ntv2linuxdriverinterface.cpp

Go to the documentation of this file.

/* SPDX-License-Identifier: MIT */
#include "ntv2linuxdriverinterface.h"
#include "ntv2linuxpublicinterface.h"
#include "ntv2utils.h"
#include "ajabase/system/debug.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

using namespace std;


//  LinuxDriverInterface Logging Macros
#define HEX2(__x__)         "0x" << hex << setw(2)  << setfill('0') << (0xFF       & uint8_t (__x__)) << dec
#define HEX4(__x__)         "0x" << hex << setw(4)  << setfill('0') << (0xFFFF     & uint16_t(__x__)) << dec
#define HEX8(__x__)         "0x" << hex << setw(8)  << setfill('0') << (0xFFFFFFFF & uint32_t(__x__)) << dec
#define HEX16(__x__)        "0x" << hex << setw(16) << setfill('0') <<               uint64_t(__x__)  << dec
#define INSTP(_p_)          HEX16(uint64_t(_p_))

#define LDIFAIL(__x__)      AJA_sERROR  (AJA_DebugUnit_DriverInterface, INSTP(this) << "::" << AJAFUNC << ": " << __x__)
#define LDIWARN(__x__)      AJA_sWARNING(AJA_DebugUnit_DriverInterface, INSTP(this) << "::" << AJAFUNC << ": " << __x__)
#define LDINOTE(__x__)      AJA_sNOTICE (AJA_DebugUnit_DriverInterface, INSTP(this) << "::" << AJAFUNC << ": " << __x__)
#define LDIINFO(__x__)      AJA_sINFO   (AJA_DebugUnit_DriverInterface, INSTP(this) << "::" << AJAFUNC << ": " << __x__)
#define LDIDBG(__x__)       AJA_sDEBUG  (AJA_DebugUnit_DriverInterface, INSTP(this) << "::" << AJAFUNC << ": " << __x__)

#define AsFrameStampStructPtr(_p_)  reinterpret_cast<FRAME_STAMP_STRUCT*>(_p_)
#define AsStatusStructPtr(_p_)      reinterpret_cast<AUTOCIRCULATE_STATUS_STRUCT*>(_p_)
#define AsTransferStatusStruct(_p_) reinterpret_cast<PAUTOCIRCULATE_TRANSFER_STATUS_STRUCT>(_p_)
#define AsRoutingTablePtr(_p_)      reinterpret_cast<NTV2RoutingTable*>(_p_)
#define AsPTaskStruct(_p_)          reinterpret_cast<PAUTOCIRCULATE_TASK_STRUCT>(_p_)
#define AsPTransferStruct(_p_)      reinterpret_cast<PAUTOCIRCULATE_TRANSFER_STRUCT>(_p_)
#define AsVoidPtr(_p_)              reinterpret_cast<void*>(_p_)


CNTV2LinuxDriverInterface::CNTV2LinuxDriverInterface()
    :   _bitfileDirectory           ("../xilinx")
        ,_hDevice                   (INVALID_HANDLE_VALUE)
#if !defined(NTV2_DEPRECATE_16_0)
        ,_pDMADriverBufferAddress   (AJA_NULL)
        ,_BA0MemorySize             (0)
        ,_pDNXRegisterBaseAddress   (AJA_NULL)
        ,_BA2MemorySize             (0)
        ,_BA4MemorySize             (0)
#endif  //  !defined(NTV2_DEPRECATE_16_0)
{
}

CNTV2LinuxDriverInterface::~CNTV2LinuxDriverInterface()
{
    if (IsOpen())
        Close();
}


#if !defined(NTV2_NULL_DEVICE)
// Board Open / Close methods
bool CNTV2LinuxDriverInterface::OpenLocalPhysical (const UWord inDeviceIndex)
{
    static const string kAJANTV2("ajantv2");
    NTV2_ASSERT(!IsRemote());
    NTV2_ASSERT(!IsOpen());

    string boardStr;
    UWord count = 0;
    for (UWord index = 0; index < NTV2_MAXBOARDS; index++)
    {
        ostringstream oss;  oss << "/dev/" << kAJANTV2 << DEC(index);
        boardStr = oss.str();
        _hDevice = HANDLE(open(boardStr.c_str(), O_RDWR));
        if (_hDevice != INVALID_HANDLE_VALUE)
        {
            if (count == inDeviceIndex)
                break;
            count++;
            close(int(_hDevice));
            _hDevice = INVALID_HANDLE_VALUE;
        }
    }

    if (_hDevice == INVALID_HANDLE_VALUE)
        {LDIFAIL("Failed to open device index '" << inDeviceIndex << "'");  return false;}

    setDeviceIndexNumber(inDeviceIndex);
    if (!CNTV2DriverInterface::ReadRegister(kRegBoardID, _boardID))
    {
        LDIFAIL ("ReadRegister failed for 'kRegBoardID': ndx=" << inDeviceIndex << " hDev=" << _hDevice << " id=" << HEX8(_boardID));
        if (!CNTV2DriverInterface::ReadRegister(kRegBoardID, _boardID))
        {
            LDIFAIL ("ReadReg retry failed for 'kRegBoardID': ndx=" << inDeviceIndex << " hDev=" << _hDevice << " id=" << HEX8(_boardID));
            close(int(_hDevice));
            return false;
        }
        LDIDBG("Retry succeeded: ndx=" << GetIndexNumber() << " hDev=" << _hDevice << " id=" << ::NTV2DeviceIDToString(_boardID));
    }
    _boardOpened = true;
    LDIINFO ("Opened '" << boardStr << "' devID=" << HEX8(_boardID) << " ndx=" << DEC(GetIndexNumber()));
    return true;
}


bool CNTV2LinuxDriverInterface::CloseLocalPhysical (void)
{
#if !defined(NTV2_DEPRECATE_16_0)
    UnmapXena2Flash();
    UnmapDMADriverBuffer();
#endif  //  !defined(NTV2_DEPRECATE_16_0)

    LDIINFO ("Closed deviceID=" << HEX8(_boardID) << " ndx=" << DEC(GetIndexNumber()) << " hDev=" << _hDevice);
    if (_hDevice != INVALID_HANDLE_VALUE)
        close(int(_hDevice));
    _hDevice = INVALID_HANDLE_VALUE;
    _boardOpened = false;
    _boardID = DEVICE_ID_NOTFOUND;
//  don't change, breaks vdev opening       _boardNumber = NTV2_MAXBOARDS;
    return true;
}
#endif  //  !defined(NTV2_NULL_DEVICE)


// Read and Write Register methods


bool CNTV2LinuxDriverInterface::ReadRegister (const ULWord inRegNum,  ULWord & outValue,  const ULWord inMask,  const ULWord inShift)
{
    if (inShift >= 32)
    {
        LDIFAIL("Shift " << DEC(inShift) << " > 31, reg=" << DEC(inRegNum) << " msk=" << xHEX0N(inMask,8));
        return false;
    }
#if defined(NTV2_NUB_CLIENT_SUPPORT)
    if (IsRemote())
        return CNTV2DriverInterface::ReadRegister (inRegNum, outValue, inMask, inShift);
#endif  //  defined(NTV2_NUB_CLIENT_SUPPORT)
    if ((_hDevice == INVALID_HANDLE_VALUE) || (_hDevice == 0))
        return false;

