reverted useless threaded buffering code
[picodrive.git] / Pico / cd / Pico.c
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CommitLineData
1// (c) Copyright 2007 notaz, All rights reserved.
2
3
4#include "../PicoInt.h"
5
6
7extern unsigned char formatted_bram[4*0x10];
8extern unsigned int s68k_poll_adclk;
9
10void (*PicoMCDopenTray)(void) = NULL;
11int (*PicoMCDcloseTray)(void) = NULL;
12
13#define dump_ram(ram,fname) \
14{ \
15 int i, d; \
16 FILE *f; \
17\
18 for (i = 0; i < sizeof(ram); i+=2) { \
19 d = (ram[i]<<8) | ram[i+1]; \
20 *(unsigned short *)(ram+i) = d; \
21 } \
22 f = fopen(fname, "wb"); \
23 if (f) { \
24 fwrite(ram, 1, sizeof(ram), f); \
25 fclose(f); \
26 } \
27 for (i = 0; i < sizeof(ram); i+=2) { \
28 d = (ram[i]<<8) | ram[i+1]; \
29 *(unsigned short *)(ram+i) = d; \
30 } \
31}
32
33
34PICO_INTERNAL int PicoInitMCD(void)
35{
36 SekInitS68k();
37 Init_CD_Driver();
38
39 return 0;
40}
41
42
43PICO_INTERNAL void PicoExitMCD(void)
44{
45 End_CD_Driver();
46
47 //dump_ram(Pico_mcd->prg_ram, "prg.bin");
48 //dump_ram(Pico.ram, "ram.bin");
49}
50
51PICO_INTERNAL int PicoResetMCD(int hard)
52{
53 if (hard) {
54 int fmt_size = sizeof(formatted_bram);
55 memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
56 memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
57 memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
58 memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
59 memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
60 }
61 memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
62 memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
63 memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
64
65 *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
66 Pico_mcd->m.state_flags |= 1; // s68k reset pending
67 Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
68
69 Reset_CD();
70 LC89510_Reset();
71 gfx_cd_reset();
72 PicoMemResetCD(1);
73#ifdef _ASM_CD_MEMORY_C
74 //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
75#endif
76
77 // use SRam.data for RAM cart
78 if (SRam.data) free(SRam.data);
79 SRam.data = NULL;
80 if (PicoOpt&0x8000)
81 SRam.data = calloc(1, 0x12000);
82 SRam.start = SRam.end = 0; // unused
83
84 return 0;
85}
86
87static __inline void SekRunM68k(int cyc)
88{
89 int cyc_do;
90 SekCycleAim+=cyc;
91 if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
92#if defined(EMU_CORE_DEBUG)
93 SekCycleCnt+=CM_compareRun(cyc_do, 0);
94#elif defined(EMU_C68K)
95 PicoCpuCM68k.cycles=cyc_do;
96 CycloneRun(&PicoCpuCM68k);
97 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
98#elif defined(EMU_M68K)
99 m68k_set_context(&PicoCpuMM68k);
100 SekCycleCnt+=m68k_execute(cyc_do);
101#elif defined(EMU_F68K)
102 g_m68kcontext=&PicoCpuFM68k;
103 SekCycleCnt+=fm68k_emulate(cyc_do, 0);
104#endif
105}
106
107static __inline void SekRunS68k(int cyc)
108{
109 int cyc_do;
110 SekCycleAimS68k+=cyc;
111 if ((cyc_do=SekCycleAimS68k-SekCycleCntS68k) <= 0) return;
112#if defined(EMU_CORE_DEBUG)
113 SekCycleCntS68k+=CM_compareRun(cyc_do, 1);
114#elif defined(EMU_C68K)
115 PicoCpuCS68k.cycles=cyc_do;
116 CycloneRun(&PicoCpuCS68k);
117 SekCycleCntS68k+=cyc_do-PicoCpuCS68k.cycles;
118#elif defined(EMU_M68K)
119 m68k_set_context(&PicoCpuMS68k);
120 SekCycleCntS68k+=m68k_execute(cyc_do);
121#elif defined(EMU_F68K)
122 g_m68kcontext=&PicoCpuFS68k;
123 SekCycleCntS68k+=fm68k_emulate(cyc_do, 0);
124#endif
125}
126
127#define PS_STEP_M68K ((488<<16)/20) // ~24
128//#define PS_STEP_S68K 13
129
130#if defined(_ASM_CD_PICO_C)
131extern void SekRunPS(int cyc_m68k, int cyc_s68k);
132#elif defined(EMU_F68K)
133static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
