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bsnes/higan/gba/cpu/io.cpp

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auto CPU::readIO(uint32 addr) -> uint8 {
auto dma = [&]() -> DMA& { return this->dma[addr / 12 & 3]; };
auto timer = [&]() -> Timer& { return this->timer[addr.bits(2,3)]; };
switch(addr) {
//DMA0CNT_L, DMA1CNT_L, DMA2CNT_L, DMA3CNT_L
case 0x0400'00b8: case 0x0400'00c4: case 0x0400'00d0: case 0x0400'00dc: return 0x00;
case 0x0400'00b9: case 0x0400'00c5: case 0x0400'00d1: case 0x0400'00dd: return 0x00;
//DMA0CNT_H, DMA1CNT_H, DMA2CNT_H, DMA3CNT_H
case 0x0400'00ba: case 0x0400'00c6: case 0x0400'00d2: case 0x0400'00de: return (
dma().targetMode << 5
| dma().sourceMode.bit(0) << 7
);
case 0x0400'00bb: case 0x0400'00c7: case 0x0400'00d3: case 0x0400'00df: return (
dma().sourceMode.bit(1) << 0
| dma().repeat << 1
| dma().size << 2
| dma().drq << 3
| dma().timingMode << 4
| dma().irq << 6
| dma().enable << 7
);
//TM0CNT_L, TM1CNT_L, TM2CNT_L, TM3CNT_L
case 0x0400'0100: case 0x0400'0104: case 0x0400'0108: case 0x0400'010c: return timer().period.byte(0);
case 0x0400'0101: case 0x0400'0105: case 0x0400'0109: case 0x0400'010d: return timer().period.byte(1);
//TM0CNT_H, TM1CNT_H, TM2CNT_H, TM3CNT_H
case 0x0400'0102: case 0x0400'0106: case 0x0400'010a: case 0x0400'010e: return (
timer().frequency << 0
| timer().cascade << 2
| timer().irq << 6
| timer().enable << 7
);
case 0x0400'0103: case 0x0400'0107: case 0x0400'010b: case 0x0400'010f: return 0;
//SIOMULTI0 (SIODATA32_L), SIOMULTI1 (SIODATA32_H), SIOMULTI2, SIOMULTI3
case 0x0400'0120: case 0x0400'0122: case 0x0400'0124: case 0x0400'0126: {
if(auto data = player.read()) return data().byte(addr.bits(0,1));
return serial.data[addr.bits(1,2)].byte(0);
}
case 0x0400'0121: case 0x0400'0123: case 0x0400'0125: case 0x0400'0127: {
if(auto data = player.read()) return data().byte(addr.bits(0,1));
return serial.data[addr.bits(1,2)].byte(1);
}
//SIOCNT
case 0x0400'0128: return (
serial.shiftClockSelect << 0
| serial.shiftClockFrequency << 1
| serial.transferEnableReceive << 2
| serial.transferEnableSend << 3
| serial.startBit << 7
);
case 0x0400'0129: return (
serial.transferLength << 4
| serial.irqEnable << 6
);
//SIOMLT_SEND (SIODATA8)
case 0x0400'012a: return serial.data8;
case 0x0400'012b: return 0;
//KEYINPUT
case 0x04000130: {
static const uint landscape[] = {5, 4, 8, 9, 3, 2, 0, 1};
static const uint portrait[] = {5, 4, 8, 9, 0, 1, 2, 3};
auto lookup = !settings.rotateLeft ? landscape : portrait;
if(auto result = player.keyinput()) return result() >> 0;
uint8 result = 0;
for(uint n = 0; n < 8; n++) result |= platform->inputPoll(0, 0, lookup[n]) << n;
if((result & 0xc0) == 0xc0) result &= (uint8)~0xc0; //up+down cannot be pressed simultaneously
if((result & 0x30) == 0x30) result &= (uint8)~0x30; //left+right cannot be pressed simultaneously
return result ^ 0xff;
}
case 0x04000131: {
if(auto result = player.keyinput()) return result() >> 8;
uint8 result = 0;
result |= platform->inputPoll(0, 0, 7) << 0;
result |= platform->inputPoll(0, 0, 6) << 1;
