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◆ main openmsx / src / MSXBunsetsu.cc
1.7 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "MSXBunsetsu.hh"
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#include "CacheLine.hh"
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#include "serialize.hh"
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namespace openmsx {
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MSXBunsetsu::MSXBunsetsu(DeviceConfig& config)
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	: MSXDevice(config)
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	, bunsetsuRom(getName() + "_1", "rom", config, "bunsetsu")
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	, jisyoRom   (getName() + "_2", "rom", config, "jisyo")
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{
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	reset(EmuTime::dummy());
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}
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void MSXBunsetsu::reset(EmuTime /*time*/)
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{
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	jisyoAddress = 0;
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}
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byte MSXBunsetsu::readMem(uint16_t address, EmuTime /*time*/)
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{
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	if (address == 0xBFFF) {
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		byte result = jisyoRom[jisyoAddress];
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		jisyoAddress = (jisyoAddress + 1) & 0x1FFFF;
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		return result;
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	} else if ((0x4000 <= address) && (address < 0xC000)) {
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		return bunsetsuRom[address - 0x4000];
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	} else {
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		return 0xFF;
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	}
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}
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void MSXBunsetsu::writeMem(uint16_t address, byte value, EmuTime /*time*/)
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{
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	switch (address) {
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	case 0xBFFC:
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		jisyoAddress = (jisyoAddress & 0x1FF00) | value;
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		break;
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	case 0xBFFD:
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		jisyoAddress = (jisyoAddress & 0x100FF) | (value << 8);
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		break;
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	case 0xBFFE:
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		jisyoAddress = (jisyoAddress & 0x0FFFF) |
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		               ((value & 1) << 16);
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		break;
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	}
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}
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const byte* MSXBunsetsu::getReadCacheLine(uint16_t start) const
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{
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	if ((start & CacheLine::HIGH) == (0xBFFF & CacheLine::HIGH)) {
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		return nullptr;
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	} else {
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		return &bunsetsuRom[start - 0x4000];
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	}
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}
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byte* MSXBunsetsu::getWriteCacheLine(uint16_t start)
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{
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	if ((start & CacheLine::HIGH) == (0xBFFF & CacheLine::HIGH)) {
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		return nullptr;
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	} else {
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		return unmappedWrite.data();
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	}
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}
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template<typename Archive>
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void MSXBunsetsu::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.serialize("jisyoAddress", jisyoAddress);
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXBunsetsu);
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REGISTER_MSXDEVICE(MSXBunsetsu, "Bunsetsu");
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} // namespace openmsx