mirror of https://github.com/bsnes-emu/bsnes.git
133 lines
2.3 KiB
C++
133 lines
2.3 KiB
C++
#include <sfc/sfc.hpp>
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namespace SuperFamicom {
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#include "memory.cpp"
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#include "serialization.cpp"
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ArmDSP armdsp;
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ArmDSP::ArmDSP() {
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programROM = new uint8[128 * 1024];
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dataROM = new uint8[32 * 1024];
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programRAM = new uint8[16 * 1024];
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}
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ArmDSP::~ArmDSP() {
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delete[] programROM;
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delete[] dataROM;
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delete[] programRAM;
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}
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auto ArmDSP::Enter() -> void {
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armdsp.boot();
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while(true) scheduler.synchronize(), armdsp.main();
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}
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auto ArmDSP::boot() -> void {
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//reset hold delay
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while(bridge.reset) {
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step(1);
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continue;
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}
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//reset sequence delay
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if(bridge.ready == false) {
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step(65'536);
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bridge.ready = true;
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}
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}
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auto ArmDSP::main() -> void {
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if(crash) {
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print(disassembleRegisters(), "\n");
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print(disassembleInstructionARM(pipeline.execute.address), "\n");
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print("Executed: ", instructions, "\n");
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while(true) step(frequency);
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}
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stepARM();
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}
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auto ArmDSP::step(uint clocks) -> void {
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if(bridge.timer && --bridge.timer == 0);
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Cothread::step(clocks);
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synchronizeCPU();
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}
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//MMIO: 00-3f,80-bf:3800-38ff
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//3800-3807 mirrored throughout
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//a0 ignored
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auto ArmDSP::read(uint24 addr, uint8) -> uint8 {
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cpu.synchronizeCoprocessors();
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uint8 data = 0x00;
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addr &= 0xff06;
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if(addr == 0x3800) {
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if(bridge.armtocpu.ready) {
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bridge.armtocpu.ready = false;
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data = bridge.armtocpu.data;
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}
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}
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if(addr == 0x3802) {
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bridge.signal = false;
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}
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if(addr == 0x3804) {
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data = bridge.status();
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}
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return data;
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}
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auto ArmDSP::write(uint24 addr, uint8 data) -> void {
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cpu.synchronizeCoprocessors();
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addr &= 0xff06;
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if(addr == 0x3802) {
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bridge.cputoarm.ready = true;
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bridge.cputoarm.data = data;
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}
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if(addr == 0x3804) {
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data &= 1;
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if(!bridge.reset && data) resetARM();
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bridge.reset = data;
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}
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}
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auto ArmDSP::init() -> void {
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}
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auto ArmDSP::load() -> void {
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}
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auto ArmDSP::unload() -> void {
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}
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auto ArmDSP::power() -> void {
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for(auto n : range(16 * 1024)) programRAM[n] = random(0x00);
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}
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auto ArmDSP::reset() -> void {
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bridge.reset = false;
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resetARM();
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}
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auto ArmDSP::resetARM() -> void {
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create(ArmDSP::Enter, 21'477'272);
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ARM::power();
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bridge.ready = false;
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bridge.signal = false;
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bridge.timer = 0;
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bridge.timerlatch = 0;
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bridge.cputoarm.ready = false;
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bridge.armtocpu.ready = false;
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}
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}
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