/
sb16.c
1420 lines (1192 loc) · 35 KB
/
sb16.c
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
/*
* QEMU Soundblaster 16 emulation
*
* Copyright (c) 2003-2005 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "hw.h"
#include "audiodev.h"
#include "audio/audio.h"
#include "isa.h"
#include "qdev.h"
#include "qemu-timer.h"
#include "host-utils.h"
#define dolog(...) AUD_log ("sb16", __VA_ARGS__)
/* #define DEBUG */
/* #define DEBUG_SB16_MOST */
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
#define IO_READ_PROTO(name) \
uint32_t name (void *opaque, uint32_t nport)
#define IO_WRITE_PROTO(name) \
void name (void *opaque, uint32_t nport, uint32_t val)
static const char e3[] = "COPYRIGHT (C) CREATIVE TECHNOLOGY LTD, 1992.";
typedef struct SB16State {
ISADevice dev;
QEMUSoundCard card;
qemu_irq pic;
uint32_t irq;
uint32_t dma;
uint32_t hdma;
uint32_t port;
uint32_t ver;
int in_index;
int out_data_len;
int fmt_stereo;
int fmt_signed;
int fmt_bits;
audfmt_e fmt;
int dma_auto;
int block_size;
int fifo;
int freq;
int time_const;
int speaker;
int needed_bytes;
int cmd;
int use_hdma;
int highspeed;
int can_write;
int v2x6;
uint8_t csp_param;
uint8_t csp_value;
uint8_t csp_mode;
uint8_t csp_regs[256];
uint8_t csp_index;
uint8_t csp_reg83[4];
int csp_reg83r;
int csp_reg83w;
uint8_t in2_data[10];
uint8_t out_data[50];
uint8_t test_reg;
uint8_t last_read_byte;
int nzero;
int left_till_irq;
int dma_running;
int bytes_per_second;
int align;
int audio_free;
SWVoiceOut *voice;
QEMUTimer *aux_ts;
/* mixer state */
int mixer_nreg;
uint8_t mixer_regs[256];
} SB16State;
static void SB_audio_callback (void *opaque, int free);
static int magic_of_irq (int irq)
{
switch (irq) {
case 5:
return 2;
case 7:
return 4;
case 9:
return 1;
case 10:
return 8;
default:
dolog ("bad irq %d\n", irq);
return 2;
}
}
static int irq_of_magic (int magic)
{
switch (magic) {
case 1:
return 9;
case 2:
return 5;
case 4:
return 7;
case 8:
return 10;
default:
dolog ("bad irq magic %d\n", magic);
return -1;
}
}
#if 0
static void log_dsp (SB16State *dsp)
{
ldebug ("%s:%s:%d:%s:dmasize=%d:freq=%d:const=%d:speaker=%d\n",
dsp->fmt_stereo ? "Stereo" : "Mono",
dsp->fmt_signed ? "Signed" : "Unsigned",
dsp->fmt_bits,
dsp->dma_auto ? "Auto" : "Single",
dsp->block_size,
dsp->freq,
dsp->time_const,
dsp->speaker);
}
#endif
static void speaker (SB16State *s, int on)
{
s->speaker = on;
/* AUD_enable (s->voice, on); */
}
static void control (SB16State *s, int hold)
{
int dma = s->use_hdma ? s->hdma : s->dma;
s->dma_running = hold;
ldebug ("hold %d high %d dma %d\n", hold, s->use_hdma, dma);
if (hold) {
DMA_hold_DREQ (dma);
AUD_set_active_out (s->voice, 1);
}
else {
DMA_release_DREQ (dma);
AUD_set_active_out (s->voice, 0);
}
}
static void aux_timer (void *opaque)
{
