mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
b542be4686
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@295 be3aeb3a-fb24-0410-a615-afba39da0efa
271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
// (c) Copyright 2007 notaz, All rights reserved.
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#include "../PicoInt.h"
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extern unsigned char formatted_bram[4*0x10];
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extern unsigned int s68k_poll_adclk;
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void (*PicoMCDopenTray)(void) = NULL;
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int (*PicoMCDcloseTray)(void) = NULL;
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#define dump_ram(ram,fname) \
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{ \
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int i, d; \
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FILE *f; \
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\
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for (i = 0; i < sizeof(ram); i+=2) { \
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d = (ram[i]<<8) | ram[i+1]; \
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*(unsigned short *)(ram+i) = d; \
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} \
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f = fopen(fname, "wb"); \
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if (f) { \
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fwrite(ram, 1, sizeof(ram), f); \
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fclose(f); \
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} \
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for (i = 0; i < sizeof(ram); i+=2) { \
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d = (ram[i]<<8) | ram[i+1]; \
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*(unsigned short *)(ram+i) = d; \
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} \
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}
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PICO_INTERNAL int PicoInitMCD(void)
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{
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SekInitS68k();
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Init_CD_Driver();
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return 0;
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}
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PICO_INTERNAL void PicoExitMCD(void)
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{
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End_CD_Driver();
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//dump_ram(Pico_mcd->prg_ram, "prg.bin");
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//dump_ram(Pico.ram, "ram.bin");
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}
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PICO_INTERNAL int PicoResetMCD(int hard)
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{
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if (hard) {
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int fmt_size = sizeof(formatted_bram);
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memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
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memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
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memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
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memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
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memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
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}
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memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
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memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
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memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
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*(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
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Pico_mcd->m.state_flags |= 1; // s68k reset pending
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Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
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Reset_CD();
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LC89510_Reset();
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gfx_cd_reset();
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PicoMemResetCD(1);
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#ifdef _ASM_CD_MEMORY_C
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//PicoMemResetCDdecode(1); // don't have to call this in 2M mode
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#endif
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// use SRam.data for RAM cart
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if (SRam.data) free(SRam.data);
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SRam.data = NULL;
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if (PicoOpt&0x8000)
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SRam.data = calloc(1, 0x12000);
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SRam.start = SRam.end = 0; // unused
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return 0;
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}
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static __inline void SekRunM68k(int cyc)
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{
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int cyc_do;
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SekCycleAim+=cyc;
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if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
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#if defined(EMU_CORE_DEBUG)
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SekCycleCnt+=CM_compareRun(cyc_do, 0);
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#elif defined(EMU_C68K)
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PicoCpuCM68k.cycles=cyc_do;
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CycloneRun(&PicoCpuCM68k);
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SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoCpuMM68k);
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SekCycleCnt+=m68k_execute(cyc_do);
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#elif defined(EMU_F68K)
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g_m68kcontext=&PicoCpuFM68k;
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SekCycleCnt+=fm68k_emulate(cyc_do, 0);
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#endif
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}
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static __inline void SekRunS68k(int cyc)
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{
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int cyc_do;
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SekCycleAimS68k+=cyc;
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if ((cyc_do=SekCycleAimS68k-SekCycleCntS68k) <= 0) return;
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#if defined(EMU_CORE_DEBUG)
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SekCycleCntS68k+=CM_compareRun(cyc_do, 1);
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#elif defined(EMU_C68K)
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PicoCpuCS68k.cycles=cyc_do;
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CycloneRun(&PicoCpuCS68k);
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SekCycleCntS68k+=cyc_do-PicoCpuCS68k.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoCpuMS68k);
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SekCycleCntS68k+=m68k_execute(cyc_do);
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#elif defined(EMU_F68K)
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g_m68kcontext=&PicoCpuFS68k;
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SekCycleCntS68k+=fm68k_emulate(cyc_do, 0);
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#endif
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}
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#define PS_STEP_M68K ((488<<16)/20) // ~24
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//#define PS_STEP_S68K 13
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#if defined(_ASM_CD_PICO_C)
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extern void SekRunPS(int cyc_m68k, int cyc_s68k);
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#elif defined(EMU_F68K)
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static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
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{
