-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathmd.cpp
1239 lines (1114 loc) · 29.9 KB
/
md.cpp
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
// DGen/SDL v1.17+
// Megadrive C++ module
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#ifdef HAVE_MEMCPY_H
#include "memcpy.h"
#endif
#include "md.h"
#include "system.h"
#include "romload.h"
#include "rc-vars.h"
#include "debug.h"
#include "decode.h"
extern FILE *debug_log;
#ifdef WITH_STAR
extern "C" unsigned star_readbyte(unsigned a, unsigned d);
extern "C" unsigned star_readword(unsigned a, unsigned d);
extern "C" unsigned star_writebyte(unsigned a, unsigned d);
extern "C" unsigned star_writeword(unsigned a, unsigned d);
/**
* This sets up an array of memory locations.
* This method is StarScream specific.
* @return 0 on success
*/
int md::memory_map()
{
int i=0,j=0;
int rommax=romlen;
if (rommax>0xa00000) rommax=0xa00000;
if (rommax<0) rommax=0;
// FETCH: Set up 2 or 3 FETCH sections
i=0;
if (rommax>0)
{ fetch[i].lowaddr=0x000000; fetch[i].highaddr=rommax-1; fetch[i].offset=(unsigned)rom-0x000000; i++; }
fetch[i].lowaddr=0xff0000; fetch[i].highaddr=0xffffff; fetch[i].offset=(unsigned)ram- 0xff0000; i++;
// Testing
fetch[i].lowaddr=0xffff0000; fetch[i].highaddr=0xffffffff; fetch[i].offset=(unsigned)ram-0xffff0000; i++;
// Testing 2
fetch[i].lowaddr=0xff000000; fetch[i].highaddr=0xff000000+rommax-1; fetch[i].offset=(unsigned)rom-0xff000000; i++;
fetch[i].lowaddr=fetch[i].highaddr=0xffffffff; fetch[i].offset=0; i++;
if (debug_log!=NULL)
fprintf (debug_log,"StarScream memory_map has %d fetch sections\n",i);
i=0; j=0;
#if 0
// Simple version ***************
readbyte[i].lowaddr= readword[i].lowaddr=
writebyte[j].lowaddr= writeword[j].lowaddr= 0;
readbyte[i].highaddr= readword[i].highaddr=
writebyte[j].highaddr= writeword[j].highaddr= 0xffffffff;
readbyte[i].memorycall=(void *)star_readbyte;
readword[i].memorycall=(void *)star_readword;
writebyte[j].memorycall=(void *)star_writebyte;
writeword[j].memorycall=(void *)star_writeword;
readbyte[i].userdata= readword[i].userdata=
writebyte[j].userdata= writeword[j].userdata= NULL;
i++; j++;
// Simple version end ***************
#else
// Faster version ***************
// IO: Set up 3/4 read sections, and 2/3 write sections
if (rommax>0)
{
// Cartridge save RAM memory
if(save_len) {
readbyte[i].lowaddr= readword[i].lowaddr=
writebyte[j].lowaddr= writeword[j].lowaddr= save_start;
readbyte[i].highaddr= readword[i].highaddr=
writebyte[j].highaddr= writeword[j].highaddr= save_start+save_len-1;
readbyte[i].memorycall = star_readbyte;
readword[j].memorycall = star_readword;
writebyte[i].memorycall = star_writebyte;
writeword[j].memorycall = star_writeword;
readbyte[i].userdata= readword[i].userdata=
writebyte[j].userdata= writeword[j].userdata= NULL;
i++; j++;
}
// Cartridge ROM memory (read only)
readbyte[i].lowaddr= readword[i].lowaddr= 0x000000;
readbyte[i].highaddr= readword[i].highaddr= rommax-1;
readbyte[i].memorycall=readword[i].memorycall=NULL;
readbyte[i].userdata= readword[i].userdata= rom;
i++;
// misc memory (e.g. aoo and coo) through star_rw
readbyte[i].lowaddr= readword[i].lowaddr=
writebyte[j].lowaddr= writeword[j].lowaddr= rommax;
}
else
readbyte[i].lowaddr= readword[i].lowaddr=
writebyte[j].lowaddr= writeword[j].lowaddr= 0;
readbyte[i].highaddr= readword[i].highaddr=
writebyte[j].highaddr= writeword[j].highaddr= 0xfeffff;
readbyte[i].memorycall = star_readbyte;
readword[i].memorycall = star_readword;
writebyte[j].memorycall = star_writebyte;