    REGISTER_ACCESS ra;
    ra.RegisterNumber = inRegNum;
    ra.RegisterMask   = inMask;
    ra.RegisterShift  = inShift;
    ra.RegisterValue  = 0xDEADBEEF;
    AJADebug::StatTimerStart(AJA_DebugStat_ReadRegister);
    const int result (ioctl(int(_hDevice), IOCTL_NTV2_READ_REGISTER, &ra));
    AJADebug::StatTimerStop(AJA_DebugStat_ReadRegister);
    if (result)
        {LDIFAIL("IOCTL_NTV2_READ_REGISTER failed");    return false;}
    outValue = ra.RegisterValue;
#if defined(NTV2_PRETEND_DEVICE)
    if (inRegNum == kRegBoardID  &&  outValue == NTV2_PRETEND_DEVICE_FROM)
        outValue = NTV2_PRETEND_DEVICE_TO;
//  else if (inRegNum == kRegReserved83  ||  inRegNum == kRegLPRJ45IP)
//      outValue = 0x0A03FAD9;  //  Local IPv4    10.3.250.217
#endif  //  NTV2_PRETEND_DEVICE
    return true;
}


bool CNTV2LinuxDriverInterface::WriteRegister (const ULWord inRegNum,  const ULWord inValue,  const ULWord inMask, const ULWord inShift)
{
    if (inShift >= 32)
    {
        LDIFAIL("Shift " << DEC(inShift) << " > 31, reg=" << DEC(inRegNum) << " msk=" << xHEX0N(inMask,8));
        return false;
    }
#if defined(NTV2_WRITEREG_PROFILING)    //  Register Write Profiling
    if (mRecordRegWrites)
    {
        AJAAutoLock autoLock(&mRegWritesLock);
        mRegWrites.push_back(NTV2RegInfo(inRegNum, inValue, inMask, inShift));
        if (mSkipRegWrites)
            return true;
    }
#endif  //  defined(NTV2_WRITEREG_PROFILING)    //  Register Write Profiling
#if defined(NTV2_NUB_CLIENT_SUPPORT)
    if (IsRemote())
        return CNTV2DriverInterface::WriteRegister(inRegNum, inValue, inMask, inShift);
#endif  //  defined(NTV2_NUB_CLIENT_SUPPORT)
    if ((_hDevice == INVALID_HANDLE_VALUE) || (_hDevice == 0))
        {LDIFAIL("_hDevice is invalid (0 or -1)");  return false;}
    REGISTER_ACCESS ra;
    ra.RegisterNumber   = inRegNum;
    ra.RegisterValue    = inValue;
    ra.RegisterMask     = inMask;
    ra.RegisterShift    = inShift;
    AJADebug::StatTimerStart(AJA_DebugStat_WriteRegister);
    const int result (ioctl(int(_hDevice), IOCTL_NTV2_WRITE_REGISTER, &ra));
    AJADebug::StatTimerStop(AJA_DebugStat_WriteRegister);
    if (result)
        {LDIFAIL("IOCTL_NTV2_WRITE_REGISTER failed");  return false;}
    return true;
}

bool CNTV2LinuxDriverInterface::RestoreHardwareProcampRegisters (void)
{
    if (IsRemote())
        return false;
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    if (ioctl(int(_hDevice), IOCTL_NTV2_RESTORE_HARDWARE_PROCAMP_REGISTERS))
        {LDIFAIL("IOCTL_NTV2_RESTORE_HARDWARE_PROCAMP_REGISTERS failed"); return false;}
    return true;
}

// Interrupt enabling / disabling method

// Method:  ConfigureInterrupt
// Input:   bool bEnable (turn on/off interrupt), INTERRUPT_ENUMS eInterruptType
// Output:  bool status
// Purpose: Provides a 1 point connection to driver for interrupt calls
bool CNTV2LinuxDriverInterface::ConfigureInterrupt (const bool bEnable, const INTERRUPT_ENUMS eInterruptType)
{
    if (IsRemote())
        return false;
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    NTV2_INTERRUPT_CONTROL_STRUCT intrControlStruct;
    memset(&intrControlStruct, 0, sizeof(NTV2_INTERRUPT_CONTROL_STRUCT));   // Suppress valgrind error
    intrControlStruct.eInterruptType = eInterruptType;
    intrControlStruct.enable = bEnable;
    if (ioctl(int(_hDevice), IOCTL_NTV2_INTERRUPT_CONTROL, &intrControlStruct))
    {
        LDIFAIL("IOCTL_NTV2_INTERRUPT_CONTROL failed");
        return false;
    }
    return true;
}

// Method: getInterruptCount
// Input:  INTERRUPT_ENUMS  eInterruptType.  Currently only output vertical interrupts are supported.
// Output: ULWord or equivalent(i.e. ULWord).
bool CNTV2LinuxDriverInterface::GetInterruptCount (const INTERRUPT_ENUMS eInterruptType, ULWord & outCount)
{
    if (!IsOpen())
        {LDIFAIL("Failed for '" << NTV2CfgInterrupt::IntName(eInterruptType) << "': device not open");  return false;}
    if (!NTV2_IS_VALID_INTERRUPT_ENUM(eInterruptType))
        {LDIFAIL("Failed for '" << NTV2CfgInterrupt::IntName(eInterruptType) << "': bad interrupt ID");  return false;}
#if defined(NTV2_NUB_CLIENT_SUPPORT)
    if (IsRemote())
        return CNTV2DriverInterface::GetInterruptCount(eInterruptType, outCount);
#endif  //  defined(NTV2_NUB_CLIENT_SUPPORT)
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    if (   eInterruptType != eVerticalInterrupt
        && eInterruptType != eInput1
        && eInterruptType != eInput2
        && eInterruptType != eInput3
        && eInterruptType != eInput4
        && eInterruptType != eInput5
        && eInterruptType != eInput6
        && eInterruptType != eInput7
        && eInterruptType != eInput8
        && eInterruptType != eOutput2
        && eInterruptType != eOutput3
        && eInterruptType != eOutput4
        && eInterruptType != eOutput5
        && eInterruptType != eOutput6
        && eInterruptType != eOutput7
        && eInterruptType != eOutput8
        && eInterruptType != eAuxVerticalInterrupt
       )
    {
        LDIFAIL("Unsupported interrupt count request. Only vertical input interrupts counted.");
        return false;
    }

    NTV2_INTERRUPT_CONTROL_STRUCT intrControlStruct;
    memset(&intrControlStruct, 0, sizeof(NTV2_INTERRUPT_CONTROL_STRUCT));// Suppress valgrind error
    intrControlStruct.eInterruptType = eGetIntCount;
    intrControlStruct.interruptCount = eInterruptType;

    AJADebug::StatTimerStart(AJA_DebugStat_GetInterruptCount);
    const int result (ioctl(int(_hDevice), IOCTL_NTV2_INTERRUPT_CONTROL, &intrControlStruct));
    AJADebug::StatTimerStop(AJA_DebugStat_GetInterruptCount);
    if (result)
        {LDIFAIL("IOCTL_NTV2_INTERRUPT_CONTROL failed");    return false;}

    outCount = intrControlStruct.interruptCount;
    return true;
}

static const uint32_t sIntEnumToStatKeys[] = {  AJA_DebugStat_WaitForInterruptOut1,     //  eOutput1    //  0
                                                AJA_DebugStat_WaitForInterruptOthers,                   //  1
                                                AJA_DebugStat_WaitForInterruptIn1,      //  eInput1     //  2
                                                AJA_DebugStat_WaitForInterruptIn2,      //  eInput2     //  3
                                                AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, //  4 thru 13
                                                AJA_DebugStat_WaitForInterruptUartTx1,  //  eUart1Tx    //  14
                                                AJA_DebugStat_WaitForInterruptUartRx1,  //  eUart1Rx    //  15
                                                AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, //  16 thru 23
                                                AJA_DebugStat_WaitForInterruptIn3,      //  eInput3     //  24
                                                AJA_DebugStat_WaitForInterruptIn4,      //  eInput4     //  25
                                                AJA_DebugStat_WaitForInterruptUartTx2,  //  eUartTx2    //  26
                                                AJA_DebugStat_WaitForInterruptUartRx2,  //  eUartRx2    //  27
                                                AJA_DebugStat_WaitForInterruptOthers,                   //  28
                                                AJA_DebugStat_WaitForInterruptIn5,      //  eInput5     //  29
                                                AJA_DebugStat_WaitForInterruptIn6,      //  eInput6     //  30
                                                AJA_DebugStat_WaitForInterruptIn7,      //  eInput7     //  31
                                                AJA_DebugStat_WaitForInterruptIn8,      //  eInput8     //  32
                                                AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers, AJA_DebugStat_WaitForInterruptOthers};  //  33 thru 41

