mirror of https://github.com/bsnes-emu/bsnes.git
102 lines
2.0 KiB
C++
102 lines
2.0 KiB
C++
#include <fc/fc.hpp>
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namespace Famicom {
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#include "timing.cpp"
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#include "serialization.cpp"
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CPU cpu;
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auto CPU::Enter() -> void {
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while(true) scheduler.synchronize(), cpu.main();
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}
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auto CPU::main() -> void {
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if(status.interrupt_pending) return interrupt();
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exec();
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}
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auto CPU::add_clocks(uint clocks) -> void {
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apu.clock -= clocks;
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if(apu.clock < 0 && !scheduler.synchronizing()) co_switch(apu.thread);
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ppu.clock -= clocks;
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if(ppu.clock < 0 && !scheduler.synchronizing()) co_switch(ppu.thread);
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cartridge.clock -= clocks;
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if(cartridge.clock < 0 && !scheduler.synchronizing()) co_switch(cartridge.thread);
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}
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auto CPU::power() -> void {
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R6502::power();
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for(auto addr : range(0x0800)) ram[addr] = 0xff;
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ram[0x0008] = 0xf7;
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ram[0x0009] = 0xef;
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ram[0x000a] = 0xdf;
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ram[0x000f] = 0xbf;
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}
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auto CPU::reset() -> void {
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R6502::reset();
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create(CPU::Enter, 21'477'272);
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regs.pc = bus.read(0xfffc) << 0;
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regs.pc |= bus.read(0xfffd) << 8;
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status.interrupt_pending = false;
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status.nmi_pending = false;
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status.nmi_line = 0;
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status.irq_line = 0;
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status.irq_apu_line = 0;
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status.rdy_line = 1;
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status.rdy_addr_valid = false;
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status.rdy_addr_value = 0x0000;
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status.oam_dma_pending = false;
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status.oam_dma_page = 0x00;
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status.controller_latch = false;
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status.controller_port0 = 0;
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status.controller_port1 = 0;
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}
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auto CPU::debugger_read(uint16 addr) -> uint8 {
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return bus.read(addr);
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}
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auto CPU::ram_read(uint16 addr) -> uint8 {
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return ram[addr & 0x07ff];
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}
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auto CPU::ram_write(uint16 addr, uint8 data) -> void {
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ram[addr & 0x07ff] = data;
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}
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auto CPU::read(uint16 addr) -> uint8 {
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if(addr == 0x4016) {
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return (mdr() & 0xc0) | input.data(0);
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}
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if(addr == 0x4017) {
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return (mdr() & 0xc0) | input.data(1);
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}
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return apu.read(addr);
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}
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auto CPU::write(uint16 addr, uint8 data) -> void {
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if(addr == 0x4014) {
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status.oam_dma_page = data;
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status.oam_dma_pending = true;
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}
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if(addr == 0x4016) {
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input.latch(data & 0x01);
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}
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return apu.write(addr, data);
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}
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}
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