writeword[j].memorycall = star_writeword;
readbyte[i].userdata= readword[i].userdata=
writebyte[j].userdata= writeword[j].userdata= NULL;
i++; j++;
// scratch RAM memory
readbyte[i].lowaddr = readword[i].lowaddr =
writebyte[j].lowaddr = writeword[j].lowaddr = 0xff0000;
readbyte[i].highaddr= readword[i].highaddr=
writebyte[j].highaddr= writeword[j].highaddr= 0xffffff;
readbyte[i].memorycall= readword[i].memorycall=
writebyte[j].memorycall=writeword[j].memorycall= NULL;
readbyte[i].userdata= readword[i].userdata =
writebyte[j].userdata= writeword[j].userdata = ram;
i++; j++;
// Faster version end ***************
#endif
// The end
readbyte[i].lowaddr = readword[i].lowaddr =
writebyte[j].lowaddr = writeword[j].lowaddr =
readbyte[i].highaddr = readword[i].highaddr =
writebyte[j].highaddr = writeword[j].highaddr = 0xffffffff;
readbyte[i].memorycall = 0;
readword[i].memorycall = 0;
writebyte[j].memorycall = 0;
writeword[j].memorycall = 0;
readbyte[i].userdata = 0;
readword[i].userdata = 0;
writebyte[j].userdata = 0;
writeword[j].userdata = 0;
i++; j++;
if (debug_log!=NULL)
fprintf (debug_log,"StarScream memory_map has %d read sections and %d write sections\n",i,j);
return 0;
}
void star_irq_callback(void)
{
assert(md::md_star != NULL);
md::md_star->m68k_vdp_irq_handler();
}
#endif
#ifdef WITH_MUSA
/**
* This sets up an array of memory locations for Musashi.
*/
void md::musa_memory_map()
{
unsigned int rom0_len = romlen;
unsigned int rom1_sta = 0;
unsigned int rom1_len = 0;
m68k_register_memory(NULL, 0);
if (save_len) {
DEBUG(("[%06x-%06x] ???? (SAVE)",
save_start, (save_start + save_len - 1)));
if (save_start < romlen) {
/* Punch a hole through the ROM area. */
rom0_len = save_start;
/* Add entry for ROM leftovers, if any. */
if ((save_start + save_len) < romlen) {
rom1_sta = (save_start + save_len);
rom1_len = (romlen - rom1_sta);
}
}
}
#ifdef ROM_BYTESWAP
#define S 1
#else
#define S 0
#endif
const m68k_mem_t mem[3] = {
// r, w, x, swab, addr, size, mask, mem
{ 1, 0, 1, S, 0x000000, rom0_len, 0x7fffff, rom }, // M68K ROM
{ 1, 1, 1, 1, 0xe00000, 0x200000, 0x00ffff, ram }, // M68K RAM
{ 1, 0, 1, S, rom1_sta, rom1_len, 0x7fffff, &rom[rom1_sta] }
};
unsigned int i;
unsigned int j = 0;
for (i = 0; ((i < elemof(mem)) && (j < elemof(musa_memory))); ++i) {
if (mem[i].size == 0)
continue;
DEBUG(("[%06x-%06x] %c%c%c%c (%s)",
mem[i].addr,
(mem[i].addr + mem[i].size - 1),
(mem[i].r ? 'r' : '-'),
(mem[i].w ? 'w' : '-'),
(mem[i].x ? 'x' : '-'),
(mem[i].swab ? 's' : '-'),
(mem[i].w ? "RAM" : "ROM")));
musa_memory[j] = mem[i];
++j;
}
if (j)
m68k_register_memory(musa_memory, j);
else
DEBUG(("no memory region defined"));
}
int musa_irq_callback(int level)
{
(void)level;
assert(md::md_musa != NULL);
md::md_musa->m68k_vdp_irq_handler();
return M68K_INT_ACK_AUTOVECTOR;
}
#endif
#ifdef WITH_CYCLONE
extern "C" uint32_t cyclone_read_memory_8(uint32_t address);
extern "C" uint32_t cyclone_read_memory_16(uint32_t address);
extern "C" uint32_t cyclone_read_memory_32(uint32_t address);
extern "C" void cyclone_write_memory_8(uint32_t address, uint8_t value);
extern "C" void cyclone_write_memory_16(uint32_t address, uint16_t value);
extern "C" void cyclone_write_memory_32(uint32_t address, uint32_t value);
extern "C" uintptr_t cyclone_checkpc(uintptr_t pc);
int cyclone_irq_callback(int level)
{
(void)level;
assert(md::md_cyclone != NULL);
md::md_cyclone->m68k_vdp_irq_handler();
return CYCLONE_INT_ACK_AUTOVECTOR;
}
#endif
/**
* Resets everything (Z80, M68K, VDP, etc).