SB16State *s = opaque;
s->can_write = 1;
qemu_irq_raise (s->pic);
}
#define DMA8_AUTO 1
#define DMA8_HIGH 2
static void continue_dma8 (SB16State *s)
{
if (s->freq > 0) {
struct audsettings as;
s->audio_free = 0;
as.freq = s->freq;
as.nchannels = 1 << s->fmt_stereo;
as.fmt = s->fmt;
as.endianness = 0;
s->voice = AUD_open_out (
&s->card,
s->voice,
"sb16",
s,
SB_audio_callback,
&as
);
}
control (s, 1);
}
static void dma_cmd8 (SB16State *s, int mask, int dma_len)
{
s->fmt = AUD_FMT_U8;
s->use_hdma = 0;
s->fmt_bits = 8;
s->fmt_signed = 0;
s->fmt_stereo = (s->mixer_regs[0x0e] & 2) != 0;
if (-1 == s->time_const) {
if (s->freq <= 0)
s->freq = 11025;
}
else {
int tmp = (256 - s->time_const);
s->freq = (1000000 + (tmp / 2)) / tmp;
}
if (dma_len != -1) {
s->block_size = dma_len << s->fmt_stereo;
}
else {
/* This is apparently the only way to make both Act1/PL
and SecondReality/FC work
Act1 sets block size via command 0x48 and it's an odd number
SR does the same with even number
Both use stereo, and Creatives own documentation states that
0x48 sets block size in bytes less one.. go figure */
s->block_size &= ~s->fmt_stereo;
}
s->freq >>= s->fmt_stereo;
s->left_till_irq = s->block_size;
s->bytes_per_second = (s->freq << s->fmt_stereo);
/* s->highspeed = (mask & DMA8_HIGH) != 0; */
s->dma_auto = (mask & DMA8_AUTO) != 0;
s->align = (1 << s->fmt_stereo) - 1;
if (s->block_size & s->align) {
dolog ("warning: misaligned block size %d, alignment %d\n",
s->block_size, s->align + 1);
}
ldebug ("freq %d, stereo %d, sign %d, bits %d, "
"dma %d, auto %d, fifo %d, high %d\n",
s->freq, s->fmt_stereo, s->fmt_signed, s->fmt_bits,
s->block_size, s->dma_auto, s->fifo, s->highspeed);
continue_dma8 (s);
speaker (s, 1);
}
static void dma_cmd (SB16State *s, uint8_t cmd, uint8_t d0, int dma_len)
{
s->use_hdma = cmd < 0xc0;
s->fifo = (cmd >> 1) & 1;
s->dma_auto = (cmd >> 2) & 1;
s->fmt_signed = (d0 >> 4) & 1;
s->fmt_stereo = (d0 >> 5) & 1;
switch (cmd >> 4) {
case 11:
s->fmt_bits = 16;
break;
case 12:
s->fmt_bits = 8;
break;
}
if (-1 != s->time_const) {
#if 1
int tmp = 256 - s->time_const;
s->freq = (1000000 + (tmp / 2)) / tmp;
#else
/* s->freq = 1000000 / ((255 - s->time_const) << s->fmt_stereo); */
s->freq = 1000000 / ((255 - s->time_const));
#endif
s->time_const = -1;
}
s->block_size = dma_len + 1;
s->block_size <<= (s->fmt_bits == 16);
if (!s->dma_auto) {
/* It is clear that for DOOM and auto-init this value
shouldn't take stereo into account, while Miles Sound Systems
setsound.exe with single transfer mode wouldn't work without it
wonders of SB16 yet again */
s->block_size <<= s->fmt_stereo;
}
ldebug ("freq %d, stereo %d, sign %d, bits %d, "
"dma %d, auto %d, fifo %d, high %d\n",
s->freq, s->fmt_stereo, s->fmt_signed, s->fmt_bits,
s->block_size, s->dma_auto, s->fifo, s->highspeed);
