[PATCH] ppc32: add sound support for Mac Mini
[linux-2.6.git] / sound / isa / sb / sb8_main.c
1 /*
2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3  *                   Uros Bizjak <uros@kss-loka.si>
4  *
5  *  Routines for control of 8-bit SoundBlaster cards and clones
6  *  Please note: I don't have access to old SB8 soundcards.
7  *
8  *
9  *   This program is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU General Public License as published by
11  *   the Free Software Foundation; either version 2 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This program is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *   GNU General Public License for more details.
18  *
19  *   You should have received a copy of the GNU General Public License
20  *   along with this program; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22  *
23  * --
24  *
25  * Thu Apr 29 20:36:17 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
26  *   DSP can't respond to commands whilst in "high speed" mode. Caused 
27  *   glitching during playback. Fixed.
28  *
29  * Wed Jul 12 22:02:55 CEST 2000 Uros Bizjak <uros@kss-loka.si>
30  *   Cleaned up and rewrote lowlevel routines.
31  */
32
33 #include <sound/driver.h>
34 #include <asm/io.h>
35 #include <asm/dma.h>
36 #include <linux/init.h>
37 #include <linux/time.h>
38 #include <sound/core.h>
39 #include <sound/sb.h>
40
41 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Uros Bizjak <uros@kss-loka.si>");
42 MODULE_DESCRIPTION("Routines for control of 8-bit SoundBlaster cards and clones");
43 MODULE_LICENSE("GPL");
44
45 #define SB8_CLOCK       1000000
46 #define SB8_DEN(v)      ((SB8_CLOCK + (v) / 2) / (v))
47 #define SB8_RATE(v)     (SB8_CLOCK / SB8_DEN(v))
48
49 static ratnum_t clock = {
50         .num = SB8_CLOCK,
51         .den_min = 1,
52         .den_max = 256,
53         .den_step = 1,
54 };
55
56 static snd_pcm_hw_constraint_ratnums_t hw_constraints_clock = {
57         .nrats = 1,
58         .rats = &clock,
59 };
60
61 static ratnum_t stereo_clocks[] = {
62         {
63                 .num = SB8_CLOCK,
64                 .den_min = SB8_DEN(22050),
65                 .den_max = SB8_DEN(22050),
66                 .den_step = 1,
67         },
68         {
69                 .num = SB8_CLOCK,
70                 .den_min = SB8_DEN(11025),
71                 .den_max = SB8_DEN(11025),
72                 .den_step = 1,
73         }
74 };
75
76 static int snd_sb8_hw_constraint_rate_channels(snd_pcm_hw_params_t *params,
77                                                snd_pcm_hw_rule_t *rule)
78 {
79         snd_interval_t *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
80         if (c->min > 1) {
81                 unsigned int num = 0, den = 0;
82                 int err = snd_interval_ratnum(hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE),
83                                           2, stereo_clocks, &num, &den);
84                 if (err >= 0 && den) {
85                         params->rate_num = num;
86                         params->rate_den = den;
87                 }
88                 return err;
89         }
90         return 0;
91 }
92
93 static int snd_sb8_hw_constraint_channels_rate(snd_pcm_hw_params_t *params,
94                                                snd_pcm_hw_rule_t *rule)
95 {
96         snd_interval_t *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
97         if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
98                 snd_interval_t t = { .min = 1, .max = 1 };
99                 return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
100         }
101         return 0;
102 }
103
104 static int snd_sb8_playback_prepare(snd_pcm_substream_t * substream)
105 {
106         unsigned long flags;
107         sb_t *chip = snd_pcm_substream_chip(substream);
108         snd_pcm_runtime_t *runtime = substream->runtime;
109         unsigned int mixreg, rate, size, count;
110
111         rate = runtime->rate;
112         switch (chip->hardware) {
113         case SB_HW_PRO:
114                 if (runtime->channels > 1) {
115                         snd_assert(rate == SB8_RATE(11025) || rate == SB8_RATE(22050), return -EINVAL);
116                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
117                         break;
118                 }
119                 /* fallthru */
120         case SB_HW_201:
121                 if (rate > 23000) {
122                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
123                         break;
124                 }
125                 /* fallthru */
126         case SB_HW_20:
