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Cart: Added support for ExHiROM boards

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This commit is contained in:
Sour 2019-04-03 19:22:34 -04:00
parent 9c46823522
commit 08cdaffeb1
2 changed files with 26 additions and 11 deletions
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35
Core/BaseCartridge.cpp
View file

@ -33,6 +33,10 @@ shared_ptr<BaseCartridge> BaseCartridge::CreateCartridge(VirtualFile &romFile, V
vector<uint8_t> romData;
romFile.ReadFile(romData);
if(romData.size() < 0x8000) {
return nullptr;
}
cart->_romPath = romFile;
cart->_prgRomSize = (uint32_t)romData.size();
cart->_prgRom = new uint8_t[cart->_prgRomSize];
@ -103,33 +107,34 @@ int32_t BaseCartridge::GetHeaderScore(uint32_t addr)
void BaseCartridge::Init()
{
//Find the best potential header among lorom/hirom + headerless/headered combinations
vector<uint32_t> baseAddresses = { 0, 0x200, 0x8000, 0x8200 };
vector<uint32_t> baseAddresses = { 0, 0x200, 0x8000, 0x8200, 0x408000, 0x408200 };
int32_t bestScore = -1;
bool hasHeader = false;
bool isLoRom = true;
bool isExRom = true;
uint32_t headerOffset = 0;
for(uint32_t baseAddress : baseAddresses) {
int32_t score = GetHeaderScore(baseAddress);
if(score > bestScore) {
if(score >= 0 && score >= bestScore) {
bestScore = score;
isLoRom = (baseAddress & 0x8000) == 0;
isExRom = (baseAddress & 0x400000) != 0;
hasHeader = (baseAddress & 0x200) != 0;
headerOffset = std::min(baseAddress + 0x7FB0, _prgRomSize - 0x40);
}
}
uint32_t headerOffset = 0;
uint32_t flags = 0;
if(isLoRom) {
if(hasHeader) {
flags |= CartFlags::CopierHeader;
}
flags |= CartFlags::LoRom;
headerOffset = 0x7FB0;
} else {
if(hasHeader) {
flags |= CartFlags::CopierHeader;
}
flags |= CartFlags::HiRom;
headerOffset = 0xFFB0;
flags |= isExRom ? CartFlags::ExHiRom : CartFlags::HiRom;
}
if(flags & CartFlags::CopierHeader) {
@ -198,13 +203,13 @@ void BaseCartridge::SaveBattery()
}
}
void BaseCartridge::MapBanks(MemoryManager &mm, vector<unique_ptr<IMemoryHandler>> &handlers, uint8_t startBank, uint8_t endBank, uint16_t startPage, uint16_t endPage, uint16_t pageIncrement, bool mirror)
void BaseCartridge::MapBanks(MemoryManager &mm, vector<unique_ptr<IMemoryHandler>> &handlers, uint8_t startBank, uint8_t endBank, uint16_t startPage, uint16_t endPage, uint16_t pageIncrement, bool mirror, uint16_t startPageNumber)
{
if(handlers.empty()) {
return;
}
uint32_t pageNumber = 0;
uint32_t pageNumber = startPageNumber;
for(uint32_t i = startBank; i <= endBank; i++) {
uint32_t baseAddress = i << 16;
pageNumber += pageIncrement;
@ -230,7 +235,7 @@ void BaseCartridge::RegisterHandlers(MemoryManager &mm)
}
uint32_t power = (uint32_t)std::log2(_prgRomSize);
if(_prgRomSize > (1 << power)) {
if(_prgRomSize > (1u << power)) {
//If size isn't a power of 2, mirror the part above the nearest (lower) power of 2 until the size reaches the next power of 2.
uint32_t halfSize = 1 << power;
uint32_t fullSize = 1 << (power + 1);
@ -254,7 +259,7 @@ void BaseCartridge::RegisterHandlers(MemoryManager &mm)
MapBanks(mm, _saveRamHandlers, 0x70, 0x7D, 0x00, 0x07, 0, true);
MapBanks(mm, _saveRamHandlers, 0xF0, 0xFF, 0x00, 0x07, 0, true);
}
} else {
} else if(_flags & CartFlags::HiRom) {
MapBanks(mm, _prgRomHandlers, 0x00, 0x3F, 0x08, 0x0F, 8, true);
MapBanks(mm, _prgRomHandlers, 0x40, 0x7D, 0x00, 0x0F, 0, true);
MapBanks(mm, _prgRomHandlers, 0x80, 0xBF, 0x08, 0x0F, 8, true);
@ -262,6 +267,16 @@ void BaseCartridge::RegisterHandlers(MemoryManager &mm)
MapBanks(mm, _saveRamHandlers, 0x20, 0x3F, 0x06, 0x07, 0, true);
MapBanks(mm, _saveRamHandlers, 0xA0, 0xBF, 0x06, 0x07, 0, true);
} else if(_flags & CartFlags::ExHiRom) {
//First half is at the end
MapBanks(mm, _prgRomHandlers, 0xC0, 0xFF, 0x00, 0x0F, 0, true);
MapBanks(mm, _prgRomHandlers, 0x80, 0xBF, 0x08, 0x0F, 8, true); //mirror
//Last part of the ROM is at the start
MapBanks(mm, _prgRomHandlers, 0x40, 0x7D, 0x00, 0x0F, 0, true, 0x400);
MapBanks(mm, _prgRomHandlers, 0x00, 0x3F, 0x08, 0x0F, 8, true, 0x400); //mirror
MapBanks(mm, _saveRamHandlers, 0x80, 0xBF, 0x06, 0x07, 0, true);
}
}

2
Core/BaseCartridge.h
View file

@ -37,7 +37,7 @@ private:
uint32_t _prgRomSize = 0;
uint32_t _saveRamSize = 0;
void MapBanks(MemoryManager &mm, vector<unique_ptr<IMemoryHandler>> &handlers, uint8_t startBank, uint8_t endBank, uint16_t startPage = 0, uint16_t endPage = 0x0F, uint16_t pageIncrement = 0, bool mirror = false);
void MapBanks(MemoryManager &mm, vector<unique_ptr<IMemoryHandler>> &handlers, uint8_t startBank, uint8_t endBank, uint16_t startPage = 0, uint16_t endPage = 0x0F, uint16_t pageIncrement = 0, bool mirror = false, uint16_t startPageNumber = 0);
void LoadBattery();