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1 | // The top-level functions for the ARM940\r |
2 | // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r |
3 | \r |
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4 | #include "940shared.h"\r |
5 | \r |
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6 | static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r |
7 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r |
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8 | static unsigned char *mp3_data = (unsigned char *) 0x00400000;\r |
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9 | YM2612 *ym2612_940;\r |
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10 | \r |
11 | // from init.s\r |
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12 | int wait_get_job(int oldjob);\r |
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13 | void spend_cycles(int c);\r |
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14 | void dcache_clean(void);\r |
15 | void dcache_clean_flush(void);\r |
16 | void drain_wb(void);\r |
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17 | // this should help to resolve race confition where shared var\r |
18 | // is changed by other core just before we update it\r |
19 | void set_if_not_changed(int *val, int oldval, int newval);\r |
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20 | \r |
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21 | void _memcpy(void *dst, const void *src, int count);\r |
22 | \r |
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23 | // asm volatile ("mov r0, #0" ::: "r0");\r |
24 | // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r |
25 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r |
26 | \r |
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27 | \r |
28 | static void mp3_decode(void)\r |
29 | {\r |
30 | int mp3_offs = shared_ctl->mp3_offs;\r |
31 | unsigned char *readPtr = mp3_data + mp3_offs;\r |
32 | int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r |
33 | int offset; // frame offset from readPtr\r |
34 | int err;\r |
35 | \r |
36 | if (bytesLeft <= 0) return; // EOF, nothing to do\r |
37 | \r |
38 | offset = MP3FindSyncWord(readPtr, bytesLeft);\r |
39 | if (offset < 0) {\r |
40 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
41 | return; // EOF\r |
42 | }\r |
43 | readPtr += offset;\r |
44 | bytesLeft -= offset;\r |
45 | \r |
46 | err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r |
47 | shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r |
48 | if (err) {\r |
49 | if (err == ERR_MP3_INDATA_UNDERFLOW) {\r |
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50 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
51 | return;\r |
52 | } else if (err <= -6 && err >= -12) {\r |
53 | // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r |
54 | // just try to skip the offending frame..\r |
55 | readPtr++;\r |
56 | }\r |
57 | shared_ctl->mp3_errors++;\r |
58 | shared_ctl->mp3_lasterr = err;\r |
59 | }\r |
60 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r |
61 | }\r |
62 | \r |
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63 | static void ym_flush_writes(void)\r |
64 | {\r |
65 | UINT16 *wbuff;\r |
66 | int i;\r |
67 | \r |
68 | if (shared_ctl->writebuffsel == 1) {\r |
69 | wbuff = shared_ctl->writebuff1;\r |
70 | } else {\r |
71 | wbuff = shared_ctl->writebuff0;\r |
72 | }\r |
73 | \r |
74 | /* playback all writes */\r |
75 | for (i = 2048; i > 0; i--) {\r |
76 | UINT16 d = *wbuff++;\r |
77 | if (d == 0xffff) break;\r |
78 | if (d == 0xfffe) continue;\r |
79 | YM2612Write_(d >> 8, d);\r |
80 | }\r |
81 | }\r |
82 | \r |
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83 | static void ym_update(int *ym_buffer)\r |
84 | {\r |
85 | int i, dw;\r |
86 | int two_upds = 0;\r |
87 | UINT16 *wbuff;\r |
88 | \r |
89 | if (shared_ctl->writebuffsel == 1) {\r |
90 | wbuff = shared_ctl->writebuff1;\r |
91 | } else {\r |
92 | wbuff = shared_ctl->writebuff0;\r |
93 | }\r |
94 | \r |
95 | /* playback all writes */\r |
96 | for (i = 2048/2; i > 0; i--) {\r |
97 | UINT16 d;\r |
98 | dw = *(int *)wbuff;\r |
99 | d = dw;\r |
100 | wbuff++;\r |
101 | if (d == 0xffff) break;\r |
102 | if (d == 0xfffe) { two_upds=1; break; }\r |
103 | YM2612Write_(d >> 8, d);\r |
104 | d = (dw>>16);\r |
105 | wbuff++;\r |
106 | if (d == 0xffff) break;\r |
107 | if (d == 0xfffe) { two_upds=1; break; }\r |
108 | YM2612Write_(d >> 8, d);\r |
109 | }\r |
110 | \r |
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111 | if (two_upds)\r |
112 | {\r |
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113 | int len1 = shared_ctl->length / 2;\r |
114 | shared_ctl->ym_active_chs =\r |
115 | YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r |
116 | \r |
117 | for (i *= 2; i > 0; i--) {\r |
118 | UINT16 d = *wbuff++;\r |
119 | if (d == 0xffff) break;\r |
120 | YM2612Write_(d >> 8, d);\r |
121 | }\r |
122 | \r |
123 | ym_buffer += shared_ctl->stereo ? len1*2 : len1;\r |
124 | len1 = shared_ctl->length - len1;\r |
125 | \r |
126 | shared_ctl->ym_active_chs =\r |
127 | YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r |
128 | } else {\r |
129 | shared_ctl->ym_active_chs =\r |
130 | YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r |
131 | }\r |
132 | }\r |
133 | \r |
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134 | \r |
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135 | void Main940(void)\r |
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136 | {\r |
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137 | int *ym_buffer = shared_data->ym_buffer;\r |
138 | int job = 0;\r |
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139 | ym2612_940 = &shared_data->ym2612;\r |
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140 | \r |
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141 | \r |
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142 | for (;;)\r |
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143 | {\r |
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144 | job = wait_get_job(job);\r |
145 | \r |
146 | shared_ctl->lastjob = job;\r |
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147 | \r |
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148 | switch (job)\r |
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149 | {\r |
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150 | case JOB940_INITALL:\r |
151 | /* ym2612 */\r |
152 | shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r |
153 | YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r |
154 | /* Helix mp3 decoder */\r |
155 | shared_data->mp3dec = MP3InitDecoder();\r |
156 | break;\r |
157 | \r |
158 | case JOB940_INVALIDATE_DCACHE:\r |
159 | drain_wb();\r |
160 | dcache_clean_flush();\r |
161 | break;\r |
162 | \r |
163 | case JOB940_YM2612RESETCHIP:\r |
164 | YM2612ResetChip_();\r |
165 | break;\r |
166 | \r |
167 | case JOB940_PICOSTATELOAD:\r |
168 | YM2612PicoStateLoad_();\r |
169 | break;\r |
170 | \r |
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171 | case JOB940_PICOSTATESAVE2:\r |
172 | YM2612PicoStateSave2(0, 0);\r |
173 | _memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);\r |
174 | break;\r |
175 | \r |
176 | case JOB940_PICOSTATELOAD2_PREP:\r |
177 | ym_flush_writes();\r |
178 | break;\r |
179 | \r |
180 | case JOB940_PICOSTATELOAD2:\r |
181 | _memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);\r |
182 | YM2612PicoStateLoad2(0, 0);\r |
183 | break;\r |
184 | \r |
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185 | case JOB940_YM2612UPDATEONE:\r |
186 | ym_update(ym_buffer);\r |
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187 | break;\r |
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188 | \r |
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189 | case JOB940_MP3DECODE:\r |
190 | mp3_decode();\r |
191 | break;\r |
192 | }\r |
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193 | \r |
194 | shared_ctl->loopc++;\r |
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195 | dcache_clean();\r |
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196 | }\r |
197 | }\r |
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198 | \r |