* @return 0 on success
*/
int md::reset()
{
// Clear memory.
memset(mem, 0, 0x20000);
// Reset the VDP.
vdp.reset();
// Erase CPU states.
memset(&m68k_state, 0, sizeof(m68k_state));
memset(&z80_state, 0, sizeof(z80_state));
m68k_state_restore();
z80_state_restore();
#ifdef WITH_STAR
md_set_star(1);
s68000reset();
md_set_star(0);
#endif
#ifdef WITH_MUSA
md_set_musa(1);
m68k_pulse_reset();
md_set_musa(0);
#endif
#ifdef WITH_CYCLONE
md_set_cyclone(1);
CycloneReset(&cyclonecpu);
md_set_cyclone(0);
#endif
#ifdef WITH_DEBUGGER
debug_m68k_instr_count = 0;
debug_z80_instr_count = 0;
#endif
if (debug_log) fprintf (debug_log,"reset()\n");
aoo3_toggle=aoo5_toggle=aoo3_six=aoo5_six
=aoo3_six_timeout=aoo5_six_timeout
=coo4=coo5=0;
pad[0] = MD_PAD_UNTOUCHED;
pad[1] = MD_PAD_UNTOUCHED;
memset(pad_com, 0, sizeof(pad_com));
#ifdef WITH_PICO
// Initialize Pico pen X, Y coordinates
pico_pen_coords[0] = 0x3c;
pico_pen_coords[1] = 0x1fc;
#endif
// Reset FM registers
fm_reset();
dac_init();
memset(&odo, 0, sizeof(odo));
ras = 0;
z80_st_running = 0;
m68k_st_running = 0;
z80_reset();
z80_st_busreq = 1;
z80_st_reset = 1;
z80_st_irq = 0;
return 0;
}
#ifdef WITH_MZ80
extern "C" UINT8 mz80_read(UINT32 a, struct MemoryReadByte *unused);
extern "C" void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *unused);
extern "C" UINT16 mz80_ioread(UINT16 a, struct z80PortRead *unused);
extern "C" void mz80_iowrite(UINT16 a, UINT8 d, struct z80PortWrite *unused);
static struct MemoryReadByte mem_read[] = {
{ 0x0000, 0xffff, mz80_read, NULL },
{ (UINT32)-1, (UINT32)-1, NULL, NULL }
};
static struct MemoryWriteByte mem_write[] = {
{ 0x0000, 0xffff, mz80_write, NULL },
{ (UINT32)-1, (UINT32)-1, NULL, NULL }
};
static struct z80PortRead io_read[] = {
{ 0x00, 0xff, mz80_ioread, NULL },
{ (UINT16)-1, (UINT16)-1, NULL, NULL }
};
static struct z80PortWrite io_write[] = {
{ 0x00, 0xff, mz80_iowrite, NULL },
{ (UINT16)-1, (UINT16)-1, NULL, NULL }
};
#endif // WITH_MZ80
#ifdef WITH_CZ80
extern "C" uint8_t cz80_memread(void *ctx, uint16_t a);
extern "C" void cz80_memwrite(void *ctx, uint16_t a, uint8_t d);
extern "C" uint16_t cz80_memread16(void *ctx, uint16_t a);
extern "C" void cz80_memwrite16(void *ctx, uint16_t a, uint16_t d);
extern "C" uint8_t cz80_ioread(void *ctx, uint16_t a);
extern "C" void cz80_iowrite(void *ctx, uint16_t a, uint8_t d);
#endif // WITH_CZ80
#ifdef WITH_DRZ80
extern uintptr_t drz80_rebaseSP(uint16_t new_sp);