127                 chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
128                 break;
129         case SB_HW_10:
130                 chip->playback_format = SB_DSP_OUTPUT;
131                 break;
132         default:
133                 return -EINVAL;
134         }
135         size = chip->p_dma_size = snd_pcm_lib_buffer_bytes(substream);
136         count = chip->p_period_size = snd_pcm_lib_period_bytes(substream);
137         spin_lock_irqsave(&chip->reg_lock, flags);
138         snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON);
139         if (runtime->channels > 1) {
140                 /* set playback stereo mode */
141                 spin_lock(&chip->mixer_lock);
142                 mixreg = snd_sbmixer_read(chip, SB_DSP_STEREO_SW);
143                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, mixreg | 0x02);
144                 spin_unlock(&chip->mixer_lock);
145
146                 /* Soundblaster hardware programming reference guide, 3-23 */
147                 snd_sbdsp_command(chip, SB_DSP_DMA8_EXIT);
148                 runtime->dma_area[0] = 0x80;
149                 snd_dma_program(chip->dma8, runtime->dma_addr, 1, DMA_MODE_WRITE);
150                 /* force interrupt */
151                 chip->mode = SB_MODE_HALT;
152                 snd_sbdsp_command(chip, SB_DSP_OUTPUT);
153                 snd_sbdsp_command(chip, 0);
154                 snd_sbdsp_command(chip, 0);
155         }
156         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
157         if (runtime->channels > 1) {
158                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
159                 spin_lock(&chip->mixer_lock);
160                 /* save output filter status and turn it off */
161                 mixreg = snd_sbmixer_read(chip, SB_DSP_PLAYBACK_FILT);
162                 snd_sbmixer_write(chip, SB_DSP_PLAYBACK_FILT, mixreg | 0x20);
163                 spin_unlock(&chip->mixer_lock);
164                 /* just use force_mode16 for temporary storate... */
165                 chip->force_mode16 = mixreg;
166         } else {
167                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
168         }
169         if (chip->playback_format != SB_DSP_OUTPUT) {
170                 count--;
171                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
172                 snd_sbdsp_command(chip, count & 0xff);
173                 snd_sbdsp_command(chip, count >> 8);
174         }
175         spin_unlock_irqrestore(&chip->reg_lock, flags);
176         snd_dma_program(chip->dma8, runtime->dma_addr,
177                         size, DMA_MODE_WRITE | DMA_AUTOINIT);
178         return 0;
179 }
180
181 static int snd_sb8_playback_trigger(snd_pcm_substream_t * substream,
182                                     int cmd)
183 {
184         unsigned long flags;
185         sb_t *chip = snd_pcm_substream_chip(substream);
186         unsigned int count;
187
188         spin_lock_irqsave(&chip->reg_lock, flags);
189         switch (cmd) {
190         case SNDRV_PCM_TRIGGER_START:
191                 snd_sbdsp_command(chip, chip->playback_format);
192                 if (chip->playback_format == SB_DSP_OUTPUT) {
193                         count = chip->p_period_size - 1;
194                         snd_sbdsp_command(chip, count & 0xff);
195                         snd_sbdsp_command(chip, count >> 8);
196                 }
197                 break;
198         case SNDRV_PCM_TRIGGER_STOP:
199                 if (chip->playback_format == SB_DSP_HI_OUTPUT_AUTO) {
200                         snd_pcm_runtime_t *runtime = substream->runtime;
201                         snd_sbdsp_reset(chip);
202                         if (runtime->channels > 1) {
203                                 spin_lock(&chip->mixer_lock);
204                                 /* restore output filter and set hardware to mono mode */ 
205                                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, chip->force_mode16 & ~0x02);
206                                 spin_unlock(&chip->mixer_lock);
207                         }
208                 } else {
209                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
210                 }
211                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
212         }
213         spin_unlock_irqrestore(&chip->reg_lock, flags);
214         chip->mode = (cmd == SNDRV_PCM_TRIGGER_START) ? SB_MODE_PLAYBACK_8 : SB_MODE_HALT;
215         return 0;
216 }
217
218 static int snd_sb8_hw_params(snd_pcm_substream_t * substream,
