mirror of
https://github.com/zoriya/ComSquare.git
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99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
//
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// Created by anonymus-raccoon on 1/23/20.
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//
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#include <algorithm>
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#include <iostream>
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#include "MemoryBus.hpp"
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#include "../SNES.hpp"
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#include "MemoryShadow.hpp"
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#include "RectangleShadow.hpp"
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namespace ComSquare::Memory
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{
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std::shared_ptr<IMemory> MemoryBus::getAccessor(uint24_t addr)
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{
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auto it = std::find_if(this->_memoryAccessors.begin(), this->_memoryAccessors.end(), [addr](std::shared_ptr<IMemory> &accessor)
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{
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// std::cout << "Accessor: " << std::hex << accessor->getStart() << " Has access:: " << accessor->hasMemoryAt(addr) << std::endl;
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return accessor->hasMemoryAt(addr);
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});
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if (it == this->_memoryAccessors.end())
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return nullptr;
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return *it;
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}
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uint8_t MemoryBus::read(uint24_t addr)
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{
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std::shared_ptr<IMemory> handler = this->getAccessor(addr);
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if (!handler) {
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std::cout << "Unknown memory accessor for address " << std::hex << addr << ". Using open bus." << std::endl;
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return this->_openBus;
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}
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uint8_t data = handler->read(addr - handler->getStart());
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this->_openBus = data;
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return data;
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}
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void MemoryBus::write(uint24_t addr, uint8_t data)
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{
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std::shared_ptr<IMemory> handler = this->getAccessor(addr);
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if (!handler) {
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std::cout << "Unknown memory accessor for address " << std::hex << addr << ". Warning, it was a write." << std::endl;
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return;
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}
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handler->write(addr - handler->getStart(), data);
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}
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void MemoryBus::_mirrorComponents(SNES &console, int i)
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{
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this->_memoryAccessors.emplace_back(new Memory::MemoryShadow(console.wram, i, i + 0x2000));
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this->_memoryAccessors.emplace_back(new Memory::MemoryShadow(console.ppu, i + 0x2100, i + 0x2140));
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this->_memoryAccessors.emplace_back(new Memory::MemoryShadow(console.apu, i + 0x2140, i + 0x2144));
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this->_memoryAccessors.emplace_back(new Memory::MemoryShadow(console.cpu, i + 0x4200, i + 0x4220));
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}
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void MemoryBus::mapComponents(SNES &console)
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{
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// The WRam and PU registers are always mapped at the same address no matter the mapping mode.
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console.wram->setMemoryRegion(0x7E, 0x7F, 0x0000, 0xFFFF);
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this->_memoryAccessors.push_back(console.wram);
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console.ppu->setMemoryRegion(0x2100, 0x213F);
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this->_memoryAccessors.push_back(console.ppu);
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console.apu->setMemoryRegion(0x2140, 0x2143);
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this->_memoryAccessors.push_back(console.apu);
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console.cpu->setMemoryRegion(0x4200, 0x421F);
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this->_memoryAccessors.push_back(console.cpu);
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// TODO implement DMA & HDMA (4220 to 4300)
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// TODO implement Joys.
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// Mirror to the quarter 1.
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for (uint24_t i = 0; i < 0x400000; i += 0x010000)
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this->_mirrorComponents(console, i);
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// Mirror to the quarter 3.
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for (uint24_t i = 0x800000; i < 0xC00000; i += 0x10000)
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this->_mirrorComponents(console, i);
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if (console.cartridge->header.mappingMode & Cartridge::LoRom) {
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console.cartridge->setMemoryRegion(0x80, 0xFF, 0x8000, 0xFFFF);
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this->_memoryAccessors.push_back(console.cartridge);
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// Mirror on the Q1 and Q2.
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this->_memoryAccessors.emplace_back(new Memory::RectangleShadow(console.cartridge, 0x00, 0x7D, 0x8000, 0xFFFF));
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// Mirror on the lower half of the Q2.
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this->_memoryAccessors.emplace_back((new Memory::RectangleShadow(console.cartridge, 0x40, 0x6F, 0x0000, 0x7FFF))->setBankOffset(0x40));
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// Mirror on the lower half of the Q4
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this->_memoryAccessors.emplace_back((new Memory::RectangleShadow(console.cartridge, 0xC0, 0xF0, 0x0000, 0x7FFF))->setBankOffset(0x40));
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console.sram->setMemoryRegion(0x70, 0x7D, 0x0000, 0x7FFF);
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this->_memoryAccessors.push_back(console.sram);
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this->_memoryAccessors.emplace_back(new Memory::RectangleShadow(console.sram, 0xF0, 0xFD, 0x0000, 0x7FFF));
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}
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// TODO should implement HiRom.
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}
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} |