OXYGENHUB
◆ main openmsx / src / memory / RomNeo16.cc
1.2 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "RomNeo16.hh"
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#include "serialize.hh"
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#include "xrange.hh"
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namespace openmsx {
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RomNeo16::RomNeo16(const DeviceConfig& config, Rom&& rom_)
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	: Rom16kBBlocks(config, std::move(rom_))
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{
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	reset(EmuTime::dummy());
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}
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void RomNeo16::reset(EmuTime /*time*/)
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{
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	for (auto i : xrange(3)) {
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		setRom(i, 0);
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		blockReg[i] = 0;
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	}
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	setUnmapped(3);
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}
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void RomNeo16::writeMem(uint16_t address, byte value, EmuTime /*time*/)
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{
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	unsigned bbb = (address >> 11) & 0b111;
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	if ((bbb < 2) || (bbb & 1)) return;
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	unsigned region = (bbb >> 1) - 1;
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	if ((address & 1) == 0) {
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		blockReg[region] = uint16_t((blockReg[region] & 0xFF00) | value);
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	} else {
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		blockReg[region] = uint16_t((blockReg[region] & 0x00FF) | ((value & 0b1111) << 8));
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	}
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	setRom(region, blockReg[region]);
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}
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byte* RomNeo16::getWriteCacheLine(uint16_t address)
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{
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	unsigned bbb = (address >> 11) & 0b111;
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	return ((bbb < 2) || (bbb & 1)) ? unmappedWrite.data() : nullptr;
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}
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template<typename Archive>
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void RomNeo16::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<Rom16kBBlocks>(*this);
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	ar.serialize("blockReg", blockReg);
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}
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REGISTER_MSXDEVICE(RomNeo16, "RomNeo16");
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} // namespace openmsx