// Method: WaitForInterrupt
// Output: True on successs, false on failure (ioctl failed or interrupt didn't happen)
bool CNTV2LinuxDriverInterface::WaitForInterrupt (const INTERRUPT_ENUMS type, const ULWord timeOutMs)
{
    if (!IsOpen())
        {LDIWARN("Cannot wait for '" << NTV2CfgInterrupt::IntName(type) << "' -- device not open");  return false;}
    if (!NTV2_IS_VALID_INTERRUPT_ENUM(type))
        {LDIWARN("Cannot wait for '" << NTV2CfgInterrupt::IntName(type) << "' -- bad interrupt id");  return false;}
#if defined(NTV2_NUB_CLIENT_SUPPORT)
    if (IsRemote())
        return CNTV2DriverInterface::WaitForInterrupt(type, timeOutMs);
#endif  //  defined(NTV2_NUB_CLIENT_SUPPORT)
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );

    NTV2_WAITFOR_INTERRUPT_STRUCT waitIntrStruct;
    waitIntrStruct.eInterruptType = type;
    waitIntrStruct.timeOutMs = timeOutMs;
    waitIntrStruct.success = 0; // Assume failure
    AJADebug::StatTimerStart(sIntEnumToStatKeys[type]);
    const int result (ioctl(int(_hDevice), IOCTL_NTV2_WAITFOR_INTERRUPT, &waitIntrStruct));
    AJADebug::StatTimerStop(sIntEnumToStatKeys[type]);
    if (result)
        {LDIFAIL("Interrupt '" << NTV2CfgInterrupt::IntName(type) << "' failed: 'IOCTL_NTV2_WAITFOR_INTERRUPT' returned " << xHEX0N(result,8)); return false;}
    BumpEventCount(type);
    LDIDBG("Interrupt '" << NTV2CfgInterrupt::IntName(type) << "' triggered, count=" << mEventCounts.at(type));
    return waitIntrStruct.success != 0;
}

// Method: ControlDriverDebugMessages
// Output: True on successs, false on failure (ioctl failed or interrupt didn't happen)
bool CNTV2LinuxDriverInterface::ControlDriverDebugMessages (NTV2_DriverDebugMessageSet msgSet, bool enable)
{
    if (IsRemote())
        return false;
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    NTV2_CONTROL_DRIVER_DEBUG_MESSAGES_STRUCT cddmStruct;
    cddmStruct.msgSet = msgSet;
    cddmStruct.enable = enable;
    if (ioctl(int(_hDevice), IOCTL_NTV2_CONTROL_DRIVER_DEBUG_MESSAGES, &cddmStruct))
    {
        LDIFAIL("IOCTL_NTV2_CONTROL_DRIVER_DEBUG_MESSAGES failed");
        return false;
    }
    return cddmStruct.success != 0;
}

// Method: SetupBoard
// Output: True on successs, false on failure (ioctl failed or interrupt didn't happen)
bool CNTV2LinuxDriverInterface::SetupBoard (void)
{
    if (IsRemote())
        return false;
    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    if (ioctl(int(_hDevice), IOCTL_NTV2_SETUP_BOARD, 0, 0))     // Suppress valgrind errors
    {
        LDIFAIL("IOCTL_NTV2_SETUP_BOARD failed");
        return false;
    }
    return true;
}

// OEM Mapping to Userspace Methods

#if !defined(NTV2_DEPRECATE_16_0)
    // Method:  MapFrameBuffers
    // Input:   None
    // Output:  bool, and sets member _pBaseFrameAddress
    bool CNTV2LinuxDriverInterface::MapFrameBuffers (void)
    {
        if (!IsOpen())
            return false;
        if (!_pFrameBaseAddress)
        {
            // Get memory window size from driver
            ULWord BA1MemorySize;
            if (!GetBA1MemorySize(&BA1MemorySize))
            {
                LDIFAIL ("MapFrameBuffers failed - couldn't get BA1MemorySize");
                return false;
            }
    
            if (BA1MemorySize == 0)
            {
                LDIFAIL ("BA1MemorySize is 0 -- module loaded with MapFrameBuffers=0?");
                LDIFAIL ("PIO mode not available, only driverbuffer DMA.");
                return false;
            }
    
            // If BA1MemorySize is 0, then the module was loaded with MapFrameBuffers=0
            // and PIO mode is not available.
    
            // Map the memory.  For Xena(da) boards, the window will be the same size as the amount of
            // memory on the Xena card.  For Xena(mm) cards, it will be a window which is selected using
            // SetPCIAccessFrame().
            //
            // the offset of 0 in the call to mmap tells mmap to map BAR1 which is the framebuffers.
            _pFrameBaseAddress = reinterpret_cast<ULWord*>(mmap(AJA_NULL, BA1MemorySize, PROT_READ | PROT_WRITE, MAP_SHARED, int(_hDevice), 0));
            if (_pFrameBaseAddress == MAP_FAILED)
            {
                _pFrameBaseAddress = AJA_NULL;
                LDIFAIL ("MapFrameBuffers failed in call to mmap()");
                return false;
            }
    
            // Set the CH1 and CH2 frame base addresses for cards that require them.
            ULWord boardIDRegister;
            ReadRegister(kRegBoardID, boardIDRegister); //unfortunately GetBoardID is in ntv2card...ooops.
            if ( ! ::NTV2DeviceIsDirectAddressable(NTV2DeviceID(boardIDRegister)))
                _pCh1FrameBaseAddress = _pFrameBaseAddress;
        }
        return true;
    }

    // Method:  UnmapFrameBuffers
    // Input:   None
    // Output:  bool status
    bool CNTV2LinuxDriverInterface::UnmapFrameBuffers (void)
    {
        if (!_pFrameBaseAddress)
            return true;
        if (!IsOpen())
            return false;
    
        // Get memory window size from driver
        ULWord BA1MemorySize;
        if (!GetBA1MemorySize(&BA1MemorySize))
        {
            LDIFAIL ("UnmapFrameBuffers failed - couldn't get BA1MemorySize");
            return false;
        }
        if (_pFrameBaseAddress)
            munmap(_pFrameBaseAddress, BA1MemorySize);
        _pFrameBaseAddress = AJA_NULL;
        return true;
    }

    // Method:  MapRegisters
    // Input:   None
    // Output:  bool, and sets member _pBaseFrameAddress
    bool CNTV2LinuxDriverInterface::MapRegisters (void)
    {
        if (!IsOpen())
            return false;
        if (!_pRegisterBaseAddress)
        {
            // Get register window size from driver
            if (!GetBA0MemorySize(&_BA0MemorySize))
            {
                LDIFAIL ("MapRegisters failed - couldn't get BA0MemorySize");
                _pRegisterBaseAddress = AJA_NULL;
                return false;
            }
    
            if (!_BA0MemorySize)
            {
                LDIFAIL ("BA0MemorySize is 0, registers not mapped.");
                _pRegisterBaseAddress = AJA_NULL;
                return false;
            }
    
            // the offset of 0x1000 in the call to mmap tells mmap to map BAR0 which is the registers.
            // 2.4 kernel interprets offset as number of pages, so 0x1000 works. This won't work on a 2.2
            // kernel
            _pRegisterBaseAddress = reinterpret_cast<ULWord*>(mmap(AJA_NULL,_BA0MemorySize,PROT_READ | PROT_WRITE,MAP_SHARED,_hDevice,0x1000));
            if (_pRegisterBaseAddress == MAP_FAILED)
            {
                _pRegisterBaseAddress = AJA_NULL;
                return false;
            }
        }
        return true;
    }

