mirror of https://github.com/bsnes-emu/bsnes.git
103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
#include <sfc/sfc.hpp>
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namespace SuperFamicom {
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CPU cpu;
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#include "dma.cpp"
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#include "memory.cpp"
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#include "io.cpp"
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#include "timing.cpp"
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#include "irq.cpp"
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#include "serialization.cpp"
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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(r.wai) return instructionWait();
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if(r.stp) return instructionStop();
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if(status.interruptPending) {
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status.interruptPending = false;
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if(status.nmiPending) {
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status.nmiPending = false;
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r.vector = r.e ? 0xfffa : 0xffea;
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interrupt();
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} else if(status.irqPending) {
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status.irqPending = false;
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r.vector = r.e ? 0xfffe : 0xffee;
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interrupt();
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} else if(status.resetPending) {
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status.resetPending = false;
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step(132);
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r.vector = 0xfffc;
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interrupt();
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} else if(status.powerPending) {
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status.powerPending = false;
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step(186);
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r.pc.byte(0) = bus.read(0xfffc, r.mdr);
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r.pc.byte(1) = bus.read(0xfffd, r.mdr);
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}
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}
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instruction();
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}
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auto CPU::load() -> bool {
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version = configuration.system.cpu.version;
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if(version < 1) version = 1;
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if(version > 2) version = 2;
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return true;
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}
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auto CPU::power(bool reset) -> void {
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WDC65816::power();
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create(Enter, system.cpuFrequency());
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coprocessors.reset();
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PPUcounter::reset();
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PPUcounter::scanline = {&CPU::scanline, this};
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function<auto (uint24, uint8) -> uint8> reader;
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function<auto (uint24, uint8) -> void> writer;
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reader = {&CPU::readRAM, this};
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writer = {&CPU::writeRAM, this};
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bus.map(reader, writer, "00-3f,80-bf:0000-1fff", 0x2000);
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bus.map(reader, writer, "7e-7f:0000-ffff", 0x20000);
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reader = {&CPU::readAPU, this};
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writer = {&CPU::writeAPU, this};
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bus.map(reader, writer, "00-3f,80-bf:2140-217f");
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reader = {&CPU::readCPU, this};
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writer = {&CPU::writeCPU, this};
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bus.map(reader, writer, "00-3f,80-bf:2180-2183,4016-4017,4200-421f");
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reader = {&CPU::readDMA, this};
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writer = {&CPU::writeDMA, this};
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bus.map(reader, writer, "00-3f,80-bf:4300-437f");
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if(!reset) random.array(wram, sizeof(wram));
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for(uint n : range(8)) {
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channels[n] = {};
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if(n != 7) channels[n].next = channels[n + 1];
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}
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counter = {};
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io = {};
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alu = {};
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status = {};
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status.lineClocks = lineclocks();
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status.dramRefreshPosition = (version == 1 ? 530 : 538);
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status.hdmaSetupPosition = (version == 1 ? 12 + 8 - dmaCounter() : 12 + dmaCounter());
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status.hdmaPosition = 1104;
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status.powerPending = reset == 0;
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status.resetPending = reset == 1;
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status.interruptPending = true;
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}
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}
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