219                              snd_pcm_hw_params_t * hw_params)
220 {
221         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
222 }
223
224 static int snd_sb8_hw_free(snd_pcm_substream_t * substream)
225 {
226         snd_pcm_lib_free_pages(substream);
227         return 0;
228 }
229
230 static int snd_sb8_capture_prepare(snd_pcm_substream_t * substream)
231 {
232         unsigned long flags;
233         sb_t *chip = snd_pcm_substream_chip(substream);
234         snd_pcm_runtime_t *runtime = substream->runtime;
235         unsigned int mixreg, rate, size, count;
236
237         rate = runtime->rate;
238         switch (chip->hardware) {
239         case SB_HW_PRO:
240                 if (runtime->channels > 1) {
241                         snd_assert(rate == SB8_RATE(11025) || rate == SB8_RATE(22050), return -EINVAL);
242                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
243                         break;
244                 }
245                 chip->capture_format = (rate > 23000) ? SB_DSP_HI_INPUT_AUTO : SB_DSP_LO_INPUT_AUTO;
246                 break;
247         case SB_HW_201:
248                 if (rate > 13000) {
249                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
250                         break;
251                 }
252                 /* fallthru */
253         case SB_HW_20:
254                 chip->capture_format = SB_DSP_LO_INPUT_AUTO;
255                 break;
256         case SB_HW_10:
257                 chip->capture_format = SB_DSP_INPUT;
258                 break;
259         default:
260                 return -EINVAL;
261         }
262         size = chip->c_dma_size = snd_pcm_lib_buffer_bytes(substream);
263         count = chip->c_period_size = snd_pcm_lib_period_bytes(substream);
264         spin_lock_irqsave(&chip->reg_lock, flags);
265         snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
266         if (runtime->channels > 1)
267                 snd_sbdsp_command(chip, SB_DSP_STEREO_8BIT);
268         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
269         if (runtime->channels > 1) {
270                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
271                 spin_lock(&chip->mixer_lock);
272                 /* save input filter status and turn it off */
273                 mixreg = snd_sbmixer_read(chip, SB_DSP_CAPTURE_FILT);
274                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, mixreg | 0x20);
275                 spin_unlock(&chip->mixer_lock);
276                 /* just use force_mode16 for temporary storate... */
277                 chip->force_mode16 = mixreg;
278         } else {
279                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
280         }
281         if (chip->capture_format != SB_DSP_OUTPUT) {
282                 count--;
283                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
284                 snd_sbdsp_command(chip, count & 0xff);
285                 snd_sbdsp_command(chip, count >> 8);
286         }
287         spin_unlock_irqrestore(&chip->reg_lock, flags);
288         snd_dma_program(chip->dma8, runtime->dma_addr,
289                         size, DMA_MODE_READ | DMA_AUTOINIT);
290         return 0;
291 }
292
293 static int snd_sb8_capture_trigger(snd_pcm_substream_t * substream,
294                                    int cmd)
295 {
296         unsigned long flags;
297         sb_t *chip = snd_pcm_substream_chip(substream);
298         unsigned int count;
299
300         spin_lock_irqsave(&chip->reg_lock, flags);
301         switch (cmd) {
302         case SNDRV_PCM_TRIGGER_START:
303                 snd_sbdsp_command(chip, chip->capture_format);
304                 if (chip->capture_format == SB_DSP_INPUT) {
305                         count = chip->c_period_size - 1;
306                         snd_sbdsp_command(chip, count & 0xff);
307                         snd_sbdsp_command(chip, count >> 8);
308                 }
309                 break;
310         case SNDRV_PCM_TRIGGER_STOP:
311                 if (chip->capture_format == SB_DSP_HI_INPUT_AUTO) {
312                         snd_pcm_runtime_t *runtime = substream->runtime;
313                         snd_sbdsp_reset(chip);
314                         if (runtime->channels > 1) {
315                                 /* restore input filter status */
316                                 spin_lock(&chip->mixer_lock);
317                                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, chip->force_mode16);
318                                 spin_unlock(&chip->mixer_lock);
319                                 /* set hardware to mono mode */