extern uintptr_t drz80_rebasePC(uint16_t new_pc);
extern uint8_t drz80_read8(uint16_t a);
extern uint16_t drz80_read16(uint16_t a);
extern void drz80_write8(uint8_t d, uint16_t a);
extern void drz80_write16(uint16_t d, uint16_t a);
extern uint8_t drz80_in(uint16_t p);
extern void drz80_out(uint16_t p, uint8_t d);
void drz80_irq_callback()
{
md::md_drz80->drz80_irq_cb();
}
void md::drz80_irq_cb()
{
drz80.Z80_IRQ = 0x00; // lower irq when in accepted
}
#endif // WITH_DRZ80
/**
* Initialise the Z80.
*/
void md::z80_init()
{
#ifdef WITH_MZ80
md_set_mz80(1);
mz80init();
mz80reset();
// Erase local context with global context.
mz80GetContext(&z80);
// Configure callbacks in local context.
z80.z80Base = z80ram;
z80.z80MemRead = mem_read;
z80.z80MemWrite = mem_write;
z80.z80IoRead = io_read;
z80.z80IoWrite = io_write;
// Erase global context with the above.
mz80SetContext(&z80);
md_set_mz80(0);
#endif
#ifdef WITH_CZ80
Cz80_Set_Ctx(&cz80, this);
Cz80_Set_Fetch(&cz80, 0x0000, 0xffff, (void *)z80ram);
Cz80_Set_ReadB(&cz80, cz80_memread);
Cz80_Set_WriteB(&cz80, cz80_memwrite);
Cz80_Set_ReadW(&cz80, cz80_memread16);
Cz80_Set_WriteW(&cz80, cz80_memwrite16);
Cz80_Set_INPort(&cz80, cz80_ioread);
Cz80_Set_OUTPort(&cz80, cz80_iowrite);
Cz80_Reset(&cz80);
#endif
#ifdef WITH_DRZ80
memset(&drz80, 0, sizeof(drz80));
drz80.z80_write8 = drz80_write8;
drz80.z80_write16 = drz80_write16;
drz80.z80_in = drz80_in;
drz80.z80_out = drz80_out;
drz80.z80_read8 = drz80_read8;
drz80.z80_read16 = drz80_read16;
drz80.z80_rebasePC = drz80_rebasePC;
drz80.z80_rebaseSP = drz80_rebaseSP;
drz80.z80_irq_callback = drz80_irq_callback;
#endif
z80_st_busreq = 1;
z80_st_reset = 0;
z80_bank68k = 0xff8000;
}
/**
* Reset the Z80.
*/
void md::z80_reset()
{
z80_bank68k = 0xff8000;
#ifdef WITH_MZ80
md_set_mz80(1);
mz80reset();
md_set_mz80(0);
#endif
#ifdef WITH_CZ80
Cz80_Reset(&cz80);
#endif
#ifdef WITH_DRZ80
md_set_drz80(1);
drz80.Z80A = (1 << 2); // set ZFlag
drz80.Z80F = (1 << 2); // set ZFlag
drz80.Z80BC = 0;
drz80.Z80DE = 0;
drz80.Z80HL = 0;
drz80.Z80A2 = 0;
drz80.Z80F2 = 0;
drz80.Z80BC2 = 0x0000 << 16;
drz80.Z80DE2 = 0x0000 << 16;
drz80.Z80HL2 = 0x0000 << 16;
drz80.Z80IX = 0xFFFF << 16;
drz80.Z80IY = 0xFFFF << 16;
drz80.Z80I = 0x00;
drz80.Z80_IRQ = 0x00;
drz80.Z80IF = 0x00;
drz80.Z80IM = 0x00;
drz80.Z80R = 0x00;
drz80.Z80PC = drz80_rebasePC(0);
drz80.Z80SP = drz80_rebaseSP(0x2000);
md_set_drz80(0);
#endif
}
/**
* Initialise sound.
