mirror of https://github.com/bsnes-emu/bsnes.git
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
//Memory
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auto Memory::size() const -> uint { return 0; }
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//StaticRAM
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StaticRAM::StaticRAM(uint n) : size_(n) { data_ = new uint8[size_]; }
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StaticRAM::~StaticRAM() { delete[] data_; }
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auto StaticRAM::data() -> uint8* { return data_; }
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auto StaticRAM::size() const -> uint { return size_; }
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auto StaticRAM::read(uint addr, uint8) -> uint8 { return data_[addr]; }
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auto StaticRAM::write(uint addr, uint8 data) -> void { data_[addr] = data; }
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auto StaticRAM::operator[](uint addr) -> uint8& { return data_[addr]; }
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auto StaticRAM::operator[](uint addr) const -> const uint8& { return data_[addr]; }
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//MappedRAM
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auto MappedRAM::reset() -> void {
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if(data_) {
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delete[] data_;
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data_ = nullptr;
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}
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size_ = 0;
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write_protect_ = false;
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}
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auto MappedRAM::map(uint8* source, uint length) -> void {
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reset();
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data_ = source;
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size_ = data_ ? length : 0;
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}
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auto MappedRAM::copy(const stream& memory) -> void {
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if(data_) delete[] data_;
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//round size up to multiple of 256-bytes
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size_ = (memory.size() & ~255) + ((bool)(memory.size() & 255) << 8);
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data_ = new uint8[size_]();
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memory.read(data_, memory.size());
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}
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auto MappedRAM::read(const stream& memory) -> void {
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memory.read(data_, min(memory.size(), size_));
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}
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auto MappedRAM::write_protect(bool status) -> void { write_protect_ = status; }
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auto MappedRAM::data() -> uint8* { return data_; }
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auto MappedRAM::size() const -> uint { return size_; }
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auto MappedRAM::read(uint addr, uint8) -> uint8 { return data_[addr]; }
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auto MappedRAM::write(uint addr, uint8 data) -> void { if(!write_protect_) data_[addr] = data; }
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auto MappedRAM::operator[](uint addr) const -> const uint8& { return data_[addr]; }
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//Bus
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auto Bus::mirror(uint addr, uint size) -> uint {
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if(size == 0) return 0;
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uint base = 0;
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uint mask = 1 << 23;
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while(addr >= size) {
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while(!(addr & mask)) mask >>= 1;
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addr -= mask;
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if(size > mask) {
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size -= mask;
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base += mask;
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}
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mask >>= 1;
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}
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return base + addr;
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}
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auto Bus::reduce(uint addr, uint mask) -> uint {
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while(mask) {
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uint bits = (mask & -mask) - 1;
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addr = ((addr >> 1) & ~bits) | (addr & bits);
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mask = (mask & (mask - 1)) >> 1;
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}
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return addr;
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}
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auto Bus::read(uint addr, uint8 data) -> uint8 {
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data = reader[lookup[addr]](target[addr], data);
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if(cheat.enable()) {
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if(auto result = cheat.find(addr, data)) return result();
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}
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return data;
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}
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auto Bus::write(uint addr, uint8 data) -> void {
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return writer[lookup[addr]](target[addr], data);
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}
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