MSXFDC.cc

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#include "MSXFDC.hh"
#include "RealDrive.hh"
#include "Rom.hh"
#include "XMLElement.hh"
#include "MSXException.hh"
#include "serialize.hh"
#include <memory>

namespace openmsx {

MSXFDC::MSXFDC(const DeviceConfig& config, const std::string& romId, bool needROM)
        : MSXDevice(config)
        , rom(needROM
                ? std::make_unique<Rom>(getName() + " ROM", "rom", config, romId)
                : nullptr) // e.g. Spectravideo_SVI-328 doesn't have a diskrom
{
        if (needROM && (rom->getSize() == 0)) {
                throw MSXException(
                        "Empty ROM not allowed for \"", getName(), "\".");
        }
        bool singleSided = config.findChild("singlesided") != nullptr;
        int numDrives = config.getChildDataAsInt("drives", 1);
        if ((0 > numDrives) || (numDrives >= 4)) {
                throw MSXException("Invalid number of drives: ", numDrives);
        }
        unsigned timeout = config.getChildDataAsInt("motor_off_timeout_ms", 0);
        const XMLElement* styleEl = config.findChild("connectionstyle");
        bool signalsNeedMotorOn = !styleEl || (styleEl->getData() == "Philips");
        EmuDuration motorTimeout = EmuDuration::msec(timeout);
        int i = 0;
        for ( ; i < numDrives; ++i) {
                drives[i] = std::make_unique<RealDrive>(
                        getMotherBoard(), motorTimeout, signalsNeedMotorOn,
                        !singleSided);
        }
        for ( ; i < 4; ++i) {
                drives[i] = std::make_unique<DummyDrive>();
        }
}

MSXFDC::~MSXFDC() = default;

void MSXFDC::powerDown(EmuTime::param time)
{
        for (auto& drive : drives) {
                drive->setMotor(false, time);
        }
}

byte MSXFDC::readMem(word address, EmuTime::param /*time*/)
{
        return *MSXFDC::getReadCacheLine(address);
}

byte MSXFDC::peekMem(word address, EmuTime::param /*time*/) const
{
        return *MSXFDC::getReadCacheLine(address);
}

const byte* MSXFDC::getReadCacheLine(word start) const
{
        return &(*rom)[start & 0x3FFF];
}


template<typename Archive>
void MSXFDC::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);

        // Drives are already constructed at this point, so we cannot use the
        // polymorphic object construction of the serialization framework.
        // Destroying and reconstructing the drives is not an option because
        // DriveMultiplexer already has pointers to the drives.
        char tag[7] = { 'd', 'r', 'i', 'v', 'e', 'X', 0 };
        for (int i = 0; i < 4; ++i) {
                if (auto drive = dynamic_cast<RealDrive*>(drives[i].get())) {
                        tag[5] = char('a' + i);
                        ar.serialize(tag, *drive);
                }
        }
}
INSTANTIATE_SERIALIZE_METHODS(MSXFDC);

} // namespace openmsx