134{
135 SekCycleAim+=cyc_m68k;
136 SekCycleAimS68k+=cyc_s68k;
137 fm68k_emulate(0, 1);
138}
139#else
140static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
141{
142 int cycn, cycn_s68k, cyc_do;
143 SekCycleAim+=cyc_m68k;
144 SekCycleAimS68k+=cyc_s68k;
145
146// fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
147// SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
148
149 /* loop 488 downto 0 in steps of PS_STEP */
150 for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
151 {
152 cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
153 if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
154#if defined(EMU_C68K)
155 PicoCpuCM68k.cycles = cyc_do;
156 CycloneRun(&PicoCpuCM68k);
157 SekCycleCnt += cyc_do - PicoCpuCM68k.cycles;
158#elif defined(EMU_M68K)
159 m68k_set_context(&PicoCpuMM68k);
160 SekCycleCnt += m68k_execute(cyc_do);
161#elif defined(EMU_F68K)
162 g_m68kcontext = &PicoCpuFM68k;
163 SekCycleCnt += fm68k_emulate(cyc_do, 0);
164#endif
165 }
166 if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
167#if defined(EMU_C68K)
168 PicoCpuCS68k.cycles = cyc_do;
169 CycloneRun(&PicoCpuCS68k);
170 SekCycleCntS68k += cyc_do - PicoCpuCS68k.cycles;
171#elif defined(EMU_M68K)
172 m68k_set_context(&PicoCpuMS68k);
173 SekCycleCntS68k += m68k_execute(cyc_do);
174#elif defined(EMU_F68K)
175 g_m68kcontext = &PicoCpuFS68k;
176 SekCycleCntS68k += fm68k_emulate(cyc_do, 0);
177#endif
178 }
179 }
180}
181#endif
182
183
184static __inline void check_cd_dma(void)
185{
186 int ddx;
187
188 if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
189
190 ddx = Pico_mcd->s68k_regs[4] & 7;
191 if (ddx < 2) return; // invalid
192 if (ddx < 4) {
193 Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
194 return;
195 }
196 if (ddx == 6) return; // invalid
197
198 Update_CDC_TRansfer(ddx); // now go and do the actual transfer
199}
200
201static __inline void update_chips(void)
202{
203 int counter_timer, int3_set;
204 int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
205
206 // 75Hz CDC update
207 if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
208 Pico_mcd->m.counter75hz -= counter75hz_lim;
209 Check_CD_Command();
210 }
211
212 // update timers
213 counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
214 Pico_mcd->m.timer_stopwatch += counter_timer;
215 if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
216 Pico_mcd->m.timer_int3 -= counter_timer;
217 if (Pico_mcd->m.timer_int3 < 0) {
218 if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
219 elprintf(EL_INTS, "s68k: timer irq 3");
220 SekInterruptS68k(3);
221 Pico_mcd->m.timer_int3 += int3_set << 16;
222 }
223 // is this really what happens if irq3 is masked out?
224 Pico_mcd->m.timer_int3 &= 0xffffff;
225 }
226 }
227
228 // update gfx chip
229 if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
230 gfx_cd_update();
231
232 // delayed setting of DMNA bit (needed for Silpheed)
233 if (Pico_mcd->m.state_flags & 2) {
234 Pico_mcd->m.state_flags &= ~2;
235 if (!(Pico_mcd->s68k_regs[3] & 4)) {
236 Pico_mcd->s68k_regs[3] |= 2;
237 Pico_mcd->s68k_regs[3] &= ~1;
238#ifdef USE_POLL_DETECT
239 if ((s68k_poll_adclk&0xfe) == 2) {
240 SekSetStopS68k(0); s68k_poll_adclk = 0;
241 }
242#endif
243 }
244 }
245}
246
247
248static __inline void getSamples(int y)
249{
250 int len = PsndRender(0, PsndLen);
251 if (PicoWriteSound) PicoWriteSound(len);
252 // clear sound buffer
253 PsndClear();
254}
255
256
257#define PICO_CD
258#include "../PicoFrameHints.c"
259
260
261PICO_INTERNAL int PicoFrameMCD(void)
262{
263 if(!(PicoOpt&0x10))
264 PicoFrameStart();
265
266 PicoFrameHints();
267
268 return 0;
269}
270
271