mirror of https://github.com/bsnes-emu/bsnes.git
49 lines
1.0 KiB
C++
49 lines
1.0 KiB
C++
auto CPU::portRead(uint2 port) const -> uint8 {
|
|
return status.port[port];
|
|
}
|
|
|
|
auto CPU::portWrite(uint2 port, uint8 data) -> void {
|
|
status.port[port] = data;
|
|
}
|
|
|
|
auto CPU::op_io() -> void {
|
|
status.clock_count = 6;
|
|
dma_edge();
|
|
add_clocks(6);
|
|
alu_edge();
|
|
}
|
|
|
|
auto CPU::op_read(uint24 addr) -> uint8 {
|
|
status.clock_count = speed(addr);
|
|
dma_edge();
|
|
add_clocks(status.clock_count - 4);
|
|
regs.mdr = bus.read(addr, regs.mdr);
|
|
add_clocks(4);
|
|
alu_edge();
|
|
debugger.op_read(addr, regs.mdr);
|
|
return regs.mdr;
|
|
}
|
|
|
|
auto CPU::op_write(uint24 addr, uint8 data) -> void {
|
|
alu_edge();
|
|
status.clock_count = speed(addr);
|
|
dma_edge();
|
|
add_clocks(status.clock_count);
|
|
bus.write(addr, regs.mdr = data);
|
|
debugger.op_write(addr, regs.mdr);
|
|
}
|
|
|
|
auto CPU::speed(uint24 addr) const -> uint {
|
|
if(addr & 0x408000) {
|
|
if(addr & 0x800000) return status.rom_speed;
|
|
return 8;
|
|
}
|
|
if((addr + 0x6000) & 0x4000) return 8;
|
|
if((addr - 0x4000) & 0x7e00) return 6;
|
|
return 12;
|
|
}
|
|
|
|
auto CPU::disassembler_read(uint24 addr) -> uint8 {
|
|
return bus.read(addr, regs.mdr);
|
|
}
|