* @return True when successful.
*/
bool md::init_sound()
{
if (lock == false)
return false;
if (ok_ym2612) {
YM2612Shutdown();
ok_ym2612 = false;
}
if (ok_sn76496) {
(void)0;
ok_sn76496 = false;
}
// Initialize two additional chips when MJazz is enabled.
if (YM2612Init((dgen_mjazz ? 3 : 1),
(((pal) ? PAL_MCLK : NTSC_MCLK) / 7),
dgen_soundrate, dgen_mjazz, NULL, NULL))
return false;
ok_ym2612 = true;
if (SN76496_init(0,
(((pal) ? PAL_MCLK : NTSC_MCLK) / 15),
dgen_soundrate, 16))
return false;
ok_sn76496 = true;
return true;
}
/**
* Switch to PAL or NTSC.
* This method's name is a bit misleading. This switches to PAL or not
* depending on "md::pal".
*/
void md::init_pal()
{
unsigned int hc;
if (pal) {
mclk = PAL_MCLK;
lines = PAL_LINES;
vhz = PAL_HZ;
}
else {
mclk = NTSC_MCLK;
lines = NTSC_LINES;
vhz = NTSC_HZ;
}
clk0 = (mclk / 15);
clk1 = (mclk / 7);
// Initialize horizontal counter table (Gens style)
for (hc = 0; (hc < 512); ++hc) {
// H32
hc_table[hc][0] = (((hc * 170) / M68K_CYCLES_PER_LINE) - 0x18);
// H40
hc_table[hc][1] = (((hc * 205) / M68K_CYCLES_PER_LINE) - 0x1c);
}
}
bool md::lock = false;
/**
* MD constructor.
* @param pal True if we are running the MD in PAL mode.
* @param region Region to emulate ('J', 'U', or 'E').
*/
md::md(bool pal, char region):
#ifdef WITH_MUSA
md_musa_ref(0), md_musa_prev(0),
#endif
#ifdef WITH_CYCLONE
md_cyclone_ref(0), md_cyclone_prev(0),
#endif
#ifdef WITH_STAR
md_star_ref(0), md_star_prev(0),
#endif
#ifdef WITH_CZ80
md_cz80_ref(0),
#endif
#ifdef WITH_MZ80
md_mz80_ref(0), md_mz80_prev(0),
#endif
pal(pal), ok_ym2612(false), ok_sn76496(false),
vdp(*this), region(region), plugged(false)
{
// Only one MD object is allowed to exist at once.
if (lock)
return;
lock = true;
// PAL or NTSC.
init_pal();
// Start up the sound chips.
