1 // The top-level functions for the ARM940
2 // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
3
4 #include "940shared.h"
5 #include "../../common/helix/pub/mp3dec.h"
6
7 static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
8 static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
9 static unsigned char *mp3_data = (unsigned char *) 0x00400000;
10 YM2612 *ym2612_940;
11
12 // from init.s
13 int wait_get_job(int oldjob);
14 void spend_cycles(int c);
15 void dcache_clean(void);
16 void dcache_clean_flush(void);
17 void drain_wb(void);
18 // this should help to resolve race confition where shared var
19 // is changed by other core just before we update it
20 void set_if_not_changed(int *val, int oldval, int newval);
21
22 extern void *memcpy(void *dest, const void *src, unsigned long n);
23
24 // asm volatile ("mov r0, #0" ::: "r0");
25 // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
26 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
27
28
mp3_decode(void)29 static void mp3_decode(void)
30 {
31 int mp3_offs = shared_ctl->mp3_offs;
32 unsigned char *readPtr = mp3_data + mp3_offs;
33 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
34 int offset; // frame offset from readPtr
35 int retries = 0, err;
36
37 if (bytesLeft <= 0) return; // EOF, nothing to do
38
39 for (retries = 0; retries < 2; retries++)
40 {
41 offset = mp3_find_sync_word(readPtr, bytesLeft);
42 if (offset < 0)
43 goto set_eof;
44
45 readPtr += offset;
46 bytesLeft -= offset;
47
48 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
49 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
50 if (err) {
51 if (err == ERR_MP3_MAINDATA_UNDERFLOW)
52 // just need another frame
53 continue;
54
55 if (err == ERR_MP3_INDATA_UNDERFLOW)
56 goto set_eof;
57
58 if (err <= -6 && err >= -12) {
59 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
60 // just try to skip the offending frame..
61 readPtr++;
62 bytesLeft--;
63 continue;
64 }
65 shared_ctl->mp3_errors++;
66 shared_ctl->mp3_lasterr = err;
67 }
68 break;
69 }
70
71 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
72 return;
73
74 set_eof:
75 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
76 }
77
ym_flush_writes(void)78 static void ym_flush_writes(void)
79 {
80 UINT16 *wbuff;
81 int i;
82
83 if (shared_ctl->writebuffsel == 1) {
84 wbuff = shared_ctl->writebuff1;
85 } else {
86 wbuff = shared_ctl->writebuff0;
87 }
88
89 /* playback all writes */
90 for (i = 2048; i > 0; i--) {
91 UINT16 d = *wbuff++;
92 if (d == 0xffff) break;
93 if (d == 0xfffe) continue;
94 YM2612Write_(d >> 8, d);
95 }
96 }
97
ym_update(int * ym_buffer)98 static void ym_update(int *ym_buffer)
99 {
100 int i, dw;
101 int two_upds = 0;
102 UINT16 *wbuff;
103
104 if (shared_ctl->writebuffsel == 1) {
105 wbuff = shared_ctl->writebuff1;
106 } else {
107 wbuff = shared_ctl->writebuff0;
108 }
109
110 /* playback all writes */
111 for (i = 2048/2; i > 0; i--) {
112 UINT16 d;
113 dw = *(int *)wbuff;
114 d = dw;
115 wbuff++;
116 if (d == 0xffff) break;
117 if (d == 0xfffe) { two_upds=1; break; }
118 YM2612Write_(d >> 8, d);
119 d = (dw>>16);
120 wbuff++;
121 if (d == 0xffff) break;
122 if (d == 0xfffe) { two_upds=1; break; }
123 YM2612Write_(d >> 8, d);
124 }
125
126 if (two_upds)
127 {
128 int len1 = shared_ctl->length / 2;
129 shared_ctl->ym_active_chs =
130 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
131
132 for (i *= 2; i > 0; i--) {
133 UINT16 d = *wbuff++;
134 if (d == 0xffff) break;
135 YM2612Write_(d >> 8, d);
136 }
137
138 ym_buffer += shared_ctl->stereo ? len1*2 : len1;
139 len1 = shared_ctl->length - len1;
140
141 shared_ctl->ym_active_chs =
142 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
143 } else {
144 shared_ctl->ym_active_chs =
145 YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);
146 }
147 }
148
149
Main940(void)150 void Main940(void)
151 {
152 int *ym_buffer = shared_data->ym_buffer;
153 int job = 0;
154 ym2612_940 = &shared_data->ym2612;
155
156 // extern unsigned __bss_start__, __bss_end__;
157 // memset(&__bss_start__, 0, &__bss_end__ - &__bss_start__);
158
159 for (;;)
160 {
161 job = wait_get_job(job);
162
163 shared_ctl->lastjob = job;
164
165 switch (job)
166 {
167 case JOB940_INITALL:
168 /* ym2612 */
169 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
170 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate, 0);
171 /* Helix mp3 decoder */
172 __malloc_init();
173 shared_data->mp3dec = MP3InitDecoder();
174 break;
175
176 case JOB940_INVALIDATE_DCACHE:
177 drain_wb();
178 dcache_clean_flush();
179 break;
180
181 case JOB940_YM2612RESETCHIP:
182 YM2612ResetChip_();
183 break;
184
185 case JOB940_PICOSTATELOAD:
186 YM2612PicoStateLoad_();
187 break;
188
189 case JOB940_PICOSTATESAVE2:
190 YM2612PicoStateSave2(0, 0);
191 memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);
192 break;
193
194 case JOB940_PICOSTATELOAD2_PREP:
195 ym_flush_writes();
196 break;
197
198 case JOB940_PICOSTATELOAD2:
199 memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);
200 YM2612PicoStateLoad2(0, 0);
201 break;
202
203 case JOB940_YM2612UPDATEONE:
204 ym_update(ym_buffer);
205 break;
206
207 case JOB940_MP3DECODE:
208 mp3_decode();
209 break;
210
211 case JOB940_MP3RESET:
212 if (shared_data->mp3dec) MP3FreeDecoder(shared_data->mp3dec);
213 __malloc_init();
214 shared_data->mp3dec = MP3InitDecoder();
215 break;
216 }
217
218 shared_ctl->loopc++;
219 dcache_clean();
220 }
221 }
222