mirror of https://github.com/bsnes-emu/bsnes.git
93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
//Memory
|
|
|
|
auto Memory::size() const -> uint { return 0; }
|
|
|
|
//StaticRAM
|
|
|
|
StaticRAM::StaticRAM(uint n) : size_(n) { data_ = new uint8[size_]; }
|
|
StaticRAM::~StaticRAM() { delete[] data_; }
|
|
|
|
auto StaticRAM::data() -> uint8* { return data_; }
|
|
auto StaticRAM::size() const -> uint { return size_; }
|
|
|
|
auto StaticRAM::read(uint24 addr, uint8) -> uint8 { return data_[addr]; }
|
|
auto StaticRAM::write(uint24 addr, uint8 data) -> void { data_[addr] = data; }
|
|
auto StaticRAM::operator[](uint24 addr) -> uint8& { return data_[addr]; }
|
|
auto StaticRAM::operator[](uint24 addr) const -> const uint8& { return data_[addr]; }
|
|
|
|
//MappedRAM
|
|
|
|
auto MappedRAM::reset() -> void {
|
|
if(data_) {
|
|
delete[] data_;
|
|
data_ = nullptr;
|
|
}
|
|
size_ = 0;
|
|
write_protect_ = false;
|
|
}
|
|
|
|
auto MappedRAM::map(uint8* source, uint length) -> void {
|
|
reset();
|
|
data_ = source;
|
|
size_ = data_ ? length : 0;
|
|
}
|
|
|
|
auto MappedRAM::copy(const stream& memory) -> void {
|
|
if(data_) delete[] data_;
|
|
//round size up to multiple of 256-bytes
|
|
size_ = (memory.size() & ~255) + ((bool)(memory.size() & 255) << 8);
|
|
data_ = new uint8[size_]();
|
|
memory.read((uint8_t*)data_, memory.size());
|
|
}
|
|
|
|
auto MappedRAM::read(const stream& memory) -> void {
|
|
memory.read((uint8_t*)data_, min(memory.size(), size_));
|
|
}
|
|
|
|
auto MappedRAM::write_protect(bool status) -> void { write_protect_ = status; }
|
|
auto MappedRAM::data() -> uint8* { return data_; }
|
|
auto MappedRAM::size() const -> uint { return size_; }
|
|
|
|
auto MappedRAM::read(uint24 addr, uint8) -> uint8 { return data_[addr]; }
|
|
auto MappedRAM::write(uint24 addr, uint8 data) -> void { if(!write_protect_) data_[addr] = data; }
|
|
auto MappedRAM::operator[](uint24 addr) const -> const uint8& { return data_[addr]; }
|
|
|
|
//Bus
|
|
|
|
auto Bus::mirror(uint addr, uint size) -> uint {
|
|
if(size == 0) return 0;
|
|
uint base = 0;
|
|
uint mask = 1 << 23;
|
|
while(addr >= size) {
|
|
while(!(addr & mask)) mask >>= 1;
|
|
addr -= mask;
|
|
if(size > mask) {
|
|
size -= mask;
|
|
base += mask;
|
|
}
|
|
mask >>= 1;
|
|
}
|
|
return base + addr;
|
|
}
|
|
|
|
auto Bus::reduce(uint addr, uint mask) -> uint {
|
|
while(mask) {
|
|
uint bits = (mask & -mask) - 1;
|
|
addr = ((addr >> 1) & ~bits) | (addr & bits);
|
|
mask = (mask & (mask - 1)) >> 1;
|
|
}
|
|
return addr;
|
|
}
|
|
|
|
auto Bus::read(uint24 addr, uint8 data) -> uint8 {
|
|
data = reader[lookup[addr]](target[addr], data);
|
|
if(cheat.enable()) {
|
|
if(auto result = cheat.find(addr, data)) return result();
|
|
}
|
|
return data;
|
|
}
|
|
|
|
auto Bus::write(uint24 addr, uint8 data) -> void {
|
|
return writer[lookup[addr]](target[addr], data);
|
|
}
|