if (16 == s->fmt_bits) {
if (s->fmt_signed) {
s->fmt = AUD_FMT_S16;
}
else {
s->fmt = AUD_FMT_U16;
}
}
else {
if (s->fmt_signed) {
s->fmt = AUD_FMT_S8;
}
else {
s->fmt = AUD_FMT_U8;
}
}
s->left_till_irq = s->block_size;
s->bytes_per_second = (s->freq << s->fmt_stereo) << (s->fmt_bits == 16);
s->highspeed = 0;
s->align = (1 << (s->fmt_stereo + (s->fmt_bits == 16))) - 1;
if (s->block_size & s->align) {
dolog ("warning: misaligned block size %d, alignment %d\n",
s->block_size, s->align + 1);
}
if (s->freq) {
struct audsettings as;
s->audio_free = 0;
as.freq = s->freq;
as.nchannels = 1 << s->fmt_stereo;
as.fmt = s->fmt;
as.endianness = 0;
s->voice = AUD_open_out (
&s->card,
s->voice,
"sb16",
s,
SB_audio_callback,
&as
);
}
control (s, 1);
speaker (s, 1);
}
static inline void dsp_out_data (SB16State *s, uint8_t val)
{
ldebug ("outdata %#x\n", val);
if ((size_t) s->out_data_len < sizeof (s->out_data)) {
s->out_data[s->out_data_len++] = val;
}
}
static inline uint8_t dsp_get_data (SB16State *s)
{
if (s->in_index) {
return s->in2_data[--s->in_index];
}
else {
dolog ("buffer underflow\n");
return 0;
}
}
static void command (SB16State *s, uint8_t cmd)
{
ldebug ("command %#x\n", cmd);
if (cmd > 0xaf && cmd < 0xd0) {
if (cmd & 8) {
dolog ("ADC not yet supported (command %#x)\n", cmd);
}
switch (cmd >> 4) {
case 11:
case 12:
break;
default:
dolog ("%#x wrong bits\n", cmd);
}
s->needed_bytes = 3;
}
else {
s->needed_bytes = 0;
switch (cmd) {
case 0x03:
dsp_out_data (s, 0x10); /* s->csp_param); */
goto warn;
case 0x04:
s->needed_bytes = 1;
goto warn;
case 0x05:
s->needed_bytes = 2;
goto warn;
case 0x08:
/* __asm__ ("int3"); */
goto warn;
case 0x0e:
s->needed_bytes = 2;
goto warn;
case 0x09:
dsp_out_data (s, 0xf8);
goto warn;
case 0x0f:
s->needed_bytes = 1;
goto warn;
case 0x10:
s->needed_bytes = 1;
goto warn;
case 0x14:
s->needed_bytes = 2;
s->block_size = 0;
break;
case 0x1c: /* Auto-Initialize DMA DAC, 8-bit */
dma_cmd8 (s, DMA8_AUTO, -1);
break;
case 0x20: /* Direct ADC, Juice/PL */
dsp_out_data (s, 0xff);
goto warn;
case 0x35:
dolog ("0x35 - MIDI command not implemented\n");
break;
case 0x40:
s->freq = -1;
s->time_const = -1;
s->needed_bytes = 1;
break;
case 0x41:
s->freq = -1;
s->time_const = -1;
s->needed_bytes = 2;
break;
case 0x42:
s->freq = -1;
s->time_const = -1;
s->needed_bytes = 2;
goto warn;
case 0x45:
dsp_out_data (s, 0xaa);
goto warn;
case 0x47: /* Continue Auto-Initialize DMA 16bit */
break;
case 0x48:
s->needed_bytes = 2;
break;
case 0x74:
s->needed_bytes = 2; /* DMA DAC, 4-bit ADPCM */
dolog ("0x75 - DMA DAC, 4-bit ADPCM not implemented\n");
break;
case 0x75: /* DMA DAC, 4-bit ADPCM Reference */
s->needed_bytes = 2;
dolog ("0x74 - DMA DAC, 4-bit ADPCM Reference not implemented\n");
break;