if (init_sound() == false)
goto cleanup;
romlen = no_rom_size;
rom = (uint8_t*)no_rom;
mem=ram=z80ram=saveram=NULL;
save_start=save_len=save_prot=save_active=0;
fm_reset();
#ifdef WITH_VGMDUMP
vgm_dump_file = NULL;
vgm_dump_samples_total = 0;
vgm_dump_dac_wait = 0;
vgm_dump_dac_samples = 0;
vgm_dump = false;
#endif
#ifdef WITH_PICO
pico_enabled = false;
#endif
memset(&m68k_state, 0, sizeof(m68k_state));
memset(&z80_state, 0, sizeof(z80_state));
#ifdef WITH_MUSA
ctx_musa = calloc(1, m68k_context_size());
if (ctx_musa == NULL)
goto cleanup;
md_set_musa(1);
m68k_init();
m68k_set_cpu_type(M68K_CPU_TYPE_68000);
m68k_register_memory(NULL, 0);
m68k_set_int_ack_callback(musa_irq_callback);
md_set_musa(0);
#endif
#ifdef WITH_STAR
fetch=NULL;
readbyte=readword=writebyte=writeword=NULL;
memset(&cpu,0,sizeof(cpu));
#endif
#ifdef WITH_CYCLONE
memset(&cyclonecpu, 0, sizeof(cyclonecpu));
cyclonecpu.read8 = cyclone_read_memory_8;
cyclonecpu.read16 = cyclone_read_memory_16;
cyclonecpu.read32 = cyclone_read_memory_32;
cyclonecpu.write8 = cyclone_write_memory_8;
cyclonecpu.write16 = cyclone_write_memory_16;
cyclonecpu.write32 = cyclone_write_memory_32;
cyclonecpu.checkpc = cyclone_checkpc;
cyclonecpu.fetch8 = cyclone_read_memory_8;
cyclonecpu.fetch16 = cyclone_read_memory_16;
cyclonecpu.fetch32 = cyclone_read_memory_32;
cyclonecpu.IrqCallback = cyclone_irq_callback;
md_set_cyclone(1);
CycloneInit();
md_set_cyclone(0);
#endif
#ifdef WITH_MZ80
memset(&z80,0,sizeof(z80));
#endif
#ifdef WITH_CZ80
Cz80_Init(&cz80);
#endif
#ifdef WITH_DRZ80
memset(&drz80, 0, sizeof(drz80));
#endif
memset(&cart_head, 0, sizeof(cart_head));
memset(romname, 0, sizeof(romname));
ok=0;
// Format of pad is: __SA____ UDLRBC__
rom = (uint8_t*)no_rom;
romlen = no_rom_size;
mem=ram=z80ram=NULL;
mem=(unsigned char *)malloc(0x20008);
if (mem == NULL)
goto cleanup;
memset(mem,0,0x20000);
ram= mem+0x00000;
z80ram=mem+0x10000;
// Hack for DrZ80 to avoid crashing when PC leaves z80ram.
z80ram[0x10000] = 0x00; // NOP
z80ram[0x10001] = 0x00; // NOP
z80ram[0x10002] = 0x00; // NOP
z80ram[0x10003] = 0x00; // NOP
z80ram[0x10004] = 0x00; // NOP
z80ram[0x10005] = 0xc3; // JP 0x0000
z80ram[0x10006] = 0x00;
z80ram[0x10007] = 0x00;
#ifdef WITH_MUSA
md_set_musa(1);
musa_memory_map();
md_set_musa(0);
#endif
#ifdef WITH_STAR
md_set_star(1);
if (s68000init() != 0) {
md_set_star(0);
printf ("s68000init failed!\n");
goto cleanup;
}
md_set_star(0);
// Dave: Rich said doing point star stuff is done after s68000init
// in Asgard68000, so just in case...