return result ^ 0x03;
}
//KEYCNT
case 0x0400'0132: return (
keypad.flag[0] << 0
| keypad.flag[1] << 1
| keypad.flag[2] << 2
| keypad.flag[3] << 3
| keypad.flag[4] << 4
| keypad.flag[5] << 5
| keypad.flag[6] << 6
| keypad.flag[7] << 7
);
case 0x0400'0133: return (
keypad.flag[8] << 0
| keypad.flag[9] << 1
| keypad.enable << 6
| keypad.condition << 7
);
//RCNT
case 0x0400'0134: return (
joybus.sc << 0
| joybus.sd << 1
| joybus.si << 2
| joybus.so << 3
| joybus.scMode << 4
| joybus.sdMode << 5
| joybus.siMode << 6
| joybus.soMode << 7
);
case 0x0400'0135: return (
joybus.siIRQEnable << 0
| joybus.mode << 6
);
//JOYCNT
case 0x0400'0140: return (
joybus.resetSignal << 0
| joybus.receiveComplete << 1
| joybus.sendComplete << 2
| joybus.resetIRQEnable << 6
);
case 0x0400'0141: return 0;
case 0x0400'0142: return 0;
case 0x0400'0143: return 0;
//JOY_RECV_L, JOY_RECV_H
case 0x0400'0150: return joybus.receive.byte(0);
case 0x0400'0151: return joybus.receive.byte(1);
case 0x0400'0152: return joybus.receive.byte(2);
case 0x0400'0153: return joybus.receive.byte(3);
//JOY_TRANS_L, JOY_TRANS_H
case 0x0400'0154: return joybus.transmit.byte(0);
case 0x0400'0155: return joybus.transmit.byte(1);
case 0x0400'0156: return joybus.transmit.byte(2);
case 0x0400'0157: return joybus.transmit.byte(3);
//JOYSTAT
case 0x0400'0158: return (
joybus.receiveFlag << 1
| joybus.sendFlag << 3
| joybus.generalFlag << 4
);
case 0x0400'0159: return 0;
case 0x0400'015a: return 0;
case 0x0400'015b: return 0;
//IE
case 0x0400'0200: return irq.enable.byte(0);
case 0x0400'0201: return irq.enable.byte(1);
//IF
case 0x0400'0202: return irq.flag.byte(0);
case 0x0400'0203: return irq.flag.byte(1);
//WAITCNT
case 0x0400'0204: return (
wait.nwait[3] << 0
| wait.nwait[0] << 2
| wait.swait[0] << 4
| wait.nwait[1] << 5
| wait.swait[1] << 7
);
case 0x0400'0205: return (
wait.nwait[2] << 0
| wait.swait[2] << 2
| wait.phi << 3
| wait.prefetch << 6
| wait.gameType << 7
);
//IME
case 0x0400'0208: return irq.ime;
case 0x0400'0209: return 0;
//POSTFLG + HALTCNT
case 0x0400'0300: return context.booted;
case 0x0400'0301: return 0;
//MEMCNT_L
case 0x0400'0800: return (
memory.disable << 0
| memory.unknown1 << 1
| memory.ewram << 5
);
case 0x0400'0801: return 0;
//MEMCNT_H
case 0x0400'0802: return 0;
case 0x0400'0803: return (
memory.ewramWait << 0
| memory.unknown2 << 4
);
}
return cpu.pipeline.fetch.instruction.byte(addr & 1);
}
auto CPU::writeIO(uint32 addr, uint8 data) -> void {
auto dma = [&]() -> DMA& { return this->dma[addr / 12 & 3]; };
auto timer = [&]() -> Timer& { return this->timer[addr.bits(2,3)]; };
switch(addr) {
//DMA0SAD, DMA1SAD, DMA2SAD, DMA3SAD
case 0x0400'00b0: case 0x0400'00bc: case 0x0400'00c8: case 0x0400'00d4: dma().source.byte(0) = data; return;
case 0x0400'00b1: case 0x0400'00bd: case 0x0400'00c9: case 0x0400'00d5: dma().source.byte(1) = data; return;
case 0x0400'00b2: case 0x0400'00be: case 0x0400'00ca: case 0x0400'00d6: dma().source.byte(2) = data; return;
case 0x0400'00b3: case 0x0400'00bf: case 0x0400'00cb: case 0x0400'00d7: dma().source.byte(3) = data; return;
