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◆ main openmsx / src / memory / MSXMirrorDevice.cc
1.6 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MSXMirrorDevice.hh"
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#include "MSXCPUInterface.hh"
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#include "MSXException.hh"
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#include "serialize.hh"
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namespace openmsx {
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[[nodiscard]] static unsigned getAddressHigh(const DeviceConfig& config)
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{
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	unsigned prim = config.getChildDataAsInt("ps", 0);
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	unsigned sec  = config.getChildDataAsInt("ss", 0);
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	if ((prim >= 4) || (sec >= 4)) {
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		throw MSXException("Invalid slot in mirror device.");
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	}
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	return (prim << 18) | (sec << 16);
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}
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MSXMirrorDevice::MSXMirrorDevice(const DeviceConfig& config)
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	: MSXDevice(config)
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	, interface(getCPUInterface()) // frequently used, so cache
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	, addressHigh(getAddressHigh(config))
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{
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}
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byte MSXMirrorDevice::peekMem(uint16_t address, EmuTime time) const
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{
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	return interface.peekSlottedMem(addressHigh | address, time);
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}
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byte MSXMirrorDevice::readMem(uint16_t address, EmuTime time)
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{
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	return interface.readSlottedMem(addressHigh | address, time);
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}
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void MSXMirrorDevice::writeMem(uint16_t address, byte value, EmuTime time)
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{
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	interface.writeSlottedMem(addressHigh | address, value, time);
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}
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const byte* MSXMirrorDevice::getReadCacheLine(uint16_t /*start*/) const
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{
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	return nullptr;
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}
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byte* MSXMirrorDevice::getWriteCacheLine(uint16_t /*start*/)
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{
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	return nullptr;
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}
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bool MSXMirrorDevice::allowUnaligned() const
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{
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	// OK, because this device doesn't call any 'fillDeviceXXXCache()'functions.
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	return true;
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}
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template<typename Archive>
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void MSXMirrorDevice::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXMirrorDevice);
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REGISTER_MSXDEVICE(MSXMirrorDevice, "Mirror");
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} // namespace openmsx