d)\n", m_device->tag(), m_linenum, state, (vector == USE_STORED_VECTOR) ? 0 : vector);
	assert(state == ASSERT_LINE || state == HOLD_LINE || state == CLEAR_LINE || state == PULSE_LINE);

	// treat PULSE_LINE as ASSERT+CLEAR
	if (state == PULSE_LINE)
	{
		// catch errors where people use PULSE_LINE for devices that don't support it
		if (m_linenum != INPUT_LINE_NMI && m_linenum != INPUT_LINE_RESET)
			throw emu_fatalerror("device '%s': PULSE_LINE can only be used for NMI and RESET lines\n", m_device->tag());

		set_state_synced(ASSERT_LINE, vector);
		set_state_synced(CLEAR_LINE, vector);
		return;
	}

	// if we're full of events, flush the queue and log a message
	int event_index = m_qindex++;
	if (event_index >= ARRAY_LENGTH(m_queue))
	{
		m_qindex--;
		empty_event_queue();
		event_index = m_qindex++;
		logerror("Exceeded pending input line event queue on device '%s'!\n", m_device->tag());
	}

	// enqueue the event
	if (event_index < ARRAY_LENGTH(m_queue))
	{
		if (vector == USE_STORED_VECTOR)
			vector = m_stored_vector;
		m_queue[event_index] = (state & 0xff) | (vector << 8);

		// if this is the first one, set the timer
		if (event_index == 0)
			timer_call_after_resynch(&m_execute->m_machine, (void *)this, 0, static_empty_event_queue);
	}
}


//-------------------------------------------------
//  empty_event_queue - empty our event queue
//-------------------------------------------------

TIMER_CALLBACK( device_execute_interface::device_input::static_empty_event_queue )
{
	reinterpret_cast<device_input *>(ptr)->empty_event_queue();
}

void device_execute_interface::device_input::empty_event_queue()
{
if (TEMPLOG) printf("empty_queue(%s,%d,%d)\n", m_device->tag(), m_linenum, m_qindex);
	// loop over all events
	for (int curevent = 0; curevent < m_qindex; curevent++)
	{
		INT32 input_event = m_queue[curevent];

		// set the input line state and vector
		m_curstate = input_event & 0xff;
		m_curvector = input_event >> 8;
if (TEMPLOG) printf(" (%d,%d)\n", m_curstate, m_curvector);

		assert(m_curstate == ASSERT_LINE || m_curstate == HOLD_LINE || m_curstate == CLEAR_LINE);

		// special case: RESET
		if (m_linenum == INPUT_LINE_RESET)
		{
			// if we're asserting the line, just halt the device
			if (m_curstate == ASSERT_LINE)
				m_execute->suspend(SUSPEND_REASON_RESET, true);

			// if we're clearing the line that was previously asserted, reset the device
			else if (m_execute->suspended(SUSPEND_REASON_RESET))
			{
				m_device->reset();
				m_execute->resume(SUSPEND_REASON_RESET);
			}
		}

		// special case: HALT
		else if (m_linenum == INPUT_LINE_HALT)
		{
			// if asserting, halt the device
			if (m_curstate == ASSERT_LINE)
				m_execute->suspend(SUSPEND_REASON_HALT, true);

			// if clearing, unhalt the device
			else if (m_curstate == CLEAR_LINE)
				m_execute->resume(SUSPEND_REASON_HALT);
		}

		// all other cases
		else
		{
			// switch off the requested state
			switch (m_curstate)
			{
				case HOLD_LINE:
				case ASSERT_LINE:
					m_execute->execute_set_input(m_linenum, ASSERT_LINE);
					break;

				case CLEAR_LINE:
					m_execute->execute_set_input(m_linenum, CLEAR_LINE);
					break;

				default:
					logerror("empty_event_queue device '%s', line %d, unknown state %d\n", m_device->tag(), m_linenum, m_curstate);
					break;
			}

			// generate a trigger to unsuspend any devices waiting on the interrupt
			if (m_curstate != CLEAR_LINE)
				m_execute->signal_interrupt_trigger();
		}
	}

	// reset counter
	m_qindex = 0;
}


//-------------------------------------------------
//  default_irq_callback - the default IRQ
//  callback for this input line
//-------------------------------------------------

int device_execute_interface::device_input::default_irq_callback()
{
	int vector = m_curvector;

	// if the IRQ state is HOLD_LINE, clear it
	if (m_curstate == HOLD_LINE)
	{
		LOG(("->set_irq_line('%s',%d,%d)\n", m_device->tag(), m_linenum, CLEAR_LINE));
		m_execute->execute_set_input(m_linenum, CLEAR_LINE);
		m_curstate = CLEAR_LINE;
	}
	return vector;
}