84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
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#include "stdafx.h"
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#include "MemoryManager.h"
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uint8_t MemoryManager::ReadRegister(uint16_t addr)
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{
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if(_registerHandlers[addr]) {
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return _registerHandlers[addr]->MemoryRead(addr);
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} else {
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return 0;
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}
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}
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void MemoryManager::WriteRegister(uint16_t addr, uint8_t value)
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{
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if(_registerHandlers[addr]) {
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_registerHandlers[addr]->MemoryWrite(addr, value);
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}
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}
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MemoryManager::MemoryManager()
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{
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_internalRAM = new uint8_t[InternalRAMSize];
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_SRAM = new uint8_t[SRAMSize];
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ZeroMemory(_SRAM, SRAMSize);
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ZeroMemory(_internalRAM, InternalRAMSize);
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for(int i = 0; i < 0xFFFF; i++) {
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_registerHandlers.push_back(nullptr);
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}
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}
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MemoryManager::~MemoryManager()
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{
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delete[] _internalRAM;
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delete[] _SRAM;
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}
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void MemoryManager::RegisterIODevice(IMemoryHandler *handler)
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{
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std::array<int, 2> addresses = handler->GetIOAddresses();
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for(int i = addresses[0]; i < addresses[1]; i++) {
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_registerHandlers[i] = handler;
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}
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}
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uint8_t MemoryManager::Read(uint16_t addr)
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{
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if(addr <= 0x1FFF) {
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return _internalRAM[addr & 0x07FF];
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} else if(addr <= 0x401F) {
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return ReadRegister(addr);
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} else if(addr <= 0x5FFF) {
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throw std::exception("Not implemented yet");
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//return ReadExpansionROM();
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} else if(addr <= 0x7FFF) {
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return _SRAM[addr];
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} else {
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return ReadRegister(addr);
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}
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}
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void MemoryManager::Write(uint16_t addr, uint8_t value)
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{
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if(addr <= 0x1FFFF) {
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_internalRAM[addr & 0x07FF] = value;
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} else if(addr <= 0x401F) {
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WriteRegister(addr, value);
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} else if(addr <= 0x5FFF) {
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throw std::exception("Not implemented yet");
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//return ReadExpansionROM();
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} else if(addr <= 0x7FFF) {
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_SRAM[addr] = value;
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} else {
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WriteRegister(addr, value);
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}
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}
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uint16_t MemoryManager::ReadWord(uint16_t addr)
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{
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uint8_t lo = Read(addr);
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uint8_t hi = Read(addr+1);
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return lo | hi << 8;
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}
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