MSXRam.cc

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#include "MSXRam.hh"
#include "XMLElement.hh"
#include "narrow.hh"
#include "serialize.hh"
#include <cassert>
 
namespace openmsx {
 
MSXRam::MSXRam(const DeviceConfig& config)
        : MSXDevice(config)
{
        // Actual initialization is done in init() because <mem> tags
        // are not yet processed.
}
 
void MSXRam::init()
{
        MSXDevice::init(); // parse mem regions
 
        // by default get base/size from the (union of) the <mem> tag(s)
        getVisibleMemRegion(base, size);
        // but allow to override these two parameters
        base = getDeviceConfig().getChildDataAsInt("base", narrow_cast<int>(base));
        size = getDeviceConfig().getChildDataAsInt("size", narrow_cast<int>(size));
        assert( base         <  0x10000);
        assert((base + size) <= 0x10000);
 
        checkedRam.emplace(getDeviceConfig2(), getName(), "ram", size);
}
 
void MSXRam::powerUp(EmuTime::param /*time*/)
{
        checkedRam->clear();
}
 
unsigned MSXRam::translate(unsigned address) const
{
        address -= base;
        if (address >= size) address &= (size - 1);
        return address;
}
 
byte MSXRam::peekMem(word address, EmuTime::param /*time*/) const
{
        return checkedRam->peek(translate(address));
}
 
byte MSXRam::readMem(word address, EmuTime::param /*time*/)
{
        return checkedRam->read(translate(address));
}
 
void MSXRam::writeMem(word address, byte value, EmuTime::param /*time*/)
{
        checkedRam->write(translate(address), value);
}
 
const byte* MSXRam::getReadCacheLine(word start) const
{
        return checkedRam->getReadCacheLine(translate(start));
}
 
byte* MSXRam::getWriteCacheLine(word start)
{
        return checkedRam->getWriteCacheLine(translate(start));
}
 
template<typename Archive>
void MSXRam::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);
        // TODO ar.serialize("checkedRam", checkedRam);
        ar.serialize("ram", checkedRam->getUncheckedRam());
}
INSTANTIATE_SERIALIZE_METHODS(MSXRam);
REGISTER_MSXDEVICE(MSXRam, "Ram");
 
} // namespace openmsx