    // Method:  UnmapRegisters
    // Input:   None
    // Output:  bool status
    bool CNTV2LinuxDriverInterface::UnmapRegisters (void)
    {
        if (!IsOpen())
            return false;
        if (!_pRegisterBaseAddress)
            return true;
        if (_pRegisterBaseAddress)
            munmap(_pRegisterBaseAddress,_BA0MemorySize);
        _pRegisterBaseAddress = AJA_NULL;
        return true;
    }

    bool CNTV2LinuxDriverInterface::GetBA0MemorySize (ULWord* memSize)
    {
        return memSize ? ReadRegister (kVRegBA0MemorySize, *memSize) : false;
    }

    bool CNTV2LinuxDriverInterface::GetBA1MemorySize (ULWord* memSize)
    {
        return memSize ? ReadRegister (kVRegBA1MemorySize, *memSize) : false;
    }

    bool CNTV2LinuxDriverInterface::GetBA2MemorySize (ULWord* memSize)
    {
        return memSize ? ReadRegister (kVRegBA2MemorySize, *memSize) : false;
    }

    bool CNTV2LinuxDriverInterface::GetBA4MemorySize (ULWord* memSize)
    {
        return memSize ? ReadRegister (kVRegBA4MemorySize, *memSize) : false;
    }

    bool CNTV2LinuxDriverInterface::MapXena2Flash (void)
    {
        if (!IsOpen())
            return false;
        ULWord BA4MemorySize;
        if (!_pXena2FlashBaseAddress)
        {
            if ( !GetBA4MemorySize(&BA4MemorySize) )
            {
                LDIFAIL ("MapXena2Flash failed - couldn't get BA4MemorySize");
                _pXena2FlashBaseAddress = AJA_NULL;
                return false;
            }
            if (!BA4MemorySize)
            {
                LDIFAIL ("MapXena2Flash failed - BA4MemorySize == 0");
                _pXena2FlashBaseAddress = AJA_NULL;
                return false;
            }
            _BA4MemorySize = BA4MemorySize;
            // 0x4000 is a page offset magic token passed into the driver mmap callback that ends up mapping the right stuff
            _pXena2FlashBaseAddress = reinterpret_cast<ULWord*>(mmap(AJA_NULL, BA4MemorySize,
                                                                    PROT_READ | PROT_WRITE, MAP_SHARED,
                                                                    int(_hDevice), 0x4000));
            if (_pXena2FlashBaseAddress == MAP_FAILED)
            {
                _pXena2FlashBaseAddress = AJA_NULL;
                LDIFAIL ("MapXena2Flash(): mmap of BAR4 for PCI Flash failed");
                return false;
            }
        }
        return true;
    }

    bool CNTV2LinuxDriverInterface::UnmapXena2Flash (void)
    {
        if (!_pXena2FlashBaseAddress)
            return true;
        if (!IsOpen())
            return false;
        if (_pXena2FlashBaseAddress)
        {
            munmap(_pXena2FlashBaseAddress, _BA4MemorySize);
            _BA4MemorySize = 0;
        }
        _pXena2FlashBaseAddress = AJA_NULL;
        return false;
    }

    bool CNTV2LinuxDriverInterface::MapDNXRegisters (void)
    {
        ULWord BA2MemorySize;
        if (!IsOpen())
            return false;
        if (!_pDNXRegisterBaseAddress)
        {
            if (!GetBA2MemorySize(&BA2MemorySize))
            {
                LDIFAIL ("MapDNXRegisters failed - couldn't get BA2MemorySize");
                return false;
            }
            if (!BA2MemorySize)
            {
                LDIFAIL ("MapDNXRegisters failed - BA2MemorySize == 0");
                return false;
            }
            _BA2MemorySize = BA2MemorySize;
    
            // 0x8000 is a page offset magic token passed into the driver mmap callback
            // that ends up mapping the right stuff
            _pDNXRegisterBaseAddress = reinterpret_cast<ULWord*>(mmap (AJA_NULL, BA2MemorySize,
                                                                        PROT_READ | PROT_WRITE, MAP_SHARED,
                                                                        int(_hDevice), 0x8000));
            if (_pDNXRegisterBaseAddress == MAP_FAILED)
            {
                _pDNXRegisterBaseAddress = AJA_NULL;
                _BA2MemorySize           = 0;
                LDIFAIL ("MapDNXRegisters failed - couldn't map BAR2");
                return false;
            }
        }
        return true;
    }

    bool CNTV2LinuxDriverInterface::UnmapDNXRegisters (void)
    {
        if (!_pDNXRegisterBaseAddress)
            return true;
        if (!IsOpen())
            return false;
        if (_pDNXRegisterBaseAddress)
        {
            munmap(_pDNXRegisterBaseAddress, _BA2MemorySize);
            _BA2MemorySize = 0;
        }
        _pDNXRegisterBaseAddress = AJA_NULL;
        return false;
    }
#endif  //  !defined(NTV2_DEPRECATE_16_0)


// DMA
//
// Note: Asynchronous DMA only available with driver-allocated buffers.

bool CNTV2LinuxDriverInterface::DmaTransfer (   const NTV2DMAEngine inDMAEngine,
                                                const bool          inIsRead,
                                                const ULWord        inFrameNumber,
                                                ULWord *            pFrameBuffer,
                                                const ULWord        inOffsetBytes,
                                                const ULWord        inByteCount,
                                                const bool          inSynchronous)
{
    if (!IsOpen())
        return false;
    if (IsRemote())
    {
        NTV2Buffer buffer(pFrameBuffer, inByteCount);
        return _pRPCAPI->NTV2DMATransferRemote (inDMAEngine, inIsRead, inFrameNumber,
                                                buffer, inOffsetBytes, 0/*numSegs*/,
                                                0/*hostPitch*/,  0/*cardPitch*/,
                                                inSynchronous);
    }
    NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
    dmaControlBuf.engine            = inDMAEngine;
    dmaControlBuf.dmaChannel        = NTV2_CHANNEL1;
    dmaControlBuf.frameNumber       = inFrameNumber;
    dmaControlBuf.frameBuffer       = pFrameBuffer;
    dmaControlBuf.frameOffsetSrc    = inIsRead ? inOffsetBytes : 0;
    dmaControlBuf.frameOffsetDest   = inIsRead ? 0 : inOffsetBytes;
    dmaControlBuf.numBytes          = inByteCount;

    // The following are used only for driver-created buffers.
    // Set them to known values.
    dmaControlBuf.downSample        = 0;    // Not applicable to this mode
    dmaControlBuf.linePitch         = 1;    // Not applicable to this mode
    dmaControlBuf.poll              = 0;
#if defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
    ULWord numDmaDriverBuffers;
    GetDMANumDriverBuffers(&numDmaDriverBuffers);
    if (ULWord64(pFrameBuffer) >= ULWord64(numDmaDriverBuffers))
    {
        // Can't poll with usermode allocated buffer
        if (!inSynchronous)
            return false;
        dmaControlBuf.poll = 0;
    }
#endif  //  defined(NTV2_DRIVER_ALLOCATED_BUFFERS)

    int request;
    const char *errMsg(AJA_NULL);
#define ERRMSG(s) #s " failed"

    // Usermode buffer stuff
    if (inIsRead) // Reading?
    {
        if (inOffsetBytes == 0) // Frame ( or field 0? )
        {
            request = IOCTL_NTV2_DMA_READ_FRAME;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_READ_FRAME);
       }
       else // Field 1
       {
            request = IOCTL_NTV2_DMA_READ;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_READ);
       }
    }
    else // Writing
    {
        if (inOffsetBytes == 0) // Frame ( or field 0? )
        {
            request = IOCTL_NTV2_DMA_WRITE_FRAME;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE_FRAME);
       }
       else // Field 1
       {
            request = IOCTL_NTV2_DMA_WRITE;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE);
       }
    }

    // TODO: Stick the IOCTL code inside the dmaControlBuf and collapse 4 IOCTLs into one.
    AJADebug::StatTimerStart(AJA_DebugStat_DMATransfer);
    const int result (ioctl(int(_hDevice), request, &dmaControlBuf));
    AJADebug::StatTimerStop(AJA_DebugStat_DMATransfer);
    if (result)
    {
        LDIFAIL(errMsg << " FRM=" << inFrameNumber << " ENG=" << inDMAEngine << " CNT=" << inByteCount);
        return false;
    }
    return true;
}

bool CNTV2LinuxDriverInterface::DmaTransfer (const NTV2DMAEngine    inDMAEngine,
                                            const bool              inIsRead,
                                            const ULWord            inFrameNumber,
                                            ULWord *                pFrameBuffer,
                                            const ULWord            inOffsetBytes,
                                            const ULWord            inByteCount,
                                            const ULWord            inNumSegments,
                                            const ULWord            inHostPitch,
                                            const ULWord            inCardPitch,
                                            const bool              inIsSynchronous)
{
    if (!IsOpen())
        return false;
    if (IsRemote())
    {
        NTV2Buffer buffer(pFrameBuffer, inByteCount);
        return _pRPCAPI->NTV2DMATransferRemote (inDMAEngine, inIsRead, inFrameNumber, buffer, inOffsetBytes,
                                                inNumSegments, inHostPitch, inCardPitch, inIsSynchronous);
    }
    LDIDBG("FRM=" << inFrameNumber << " ENG=" << inDMAEngine << " NB=" << inByteCount << (inIsRead?" Rd":" Wr"));