case 0x76: /* DMA DAC, 2.6-bit ADPCM */
s->needed_bytes = 2;
dolog ("0x74 - DMA DAC, 2.6-bit ADPCM not implemented\n");
break;
case 0x77: /* DMA DAC, 2.6-bit ADPCM Reference */
s->needed_bytes = 2;
dolog ("0x74 - DMA DAC, 2.6-bit ADPCM Reference not implemented\n");
break;
case 0x7d:
dolog ("0x7d - Autio-Initialize DMA DAC, 4-bit ADPCM Reference\n");
dolog ("not implemented\n");
break;
case 0x7f:
dolog (
"0x7d - Autio-Initialize DMA DAC, 2.6-bit ADPCM Reference\n"
);
dolog ("not implemented\n");
break;
case 0x80:
s->needed_bytes = 2;
break;
case 0x90:
case 0x91:
dma_cmd8 (s, ((cmd & 1) == 0) | DMA8_HIGH, -1);
break;
case 0xd0: /* halt DMA operation. 8bit */
control (s, 0);
break;
case 0xd1: /* speaker on */
speaker (s, 1);
break;
case 0xd3: /* speaker off */
speaker (s, 0);
break;
case 0xd4: /* continue DMA operation. 8bit */
/* KQ6 (or maybe Sierras audblst.drv in general) resets
the frequency between halt/continue */
continue_dma8 (s);
break;
case 0xd5: /* halt DMA operation. 16bit */
control (s, 0);
break;
case 0xd6: /* continue DMA operation. 16bit */
control (s, 1);
break;
case 0xd9: /* exit auto-init DMA after this block. 16bit */
s->dma_auto = 0;
break;
case 0xda: /* exit auto-init DMA after this block. 8bit */
s->dma_auto = 0;
break;
case 0xe0: /* DSP identification */
s->needed_bytes = 1;
break;
case 0xe1:
dsp_out_data (s, s->ver & 0xff);
dsp_out_data (s, s->ver >> 8);
break;
case 0xe2:
s->needed_bytes = 1;
goto warn;
case 0xe3:
{
int i;
for (i = sizeof (e3) - 1; i >= 0; --i)
dsp_out_data (s, e3[i]);
}
break;
case 0xe4: /* write test reg */
s->needed_bytes = 1;
break;
case 0xe7:
dolog ("Attempt to probe for ESS (0xe7)?\n");
break;
case 0xe8: /* read test reg */
dsp_out_data (s, s->test_reg);
break;
case 0xf2:
case 0xf3:
dsp_out_data (s, 0xaa);
s->mixer_regs[0x82] |= (cmd == 0xf2) ? 1 : 2;
qemu_irq_raise (s->pic);
break;
case 0xf9:
s->needed_bytes = 1;
goto warn;
case 0xfa:
dsp_out_data (s, 0);
goto warn;
case 0xfc: /* FIXME */
dsp_out_data (s, 0);
goto warn;
default:
dolog ("Unrecognized command %#x\n", cmd);
break;
}
}
if (!s->needed_bytes) {
ldebug ("\n");
}
exit:
if (!s->needed_bytes) {
s->cmd = -1;
}
else {
s->cmd = cmd;
}
return;
warn:
dolog ("warning: command %#x,%d is not truly understood yet\n",
cmd, s->needed_bytes);
goto exit;
}
static uint16_t dsp_get_lohi (SB16State *s)
{
uint8_t hi = dsp_get_data (s);
uint8_t lo = dsp_get_data (s);
return (hi << 8) | lo;
}
static uint16_t dsp_get_hilo (SB16State *s)
{
uint8_t lo = dsp_get_data (s);
uint8_t hi = dsp_get_data (s);
return (hi << 8) | lo;
}
static void complete (SB16State *s)
{
int d0, d1, d2;
ldebug ("complete command %#x, in_index %d, needed_bytes %d\n",
s->cmd, s->in_index, s->needed_bytes);
if (s->cmd > 0xaf && s->cmd < 0xd0) {
d2 = dsp_get_data (s);
