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#include <gb/gb.hpp>
#define CPU_CPP
namespace GameBoy {
#include "mmio.cpp"
#include "memory.cpp"
#include "timing.cpp"
#include "serialization.cpp"
CPU cpu;
void CPU::Main() {
cpu.main();
}
void CPU::main() {
while(true) {
if(scheduler.sync == Scheduler::SynchronizeMode::CPU) {
scheduler.sync = Scheduler::SynchronizeMode::All;
scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
}
interrupt_test();
exec();
}
}
void CPU::interrupt_raise(CPU::Interrupt id) {
if(id == Interrupt::Vblank) {
status.interrupt_request_vblank = 1;
if(status.interrupt_enable_vblank) r.halt = false;
}
if(id == Interrupt::Stat) {
status.interrupt_request_stat = 1;
if(status.interrupt_enable_stat) r.halt = false;
}
if(id == Interrupt::Timer) {
status.interrupt_request_timer = 1;
if(status.interrupt_enable_timer) r.halt = false;
}
if(id == Interrupt::Serial) {
status.interrupt_request_serial = 1;
if(status.interrupt_enable_serial) r.halt = false;
}
if(id == Interrupt::Joypad) {
status.interrupt_request_joypad = 1;
if(status.interrupt_enable_joypad) r.halt = r.stop = false;
}
}
void CPU::interrupt_test() {
if(r.ime) {
if(status.interrupt_request_vblank && status.interrupt_enable_vblank) {
status.interrupt_request_vblank = 0;
return interrupt_exec(0x0040);
}
if(status.interrupt_request_stat && status.interrupt_enable_stat) {
status.interrupt_request_stat = 0;
return interrupt_exec(0x0048);
}
if(status.interrupt_request_timer && status.interrupt_enable_timer) {
status.interrupt_request_timer = 0;
return interrupt_exec(0x0050);
}
if(status.interrupt_request_serial && status.interrupt_enable_serial) {
status.interrupt_request_serial = 0;
return interrupt_exec(0x0058);
}
if(status.interrupt_request_joypad && status.interrupt_enable_joypad) {
status.interrupt_request_joypad = 0;
return interrupt_exec(0x0060);
}
}
}
void CPU::interrupt_exec(uint16 pc) {
r.ime = 0;
op_write(--r[SP], r[PC] >> 8);
op_write(--r[SP], r[PC] >> 0);
r[PC] = pc;
op_io();
op_io();
op_io();
}
bool CPU::stop() {
if(status.speed_switch) {
status.speed_switch = 0;
status.speed_double ^= 1;
if(status.speed_double == 0) frequency = 4 * 1024 * 1024;
if(status.speed_double == 1) frequency = 8 * 1024 * 1024;
return true;
}
return false;
}
void CPU::power() {
create(Main, 4 * 1024 * 1024);
LR35902::power();
for(unsigned n = 0xc000; n <= 0xdfff; n++) bus.mmio[n] = this; //WRAM
for(unsigned n = 0xe000; n <= 0xfdff; n++) bus.mmio[n] = this; //WRAM (mirror)
for(unsigned n = 0xff80; n <= 0xfffe; n++) bus.mmio[n] = this; //HRAM
bus.mmio[0xff00] = this; //JOYP
bus.mmio[0xff01] = this; //SB
bus.mmio[0xff02] = this; //SC
bus.mmio[0xff04] = this; //DIV
bus.mmio[0xff05] = this; //TIMA
bus.mmio[0xff06] = this; //TMA
bus.mmio[0xff07] = this; //TAC
bus.mmio[0xff0f] = this; //IF
bus.mmio[0xff46] = this; //DMA
bus.mmio[0xffff] = this; //IE
if(system.cgb()) {
bus.mmio[0xff4d] = this; //KEY1
bus.mmio[0xff51] = this; //HDMA1
bus.mmio[0xff52] = this; //HDMA2
bus.mmio[0xff53] = this; //HDMA3
bus.mmio[0xff54] = this; //HDMA4
bus.mmio[0xff55] = this; //HDMA5
bus.mmio[0xff56] = this; //RP
bus.mmio[0xff6c] = this; //???
bus.mmio[0xff70] = this; //SVBK
bus.mmio[0xff72] = this; //???
bus.mmio[0xff73] = this; //???
bus.mmio[0xff74] = this; //???
bus.mmio[0xff75] = this; //???
bus.mmio[0xff76] = this; //???
bus.mmio[0xff77] = this; //???
}
for(auto& n : wram) n = 0x00;
for(auto& n : hram) n = 0x00;
r[PC] = 0x0000;
r[SP] = 0x0000;
r[AF] = 0x0000;
r[BC] = 0x0000;
r[DE] = 0x0000;
r[HL] = 0x0000;
status.clock = 0;
status.p15 = 0;
status.p14 = 0;
status.joyp = 0;
status.mlt_req = 0;
status.serial_data = 0;
status.serial_bits = 0;
status.serial_transfer = 0;
status.serial_clock = 0;
status.div = 0;
status.tima = 0;
status.tma = 0;
status.timer_enable = 0;
status.timer_clock = 0;
status.interrupt_request_joypad = 0;
status.interrupt_request_serial = 0;
status.interrupt_request_timer = 0;
status.interrupt_request_stat = 0;
status.interrupt_request_vblank = 0;
status.speed_double = 0;
status.speed_switch = 0;
status.dma_source = 0;
status.dma_target = 0;
status.dma_mode = 0;
status.dma_length = 0;
status.dma_completed = true;
status.ff6c = 0;
status.ff72 = 0;
status.ff73 = 0;
status.ff74 = 0;
status.ff75 = 0;
status.wram_bank = 1;
status.interrupt_enable_joypad = 0;
status.interrupt_enable_serial = 0;
status.interrupt_enable_timer = 0;
status.interrupt_enable_stat = 0;
status.interrupt_enable_vblank = 0;
oamdma.active = false;
oamdma.bank = 0;
oamdma.offset = 0;
}
}
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