int SekCycleCntS68k=0; // cycles done in this frame
int SekCycleAimS68k=0; // cycle aim
+#ifdef EMU_C68K
+// ---------------------- Cyclone 68000 ----------------------
+struct Cyclone PicoCpuS68k;
+#endif
+
#ifdef EMU_M68K
// ---------------------- MUSASHI 68000 ----------------------
m68ki_cpu_core PicoS68kCPU; // Mega CD's CPU
#endif
+static int new_irq_level(int level)
+{
+ int level_new = 0, irqs;
+ Pico_mcd->m.s68k_pend_ints &= ~(1 << level);
+ irqs = Pico_mcd->m.s68k_pend_ints;
+ irqs &= Pico_mcd->s68k_regs[0x33];
+ while ((irqs >>= 1)) level_new++;
+
+ return level_new;
+}
#ifdef EMU_M68K
-int SekIntAckS68k(int level)
+static int SekIntAckS68k(int level)
{
- dprintf("s68kACK %i", level);
- CPU_INT_LEVEL = 0;
+ int level_new = new_irq_level(level);
+ dprintf("s68kACK %i -> %i", level, level_new);
+ CPU_INT_LEVEL = level_new << 8;
return M68K_INT_ACK_AUTOVECTOR;
}
#endif
+#ifdef EMU_C68K
+// interrupt acknowledgment
+static void SekIntAckS68k(int level)
+{
+ int level_new = new_irq_level(level);
+
+ dprintf("s68kACK %i -> %i", level, level_new);
+ PicoCpuS68k.irq = level_new;
+}
+
+static void SekResetAck()
+{
+ dprintf("s68k: Reset encountered @ %06x", SekPcS68k);
+}
+
+static int SekUnrecognizedOpcode()
+{
+ unsigned int pc, op;
+ pc = SekPcS68k;
+ op = PicoCpuS68k.read16(pc);
+ dprintf("Unrecognized Opcode %04x @ %06x", op, pc);
+ //exit(1);
+ return 0;
+}
+#endif
+
+
int SekInitS68k()
{
+#ifdef EMU_C68K
+// CycloneInit();
+ memset(&PicoCpuS68k,0,sizeof(PicoCpuS68k));
+ PicoCpuS68k.IrqCallback=SekIntAckS68k;
+ PicoCpuS68k.ResetCallback=SekResetAck;
+ PicoCpuS68k.UnrecognizedCallback=SekUnrecognizedOpcode;
+#endif
#ifdef EMU_M68K
{
// Musashi is not very context friendly..
{
if (Pico.rom==NULL) return 1;
+#ifdef EMU_C68K
+ PicoCpuS68k.stopped=0;
+ PicoCpuS68k.osp=0;
+ PicoCpuS68k.srh =0x27; // Supervisor mode
+ PicoCpuS68k.flags=4; // Z set
+ PicoCpuS68k.irq=0;
+ PicoCpuS68k.a[7]=PicoCpuS68k.read32(0); // Stack Pointer
+ PicoCpuS68k.membase=0;
+ PicoCpuS68k.pc=PicoCpuS68k.checkpc(PicoCpuS68k.read32(4)); // Program Counter
+#endif
#ifdef EMU_M68K
{
void *oldcontext = m68ki_cpu_p;
int SekInterruptS68k(int irq)
{
+ int irqs, real_irq = 1;
+ Pico_mcd->m.s68k_pend_ints |= 1 << irq;
+ irqs = Pico_mcd->m.s68k_pend_ints >> 1;
+ while ((irqs >>= 1)) real_irq++; // this is probably only needed for Cyclone
+
+#ifdef EMU_C68K
+ PicoCpuS68k.irq=real_irq;
+#endif
#ifdef EMU_M68K
void *oldcontext = m68ki_cpu_p;
m68k_set_context(&PicoS68kCPU);
- m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack)
+ m68k_set_irq(real_irq); // raise irq (gets lowered after taken or must be done in ack)
m68k_set_context(oldcontext);
#endif
return 0;