mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
0af33fe0ef
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@217 be3aeb3a-fb24-0410-a615-afba39da0efa
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
// (c) Copyright 2006 notaz, All rights reserved.
|
|
|
|
|
|
#include "../PicoInt.h"
|
|
|
|
|
|
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
|
|
static int SekIntAckS68kM(int level)
|
|
{
|
|
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 acknowledgement
|
|
static int SekIntAckS68k(int level)
|
|
{
|
|
int level_new = new_irq_level(level);
|
|
|
|
dprintf("s68kACK %i -> %i", level, level_new);
|
|
PicoCpuS68k.irq = level_new;
|
|
return CYCLONE_INT_ACK_AUTOVECTOR;
|
|
}
|
|
|
|
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..
|
|
void *oldcontext = m68ki_cpu_p;
|
|
m68k_set_context(&PicoS68kCPU);
|
|
m68k_set_cpu_type(M68K_CPU_TYPE_68000);
|
|
m68k_init();
|
|
m68k_set_int_ack_callback(SekIntAckS68kM);
|
|
// m68k_pulse_reset(); // not yet, memmap is not set up
|
|
m68k_set_context(oldcontext);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Reset the 68000:
|
|
int SekResetS68k()
|
|
{
|
|
if (Pico.rom==NULL) return 1;
|
|
|
|
#ifdef EMU_C68K
|
|
PicoCpuS68k.state_flags=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;
|
|
|
|
m68k_set_context(&PicoS68kCPU);
|
|
m68ki_cpu.sp[0]=0;
|
|
m68k_set_irq(0);
|
|
m68k_pulse_reset();
|
|
m68k_set_context(oldcontext);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
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(real_irq); // raise irq (gets lowered after taken or must be done in ack)
|
|
m68k_set_context(oldcontext);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|