if (((fetch = new STARSCREAM_PROGRAMREGION [6]) == NULL) ||
((readbyte = new STARSCREAM_DATAREGION [5]) == NULL) ||
((readword = new STARSCREAM_DATAREGION [5]) == NULL) ||
((writebyte = new STARSCREAM_DATAREGION [5]) == NULL) ||
((writeword = new STARSCREAM_DATAREGION [5]) == NULL))
goto cleanup;
memory_map();
// point star stuff
cpu.s_fetch = cpu.u_fetch = fetch;
cpu.s_readbyte = cpu.u_readbyte = readbyte;
cpu.s_readword = cpu.u_readword = readword;
cpu.s_writebyte = cpu.u_writebyte = writebyte;
cpu.s_writeword = cpu.u_writeword = writeword;
cpu.inthandler = star_irq_callback;
md_set_star(1);
s68000reset();
md_set_star(0);
#endif
// M68K: 0 = none, 1 = StarScream, 2 = Musashi, 3 = Cyclone
switch (dgen_emu_m68k) {
#ifdef WITH_STAR
case 1:
cpu_emu = CPU_EMU_STAR;
break;
#endif
#ifdef WITH_MUSA
case 2:
cpu_emu = CPU_EMU_MUSA;
break;
#endif
#ifdef WITH_CYCLONE
case 3:
cpu_emu = CPU_EMU_CYCLONE;
break;
#endif
default:
cpu_emu = CPU_EMU_NONE;
break;
}
// Z80: 0 = none, 1 = CZ80, 2 = MZ80, 3 = DrZ80
switch (dgen_emu_z80) {
#ifdef WITH_MZ80
case 1:
z80_core = Z80_CORE_MZ80;
break;
#endif
#ifdef WITH_CZ80
case 2:
z80_core = Z80_CORE_CZ80;
break;
#endif
#ifdef WITH_DRZ80
case 3:
z80_core = Z80_CORE_DRZ80;
break;
#endif
default:
z80_core = Z80_CORE_NONE;
break;
}
#ifdef WITH_MUSA
md_set_musa(1);
m68k_pulse_reset();
md_set_musa(0);
#endif
#ifdef WITH_DEBUGGER
debug_init();
#endif
z80_init();
reset(); // reset megadrive
patch_elem = NULL;
ok=1;
return;
cleanup:
if (ok_ym2612)
YM2612Shutdown();
if (ok_sn76496)
(void)0;
#ifdef WITH_MUSA
free(ctx_musa);
#endif
#ifdef WITH_STAR
delete [] fetch;
delete [] readbyte;
delete [] readword;
delete [] writebyte;
delete [] writeword;
#endif
free(mem);
memset(this, 0, sizeof(*this));
lock = false;
}
md::~md()
{
#ifdef WITH_VGMDUMP
vgm_dump_stop();
#endif
assert(rom != NULL);
if (rom != no_rom)
unplug();
free(mem);
rom=mem=ram=z80ram=NULL;
#ifdef WITH_DEBUGGER
debug_leave();
#endif
#ifdef WITH_MUSA
free(ctx_musa);
#endif
#ifdef WITH_STAR
delete [] fetch;
delete [] readbyte;
delete [] readword;
delete [] writebyte;
delete [] writeword;
#endif
if (ok_ym2612)
YM2612Shutdown();
if (ok_sn76496)
(void)0;
ok=0;
memset(this, 0, sizeof(*this));
lock = false;
}
#ifdef ROM_BYTESWAP
/**
* Byteswaps memory.
* @param[in] start Byte array of cart memory.
* @param len How many bytes to byteswap.
* @return 0 on success (always 0).
*/
// Byteswaps memory
int byteswap_memory(unsigned char *start,int len)
{ int i; unsigned char tmp;
for (i=0;i<len;i+=2)
{ tmp=start[i+0]; start[i+0]=start[i+1]; start[i+1]=tmp; }
return 0;
}
#endif
/**
* Plug a cart into the MD.
* @param[in] cart Cart's memory as a byte array.
* @param len Length of the cart.
* @return 0 on success.
*/
int md::plug_in(unsigned char *cart,int len)
{
// Plug in the cartridge specified by the uchar *
// NB - The megadrive will free() it if unplug() is called, or it exits
// So it must be a single piece of malloced data
if (cart==NULL) return 1; if (len<=0) return 1;
#ifdef ROM_BYTESWAP
byteswap_memory(cart,len); // for starscream
#endif
romlen=len;
rom=cart;
// Get saveram start, length (remember byteswapping)
// First check magic, if there is saveram
if(rom[ROM_ADDR(0x1b0)] == 'R' && rom[ROM_ADDR(0x1b1)] == 'A')
{
save_start = rom[ROM_ADDR(0x1b4)] << 24 | rom[ROM_ADDR(0x1b5)] << 16 |
rom[ROM_ADDR(0x1b6)] << 8 | rom[ROM_ADDR(0x1b7)];
save_len = rom[ROM_ADDR(0x1b8)] << 24 | rom[ROM_ADDR(0x1b9)] << 16 |
rom[ROM_ADDR(0x1ba)] << 8 | rom[ROM_ADDR(0x1bb)];
// Make sure start is even, end is odd, for alignment
// A ROM that I came across had the start and end bytes of
// the save ram the same and wouldn't work. Fix this as seen
// fit, I know it could probably use some work. [PKH]
if(save_start != save_len) {
if(save_start & 1) --save_start;
if(!(save_len & 1)) ++save_len;
save_len -= (save_start - 1);
saveram = (unsigned char*)calloc(1, save_len);
if (saveram == NULL) {
save_len = 0;
save_start = 0;
}
// If save RAM does not overlap main ROM, set it active by default since
// a few games can't manage to properly switch it on/off.