    // NOTE: Linux driver assumes driver buffers to be used if pFrameBuffer < numDmaDriverBuffers
    NTV2_DMA_SEGMENT_CONTROL_STRUCT dmaControlBuf;
    dmaControlBuf.engine                = inDMAEngine;
    dmaControlBuf.dmaChannel            = NTV2_CHANNEL1;
    dmaControlBuf.frameNumber           = inFrameNumber;
    dmaControlBuf.frameBuffer           = pFrameBuffer;
    dmaControlBuf.frameOffsetSrc        = inIsRead ? inOffsetBytes : 0;
    dmaControlBuf.frameOffsetDest       = inIsRead ? 0 : inOffsetBytes;
    dmaControlBuf.numBytes              = inByteCount;
    dmaControlBuf.videoNumSegments      = inNumSegments;
    dmaControlBuf.videoSegmentHostPitch = inHostPitch;
    dmaControlBuf.videoSegmentCardPitch = inCardPitch;
    dmaControlBuf.poll                  = 0;
#if defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
    ULWord numDmaDriverBuffers(0);
    GetDMANumDriverBuffers(&numDmaDriverBuffers);
    if (ULWord(ULWord64(pFrameBuffer)) >= numDmaDriverBuffers)
    {
        if (!inIsSynchronous)
            return false;   //  Async mode requires kernel-allocated buffer
    }
#else
    NTV2_UNUSED(inIsSynchronous);
#endif  //  defined(NTV2_DRIVER_ALLOCATED_BUFFERS)

    int request(0);
    const char *errMsg(AJA_NULL);
#define ERRMSG(s) #s " failed"

    // Usermode buffer stuff
    // TODO: Stick the IOCTL code inside the dmaControlBuf and collapse 4 IOCTLs into one.
    if (inIsRead) // Reading?
    {
        if (!inOffsetBytes) // Frame ( or field 0? )
        {
            request = IOCTL_NTV2_DMA_READ_FRAME_SEGMENT;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_READ_FRAME_SEGMENT);
        }
        else // Field 1
        {
            request = IOCTL_NTV2_DMA_READ_SEGMENT;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_READ_SEGMENT);
        }
    }
    else // Writing
    {
        if (!inOffsetBytes) // Frame ( or field 0? )
        {
            request = IOCTL_NTV2_DMA_WRITE_FRAME_SEGMENT;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE_FRAME_SEGMENT);
        }
        else // Field 1
        {
            request = IOCTL_NTV2_DMA_WRITE_SEGMENT;
            errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE_SEGMENT);
        }
    }

    AJADebug::StatTimerStart(AJA_DebugStat_DMATransferEx);
    const int result (ioctl(int(_hDevice), request, &dmaControlBuf));
    AJADebug::StatTimerStop(AJA_DebugStat_DMATransferEx);
    if (result)
    {
        LDIFAIL(errMsg << " FRM=" << inFrameNumber << " ENG=" << inDMAEngine << " CNT=" << inByteCount);
        return false;
    }
    return true;
}


bool CNTV2LinuxDriverInterface::DmaTransfer (   const NTV2DMAEngine         inDMAEngine,
                                                const NTV2Channel           inDMAChannel,
                                                const bool                  inIsTarget,
                                                const ULWord                inFrameNumber,
                                                const ULWord                inCardOffsetBytes,
                                                const ULWord                inByteCount,
                                                const ULWord                inNumSegments,
                                                const ULWord                inSegmentHostPitch,
                                                const ULWord                inSegmentCardPitch,
                                                const PCHANNEL_P2P_STRUCT & inP2PData)
{
    if (!IsOpen())
        return false;
    if (IsRemote())
        return CNTV2DriverInterface::DmaTransfer (inDMAEngine, inDMAChannel, inIsTarget, inFrameNumber, inCardOffsetBytes, inByteCount,
                                                    inNumSegments, inSegmentHostPitch, inSegmentCardPitch, inP2PData);
    if (!inP2PData)
    {
        LDIFAIL( "P2PData is NULL" );
        return false;
    }

    // Information to be sent to the driver
    NTV2_DMA_P2P_CONTROL_STRUCT dmaP2PStruct;
    ::memset (AsVoidPtr(&dmaP2PStruct), 0, sizeof(dmaP2PStruct));
    if (inIsTarget)
    {
        // reset info to be passed back to the user
        ::memset (AsVoidPtr(inP2PData), 0, sizeof(CHANNEL_P2P_STRUCT));
        inP2PData->p2pSize = sizeof(CHANNEL_P2P_STRUCT);
    }
    else
    {
        // check for valid p2p struct
        if (inP2PData->p2pSize != sizeof(CHANNEL_P2P_STRUCT))
        {
            LDIFAIL("p2pSize=" << DEC(inP2PData->p2pSize) << " != sizeof(CHANNEL_P2P_STRUCT) " << DEC(sizeof(CHANNEL_P2P_STRUCT)));
            return false;
        }
    }

    dmaP2PStruct.bRead                  = inIsTarget;
    dmaP2PStruct.dmaEngine              = inDMAEngine;
    dmaP2PStruct.dmaChannel             = inDMAChannel;
    dmaP2PStruct.ulFrameNumber          = inFrameNumber;
    dmaP2PStruct.ulFrameOffset          = inCardOffsetBytes;
    dmaP2PStruct.ulVidNumBytes          = inByteCount;
    dmaP2PStruct.ulVidNumSegments       = inNumSegments;
    dmaP2PStruct.ulVidSegmentHostPitch  = inSegmentHostPitch;
    dmaP2PStruct.ulVidSegmentCardPitch  = inSegmentCardPitch;
    dmaP2PStruct.ullVideoBusAddress     = inP2PData->videoBusAddress;
    dmaP2PStruct.ullMessageBusAddress   = inP2PData->messageBusAddress;
    dmaP2PStruct.ulVideoBusSize         = inP2PData->videoBusSize;
    dmaP2PStruct.ulMessageData          = inP2PData->messageData;
    AJADebug::StatTimerStart(AJA_DebugStat_DMATransferP2P);
    const int result (ioctl(int(_hDevice), IOCTL_NTV2_DMA_P2P, &dmaP2PStruct));
    AJADebug::StatTimerStop(AJA_DebugStat_DMATransferP2P);
    if (result)
        {LDIFAIL("IOCTL error");    return false;}

    // fill in p2p data
    inP2PData->videoBusAddress      = dmaP2PStruct.ullVideoBusAddress;
    inP2PData->messageBusAddress    = dmaP2PStruct.ullMessageBusAddress;
    inP2PData->videoBusSize         = dmaP2PStruct.ulVideoBusSize;
    inP2PData->messageData          = dmaP2PStruct.ulMessageData;
    return true;
}

// AutoCirculate
bool CNTV2LinuxDriverInterface::AutoCirculate (AUTOCIRCULATE_DATA & autoCircData)
{
    if (IsRemote())
        return CNTV2DriverInterface::AutoCirculate(autoCircData);
    if (!IsOpen())
        return false;

    int result(1);
    switch (autoCircData.eCommand)
    {
        case eInitAutoCirc:
        case eStartAutoCirc:
        case eStopAutoCirc:
        case eAbortAutoCirc:
        case ePauseAutoCirc:
        case eFlushAutoCirculate:
        case ePrerollAutoCirculate:
            // Pass the autoCircData structure to the driver.
            // The driver knows the implicit meanings of the
            // members of the structure based on the the
            // command contained within it.
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_CONTROL, &autoCircData);
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_CONTROL failed");  return false;}
            return true;

        case eGetAutoCirc:
            // Pass the autoCircStatus structure to the driver.
            // It will read the channel spec contained within and
            // fill out the status structure accordingly.
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_STATUS, AsStatusStructPtr(autoCircData.pvVal1));
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculate);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_STATUS, failed");  return false;}
            return true;

