RomNeo16.cc

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#include "RomNeo16.hh"
#include "serialize.hh"
#include "xrange.hh"
 
namespace openmsx {
 
RomNeo16::RomNeo16(const DeviceConfig& config, Rom&& rom_)
        : Rom16kBBlocks(config, std::move(rom_))
{
        reset(EmuTime::dummy());
}
 
void RomNeo16::reset(EmuTime::param /*time*/)
{
        for (auto i : xrange(3)) {
                setRom(i, 0);
                blockReg[i] = 0;
        }
        setUnmapped(3);
}
 
void RomNeo16::writeMem(word address, byte value, EmuTime::param /*time*/)
{
        unsigned bbb = (address >> 11) & 0b111;
        if ((bbb < 2) || (bbb & 1)) return;
        unsigned region = (bbb >> 1) - 1;
        if ((address & 1) == 0) {
                blockReg[region] = uint16_t((blockReg[region] & 0xFF00) | value);
        } else {
                blockReg[region] = uint16_t((blockReg[region] & 0x00FF) | ((value & 0b1111) << 8));
        }
        setRom(region, blockReg[region]);
}
 
byte* RomNeo16::getWriteCacheLine(word address) const
{
        unsigned bbb = (address >> 11) & 0b111;
        return ((bbb < 2) || (bbb & 1)) ? unmappedWrite.data() : nullptr;
}
 
template<typename Archive>
void RomNeo16::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<Rom16kBBlocks>(*this);
        ar.serialize("blockReg", blockReg);
}
REGISTER_MSXDEVICE(RomNeo16, "RomNeo16");
 
} // namespace openmsx