//DMA0DAD, DMA1DAD, DMA2DAD, DMA3DAD
case 0x0400'00b4: case 0x0400'00c0: case 0x0400'00cc: case 0x0400'00d8: dma().target.byte(0) = data; return;
case 0x0400'00b5: case 0x0400'00c1: case 0x0400'00cd: case 0x0400'00d9: dma().target.byte(1) = data; return;
case 0x0400'00b6: case 0x0400'00c2: case 0x0400'00ce: case 0x0400'00da: dma().target.byte(2) = data; return;
case 0x0400'00b7: case 0x0400'00c3: case 0x0400'00cf: case 0x0400'00db: dma().target.byte(3) = data; return;
//DMA0CNT_L, DMA1CNT_L, DMA2CNT_L, DMA3CNT_L
case 0x0400'00b8: case 0x0400'00c4: case 0x0400'00d0: case 0x0400'00dc: dma().length.byte(0) = data; return;
case 0x0400'00b9: case 0x0400'00c5: case 0x0400'00d1: case 0x0400'00dd: dma().length.byte(1) = data; return;
//DMA0CNT_H, DMA1CNT_H, DMA2CNT_H, DMA3CNT_H
case 0x0400'00ba: case 0x0400'00c6: case 0x0400'00d2: case 0x0400'00de:
dma().targetMode = data.bits(5,6);
dma().sourceMode.bit(0) = data.bit (7);
return;
case 0x0400'00bb: case 0x0400'00c7: case 0x0400'00d3: case 0x0400'00df: {
bool enable = dma().enable;
if(addr != 0x0400'00df) data.bit(3) = 0; //gamepad DRQ valid for DMA3 only
dma().sourceMode.bit(1) = data.bit (0);
dma().repeat = data.bit (1);
dma().size = data.bit (2);
dma().drq = data.bit (3);
dma().timingMode = data.bits(4,5);
dma().irq = data.bit (6);
dma().enable = data.bit (7);
if(!enable && dma().enable) { //0->1 transition
if(dma().timingMode == 0) {
dma().active = true; //immediate transfer mode
dma().waiting = 2;
}
dma().latch.target = dma().target;
dma().latch.source = dma().source;
dma().latch.length = dma().length;
} else if(!dma().enable) {
dma().active = false;
}
return;
}
//TM0CNT_L, TM1CNT_L, TM2CNT_L, TM3CNT_L
case 0x0400'0100: case 0x0400'0104: case 0x0400'0108: case 0x0400'010c: timer().reload.byte(0) = data; return;
case 0x0400'0101: case 0x0400'0105: case 0x0400'0109: case 0x0400'010d: timer().reload.byte(1) = data; return;
//TM0CNT_H, TM1CNT_H, TM2CNT_H, TM3CNT_H
case 0x0400'0102: case 0x0400'0106: case 0x0400'010a: case 0x0400'010e: {
bool enable = timer().enable;
timer().frequency = data.bits(0,1);
timer().cascade = data.bit (2);
timer().irq = data.bit (6);
timer().enable = data.bit (7);
if(!enable && timer().enable) { //0->1 transition
timer().pending = true;
}
return;
}
case 0x0400'0103: case 0x0400'0107: case 0x0400'010b: case 0x0400'010f:
return;
//SIOMULTI0 (SIODATA32_L), SIOMULTI1 (SIODATA32_H), SIOMULTI2, SIOMULTI3
case 0x0400'0120: case 0x0400'0122: case 0x0400'0124: case 0x0400'0126:
player.write(addr.bits(0,1), data);
serial.data[addr.bits(1,2)].byte(0) = data;
return;
case 0x0400'0121: case 0x0400'0123: case 0x0400'0125: case 0x0400'0127:
player.write(addr.bits(0,1), data);
serial.data[addr.bits(1,2)].byte(1) = data;
return;
//SIOCNT
case 0x0400'0128:
serial.shiftClockSelect = data.bit(0);
serial.shiftClockFrequency = data.bit(1);
serial.transferEnableReceive = data.bit(2);
serial.transferEnableSend = data.bit(3);
serial.startBit = data.bit(7);
return;
case 0x0400'0129:
serial.transferLength = data.bit(4);
serial.irqEnable = data.bit(6);
return;
