mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
#include "940shared.h"
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static _940_data_t *shared_data = (_940_data_t *) 0x100000;
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static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x200000;
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YM2612 *ym2612_940;
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int *mix_buffer;
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// from init.s
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void wait_irq(void);
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void spend_cycles(int c);
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void cache_clean(void);
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void cache_clean_flush(void);
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// asm volatile ("mov r0, #0" ::: "r0");
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// asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
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// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
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void Main940(int startvector)
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{
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ym2612_940 = &shared_data->ym2612;
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mix_buffer = shared_data->mix_buffer;
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// debug
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shared_ctl->vstarts[startvector]++;
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asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
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for (;; shared_ctl->loopc++)
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{
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int job_num;
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/*
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while (!shared_ctl->busy)
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{
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//shared_ctl->waitc++;
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spend_cycles(256);
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}
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*/
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if (!shared_ctl->busy)
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{
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wait_irq();
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}
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for (job_num = 0; job_num < MAX_940JOBS; job_num++)
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{
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switch (shared_ctl->jobs[job_num])
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{
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case JOB940_YM2612INIT:
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shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
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YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
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break;
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case JOB940_YM2612RESETCHIP:
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YM2612ResetChip_();
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break;
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case JOB940_PICOSTATELOAD:
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YM2612PicoStateLoad_();
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break;
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case JOB940_YM2612UPDATEONE: {
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int i, dw, *wbuff;
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if (shared_ctl->writebuffsel == 1) {
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wbuff = (int *) shared_ctl->writebuff1;
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} else {
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wbuff = (int *) shared_ctl->writebuff0;
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}
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/* playback all writes */
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for (i = 2048/2; i > 0; i--) {
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UINT16 d;
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dw = *wbuff++;
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d = dw;
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if (d == 0xffff) break;
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YM2612Write_(d >> 8, d);
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d = (dw>>16);
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if (d == 0xffff) break;
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YM2612Write_(d >> 8, d);
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}
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YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);
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break;
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}
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}
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}
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shared_ctl->busy = 0;
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// cache_clean_flush();
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cache_clean();
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// asm volatile ("mov r0, #0" ::: "r0");
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// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
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}
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}
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