new acc mode timing, VDP FIFO code

[picodrive.git] / Pico / cd / Pico.c

diff --git a/Pico/cd/Pico.c b/Pico/cd/Pico.c
index 00be7b6..ab0c333 100644 (file)
--- a/Pico/cd/Pico.c
+++ b/Pico/cd/Pico.c
@@ -1,19 +1,14 @@
-// This is part of Pico Library
-
-// (c) Copyright 2004 Dave, All rights reserved.
 // (c) Copyright 2007 notaz, All rights reserved.
-// Free for non-commercial use.
-
-// For commercial use, separate licencing terms must be obtained.
 
 
 #include "../PicoInt.h"
-#include "../sound/sound.h"
 
 
 extern unsigned char formatted_bram[4*0x10];
 extern unsigned int s68k_poll_adclk;
 
+void (*PicoMCDopenTray)(void) = NULL;
+int  (*PicoMCDcloseTray)(void) = NULL;
 
 #define dump_ram(ram,fname) \
 { \
@@ -36,7 +31,7 @@ extern unsigned int s68k_poll_adclk;
 }
 
 
-int PicoInitMCD(void)
+PICO_INTERNAL int PicoInitMCD(void)
 {
   SekInitS68k();
   Init_CD_Driver();
@@ -45,7 +40,7 @@ int PicoInitMCD(void)
 }
 
 
-void PicoExitMCD(void)
+PICO_INTERNAL void PicoExitMCD(void)
 {
   End_CD_Driver();
 
@@ -53,7 +48,7 @@ void PicoExitMCD(void)
   //dump_ram(Pico.ram, "ram.bin");
 }
 
-int PicoResetMCD(int hard)
+PICO_INTERNAL int PicoResetMCD(int hard)
 {
   if (hard) {
     int fmt_size = sizeof(formatted_bram);
@@ -79,10 +74,16 @@ int PicoResetMCD(int hard)
   //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
 #endif
 
+  // use SRam.data for RAM cart
+  if (SRam.data) free(SRam.data);
+  SRam.data = NULL;
+  if (PicoOpt&0x8000)
+    SRam.data = calloc(1, 0x12000);
+
   return 0;
 }
 
-static __inline void SekRun(int cyc)
+static __inline void SekRunM68k(int cyc)
 {
   int cyc_do;
   SekCycleAim+=cyc;
@@ -121,7 +122,7 @@ void SekRunPS(int cyc_m68k, int cyc_s68k);
 static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
 {
   int cycn, cycn_s68k, cyc_do;
-  int d_cm = 0, d_cs = 0, ex;
+  int ex;
   SekCycleAim+=cyc_m68k;
   SekCycleAimS68k+=cyc_s68k;
 
@@ -133,7 +134,6 @@ static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
   {
     ex = 0;
     cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
-//fprintf(stderr, "%3i/%3i:  ", cycn>>16, cycn_s68k);
     if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
 #if defined(EMU_C68K)
       PicoCpu.cycles = cyc_do;
@@ -144,7 +144,6 @@ static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
       SekCycleCnt += (ex = m68k_execute(cyc_do));
 #endif
     }
-//fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0;
     if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
 #if defined(EMU_C68K)
       PicoCpuS68k.cycles = cyc_do;
@@ -155,10 +154,7 @@ static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
       SekCycleCntS68k += (ex = m68k_execute(cyc_do));
 #endif
     }
-//fprintf(stderr, "%3i\n", ex); d_cs += ex;
   }
-
-//fprintf(stderr, "==    end %3i/%3i    ==\n", d_cm, d_cs);
 }
 #endif
 
@@ -198,7 +194,7 @@ static __inline void update_chips(void)
                Pico_mcd->m.timer_int3 -= counter_timer;
                if (Pico_mcd->m.timer_int3 < 0) {
                        if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
-                               dprintf("s68k: timer irq 3");
+                               elprintf(EL_INTS, "s68k: timer irq 3");
                                SekInterruptS68k(3);
                                Pico_mcd->m.timer_int3 += int3_set << 16;
                        }
@@ -214,13 +210,15 @@ static __inline void update_chips(void)
        // delayed setting of DMNA bit (needed for Silpheed)
        if (Pico_mcd->m.state_flags & 2) {
                Pico_mcd->m.state_flags &= ~2;
-               Pico_mcd->s68k_regs[3] |=  2;
-               Pico_mcd->s68k_regs[3] &= ~1;
+               if (!(Pico_mcd->s68k_regs[3] & 4)) {
+                       Pico_mcd->s68k_regs[3] |=  2;
+                       Pico_mcd->s68k_regs[3] &= ~1;
 #ifdef USE_POLL_DETECT
-               if ((s68k_poll_adclk&0xfe) == 2) {
-                       SekSetStopS68k(0); s68k_poll_adclk = 0;
-               }
+                       if ((s68k_poll_adclk&0xfe) == 2) {
+                               SekSetStopS68k(0); s68k_poll_adclk = 0;
+                       }
 #endif
+               }
        }
 }
 
@@ -287,7 +285,7 @@ static int PicoFrameHintsMCD(void)
     {
       //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
       pv->status|=0x88; // V-Int happened, go into vblank
-      SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
+      SekRunM68k(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
       /*if(Pico.m.z80Run && (PicoOpt&4)) {
         z80CycleAim+=cycles_z80/2;
         total_z80+=z80_run(z80CycleAim-total_z80);
@@ -321,18 +319,25 @@ static int PicoFrameHintsMCD(void)
 
     // Run scanline:
       //dprintf("m68k starting exec @ %06x", SekPc);
-    if (Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
+    if (Pico.m.dma_xfers) SekCycleCnt+=CheckDMA();
     if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) {
       SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync"
     } else {
-      SekRun(cycles_68k);
+      SekRunM68k(cycles_68k);
       if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset
         SekRunS68k(cycles_s68k);
     }
 
     if ((PicoOpt&4) && Pico.m.z80Run) {
-      Pico.m.z80Run|=2;
-      z80CycleAim+=cycles_z80;
+      if (Pico.m.z80Run & 2) z80CycleAim+=cycles_z80;
+      else {
+        int cnt = SekCyclesDone() - z80startCycle;
+        cnt = (cnt>>1)-(cnt>>5);
+        //if (cnt > cycles_z80) printf("FIXME: z80 cycles: %i\n", cnt);
+        if (cnt > cycles_z80) cnt = cycles_z80;
+        Pico.m.z80Run |= 2;
+        z80CycleAim+=cnt;
+      }
       total_z80+=z80_run(z80CycleAim-total_z80);
     }
 
@@ -347,7 +352,7 @@ static int PicoFrameHintsMCD(void)
 }
 
 
-int PicoFrameMCD(void)
+PICO_INTERNAL int PicoFrameMCD(void)
 {
   if(!(PicoOpt&0x10))
     PicoFrameStart();