cc68a136 |
1 | #include "940shared.h"\r |
2 | \r |
3 | /* this code assumes that we live @ 0x3000000 bank */\r |
4 | //static volatile unsigned short *gp2x_memregs = (void *) 0x0xbd000000;\r |
5 | //static volatile unsigned long *gp2x_memregl = (void *) 0x0xbd000000;\r |
6 | \r |
7 | static _940_data_t *shared_data = (_940_data_t *) 0x100000;\r |
8 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x200000;\r |
9 | YM2612 *ym2612_940;\r |
10 | int *mix_buffer;\r |
11 | \r |
12 | // from init.s\r |
13 | void wait_irq(void);\r |
14 | void spend_cycles(int c);\r |
15 | void cache_clean(void);\r |
16 | void cache_clean_flush(void);\r |
17 | \r |
18 | // asm volatile ("mov r0, #0" ::: "r0");\r |
19 | // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r |
20 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r |
21 | \r |
22 | void Main940(int startvector)\r |
23 | {\r |
24 | ym2612_940 = &shared_data->ym2612;\r |
25 | mix_buffer = shared_data->mix_buffer;\r |
26 | \r |
27 | // debug\r |
28 | shared_ctl->vstarts[startvector]++;\r |
29 | asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r |
30 | \r |
31 | /* unmask IRQs */\r |
32 | \r |
33 | for (;; shared_ctl->loopc++)\r |
34 | {\r |
35 | /*\r |
36 | while (!shared_ctl->busy)\r |
37 | {\r |
38 | //shared_ctl->waitc++;\r |
39 | spend_cycles(256);\r |
40 | }\r |
41 | */\r |
42 | if (!shared_ctl->busy)\r |
43 | {\r |
44 | wait_irq();\r |
45 | }\r |
46 | \r |
47 | switch (shared_ctl->job)\r |
48 | {\r |
49 | case JOB940_YM2612INIT:\r |
50 | shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r |
51 | YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r |
52 | break;\r |
53 | \r |
54 | case JOB940_YM2612RESETCHIP:\r |
55 | YM2612ResetChip_();\r |
56 | break;\r |
57 | \r |
58 | case JOB940_PICOSTATELOAD:\r |
59 | YM2612PicoStateLoad_();\r |
60 | break;\r |
61 | \r |
62 | case JOB940_YM2612UPDATEONE: {\r |
63 | int i, dw, *wbuff;\r |
64 | if (shared_ctl->writebuffsel == 1) {\r |
65 | wbuff = (int *) shared_ctl->writebuff1;\r |
66 | } else {\r |
67 | wbuff = (int *) shared_ctl->writebuff0;\r |
68 | }\r |
69 | \r |
70 | /* playback all writes */\r |
71 | for (i = 2048/2; i > 0; i--) {\r |
72 | UINT16 d;\r |
73 | dw = *wbuff++;\r |
74 | d = dw;\r |
75 | if (d == 0xffff) break;\r |
76 | YM2612Write_(d >> 8, d);\r |
77 | d = (dw>>16);\r |
78 | if (d == 0xffff) break;\r |
79 | YM2612Write_(d >> 8, d);\r |
80 | }\r |
81 | \r |
82 | YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);\r |
83 | // cache_clean_flush();\r |
84 | cache_clean();\r |
85 | // asm volatile ("mov r0, #0" ::: "r0");\r |
86 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r |
87 | break;\r |
88 | }\r |
89 | }\r |
90 | \r |
91 | shared_ctl->busy = 0;\r |
92 | }\r |
93 | }\r |