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First stab at implementing MBC1 support for LR35902. Not complete, but all old tests still work.

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon
2017-08-23 23:17:45 +01:00
parent 12c9125e9b
commit 2c7e32aa78
9 changed files with 156 additions and 40 deletions
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src/Memory.cpp
+20 -9
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@@ -8,10 +8,12 @@
EightBit::Memory::Memory(uint16_t addressMask)
: m_addressMask(addressMask),
m_temporary(0) {
m_temporary(0),
m_data(nullptr) {
clear();
m_address.word = 0;
m_data = &(m_bus[m_address.word]);
m_bus.resize(0x10000);
m_locked.resize(0x10000);
}
EightBit::Memory::~Memory() {
@@ -21,6 +23,10 @@ uint8_t EightBit::Memory::peek(uint16_t address) const {
return m_bus[address];
}
void EightBit::Memory::poke(uint16_t address, uint8_t value) {
m_bus[address] = value;
}
uint16_t EightBit::Memory::peekWord(uint16_t address) const {
register16_t returned;
returned.low = peek(address);
@@ -29,8 +35,8 @@ uint16_t EightBit::Memory::peekWord(uint16_t address) const {
}
void EightBit::Memory::clear() {
m_bus.fill(0);
m_locked.fill(false);
std::fill(m_bus.begin(), m_bus.end(), 0);
std::fill(m_locked.begin(), m_locked.end(), false);
}
void EightBit::Memory::loadRom(const std::string& path, uint16_t offset) {
@@ -43,21 +49,26 @@ void EightBit::Memory::loadRam(const std::string& path, uint16_t offset) {
}
int EightBit::Memory::loadMemory(const std::string& path, uint16_t offset) {
return loadBinary(path, m_bus, offset, 0x10000 - offset);
}
int EightBit::Memory::loadBinary(const std::string& path, std::vector<uint8_t>& output, int offset, int maximumSize) {
std::ifstream file;
file.exceptions(std::ios::failbit | std::ios::badbit);
file.open(path, std::ios::binary | std::ios::ate);
auto size = (int)file.tellg();
if ((maximumSize > 0) && (size > maximumSize))
throw std::runtime_error("Binary cannot fit");
size_t extent = size + offset;
if (extent > m_bus.size())
throw std::runtime_error("ROM cannot fit");
if (output.size() < extent)
output.resize(extent);
file.seekg(0, std::ios::beg);
file.read((char*)&m_bus[offset], size);
file.read((char*)&output[offset], size);
file.close();
return size;
}
}