d1 = dsp_get_data (s);
d0 = dsp_get_data (s);
if (s->cmd & 8) {
dolog ("ADC params cmd = %#x d0 = %d, d1 = %d, d2 = %d\n",
s->cmd, d0, d1, d2);
}
else {
ldebug ("cmd = %#x d0 = %d, d1 = %d, d2 = %d\n",
s->cmd, d0, d1, d2);
dma_cmd (s, s->cmd, d0, d1 + (d2 << 8));
}
}
else {
switch (s->cmd) {
case 0x04:
s->csp_mode = dsp_get_data (s);
s->csp_reg83r = 0;
s->csp_reg83w = 0;
ldebug ("CSP command 0x04: mode=%#x\n", s->csp_mode);
break;
case 0x05:
s->csp_param = dsp_get_data (s);
s->csp_value = dsp_get_data (s);
ldebug ("CSP command 0x05: param=%#x value=%#x\n",
s->csp_param,
s->csp_value);
break;
case 0x0e:
d0 = dsp_get_data (s);
d1 = dsp_get_data (s);
ldebug ("write CSP register %d <- %#x\n", d1, d0);
if (d1 == 0x83) {
ldebug ("0x83[%d] <- %#x\n", s->csp_reg83r, d0);
s->csp_reg83[s->csp_reg83r % 4] = d0;
s->csp_reg83r += 1;
}
else {
s->csp_regs[d1] = d0;
}
break;
case 0x0f:
d0 = dsp_get_data (s);
ldebug ("read CSP register %#x -> %#x, mode=%#x\n",
d0, s->csp_regs[d0], s->csp_mode);
if (d0 == 0x83) {
ldebug ("0x83[%d] -> %#x\n",
s->csp_reg83w,
s->csp_reg83[s->csp_reg83w % 4]);
dsp_out_data (s, s->csp_reg83[s->csp_reg83w % 4]);
s->csp_reg83w += 1;
}
else {
dsp_out_data (s, s->csp_regs[d0]);
}
break;
case 0x10:
d0 = dsp_get_data (s);
dolog ("cmd 0x10 d0=%#x\n", d0);
break;
case 0x14:
dma_cmd8 (s, 0, dsp_get_lohi (s) + 1);
break;
case 0x40:
s->time_const = dsp_get_data (s);
ldebug ("set time const %d\n", s->time_const);
break;
case 0x42: /* FT2 sets output freq with this, go figure */
#if 0
dolog ("cmd 0x42 might not do what it think it should\n");
#endif
case 0x41:
s->freq = dsp_get_hilo (s);
ldebug ("set freq %d\n", s->freq);
break;
case 0x48:
s->block_size = dsp_get_lohi (s) + 1;
ldebug ("set dma block len %d\n", s->block_size);
break;
case 0x74:
case 0x75:
case 0x76:
case 0x77:
/* ADPCM stuff, ignore */
break;
case 0x80:
{
int freq, samples, bytes;
int64_t ticks;
freq = s->freq > 0 ? s->freq : 11025;
samples = dsp_get_lohi (s) + 1;
bytes = samples << s->fmt_stereo << (s->fmt_bits == 16);
ticks = muldiv64 (bytes, get_ticks_per_sec (), freq);
if (ticks < get_ticks_per_sec () / 1024) {
qemu_irq_raise (s->pic);
}
else {
if (s->aux_ts) {
qemu_mod_timer (
s->aux_ts,
qemu_get_clock (vm_clock) + ticks
);
}
}
ldebug ("mix silence %d %d %" PRId64 "\n", samples, bytes, ticks);
}
break;
case 0xe0:
d0 = dsp_get_data (s);
s->out_data_len = 0;
ldebug ("E0 data = %#x\n", d0);
dsp_out_data (s, ~d0);
break;
case 0xe2:
#ifdef DEBUG
d0 = dsp_get_data (s);
dolog ("E2 = %#x\n", d0);
#endif
break;
case 0xe4:
s->test_reg = dsp_get_data (s);
break;
case 0xf9:
d0 = dsp_get_data (s);
ldebug ("command 0xf9 with %#x\n", d0);
switch (d0) {
case 0x0e:
dsp_out_data (s, 0xff);
break;
case 0x0f:
dsp_out_data (s, 0x07);
break;
case 0x37:
dsp_out_data (s, 0x38);
break;
