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1 | #include "940shared.h"\r |
2 | \r |
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3 | static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r |
4 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r |
5 | static unsigned char *mp3_data = (unsigned char *) 0x01000000;\r |
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6 | YM2612 *ym2612_940;\r |
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7 | \r |
8 | // from init.s\r |
9 | void wait_irq(void);\r |
10 | void spend_cycles(int c);\r |
11 | void cache_clean(void);\r |
12 | void cache_clean_flush(void);\r |
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13 | // this should help to resolve race confition where shared var\r |
14 | // is changed by other core just before we update it\r |
15 | void set_if_not_changed(int *val, int oldval, int newval);\r |
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16 | \r |
17 | // asm volatile ("mov r0, #0" ::: "r0");\r |
18 | // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r |
19 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r |
20 | \r |
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21 | \r |
22 | static void mp3_decode(void)\r |
23 | {\r |
24 | int mp3_offs = shared_ctl->mp3_offs;\r |
25 | unsigned char *readPtr = mp3_data + mp3_offs;\r |
26 | int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r |
27 | int offset; // frame offset from readPtr\r |
28 | int err;\r |
29 | \r |
30 | if (bytesLeft <= 0) return; // EOF, nothing to do\r |
31 | \r |
32 | offset = MP3FindSyncWord(readPtr, bytesLeft);\r |
33 | if (offset < 0) {\r |
34 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
35 | return; // EOF\r |
36 | }\r |
37 | readPtr += offset;\r |
38 | bytesLeft -= offset;\r |
39 | \r |
40 | err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r |
41 | shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r |
42 | if (err) {\r |
43 | if (err == ERR_MP3_INDATA_UNDERFLOW) {\r |
44 | shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF\r |
45 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
46 | return;\r |
47 | } else if (err <= -6 && err >= -12) {\r |
48 | // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r |
49 | // just try to skip the offending frame..\r |
50 | readPtr++;\r |
51 | }\r |
52 | shared_ctl->mp3_errors++;\r |
53 | shared_ctl->mp3_lasterr = err;\r |
54 | }\r |
55 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r |
56 | }\r |
57 | \r |
58 | \r |
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59 | void Main940(int startvector, int pc_at_irq)\r |
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60 | {\r |
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61 | int mix_buffer = shared_data->mix_buffer;\r |
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62 | ym2612_940 = &shared_data->ym2612;\r |
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63 | \r |
64 | // debug\r |
65 | shared_ctl->vstarts[startvector]++;\r |
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66 | shared_ctl->last_irq_pc = pc_at_irq;\r |
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67 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r |
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68 | \r |
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69 | \r |
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70 | // for (;;)\r |
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71 | {\r |
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72 | int job_num = 0;\r |
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73 | /*\r |
74 | while (!shared_ctl->busy)\r |
75 | {\r |
76 | //shared_ctl->waitc++;\r |
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77 | spend_cycles(8*1024);\r |
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78 | }\r |
79 | */\r |
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80 | /*\r |
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81 | if (!shared_ctl->busy)\r |
82 | {\r |
83 | wait_irq();\r |
84 | }\r |
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85 | shared_ctl->lastbusy = shared_ctl->busy;\r |
86 | */\r |
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87 | \r |
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88 | for (job_num = 0; job_num < MAX_940JOBS; job_num++)\r |
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89 | {\r |
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90 | shared_ctl->lastjob = (job_num << 8) | shared_ctl->jobs[job_num];\r |
91 | \r |
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92 | switch (shared_ctl->jobs[job_num])\r |
93 | {\r |
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94 | case JOB940_INITALL:\r |
95 | /* ym2612 */\r |
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96 | shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r |
97 | YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r |
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98 | /* Helix mp3 decoder */\r |
99 | shared_data->mp3dec = MP3InitDecoder();\r |
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100 | break;\r |
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101 | \r |
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102 | case JOB940_YM2612RESETCHIP:\r |
103 | YM2612ResetChip_();\r |
104 | break;\r |
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105 | \r |
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106 | case JOB940_PICOSTATELOAD:\r |
107 | YM2612PicoStateLoad_();\r |
108 | break;\r |
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109 | \r |
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110 | case JOB940_YM2612UPDATEONE: {\r |
111 | int i, dw, *wbuff;\r |
112 | if (shared_ctl->writebuffsel == 1) {\r |
113 | wbuff = (int *) shared_ctl->writebuff1;\r |
114 | } else {\r |
115 | wbuff = (int *) shared_ctl->writebuff0;\r |
116 | }\r |
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117 | \r |
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118 | /* playback all writes */\r |
119 | for (i = 2048/2; i > 0; i--) {\r |
120 | UINT16 d;\r |
121 | dw = *wbuff++;\r |
122 | d = dw;\r |
123 | if (d == 0xffff) break;\r |
124 | YM2612Write_(d >> 8, d);\r |
125 | d = (dw>>16);\r |
126 | if (d == 0xffff) break;\r |
127 | YM2612Write_(d >> 8, d);\r |
128 | }\r |
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129 | \r |
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130 | YM2612UpdateOne_(mix_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r |
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131 | break;\r |
132 | }\r |
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133 | \r |
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134 | case JOB940_MP3DECODE:\r |
135 | mp3_decode();\r |
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136 | break;\r |
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137 | }\r |
138 | }\r |
139 | \r |
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140 | cache_clean();\r |
141 | // asm volatile ("mov r0, #0" ::: "r0");\r |
142 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r |
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143 | // cache_clean_flush();\r |
144 | \r |
145 | shared_ctl->loopc++;\r |
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146 | \r |
147 | // // shared_ctl->busy = 0; // shared mem is not reliable?\r |
148 | \r |
149 | wait_irq();\r |
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150 | }\r |
151 | }\r |
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152 | \r |