if(save_start >= (unsigned int)romlen)
save_active = 1;
}
else {
save_start = save_len = 0;
saveram = NULL;
}
}
else
{
save_start = save_len = 0;
saveram = NULL;
}
#ifdef WITH_MUSA
md_set_musa(1);
musa_memory_map();
md_set_musa(0);
#endif
#ifdef WITH_STAR
md_set_star(1);
memory_map(); // Update memory map to include this cartridge
md_set_star(0);
#endif
reset(); // Reset megadrive
return 0;
}
/**
* Region to emulate according to dgen_region_order and ROM header.
* @return Region identifier ('J', 'U' or 'E').
*/
uint8_t md::region_guess()
{
char const* order = dgen_region_order.val;
char const* avail = this->cart_head.countries;
size_t r;
size_t i;
assert(order != NULL);
assert(avail != NULL);
for (r = 0; (order[r] != '\0'); ++r)
for (i = 0; (i != sizeof(this->cart_head.countries)); ++i)
if ((isprint(order[r])) &&
(toupper(order[r]) == toupper(avail[i])))
return toupper(order[r]);
// Use default region.
return dgen_region;
}
/**
* Unplug a cart from the system.
* @return 0 on success.
*/
int md::unplug()
{
assert(rom != NULL);
assert(romlen != 0);
if (rom == no_rom) return 1;
unload_rom(rom);
rom = (uint8_t*)no_rom;
romlen = no_rom_size;
free(saveram);
saveram = NULL;
save_start = save_len = 0;
#ifdef WITH_MUSA
md_set_musa(1);
musa_memory_map();
md_set_musa(0);
#endif
#ifdef WITH_STAR
md_set_star(1);
memory_map(); // Update memory map to include no rom
md_set_star(0);
#endif
memset(romname, 0, sizeof(romname));
memset(&cart_head, 0, sizeof(cart_head));
reset();
while (patch_elem != NULL) {
struct patch_elem *next = patch_elem->next;
free(patch_elem);
patch_elem = next;
}
plugged = false;
return 0;
}
/**
* Load a ROM.
* @param[in] name File name of cart to load.
* @return 0 on success.
*/
int md::load(const char *name)
{
uint8_t *temp;
size_t size;
const char *b_name;
if ((name == NULL) ||
((b_name = dgen_basename(name)) == NULL))
return 1;
temp = load_rom(&size, name);
if (temp == NULL)
return 1;
// Register name
romname[0] = '\0';
if ((b_name[0] != '\0')) {
unsigned int i;
snprintf(romname, sizeof(romname), "%s", b_name);
for (i = 0; (romname[i] != '\0'); ++i)
if (romname[i] == '.') {
memset(&(romname[i]), 0,
(sizeof(romname) - i));
break;
}
}
if (romname[0] == '\0')
snprintf(romname, sizeof(romname), "%s", "unknown");
// Fill the header with ROM info (god this is ugly)
memcpy((void*)cart_head.system_name, (void*)(temp + 0x100), 0x10);
memcpy((void*)cart_head.copyright, (void*)(temp + 0x110), 0x10);
memcpy((void*)cart_head.domestic_name,(void*)(temp + 0x120), 0x30);
memcpy((void*)cart_head.overseas_name,(void*)(temp + 0x150), 0x30);
memcpy((void*)cart_head.product_no, (void*)(temp + 0x180), 0x0e);
cart_head.checksum = temp[0x18e]<<8 | temp[0x18f]; // ugly, but endian-neutral
memcpy((void*)cart_head.control_data, (void*)(temp + 0x190), 0x10);