1 #include "940shared.h"
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3 static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
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4 static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
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5 static unsigned char *mp3_data = (unsigned char *) 0x01000000;
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10 void wait_irq(void);
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11 void spend_cycles(int c);
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12 void cache_clean(void);
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13 void cache_clean_flush(void);
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14 // this should help to resolve race confition where shared var
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15 // is changed by other core just before we update it
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16 void set_if_not_changed(int *val, int oldval, int newval);
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18 // asm volatile ("mov r0, #0" ::: "r0");
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19 // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
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20 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
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23 static void mp3_decode(void)
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25 int mp3_offs = shared_ctl->mp3_offs;
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26 unsigned char *readPtr = mp3_data + mp3_offs;
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27 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
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28 int offset; // frame offset from readPtr
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31 if (bytesLeft <= 0) return; // EOF, nothing to do
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33 offset = MP3FindSyncWord(readPtr, bytesLeft);
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35 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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39 bytesLeft -= offset;
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41 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
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42 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
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44 if (err == ERR_MP3_INDATA_UNDERFLOW) {
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45 shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF
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46 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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48 } else if (err <= -6 && err >= -12) {
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49 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
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50 // just try to skip the offending frame..
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53 shared_ctl->mp3_errors++;
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54 shared_ctl->mp3_lasterr = err;
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56 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
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60 void Main940(int startvector, int pc_at_irq)
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62 ym2612_940 = &shared_data->ym2612;
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63 mix_buffer = shared_data->mix_buffer;
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66 shared_ctl->vstarts[startvector]++;
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67 shared_ctl->last_irq_pc = pc_at_irq;
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68 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
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75 while (!shared_ctl->busy)
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77 //shared_ctl->waitc++;
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78 spend_cycles(8*1024);
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82 if (!shared_ctl->busy)
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86 shared_ctl->lastbusy = shared_ctl->busy;
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89 for (job_num = 0; job_num < MAX_940JOBS; job_num++)
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91 shared_ctl->lastjob = (job_num << 8) | shared_ctl->jobs[job_num];
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93 switch (shared_ctl->jobs[job_num])
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95 case JOB940_INITALL:
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97 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
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98 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
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99 /* Helix mp3 decoder */
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100 shared_data->mp3dec = MP3InitDecoder();
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103 case JOB940_YM2612RESETCHIP:
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104 YM2612ResetChip_();
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107 case JOB940_PICOSTATELOAD:
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108 YM2612PicoStateLoad_();
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111 case JOB940_YM2612UPDATEONE: {
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113 if (shared_ctl->writebuffsel == 1) {
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114 wbuff = (int *) shared_ctl->writebuff1;
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116 wbuff = (int *) shared_ctl->writebuff0;
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119 /* playback all writes */
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120 for (i = 2048/2; i > 0; i--) {
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124 if (d == 0xffff) break;
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125 YM2612Write_(d >> 8, d);
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127 if (d == 0xffff) break;
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128 YM2612Write_(d >> 8, d);
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131 YM2612UpdateOne_(mix_buffer, shared_ctl->length, shared_ctl->stereo, 1);
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135 case JOB940_MP3DECODE:
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142 // asm volatile ("mov r0, #0" ::: "r0");
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143 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
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144 // cache_clean_flush();
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146 shared_ctl->loopc++;
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148 // // shared_ctl->busy = 0; // shared mem is not reliable?
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