mirror of https://github.com/bsnes-emu/bsnes.git
116 lines
4.7 KiB
C++
116 lines
4.7 KiB
C++
auto CPU::readByte(uint24 addr) -> uint16 {
|
|
if(addr >= 0x000000 && addr <= 0x3fffff) {
|
|
if(!io.romEnable) return tmss[addr & 0x7ff];
|
|
return cartridge.read(addr & ~1).byte(!addr.bit(0));
|
|
}
|
|
if(addr >= 0xa00000 && addr <= 0xa0ffff) return apu.granted() ? apu.read(addr) : (uint8)0x00;
|
|
if(addr >= 0xa10000 && addr <= 0xa10fff) return readIO(addr & ~0xff00);
|
|
if(addr >= 0xa11000 && addr <= 0xa11fff) return readIO(addr & ~0x00ff);
|
|
if(addr >= 0xa13000 && addr <= 0xa130ff) return cartridge.readIO(addr);
|
|
if(addr >= 0xc00000 && addr <= 0xdfffff) return vdp.read(addr & ~1).byte(!addr.bit(0));
|
|
if(addr >= 0xe00000 && addr <= 0xffffff) {
|
|
return ram[addr & 0xffff];
|
|
}
|
|
return 0x0000;
|
|
}
|
|
|
|
auto CPU::readWord(uint24 addr) -> uint16 {
|
|
if(addr >= 0x000000 && addr <= 0x3fffff) {
|
|
if(!io.romEnable) return tmss[addr & 0x7fe | 0] << 8 | tmss[addr & 0x7fe | 1] << 0;
|
|
return cartridge.read(addr);
|
|
}
|
|
if(addr >= 0xa00000 && addr <= 0xa0ffff) return apu.granted() ? apu.read(addr) : (uint8)0x00;
|
|
if(addr >= 0xa10000 && addr <= 0xa10fff) return readIO(addr & ~0xff00) << 0;
|
|
if(addr >= 0xa11000 && addr <= 0xa11fff) return readIO(addr & ~0x00ff) << 8;
|
|
if(addr >= 0xa13000 && addr <= 0xa130ff) return cartridge.readIO(addr);
|
|
if(addr >= 0xc00000 && addr <= 0xdfffff) return vdp.read(addr);
|
|
if(addr >= 0xe00000 && addr <= 0xffffff) {
|
|
uint16 data = ram[addr + 0 & 0xffff] << 8;
|
|
return data | ram[addr + 1 & 0xffff] << 0;
|
|
}
|
|
return 0x0000;
|
|
}
|
|
|
|
auto CPU::writeByte(uint24 addr, uint16 data) -> void {
|
|
if(addr >= 0x000000 && addr <= 0x3fffff) return cartridge.write(addr & ~1, data << 8 | data << 0);
|
|
if(addr >= 0xa00000 && addr <= 0xa0ffff) return apu.granted() ? apu.write(addr, data) : (void)0;
|
|
if(addr >= 0xa10000 && addr <= 0xa10fff) return writeIO(addr & ~0xff00, data);
|
|
if(addr >= 0xa11000 && addr <= 0xa11fff) return writeIO(addr & ~0x00ff, data);
|
|
if(addr >= 0xa13000 && addr <= 0xa130ff) return cartridge.writeIO(addr, data);
|
|
if(addr >= 0xa14000 && addr <= 0xa140ff) return writeIO(addr & ~0xff00, data);
|
|
if(addr >= 0xa14100 && addr <= 0xa141ff) return writeIO(addr & ~0x00ff, data);
|
|
if(addr >= 0xc00000 && addr <= 0xc0000f) return vdp.write(addr & ~1, data << 8 | data << 0);
|
|
if(addr >= 0xc00010 && addr <= 0xc00017) return psg.write(data);
|
|
if(addr >= 0xe00000 && addr <= 0xffffff) {
|
|
ram[addr & 0xffff] = data;
|
|
return;
|
|
}
|
|
}
|
|
|
|
auto CPU::writeWord(uint24 addr, uint16 data) -> void {
|
|
if(addr >= 0x000000 && addr <= 0x3fffff) return cartridge.write(addr, data);
|
|
if(addr >= 0xa00000 && addr <= 0xa0ffff) return apu.granted() ? apu.write(addr, data) : (void)0;
|
|
if(addr >= 0xa10000 && addr <= 0xa10fff) return writeIO(addr & ~0xff00, data >> 0);
|
|
if(addr >= 0xa11000 && addr <= 0xa11fff) return writeIO(addr & ~0x00ff, data >> 8);
|
|
if(addr >= 0xa13000 && addr <= 0xa130ff) return cartridge.writeIO(addr, data);
|
|
if(addr >= 0xa14000 && addr <= 0xa140ff) return writeIO(addr & ~0xff00, data >> 0);
|
|
if(addr >= 0xa14100 && addr <= 0xa141ff) return writeIO(addr & ~0x00ff, data >> 8);
|
|
if(addr >= 0xc00000 && addr <= 0xc0000f) return vdp.write(addr, data);
|
|
if(addr >= 0xc00010 && addr <= 0xc00017) return psg.write(data);
|
|
if(addr >= 0xe00000 && addr <= 0xffffff) {
|
|
ram[addr + 0 & 0xffff] = data >> 8;
|
|
ram[addr + 1 & 0xffff] = data >> 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
auto CPU::readIO(uint24 addr) -> uint16 {
|
|
switch(addr & ~1) {
|
|
case 0xa10000: return (
|
|
!Region::NTSCJ() << 7 //0 = domestic (Japan); 1 = export
|
|
| Region::PAL() << 6 //0 = NTSC; 1 = PAL
|
|
| 1 << 5 //0 = Mega CD connected; 1 = no expansion connected
|
|
| io.version << 0 //0 = Model 1; 1 = Model 2+
|
|
);
|
|
|
|
case 0xa10002: return controllerPort1.device->readData();
|
|
case 0xa10004: return controllerPort2.device->readData();
|
|
case 0xa10006: return extensionPort.device->readData();
|
|
|
|
case 0xa10008: return controllerPort1.readControl();
|
|
case 0xa1000a: return controllerPort2.readControl();
|
|
case 0xa1000c: return extensionPort.readControl();
|
|
|
|
case 0xa11100: return !apu.granted();
|
|
}
|
|
|
|
return 0x0000;
|
|
}
|
|
|
|
auto CPU::writeIO(uint24 addr, uint16 data) -> void {
|
|
switch(addr & ~1) {
|
|
case 0xa10002: return controllerPort1.device->writeData(data);
|
|
case 0xa10004: return controllerPort2.device->writeData(data);
|
|
case 0xa10006: return extensionPort.device->writeData(data);
|
|
|
|
case 0xa10008: return controllerPort1.writeControl(data);
|
|
case 0xa1000a: return controllerPort2.writeControl(data);
|
|
case 0xa1000c: return extensionPort.writeControl(data);
|
|
|
|
case 0xa11100: return apu.request(data.bit(0));
|
|
case 0xa11200: return apu.enable(data.bit(0));
|
|
|
|
case 0xa14000:
|
|
io.vdpEnable[0] = data == 0x5345;
|
|
return;
|
|
|
|
case 0xa14002:
|
|
io.vdpEnable[1] = data == 0x4741;
|
|
return;
|
|
|
|
case 0xa14100:
|
|
io.romEnable = data.bit(0);
|
|
return;
|
|
}
|
|
}
|