mirror of https://github.com/bsnes-emu/bsnes.git
110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
#include <md/md.hpp>
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namespace MegaDrive {
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Cartridge cartridge;
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#include "serialization.cpp"
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auto Cartridge::load() -> bool {
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information = {};
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if(auto loaded = platform->load(ID::MegaDrive, "Mega Drive", "md", {"NTSC-J", "NTSC-U", "PAL"})) {
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information.pathID = loaded.pathID();
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information.region = loaded.option();
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} else return false;
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if(auto fp = platform->open(pathID(), "manifest.bml", File::Read, File::Required)) {
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information.manifest = fp->reads();
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} else return false;
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auto document = BML::unserialize(information.manifest);
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information.title = document["information/title"].text();
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if(auto node = document["board/rom"]) {
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rom.size = node["size"].natural();
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rom.mask = bit::round(rom.size) - 1;
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if(rom.size) {
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rom.data = new uint8[rom.mask + 1];
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if(auto name = node["name"].text()) {
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if(auto fp = platform->open(pathID(), name, File::Read, File::Required)) {
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fp->read(rom.data, rom.size);
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}
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}
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}
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}
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if(auto node = document["board/ram"]) {
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ram.size = node["size"].natural();
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ram.mask = bit::round(ram.size) - 1;
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if(ram.size) {
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ram.data = new uint8[ram.mask + 1];
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if(auto name = node["name"].text()) {
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if(auto fp = platform->open(pathID(), name, File::Read)) {
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fp->read(ram.data, ram.size);
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}
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}
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}
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}
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return true;
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}
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auto Cartridge::save() -> void {
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auto document = BML::unserialize(information.manifest);
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if(auto name = document["board/ram/name"].text()) {
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if(auto fp = platform->open(pathID(), name, File::Write)) {
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fp->write(ram.data, ram.size);
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}
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}
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}
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auto Cartridge::unload() -> void {
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delete[] rom.data;
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delete[] ram.data;
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rom = {};
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ram = {};
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}
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auto Cartridge::power() -> void {
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ramEnable = 1;
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ramWritable = 1;
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for(auto n : range(8)) bank[n] = n;
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}
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auto Cartridge::read(uint24 addr) -> uint16 {
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if(addr.bit(21) && ram.size && ramEnable) {
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uint16 data = ram.data[addr + 0 & ram.mask] << 8;
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return data | ram.data[addr + 1 & ram.mask] << 0;
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} else {
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addr = bank[addr >> 19 & 7] << 19 | (addr & 0x7ffff);
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uint16 data = rom.data[addr + 0 & rom.mask] << 8;
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return data | rom.data[addr + 1 & rom.mask] << 0;
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}
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}
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auto Cartridge::write(uint24 addr, uint16 data) -> void {
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//emulating RAM write protect bit breaks some commercial software
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if(addr.bit(21) && ram.size && ramEnable /* && ramWritable */) {
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ram.data[addr + 0 & ram.mask] = data >> 8;
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ram.data[addr + 1 & ram.mask] = data >> 0;
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}
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}
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auto Cartridge::readIO(uint24 addr) -> uint16 {
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return 0x0000;
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}
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auto Cartridge::writeIO(uint24 addr, uint16 data) -> void {
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if(addr == 0xa130f1) ramEnable = data.bit(0), ramWritable = data.bit(1);
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if(addr == 0xa130f3) bank[1] = data;
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if(addr == 0xa130f5) bank[2] = data;
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if(addr == 0xa130f7) bank[3] = data;
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if(addr == 0xa130f9) bank[4] = data;
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if(addr == 0xa130fb) bank[5] = data;
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if(addr == 0xa130fd) bank[6] = data;
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if(addr == 0xa130ff) bank[7] = data;
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}
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}
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