        case eGetFrameStamp:
        {
            // Pass the frameStamp structure to the driver.
            // It will read the channel spec and frame number
            // contained within and fill out the status structure
            // accordingly.
            AUTOCIRCULATE_FRAME_STAMP_COMBO_STRUCT acFrameStampCombo;
            memset(&acFrameStampCombo, 0, sizeof acFrameStampCombo);
            FRAME_STAMP_STRUCT* pFrameStamp = AsFrameStampStructPtr(autoCircData.pvVal1);
            acFrameStampCombo.acFrameStamp = *pFrameStamp;
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_FRAMESTAMP, &acFrameStampCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculate);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_FRAMESTAMP failed");  return false;}
            *pFrameStamp = acFrameStampCombo.acFrameStamp;
            return true;
        }

        case eGetFrameStampEx2:
        {
            // Pass the frameStamp structure to the driver.
            // It will read the channel spec and frame number
            // contained within and fill out the status structure
            // accordingly.
            AUTOCIRCULATE_FRAME_STAMP_COMBO_STRUCT acFrameStampCombo;
            memset(&acFrameStampCombo, 0, sizeof acFrameStampCombo);
            FRAME_STAMP_STRUCT* pFrameStamp = AsFrameStampStructPtr(autoCircData.pvVal1);
            PAUTOCIRCULATE_TASK_STRUCT pTask = AsPTaskStruct(autoCircData.pvVal2);
            acFrameStampCombo.acFrameStamp = *pFrameStamp;
            if (pTask)
                acFrameStampCombo.acTask = *pTask;
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_FRAMESTAMP, &acFrameStampCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculate);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_FRAMESTAMP failed");  return false;}
            *pFrameStamp = acFrameStampCombo.acFrameStamp;
            if (pTask)
                *pTask = acFrameStampCombo.acTask;
            return true;
        }

        case eTransferAutoCirculate:
        {
            PAUTOCIRCULATE_TRANSFER_STRUCT acTransfer = AsPTransferStruct(autoCircData.pvVal1);
            // If doing audio, insure buffer alignment is OK
            if (acTransfer->audioBufferSize)
            {
                if (acTransfer->audioBufferSize % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer size not mod 4");  return false;}
#if defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
                ULWord numDmaDriverBuffers;
                GetDMANumDriverBuffers(&numDmaDriverBuffers);
                if (ULWord64(acTransfer->audioBuffer) >= ULWord64(numDmaDriverBuffers)  &&  ULWord64(acTransfer->audioBuffer) % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer address not mod 4");  return false;}
#endif  //  defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
            }

            // Can't pass multiple pointers in a single ioctl, so combine
            // them into a single structure and include channel spec too.
            AUTOCIRCULATE_TRANSFER_COMBO_STRUCT acXferCombo;
            memset((void*)&acXferCombo, 0, sizeof acXferCombo);
            PAUTOCIRCULATE_TRANSFER_STATUS_STRUCT acStatus = AsTransferStatusStruct(autoCircData.pvVal2);
            NTV2RoutingTable    *pXena2RoutingTable = AsRoutingTablePtr(autoCircData.pvVal3);
            acXferCombo.channelSpec = autoCircData.channelSpec;
            acXferCombo.acTransfer = *acTransfer;
            acXferCombo.acStatus = *acStatus;
            if (!pXena2RoutingTable)
                memset(&acXferCombo.acXena2RoutingTable, 0, sizeof(acXferCombo.acXena2RoutingTable));
            else
                acXferCombo.acXena2RoutingTable = *pXena2RoutingTable;

            // Do the transfer
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculateXfer);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_TRANSFER, &acXferCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculateXfer);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_TRANSFER failed");  return false;}
            // Copy the results back into the status buffer we were given
            *acStatus = acXferCombo.acStatus;
            return true;
        }

        case eTransferAutoCirculateEx:
        {
            PAUTOCIRCULATE_TRANSFER_STRUCT acTransfer = AsPTransferStruct(autoCircData.pvVal1);
            // If doing audio, insure buffer alignment is OK
            if (acTransfer->audioBufferSize)
            {
                if (acTransfer->audioBufferSize % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer size not mod 4");  return false;}
#if defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
                ULWord numDmaDriverBuffers;
                GetDMANumDriverBuffers(&numDmaDriverBuffers);
                if ((unsigned long)acTransfer->audioBuffer >=  numDmaDriverBuffers  &&  (unsigned long)acTransfer->audioBuffer % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer address not mod 4");  return false;}
#endif  //  defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
            }

            // Can't pass multiple pointers in a single ioctl, so combine
            // them into a single structure and include channel spec too.
            AUTOCIRCULATE_TRANSFER_COMBO_STRUCT acXferCombo;
            memset((void*)&acXferCombo, 0, sizeof acXferCombo);
            PAUTOCIRCULATE_TRANSFER_STATUS_STRUCT acStatus = AsTransferStatusStruct(autoCircData.pvVal2);
            NTV2RoutingTable    *pXena2RoutingTable = AsRoutingTablePtr(autoCircData.pvVal3);
            acXferCombo.channelSpec = autoCircData.channelSpec;
            acXferCombo.acTransfer = *acTransfer;
            acXferCombo.acStatus = *acStatus;
            if (!pXena2RoutingTable)
                memset(&acXferCombo.acXena2RoutingTable, 0, sizeof(acXferCombo.acXena2RoutingTable));
            else
                acXferCombo.acXena2RoutingTable = *pXena2RoutingTable;

            // Do the transfer
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculateXfer);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_TRANSFER, &acXferCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculateXfer);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_TRANSFER failed");  return false;}
            // Copy the results back into the status buffer we were given
            *acStatus = acXferCombo.acStatus;
            return true;
        }

        case eTransferAutoCirculateEx2:
        {
            PAUTOCIRCULATE_TRANSFER_STRUCT acTransfer = AsPTransferStruct(autoCircData.pvVal1);
            // If doing audio, insure buffer alignment is OK
            if (acTransfer->audioBufferSize)
            {
                if (acTransfer->audioBufferSize % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer size not mod 4");  return false;}
#if defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
                ULWord numDmaDriverBuffers;
                GetDMANumDriverBuffers(&numDmaDriverBuffers);
                if (ULWord64(acTransfer->audioBuffer) >= ULWord64(numDmaDriverBuffers)  &&  ULWord(acTransfer->audioBuffer) % 4)
                    {LDIFAIL ("TransferAutoCirculate failed - audio buffer address not mod 4");  return false;}
#endif  //  defined(NTV2_DRIVER_ALLOCATED_BUFFERS)
            }

            // Can't pass multiple pointers in a single ioctl, so combine
            // them into a single structure and include channel spec too.
            AUTOCIRCULATE_TRANSFER_COMBO_STRUCT acXferCombo;
            ::memset(AsVoidPtr(&acXferCombo), 0, sizeof(acXferCombo));
            PAUTOCIRCULATE_TRANSFER_STATUS_STRUCT acStatus = AsTransferStatusStruct(autoCircData.pvVal2);
            NTV2RoutingTable *  pXena2RoutingTable = AsRoutingTablePtr(autoCircData.pvVal3);
            PAUTOCIRCULATE_TASK_STRUCT pTask = AsPTaskStruct(autoCircData.pvVal4);
            acXferCombo.channelSpec = autoCircData.channelSpec;
            acXferCombo.acTransfer = *acTransfer;
            acXferCombo.acStatus = *acStatus;
            if (pXena2RoutingTable)
                acXferCombo.acXena2RoutingTable = *pXena2RoutingTable;
            if (pTask)
                acXferCombo.acTask = *pTask;

            // Do the transfer
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculateXfer);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_TRANSFER, &acXferCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculateXfer);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_TRANSFER failed");  return false;}
            // Copy the results back into the status buffer we were given
            *acStatus = acXferCombo.acStatus;
            return true;
        }

        case eSetCaptureTask:
        {
            AUTOCIRCULATE_FRAME_STAMP_COMBO_STRUCT acFrameStampCombo;
            memset(&acFrameStampCombo, 0, sizeof acFrameStampCombo);
            PAUTOCIRCULATE_TASK_STRUCT pTask = AsPTaskStruct(autoCircData.pvVal1);
            acFrameStampCombo.acFrameStamp.channelSpec = autoCircData.channelSpec;
            acFrameStampCombo.acTask = *pTask;
            AJADebug::StatTimerStart(AJA_DebugStat_AutoCirculate);
            result = ioctl(int(_hDevice), IOCTL_NTV2_AUTOCIRCULATE_CAPTURETASK, &acFrameStampCombo);
            AJADebug::StatTimerStop(AJA_DebugStat_AutoCirculate);
            if (result)
                {LDIFAIL("IOCTL_NTV2_AUTOCIRCULATE_CAPTURETASK failed");  return false;}
            return true;
        }

        default:
            LDIFAIL("Unsupported AC command type in AutoCirculate()");
            break;
    }   //  switch
    return false;
}


bool CNTV2LinuxDriverInterface::NTV2Message (NTV2_HEADER * pInMessage)
{
    if (!pInMessage)
        return false;   //  NULL message pointer

    if (IsRemote())
        return CNTV2DriverInterface::NTV2Message(pInMessage);   //  Implement NTV2Message on nub

