1 // The top-level functions for the ARM940
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2 // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
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4 #include "940shared.h"
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6 static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
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7 static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
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8 static unsigned char *mp3_data = (unsigned char *) 0x00400000;
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12 int wait_get_job(int oldjob);
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13 void spend_cycles(int c);
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14 void dcache_clean(void);
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15 void dcache_clean_flush(void);
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16 void drain_wb(void);
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17 // this should help to resolve race confition where shared var
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18 // is changed by other core just before we update it
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19 void set_if_not_changed(int *val, int oldval, int newval);
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21 void _memcpy(void *dst, const void *src, int count);
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23 // asm volatile ("mov r0, #0" ::: "r0");
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24 // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
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25 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
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28 static void mp3_decode(void)
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30 int mp3_offs = shared_ctl->mp3_offs;
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31 unsigned char *readPtr = mp3_data + mp3_offs;
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32 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
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33 int offset; // frame offset from readPtr
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36 if (bytesLeft <= 0) return; // EOF, nothing to do
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38 offset = MP3FindSyncWord(readPtr, bytesLeft);
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40 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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44 bytesLeft -= offset;
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46 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
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47 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
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49 if (err == ERR_MP3_INDATA_UNDERFLOW) {
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50 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
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52 } else if (err <= -6 && err >= -12) {
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53 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
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54 // just try to skip the offending frame..
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57 shared_ctl->mp3_errors++;
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58 shared_ctl->mp3_lasterr = err;
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60 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
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63 static void ym_flush_writes(void)
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68 if (shared_ctl->writebuffsel == 1) {
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69 wbuff = shared_ctl->writebuff1;
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71 wbuff = shared_ctl->writebuff0;
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74 /* playback all writes */
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75 for (i = 2048; i > 0; i--) {
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76 UINT16 d = *wbuff++;
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77 if (d == 0xffff) break;
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78 if (d == 0xfffe) continue;
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79 YM2612Write_(d >> 8, d);
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83 static void ym_update(int *ym_buffer)
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89 if (shared_ctl->writebuffsel == 1) {
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90 wbuff = shared_ctl->writebuff1;
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92 wbuff = shared_ctl->writebuff0;
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95 /* playback all writes */
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96 for (i = 2048/2; i > 0; i--) {
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101 if (d == 0xffff) break;
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102 if (d == 0xfffe) { two_upds=1; break; }
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103 YM2612Write_(d >> 8, d);
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106 if (d == 0xffff) break;
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107 if (d == 0xfffe) { two_upds=1; break; }
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108 YM2612Write_(d >> 8, d);
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113 int len1 = shared_ctl->length / 2;
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114 shared_ctl->ym_active_chs =
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115 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
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117 for (i *= 2; i > 0; i--) {
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118 UINT16 d = *wbuff++;
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119 if (d == 0xffff) break;
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120 YM2612Write_(d >> 8, d);
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123 ym_buffer += shared_ctl->stereo ? len1*2 : len1;
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124 len1 = shared_ctl->length - len1;
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126 shared_ctl->ym_active_chs =
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127 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
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129 shared_ctl->ym_active_chs =
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130 YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);
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137 int *ym_buffer = shared_data->ym_buffer;
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139 ym2612_940 = &shared_data->ym2612;
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144 job = wait_get_job(job);
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146 shared_ctl->lastjob = job;
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150 case JOB940_INITALL:
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152 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
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153 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
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154 /* Helix mp3 decoder */
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155 shared_data->mp3dec = MP3InitDecoder();
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158 case JOB940_INVALIDATE_DCACHE:
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160 dcache_clean_flush();
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163 case JOB940_YM2612RESETCHIP:
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164 YM2612ResetChip_();
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167 case JOB940_PICOSTATELOAD:
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168 YM2612PicoStateLoad_();
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171 case JOB940_PICOSTATESAVE2:
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172 YM2612PicoStateSave2(0, 0);
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173 _memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);
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176 case JOB940_PICOSTATELOAD2_PREP:
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180 case JOB940_PICOSTATELOAD2:
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181 _memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);
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182 YM2612PicoStateLoad2(0, 0);
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185 case JOB940_YM2612UPDATEONE:
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186 ym_update(ym_buffer);
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189 case JOB940_MP3DECODE:
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194 shared_ctl->loopc++;
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