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SekCycleAim+=cyc_m68k;
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SekCycleAimS68k+=cyc_s68k;
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fm68k_emulate(0, 1);
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}
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#else
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static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
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{
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int cycn, cycn_s68k, cyc_do;
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SekCycleAim+=cyc_m68k;
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SekCycleAimS68k+=cyc_s68k;
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// fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
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// SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
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/* loop 488 downto 0 in steps of PS_STEP */
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for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
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{
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cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
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if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
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#if defined(EMU_C68K)
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PicoCpuCM68k.cycles = cyc_do;
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CycloneRun(&PicoCpuCM68k);
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SekCycleCnt += cyc_do - PicoCpuCM68k.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoCpuMM68k);
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SekCycleCnt += m68k_execute(cyc_do);
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#elif defined(EMU_F68K)
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g_m68kcontext = &PicoCpuFM68k;
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SekCycleCnt += fm68k_emulate(cyc_do, 0);
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#endif
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}
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if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
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#if defined(EMU_C68K)
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PicoCpuCS68k.cycles = cyc_do;
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CycloneRun(&PicoCpuCS68k);
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SekCycleCntS68k += cyc_do - PicoCpuCS68k.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoCpuMS68k);
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SekCycleCntS68k += m68k_execute(cyc_do);
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#elif defined(EMU_F68K)
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g_m68kcontext = &PicoCpuFS68k;
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SekCycleCntS68k += fm68k_emulate(cyc_do, 0);
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#endif
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}
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}
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}
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#endif
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static __inline void check_cd_dma(void)
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{
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int ddx;
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if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
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ddx = Pico_mcd->s68k_regs[4] & 7;
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if (ddx < 2) return; // invalid
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if (ddx < 4) {
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Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
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return;
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}
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if (ddx == 6) return; // invalid
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Update_CDC_TRansfer(ddx); // now go and do the actual transfer
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}
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static __inline void update_chips(void)
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{
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int counter_timer, int3_set;
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int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
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// 75Hz CDC update
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if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
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Pico_mcd->m.counter75hz -= counter75hz_lim;
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Check_CD_Command();
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}
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// update timers
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counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
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Pico_mcd->m.timer_stopwatch += counter_timer;
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if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
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Pico_mcd->m.timer_int3 -= counter_timer;
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if (Pico_mcd->m.timer_int3 < 0) {
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if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
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elprintf(EL_INTS, "s68k: timer irq 3");
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SekInterruptS68k(3);
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Pico_mcd->m.timer_int3 += int3_set << 16;
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}
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// is this really what happens if irq3 is masked out?
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Pico_mcd->m.timer_int3 &= 0xffffff;
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}
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}
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// update gfx chip
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if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
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gfx_cd_update();
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// delayed setting of DMNA bit (needed for Silpheed)
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if (Pico_mcd->m.state_flags & 2) {
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Pico_mcd->m.state_flags &= ~2;
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if (!(Pico_mcd->s68k_regs[3] & 4)) {
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Pico_mcd->s68k_regs[3] |= 2;
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Pico_mcd->s68k_regs[3] &= ~1;
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#ifdef USE_POLL_DETECT
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if ((s68k_poll_adclk&0xfe) == 2) {
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SekSetStopS68k(0); s68k_poll_adclk = 0;
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}
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#endif
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}
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}
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}
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static __inline void getSamples(int y)
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{
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int len = PsndRender(0, PsndLen);
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if (PicoWriteSound) PicoWriteSound(len);
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// clear sound buffer
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PsndClear();
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}
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#define PICO_CD
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#include "../PicoFrameHints.c"
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PICO_INTERNAL int PicoFrameMCD(void)
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{
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if(!(PicoOpt&0x10))
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PicoFrameStart();
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PicoFrameHints();
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return 0;
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}
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