    NTV2_ASSERT( (_hDevice != INVALID_HANDLE_VALUE) && (_hDevice != 0) );
    AJADebug::StatTimerStart(AJA_DebugStat_NTV2Message);
    const int result (ioctl(int(_hDevice), IOCTL_AJANTV2_MESSAGE, pInMessage));
    AJADebug::StatTimerStop(AJA_DebugStat_NTV2Message);
    if (result)
        {LDIFAIL("IOCTL_AJANTV2_MESSAGE failed");   return false;}
    return true;
}


#if !defined(NTV2_DEPRECATE_16_0)
    bool CNTV2LinuxDriverInterface::GetDMADriverBufferPhysicalAddress (ULWord* physAddr)
    {
        return physAddr ? ReadRegister (kVRegDMADriverBufferPhysicalAddress, *physAddr) : false;
    }

    bool CNTV2LinuxDriverInterface::GetDMANumDriverBuffers (ULWord* pNumDmaDriverBuffers)
    {
        return pNumDmaDriverBuffers ? ReadRegister (kVRegNumDmaDriverBuffers, *pNumDmaDriverBuffers) : false;
    }

    // Method: MapDMADriverBuffer(Maps 8 Frames worth of memory from kernel space to user space.
    // Input:
    // Output:
    bool CNTV2LinuxDriverInterface::MapDMADriverBuffer (void)
    {
        if (!_pDMADriverBufferAddress)
        {
            ULWord numDmaDriverBuffers;
            if (!GetDMANumDriverBuffers(&numDmaDriverBuffers))
            {
                LDIFAIL("GetDMANumDriverBuffers() failed");
                return false;
            }

            if (!numDmaDriverBuffers)
            {
                LDIFAIL("numDmaDriverBuffers == 0");
                return false;
            }

            // the offset of 0x2000 in the call to mmap tells mmap to map the DMA Buffer into user space
            // 2.4 kernel interprets offset as number of pages, so 0x2000 works. This won't work on a 2.2
            // kernel
            _pDMADriverBufferAddress = reinterpret_cast<ULWord*>(mmap (AJA_NULL, GetFrameBufferSize() * numDmaDriverBuffers,
                                                                        PROT_READ | PROT_WRITE,MAP_SHARED,
                                                                        _hDevice, 0x2000));
            if (_pDMADriverBufferAddress == MAP_FAILED)
            {
                _pDMADriverBufferAddress = AJA_NULL;
                return false;
            }
        }
        return true;
    }

    bool CNTV2LinuxDriverInterface::GetDMADriverBufferAddress (ULWord** pDMADriverBufferAddress)
    {
        if (!_pDMADriverBufferAddress)
            if (!MapDMADriverBuffer())
                return false;
        *pDMADriverBufferAddress = _pDMADriverBufferAddress;
        return true;
    }

    // Method: UnmapDMADriverBuffer
    // Input:  NONE
    // Output: NONE
    bool CNTV2LinuxDriverInterface::UnmapDMADriverBuffer (void)
    {
        if (_pDMADriverBufferAddress)
        {
            ULWord numDmaDriverBuffers;
            if (!GetDMANumDriverBuffers(&numDmaDriverBuffers))
            {
                LDIFAIL("GetDMANumDriverBuffers() failed");
                return false;
            }
            if (!numDmaDriverBuffers)
            {
    
                LDIFAIL("numDmaDriverBuffers == 0");
                return false;
            }
            munmap(_pDMADriverBufferAddress, GetFrameBufferSize() * numDmaDriverBuffers);
        }
        _pDMADriverBufferAddress = AJA_NULL;
        return true;
    }
#endif  //  !defined(NTV2_DEPRECATE_16_0)

bool CNTV2LinuxDriverInterface::SetAudioOutputMode (NTV2_GlobalAudioPlaybackMode mode)
{
    return WriteRegister(kVRegGlobalAudioPlaybackMode,mode);
}

bool CNTV2LinuxDriverInterface::GetAudioOutputMode (NTV2_GlobalAudioPlaybackMode* mode)
{
    return mode ? CNTV2DriverInterface::ReadRegister(kVRegGlobalAudioPlaybackMode, *mode) : false;
}

#if !defined(NTV2_DEPRECATE_16_0)
    // Method: DmaBufferWriteFrameDriverBuffer
    // NTV2DMAEngine - DMAEngine
    // ULWord frameNumber(0 .. NUM_FRAMEBUFFERS-1)
    // ULWord dmaBufferFrame(0 .. numDmaDriverBuffers-1)
    // ULWord bytes - number of bytes to dma
    // ULWord poll - 0=block 1=return immediately and poll
    //              via register 48
    // When the board is opened the driver allocates
    // a user-definable number of frames for dmaing
    // This allows dma's to be done without scatter/gather
    // which should help performance.
    bool CNTV2LinuxDriverInterface::DmaWriteFrameDriverBuffer (NTV2DMAEngine DMAEngine, ULWord frameNumber, unsigned long dmaBufferFrame, ULWord bytes, ULWord poll)
    {
        if (IsRemote())
            return false;
        if (!IsOpen())
            return false;

        NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
        dmaControlBuf.engine = DMAEngine;
        dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
        dmaControlBuf.frameNumber = frameNumber;
        dmaControlBuf.frameBuffer = PULWord(dmaBufferFrame);
        dmaControlBuf.frameOffsetSrc = 0;
        dmaControlBuf.frameOffsetDest = 0;
        dmaControlBuf.numBytes = bytes;
        dmaControlBuf.downSample = 0;
        dmaControlBuf.linePitch = 0;
        dmaControlBuf.poll = poll;
        if (ioctl(int(_hDevice), IOCTL_NTV2_DMA_WRITE_FRAME, &dmaControlBuf))
            {LDIFAIL("IOCTL_NTV2_DMA_WRITE_FRAME failed");  return false;}
        return true;
    }

    // Method: DmaBufferWriteFrameDriverBuffer
    // NTV2DMAEngine - DMAEngine
    // ULWord frameNumber(0-NUM_FRAMEBUFFERS-1)
    // ULWord dmaBufferFrame(0 .. numDmaDriverBuffers-1)
    // ULWord bytes - number of bytes to dma
    // ULWord poll - 0=block 1=return immediately and poll
    //              via register 48
    // When the board is opened the driver allocates
    // a user-definable number of frames for dmaing
    // This allows dma's to be done without scatter/gather
    // which should help performance.
    bool CNTV2LinuxDriverInterface::DmaWriteFrameDriverBuffer (NTV2DMAEngine DMAEngine, ULWord frameNumber, unsigned long dmaBufferFrame, ULWord offsetSrc, ULWord offsetDest, ULWord bytes, ULWord poll)
    {
        if (IsRemote())
            return false;
        if (!IsOpen())
            return false;

        NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
        dmaControlBuf.engine = DMAEngine;
        dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
        dmaControlBuf.frameNumber = frameNumber;
        dmaControlBuf.frameBuffer = PULWord(dmaBufferFrame);
        dmaControlBuf.frameOffsetSrc = offsetSrc;
        dmaControlBuf.frameOffsetDest = offsetDest;
        dmaControlBuf.numBytes = bytes;
        dmaControlBuf.downSample = 0;
        dmaControlBuf.linePitch = 0;
        dmaControlBuf.poll = poll;
        if (ioctl(int(_hDevice), IOCTL_NTV2_DMA_WRITE_FRAME, &dmaControlBuf))
            {LDIFAIL("IOCTL_NTV2_DMA_WRITE_FRAME failed");  return false;}
        return true;
    }