320                                 snd_sbdsp_command(chip, SB_DSP_MONO_8BIT);
321                         }
322                 } else {
323                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
324                 }
325                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
326         }
327         spin_unlock_irqrestore(&chip->reg_lock, flags);
328         chip->mode = (cmd == SNDRV_PCM_TRIGGER_START) ? SB_MODE_CAPTURE_8 : SB_MODE_HALT;
329         return 0;
330 }
331
332 irqreturn_t snd_sb8dsp_interrupt(sb_t *chip)
333 {
334         snd_pcm_substream_t *substream;
335         snd_pcm_runtime_t *runtime;
336
337 #if 0
338         snd_printk("sb8: interrupt\n");
339 #endif
340         snd_sb_ack_8bit(chip);
341         switch (chip->mode) {
342         case SB_MODE_PLAYBACK_8:        /* ok.. playback is active */
343                 substream = chip->playback_substream;
344                 runtime = substream->runtime;
345                 if (chip->playback_format == SB_DSP_OUTPUT)
346                         snd_sb8_playback_trigger(substream, SNDRV_PCM_TRIGGER_START);
347                 snd_pcm_period_elapsed(substream);
348                 break;
349         case SB_MODE_CAPTURE_8:
350                 substream = chip->capture_substream;
351                 runtime = substream->runtime;
352                 if (chip->capture_format == SB_DSP_INPUT)
353                         snd_sb8_capture_trigger(substream, SNDRV_PCM_TRIGGER_START);
354                 snd_pcm_period_elapsed(substream);
355                 break;
356         }
357         return IRQ_HANDLED;
358 }
359
360 static snd_pcm_uframes_t snd_sb8_playback_pointer(snd_pcm_substream_t * substream)
361 {
362         sb_t *chip = snd_pcm_substream_chip(substream);
363         size_t ptr;
364
365         if (chip->mode != SB_MODE_PLAYBACK_8)
366                 return 0;
367         ptr = snd_dma_pointer(chip->dma8, chip->p_dma_size);
368         return bytes_to_frames(substream->runtime, ptr);
369 }
370
371 static snd_pcm_uframes_t snd_sb8_capture_pointer(snd_pcm_substream_t * substream)
372 {
373         sb_t *chip = snd_pcm_substream_chip(substream);
374         size_t ptr;
375
376         if (chip->mode != SB_MODE_CAPTURE_8)
377                 return 0;
378         ptr = snd_dma_pointer(chip->dma8, chip->c_dma_size);
379         return bytes_to_frames(substream->runtime, ptr);
380 }
381
382 /*
383
384  */
385
386 static snd_pcm_hardware_t snd_sb8_playback =
387 {
388         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
389                                  SNDRV_PCM_INFO_MMAP_VALID),
390         .formats =               SNDRV_PCM_FMTBIT_U8,
391         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
392                                  SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_22050),
393         .rate_min =             4000,
394         .rate_max =             23000,
395         .channels_min =         1,
396         .channels_max =         1,
397         .buffer_bytes_max =     65536,
398         .period_bytes_min =     64,
399         .period_bytes_max =     65536,
400         .periods_min =          1,
401         .periods_max =          1024,
402         .fifo_size =            0,
403 };
404
405 static snd_pcm_hardware_t snd_sb8_capture =
406 {
407         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
408                                  SNDRV_PCM_INFO_MMAP_VALID),
409         .formats =              SNDRV_PCM_FMTBIT_U8,
410         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
411                                  SNDRV_PCM_RATE_11025),
412         .rate_min =             4000,
413         .rate_max =             13000,
414         .channels_min =         1,
415         .channels_max =         1,
416         .buffer_bytes_max =     65536,
417         .period_bytes_min =     64,
418         .period_bytes_max =     65536,
419         .periods_min =          1,
420         .periods_max =          1024,
421         .fifo_size =            0,
422 };
423
424 /*
425  *
426  */
427  
428 static int snd_sb8_open(snd_pcm_substream_t *substream)
429 {
430         sb_t *chip = snd_pcm_substream_chip(substream);
431         snd_pcm_runtime_t *runtime = substream->runtime;
432         unsigned long flags;
433
434         spin_lock_irqsave(&chip->open_lock, flags);
435         if (chip->open) {
436                 spin_unlock_irqrestore(&chip->open_lock, flags);
437                 return -EAGAIN;
438         }
439         chip->open |= SB_OPEN_PCM;
440         spin_unlock_irqrestore(&chip->open_lock, flags);
