1 // (c) Copyright 2007 notaz, All rights reserved.
4 #include "../PicoInt.h"
7 extern unsigned char formatted_bram[4*0x10];
8 extern unsigned int s68k_poll_adclk;
10 void (*PicoMCDopenTray)(void) = NULL;
11 int (*PicoMCDcloseTray)(void) = NULL;
13 #define dump_ram(ram,fname) \
18 for (i = 0; i < sizeof(ram); i+=2) { \
19 d = (ram[i]<<8) | ram[i+1]; \
20 *(unsigned short *)(ram+i) = d; \
22 f = fopen(fname, "wb"); \
24 fwrite(ram, 1, sizeof(ram), f); \
27 for (i = 0; i < sizeof(ram); i+=2) { \
28 d = (ram[i]<<8) | ram[i+1]; \
29 *(unsigned short *)(ram+i) = d; \
34 PICO_INTERNAL int PicoInitMCD(void)
43 PICO_INTERNAL void PicoExitMCD(void)
47 //dump_ram(Pico_mcd->prg_ram, "prg.bin");
48 //dump_ram(Pico.ram, "ram.bin");
51 PICO_INTERNAL int PicoResetMCD(int 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);
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));
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
73 #ifdef _ASM_CD_MEMORY_C
74 //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
77 // use SRam.data for RAM cart
78 if (SRam.data) free(SRam.data);
81 SRam.data = calloc(1, 0x12000);
86 static __inline void SekRunM68k(int cyc)
90 if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
92 PicoCpuCM68k.cycles=cyc_do;
93 CycloneRun(&PicoCpuCM68k);
94 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
95 #elif defined(EMU_M68K)
96 m68k_set_context(&PicoCpuMM68k);
97 SekCycleCnt+=m68k_execute(cyc_do);
98 #elif defined(EMU_F68K)
99 g_m68kcontext=&PicoCpuFM68k;
100 SekCycleCnt+=m68k_emulate(cyc_do);
104 static __inline void SekRunS68k(int cyc)
107 SekCycleAimS68k+=cyc;
108 if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
109 #if defined(EMU_C68K)
110 PicoCpuCS68k.cycles=cyc_do;
111 CycloneRun(&PicoCpuCS68k);
112 SekCycleCntS68k+=cyc_do-PicoCpuCS68k.cycles;
113 #elif defined(EMU_M68K)
114 m68k_set_context(&PicoCpuMS68k);
115 SekCycleCntS68k+=m68k_execute(cyc_do);
116 #elif defined(EMU_F68K)
117 g_m68kcontext=&PicoCpuFS68k;
118 SekCycleCntS68k+=m68k_emulate(cyc_do);
122 #define PS_STEP_M68K ((488<<16)/20) // ~24
123 //#define PS_STEP_S68K 13
125 #ifdef _ASM_CD_PICO_C
126 void SekRunPS(int cyc_m68k, int cyc_s68k);
128 static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
130 int cycn, cycn_s68k, cyc_do;
131 SekCycleAim+=cyc_m68k;
132 SekCycleAimS68k+=cyc_s68k;
134 // fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
135 // SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
137 /* loop 488 downto 0 in steps of PS_STEP */
138 for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
140 cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
141 if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
142 #if defined(EMU_C68K)
143 PicoCpuCM68k.cycles = cyc_do;
144 CycloneRun(&PicoCpuCM68k);
145 SekCycleCnt += cyc_do - PicoCpuCM68k.cycles;
146 #elif defined(EMU_M68K)
147 m68k_set_context(&PicoCpuMM68k);
148 SekCycleCnt += m68k_execute(cyc_do);
149 #elif defined(EMU_F68K)
150 g_m68kcontext = &PicoCpuFM68k;
151 SekCycleCnt += m68k_emulate(cyc_do);
154 if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
155 #if defined(EMU_C68K)
156 PicoCpuCS68k.cycles = cyc_do;
157 CycloneRun(&PicoCpuCS68k);
158 SekCycleCntS68k += cyc_do - PicoCpuCS68k.cycles;
159 #elif defined(EMU_M68K)
160 m68k_set_context(&PicoCpuMS68k);
161 SekCycleCntS68k += m68k_execute(cyc_do);
162 #elif defined(EMU_F68K)
163 g_m68kcontext = &PicoCpuFS68k;
164 SekCycleCntS68k += m68k_emulate(cyc_do);
172 static __inline void check_cd_dma(void)
176 if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
178 ddx = Pico_mcd->s68k_regs[4] & 7;
179 if (ddx < 2) return; // invalid
181 Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
184 if (ddx == 6) return; // invalid
186 Update_CDC_TRansfer(ddx); // now go and do the actual transfer
189 static __inline void update_chips(void)
191 int counter_timer, int3_set;
192 int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
195 if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
196 Pico_mcd->m.counter75hz -= counter75hz_lim;
201 counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
202 Pico_mcd->m.timer_stopwatch += counter_timer;
203 if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
204 Pico_mcd->m.timer_int3 -= counter_timer;
205 if (Pico_mcd->m.timer_int3 < 0) {
206 if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
207 elprintf(EL_INTS, "s68k: timer irq 3");
209 Pico_mcd->m.timer_int3 += int3_set << 16;
211 // is this really what happens if irq3 is masked out?
212 Pico_mcd->m.timer_int3 &= 0xffffff;
217 if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
220 // delayed setting of DMNA bit (needed for Silpheed)
221 if (Pico_mcd->m.state_flags & 2) {
222 Pico_mcd->m.state_flags &= ~2;
223 if (!(Pico_mcd->s68k_regs[3] & 4)) {
224 Pico_mcd->s68k_regs[3] |= 2;
225 Pico_mcd->s68k_regs[3] &= ~1;
226 #ifdef USE_POLL_DETECT
227 if ((s68k_poll_adclk&0xfe) == 2) {
228 SekSetStopS68k(0); s68k_poll_adclk = 0;
236 static __inline void getSamples(int y)
238 int len = sound_render(0, PsndLen);
239 if (PicoWriteSound) PicoWriteSound(len);
240 // clear sound buffer
246 #include "../PicoFrameHints.c"
249 PICO_INTERNAL int PicoFrameMCD(void)