    // Method: DmaBufferReadFrameDriverBuffer
    // NTV2DMAEngine - DMAEngine
    // ULWord frameNumber(0-NUM_FRAMEBUFFERS-1)
    // ULWord dmaBufferFrame(0 .. numDmaDriverBuffers-1)
    // ULWord bytes - number of bytes to dma
    // ULWord poll - 0=block 1=return immediately and poll
    //              via register 48
    // When the board is opened the driver allocates
    // a user-definable number of frames for dmaing
    // This allows dma's to be done without scatter/gather
    // which should help performance.
    bool CNTV2LinuxDriverInterface::DmaReadFrameDriverBuffer (NTV2DMAEngine DMAEngine, ULWord frameNumber, unsigned long dmaBufferFrame, ULWord bytes, ULWord downSample, ULWord linePitch, ULWord poll)
    {
        if (IsRemote())
            return false;
        if (!IsOpen())
            return false;

        NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
        dmaControlBuf.engine = DMAEngine;
        dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
        dmaControlBuf.frameNumber = frameNumber;
        dmaControlBuf.frameBuffer = PULWord(dmaBufferFrame);
        dmaControlBuf.frameOffsetSrc = 0;
        dmaControlBuf.frameOffsetDest = 0;
        dmaControlBuf.numBytes = bytes;
        dmaControlBuf.downSample = downSample;
        dmaControlBuf.linePitch = linePitch == 0 ? 1 : linePitch;
        dmaControlBuf.poll = poll;

        static bool bPrintedDownsampleDeprecatedMsg = false;
        if (downSample && !bPrintedDownsampleDeprecatedMsg)
            {LDIWARN("downSample is deprecated"); bPrintedDownsampleDeprecatedMsg = true;}

        if (ioctl(int(_hDevice), IOCTL_NTV2_DMA_READ_FRAME, &dmaControlBuf))
            {LDIFAIL("IOCTL_NTV2_DMA_READ_FRAME failed");  return false;}
        return true;
    }

    // Method: DmaBufferReadFrameDriverBuffer
    // NTV2DMAEngine - DMAEngine
    // ULWord frameNumber(0-NUM_FRAMEBUFFERS-1)
    // ULWord dmaBufferFrame(0 .. numDmaDriverBuffers-1)
    // ULWord bytes - number of bytes to dma
    // ULWord poll - 0=block 1=return immediately and poll
    //              via register 48
    // When the board is opened the driver allocates
    // a user-definable number of frames for dmaing
    // This allows dma's to be done without scatter/gather
    // which should help performance.
    bool CNTV2LinuxDriverInterface::DmaReadFrameDriverBuffer (NTV2DMAEngine DMAEngine, ULWord frameNumber, unsigned long dmaBufferFrame,
                                                                ULWord offsetSrc, ULWord offsetDest, ULWord bytes,
                                                                ULWord downSample, ULWord linePitch, ULWord poll)
    {
        if (IsRemote())
            return false;
        if (!IsOpen())
            return false;

        NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
        dmaControlBuf.engine = DMAEngine;
        dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
        dmaControlBuf.frameNumber = frameNumber;
        dmaControlBuf.frameBuffer = PULWord(dmaBufferFrame);
        dmaControlBuf.frameOffsetSrc = offsetSrc;
        dmaControlBuf.frameOffsetDest = offsetDest;
        dmaControlBuf.numBytes = bytes;
        dmaControlBuf.downSample = downSample;
        if( linePitch == 0 ) linePitch = 1;
        dmaControlBuf.linePitch = linePitch;
        dmaControlBuf.poll = poll;

        static bool bPrintedDownsampleDeprecatedMsg = false;
        if (downSample && !bPrintedDownsampleDeprecatedMsg)
            {LDIWARN("downSample is deprecated");  bPrintedDownsampleDeprecatedMsg = true;}

        if (ioctl(int(_hDevice), IOCTL_NTV2_DMA_READ_FRAME, &dmaControlBuf))
            {LDIFAIL("IOCTL_NTV2_DMA_READ_FRAME failed");  return false;}
        return true;
    }
#endif  //  !defined(NTV2_DEPRECATE_16_0)

bool CNTV2LinuxDriverInterface::DmaWriteWithOffsets (NTV2DMAEngine DMAEngine, ULWord frameNumber, ULWord * pFrameBuffer,
                                                    ULWord offsetSrc, ULWord offsetDest, ULWord bytes)
{
    // return DmaTransfer (DMAEngine, false, frameNumber, pFrameBuffer, (ULWord) 0, bytes, bSync);
    if (IsRemote())
        return false;
    if (!IsOpen())
        return false;
    // NOTE: Linux driver assumes driver buffers to be used if
    // pFrameBuffer < numDmaDriverBuffers
    NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
    dmaControlBuf.engine = DMAEngine;
    dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
    dmaControlBuf.frameNumber = frameNumber;
    dmaControlBuf.frameBuffer = pFrameBuffer;
    dmaControlBuf.frameOffsetSrc = offsetSrc;
    dmaControlBuf.frameOffsetDest = offsetDest;
    dmaControlBuf.numBytes = bytes;

    // The following are used only for driver-created buffers.
    // Set them to known values.
    dmaControlBuf.downSample = 0;       // Not applicable to this mode
    dmaControlBuf.linePitch = 1;        // Not applicable to this mode
    dmaControlBuf.poll = 0;             // currently can't poll with a usermode allocated dma buffer

    ULWord request;
    const char *errMsg = AJA_NULL;
#define ERRMSG(s) #s " failed"

    // Usermode buffer stuff
    if (offsetSrc == 0 && offsetDest == 0) // Frame ( or field 0? )
    {
        request = IOCTL_NTV2_DMA_WRITE_FRAME;
        errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE_FRAME);
    }
    else // Field 1 or audio
    {
        request = IOCTL_NTV2_DMA_WRITE;
        errMsg = ERRMSG(IOCTL_NTV2_DMA_WRITE);
    }

    if (ioctl(int(_hDevice), request, &dmaControlBuf))
        {LDIFAIL(errMsg);  return false;}
    return true;
}

bool CNTV2LinuxDriverInterface::DmaReadWithOffsets (NTV2DMAEngine DMAEngine, ULWord frameNumber, ULWord * pFrameBuffer,
                                                    ULWord offsetSrc, ULWord offsetDest, ULWord bytes)
{
    // return DmaTransfer (DMAEngine, false, frameNumber, pFrameBuffer, (ULWord) 0, bytes, bSync);
    if (IsRemote())
        return false;
    if (!IsOpen())
        return false;

    // NOTE: Linux driver assumes driver buffers to be used if
    // pFrameBuffer < numDmaDriverBuffers
    NTV2_DMA_CONTROL_STRUCT dmaControlBuf;
    dmaControlBuf.engine = DMAEngine;
    dmaControlBuf.dmaChannel = NTV2_CHANNEL1;
    dmaControlBuf.frameNumber = frameNumber;
    dmaControlBuf.frameBuffer = pFrameBuffer;
    dmaControlBuf.frameOffsetSrc = offsetSrc;
    dmaControlBuf.frameOffsetDest = offsetDest;
    dmaControlBuf.numBytes = bytes;

    // The following are used only for driver-created buffers.
    // Set them to known values.
    dmaControlBuf.downSample = 0;       // Not applicable to this mode
    dmaControlBuf.linePitch = 1;        // Not applicable to this mode
    dmaControlBuf.poll = 0;             // currently can't poll with a usermode allocated dma buffer
    ULWord request;
    const char *errMsg = AJA_NULL;
#define ERRMSG(s) #s " failed"

    // Usermode buffer stuff
    if (offsetSrc == 0 && offsetDest == 0) // Frame ( or field 0? )
    {
        request = IOCTL_NTV2_DMA_READ_FRAME;
        errMsg = ERRMSG(IOCTL_NTV2_DMA_READ_FRAME);
    }
    else // Field 1 or audio
    {
        request = IOCTL_NTV2_DMA_READ;
        errMsg = ERRMSG(IOCTL_NTV2_DMA_READ);
    }

    if (ioctl(int(_hDevice), request, &dmaControlBuf))
        {LDIFAIL(errMsg);  return false;}
    return true;
#undef ERRMSG
}