441         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
442                 chip->playback_substream = substream;
443                 runtime->hw = snd_sb8_playback;
444         } else {
445                 chip->capture_substream = substream;
446                 runtime->hw = snd_sb8_capture;
447         }
448         switch (chip->hardware) {
449         case SB_HW_PRO:
450                 runtime->hw.rate_max = 44100;
451                 runtime->hw.channels_max = 2;
452                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
453                                     snd_sb8_hw_constraint_rate_channels, NULL,
454                                     SNDRV_PCM_HW_PARAM_CHANNELS,
455                                     SNDRV_PCM_HW_PARAM_RATE, -1);
456                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
457                                      snd_sb8_hw_constraint_channels_rate, NULL,
458                                      SNDRV_PCM_HW_PARAM_RATE, -1);
459                 break;
460         case SB_HW_201:
461                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
462                         runtime->hw.rate_max = 44100;
463                 } else {
464                         runtime->hw.rate_max = 15000;
465                 }
466         default:
467                 break;
468         }
469         snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
470                                       &hw_constraints_clock);
471         return 0;       
472 }
473
474 static int snd_sb8_close(snd_pcm_substream_t *substream)
475 {
476         unsigned long flags;
477         sb_t *chip = snd_pcm_substream_chip(substream);
478
479         chip->playback_substream = NULL;
480         chip->capture_substream = NULL;
481         spin_lock_irqsave(&chip->open_lock, flags);
482         chip->open &= ~SB_OPEN_PCM;
483         spin_unlock_irqrestore(&chip->open_lock, flags);
484         return 0;
485 }
486
487 /*
488  *  Initialization part
489  */
490  
491 static snd_pcm_ops_t snd_sb8_playback_ops = {
492         .open =                 snd_sb8_open,
493         .close =                snd_sb8_close,
494         .ioctl =                snd_pcm_lib_ioctl,
495         .hw_params =            snd_sb8_hw_params,
496         .hw_free =              snd_sb8_hw_free,
497         .prepare =              snd_sb8_playback_prepare,
498         .trigger =              snd_sb8_playback_trigger,
499         .pointer =              snd_sb8_playback_pointer,
500 };
501
502 static snd_pcm_ops_t snd_sb8_capture_ops = {
503         .open =                 snd_sb8_open,
504         .close =                snd_sb8_close,
505         .ioctl =                snd_pcm_lib_ioctl,
506         .hw_params =            snd_sb8_hw_params,
507         .hw_free =              snd_sb8_hw_free,
508         .prepare =              snd_sb8_capture_prepare,
509         .trigger =              snd_sb8_capture_trigger,
510         .pointer =              snd_sb8_capture_pointer,
511 };
512
513 static void snd_sb8dsp_pcm_free(snd_pcm_t *pcm)
514 {
515         snd_pcm_lib_preallocate_free_for_all(pcm);
516 }
517
518 int snd_sb8dsp_pcm(sb_t *chip, int device, snd_pcm_t ** rpcm)
519 {
520         snd_card_t *card = chip->card;
521         snd_pcm_t *pcm;
522         int err;
523
524         if (rpcm)
525                 *rpcm = NULL;
526         if ((err = snd_pcm_new(card, "SB8 DSP", device, 1, 1, &pcm)) < 0)
527                 return err;
528         sprintf(pcm->name, "DSP v%i.%i", chip->version >> 8, chip->version & 0xff);
529         pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
530         pcm->private_data = chip;
531         pcm->private_free = snd_sb8dsp_pcm_free;
532
533         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sb8_playback_ops);
534         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_sb8_capture_ops);
535
536         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
537                                               snd_dma_isa_data(),
538                                               64*1024, 64*1024);
539
540         if (rpcm)
541                 *rpcm = pcm;
542         return 0;
543 }
544
545 EXPORT_SYMBOL(snd_sb8dsp_pcm);
546 EXPORT_SYMBOL(snd_sb8dsp_interrupt);
547   /* sb8_midi.c */
548 EXPORT_SYMBOL(snd_sb8dsp_midi_interrupt);
549 EXPORT_SYMBOL(snd_sb8dsp_midi);
550
551 /*
552  *  INIT part
553  */
554
555 static int __init alsa_sb8_init(void)
556 {
557         return 0;
558 }
559
560 static void __exit alsa_sb8_exit(void)
561 {
562 }
563
564 module_init(alsa_sb8_init)
565 module_exit(alsa_sb8_exit)