//SIOMLT_SEND (SIODATA8)
case 0x0400'012a: serial.data8 = data; return;
case 0x0400'012b: return;
//KEYCNT
case 0x0400'0132:
keypad.flag[0] = data.bit(0);
keypad.flag[1] = data.bit(1);
keypad.flag[2] = data.bit(2);
keypad.flag[3] = data.bit(3);
keypad.flag[4] = data.bit(4);
keypad.flag[5] = data.bit(5);
keypad.flag[6] = data.bit(6);
keypad.flag[7] = data.bit(7);
return;
case 0x0400'0133:
keypad.flag[8] = data.bit(0);
keypad.flag[9] = data.bit(1);
keypad.enable = data.bit(6);
keypad.condition = data.bit(7);
return;
//RCNT
case 0x0400'0134:
joybus.sc = data.bit(0);
joybus.sd = data.bit(1);
joybus.si = data.bit(2);
joybus.so = data.bit(3);
joybus.scMode = data.bit(4);
joybus.sdMode = data.bit(5);
joybus.siMode = data.bit(6);
joybus.soMode = data.bit(7);
return;
case 0x0400'0135:
joybus.siIRQEnable = data.bit (0);
joybus.mode = data.bits(6,7);
return;
//JOYCNT
case 0x0400'0140:
joybus.resetSignal = data.bit(0);
joybus.receiveComplete = data.bit(1);
joybus.sendComplete = data.bit(2);
joybus.resetIRQEnable = data.bit(6);
return;
case 0x0400'0141: return;
case 0x0400'0142: return;
case 0x0400'0143: return;
//JOY_RECV_L
//JOY_RECV_H
case 0x0400'0150: joybus.receive.byte(0) = data; return;
case 0x0400'0151: joybus.receive.byte(1) = data; return;
case 0x0400'0152: joybus.receive.byte(2) = data; return;
case 0x0400'0153: joybus.receive.byte(3) = data; return;
//JOY_TRANS_L
//JOY_TRANS_H
case 0x0400'0154: joybus.transmit.byte(0) = data; return;
case 0x0400'0155: joybus.transmit.byte(1) = data; return;
case 0x0400'0156: joybus.transmit.byte(2) = data; return;
case 0x0400'0157: joybus.transmit.byte(3) = data; return;
//JOYSTAT
case 0x0400'0158:
joybus.receiveFlag = data.bit (1);
joybus.sendFlag = data.bit (3);
joybus.generalFlag = data.bits(4,5);
return;
case 0x0400'0159: return;
//IE
case 0x0400'0200: irq.enable.byte(0) = data; return;
case 0x0400'0201: irq.enable.byte(1) = data; return;
//IF
case 0x0400'0202: irq.flag.byte(0) = irq.flag.byte(0) & ~data; return;
case 0x0400'0203: irq.flag.byte(1) = irq.flag.byte(1) & ~data; return;
//WAITCNT
case 0x0400'0204:
wait.swait[3] = data.bit (0); //todo: is this correct?
wait.nwait[3] = data.bits(0,1);
wait.nwait[0] = data.bits(2,3);
wait.swait[0] = data.bit (4);
wait.nwait[1] = data.bits(5,6);
wait.swait[1] = data.bit (7);
return;
case 0x0400'0205:
wait.nwait[2] = data.bits(0,1);
wait.swait[2] = data.bit (2);
wait.phi = data.bit (3);
wait.prefetch = data.bit (6);
//wait.gameType is read-only
return;
//IME
case 0x0400'0208: irq.ime = data.bit(0); return;
case 0x0400'0209: return;
//POSTFLG, HALTCNT
case 0x0400'0300:
if(data.bit(0)) context.booted = 1;
return;
case 0x0400'0301:
context.halted = data.bit(7) == 0;
context.stopped = data.bit(7) == 1;
return;
//MEMCNT_L
//MEMCNT_H
case 0x0400'0800:
memory.disable = data.bit (0);
memory.unknown1 = data.bits(1,3);
memory.ewram = data.bit (5);
return;
case 0x0400'0801: return;
case 0x0400'0802: return;
case 0x0400'0803:
memory.ewramWait = data.bits(0,3);
memory.unknown2 = data.bits(4,7);
return;
}
}
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