IDEHD.cc

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#include "IDEHD.hh"
#include "MSXException.hh"
#include "DeviceConfig.hh"
#include "MSXMotherBoard.hh"
#include "Reactor.hh"
#include "DiskManipulator.hh"
#include "endian.hh"
#include "narrow.hh"
#include "serialize.hh"
#include "strCat.hh"
#include "xrange.hh"
#include <cassert>
 
namespace openmsx {
 
IDEHD::IDEHD(const DeviceConfig& config)
        : HD(config)
        , AbstractIDEDevice(config.getMotherBoard())
        , diskManipulator(config.getReactor().getDiskManipulator())
        , devName(config.getChildData("name", "openMSX hard disk"))
{
        diskManipulator.registerDrive(
                *this, tmpStrCat(config.getMotherBoard().getMachineID(), "::"));
}
 
IDEHD::~IDEHD()
{
        diskManipulator.unregisterDrive(*this);
}
 
bool IDEHD::isPacketDevice()
{
        return false;
}
 
std::string_view IDEHD::getDeviceName()
{
        return devName;
}
 
void IDEHD::fillIdentifyBlock(AlignedBuffer& buf)
{
        auto totalSectors = getNbSectors();
        const uint16_t heads = 16;
        const uint16_t sectors = 32;
        auto cylinders = narrow<uint16_t>(totalSectors / size_t(heads * sectors));
        Endian::writeL16(&buf[1 * 2], cylinders);
        Endian::writeL16(&buf[3 * 2], heads);
        Endian::writeL16(&buf[6 * 2], sectors);
 
        buf[47 * 2 + 0] = 16; // max sector transfer per interrupt
        buf[47 * 2 + 1] = 0x80; // specced value
 
        // .... 1...: IORDY supported (hardware signal used by PIO modes >3)
        // .... ..1.: LBA supported
        buf[49 * 2 + 1] = 0x0A;
 
        // TODO check for overflow
        Endian::writeL32(&buf[60 * 2], unsigned(totalSectors));
}
 
unsigned IDEHD::readBlockStart(AlignedBuffer& buf, unsigned count)
{
        try {
                assert(count >= 512);
                (void)count; // avoid warning
                readSector(transferSectorNumber,
                           *aligned_cast<SectorBuffer*>(buf));
                ++transferSectorNumber;
                return 512;
        } catch (MSXException&) {
                abortReadTransfer(UNC);
                return 0;
        }
}
 
void IDEHD::writeBlockComplete(AlignedBuffer& buf, unsigned count)
{
        try {
                assert((count % 512) == 0);
                size_t num = count / 512;
                for (auto i : xrange(num)) {
                        writeSector(transferSectorNumber++,
                                    *aligned_cast<SectorBuffer*>(buf + 512 * i));
                }
        } catch (MSXException&) {
                abortWriteTransfer(UNC);
        }
}
 
void IDEHD::executeCommand(byte cmd)
{
        if (0x10 <= cmd && cmd < 0x20) {
                // Recalibrate
                setError(0);
                setByteCount(0);
                return;
        }
        switch (cmd) {
        case 0x20: // Read Sector
        case 0x21: // Read Sector without Retry
        case 0x30: // Write Sector
        case 0x31: { // Write Sector without Retry
                unsigned sectorNumber = getSectorNumber();
                unsigned numSectors = getNumSectors();
                if ((sectorNumber + numSectors) > getNbSectors()) {
                        // Note: The original code set ABORT as well, but that is not
                        //       allowed according to the spec.
                        setError(IDNF);
                        break;
                }
                transferSectorNumber = sectorNumber;
                if (cmd < 0x30) {
                        startLongReadTransfer(numSectors * 512);
                } else {
                        startWriteTransfer(numSectors * 512);
                }
                break;
        }
 
        case 0xF8: // Read Native Max Address
                // We don't support the Host Protected Area feature set, but SymbOS
                // uses only this particular command, so we support just this one.
                // TODO this only supports 28-bit sector numbers
                setSectorNumber(unsigned(getNbSectors()));
                break;
 
        default: // all others
                AbstractIDEDevice::executeCommand(cmd);
        }
}
 
 
template<typename Archive>
void IDEHD::serialize(Archive& ar, unsigned /*version*/)
{
        // don't serialize SectorAccessibleDisk, DiskContainer base classes
        ar.template serializeBase<HD>(*this);
        ar.template serializeBase<AbstractIDEDevice>(*this);
        ar.serialize("transferSectorNumber", transferSectorNumber);
}
INSTANTIATE_SERIALIZE_METHODS(IDEHD);
REGISTER_POLYMORPHIC_INITIALIZER(IDEDevice, IDEHD, "IDEHD");
 
} // namespace openmsx