default:
dsp_out_data (s, 0x00);
break;
}
break;
default:
dolog ("complete: unrecognized command %#x\n", s->cmd);
return;
}
}
ldebug ("\n");
s->cmd = -1;
return;
}
static void legacy_reset (SB16State *s)
{
struct audsettings as;
s->freq = 11025;
s->fmt_signed = 0;
s->fmt_bits = 8;
s->fmt_stereo = 0;
as.freq = s->freq;
as.nchannels = 1;
as.fmt = AUD_FMT_U8;
as.endianness = 0;
s->voice = AUD_open_out (
&s->card,
s->voice,
"sb16",
s,
SB_audio_callback,
&as
);
/* Not sure about that... */
/* AUD_set_active_out (s->voice, 1); */
}
static void reset (SB16State *s)
{
qemu_irq_lower (s->pic);
if (s->dma_auto) {
qemu_irq_raise (s->pic);
qemu_irq_lower (s->pic);
}
s->mixer_regs[0x82] = 0;
s->dma_auto = 0;
s->in_index = 0;
s->out_data_len = 0;
s->left_till_irq = 0;
s->needed_bytes = 0;
s->block_size = -1;
s->nzero = 0;
s->highspeed = 0;
s->v2x6 = 0;
s->cmd = -1;
dsp_out_data (s, 0xaa);
speaker (s, 0);
control (s, 0);
legacy_reset (s);
}
static IO_WRITE_PROTO (dsp_write)
{
SB16State *s = opaque;
int iport;
iport = nport - s->port;
ldebug ("write %#x <- %#x\n", nport, val);
switch (iport) {
case 0x06:
switch (val) {
case 0x00:
if (s->v2x6 == 1) {
reset (s);
}
s->v2x6 = 0;
break;
case 0x01:
case 0x03: /* FreeBSD kludge */
s->v2x6 = 1;
break;
case 0xc6:
s->v2x6 = 0; /* Prince of Persia, csp.sys, diagnose.exe */
break;
case 0xb8: /* Panic */
reset (s);
break;
case 0x39:
dsp_out_data (s, 0x38);
reset (s);
s->v2x6 = 0x39;
break;
default:
s->v2x6 = val;
break;
}
break;
case 0x0c: /* write data or command | write status */
/* if (s->highspeed) */
/* break; */
if (0 == s->needed_bytes) {
command (s, val);
#if 0
if (0 == s->needed_bytes) {
log_dsp (s);
}
#endif
}
else {
if (s->in_index == sizeof (s->in2_data)) {
dolog ("in data overrun\n");
}
else {
s->in2_data[s->in_index++] = val;
if (s->in_index == s->needed_bytes) {
s->needed_bytes = 0;
complete (s);
#if 0
log_dsp (s);
#endif
}
}
}
break;
default:
ldebug ("(nport=%#x, val=%#x)\n", nport, val);
break;
}
}
static IO_READ_PROTO (dsp_read)
{
SB16State *s = opaque;
int iport, retval, ack = 0;
iport = nport - s->port;
switch (iport) {
case 0x06: /* reset */
retval = 0xff;
break;
case 0x0a: /* read data */
if (s->out_data_len) {
retval = s->out_data[--s->out_data_len];
s->last_read_byte = retval;
}
else {
if (s->cmd != -1) {
dolog ("empty output buffer for command %#x\n",
s->cmd);
}
retval = s->last_read_byte;
/* goto error; */
}
break;
case 0x0c: /* 0 can write */
retval = s->can_write ? 0 : 0x80;
break;
case 0x0d: /* timer interrupt clear */
/* dolog ("timer interrupt clear\n"); */
retval = 0;
break;
case 0x0e: /* data available status | irq 8 ack */
retval = (!s->out_data_len || s->highspeed) ? 0 : 0x80;
if (s->mixer_regs[0x82] & 1) {
ack = 1;
s->mixer_regs[0x82] &= 1;
qemu_irq_lower (s->pic);