//
    // Holds the pointer to the Vendor Leaf information
    //
    PTEXTUAL_LEAF VendorLeaf;

    //
    // Holds the length of the VendorLeaf pointer.
    //
    ULONG ModelLeafLength;

    //
    // Holds the pointer to the Model Leaf information
    //
    PTEXTUAL_LEAF ModelLeaf;

    //
    // Holds the 1394 10 bit BusId / 6 bit NodeId structure
    //
    NODE_ADDRESS NodeAddress;

    //
    // Holds the speed to be used in reaching this device
    //
    UCHAR Speed;

    //
    // Holds the priority at which to send packets
    //
    UCHAR Priority;

    //
    // Holds the Irp used to notify this device object about events
    //
    PIRP Irp;

    //
    // Holds the Device Object that this Device Extension hangs off of
    //
    PDEVICE_OBJECT DeviceObject;

    //
    // Holds the Port Device Object that this Device hangs off of
    //
    PDEVICE_OBJECT PortDeviceObject;

    //
    // Holds the pointer to corresponding information about this deivce
    // in the bus driver's head.
    //
    PVOID DeviceInformation;

    //
    // Holds the pointer to the bus reset notification routine (if any)
    //
    PBUS_BUS_RESET_NOTIFICATION ResetRoutine;

    //
    // Holds the pointer to the context the client wanted when bus reset occurs
    //

    PVOID ResetContext;

} NODE_DEVICE_EXTENSION, *PNODE_DEVICE_EXTENSION;


//
// Definition of Isoch descriptor
//
typedef struct _ISOCH_DESCRIPTOR {

    //
    // Flags (used in synchronization)
    //
    ULONG fulFlags;

    //
    // Mdl pointing to buffer
    //
    PMDL Mdl;

    //
    // Length of combined buffer(s) as represented by the Mdl
    //
    ULONG ulLength;

    //
    // Payload size of each Isoch packet to be used in this descriptor
    //
    ULONG nMaxBytesPerFrame;

    //
    // Synchronization field; equivalent to Sy in the Isoch packet
    //
    ULONG ulSynch;

    //
    // Synchronization field; equivalent to Tag in the Isoch packet
    //
    ULONG ulTag;

    //
    // Cycle time field; returns time to be sent/received or when finished
    //
    CYCLE_TIME CycleTime;

    //
    // Callback routine (if any) to be called when this descriptor completes
    //
    PBUS_ISOCH_DESCRIPTOR_ROUTINE Callback;

    //
    // First context (if any) parameter to be passed when doing callbacks
    //
    PVOID Context1;

    //
    // Second context (if any) parameter to be passed when doing callbacks
    //
    PVOID Context2;

    //
    // Holds the final status of this descriptor
    //
    NTSTATUS status;

    //
    // Reserved for the device driver who submitted this descriptor to
    // stomp in.
    //
    ULONG_PTR DeviceReserved[8];

    //
    // Reserved for the bus driver to stomp in
    //
    ULONG_PTR BusReserved[8];

    //
    // Reserved for the port driver to stomp in
    //
    ULONG_PTR PortReserved[16];


} ISOCH_DESCRIPTOR, *PISOCH_DESCRIPTOR;


//
// definition of header element for scatter/gather support
//

typedef struct _IEEE1394_SCATTER_GATHER_HEADER{

    USHORT HeaderLength;
    USHORT DataLength;
    UCHAR HeaderData;

} IEEE1394_SCATTER_GATHER_HEADER, *PIEEE1394_SCATTER_GATHER_HEADER;


//
// Definition of Bandwidth allocation structure
//
typedef struct _BANDWIDTH_ALLOCATION {

    //
    // Holds the list of allocation entries
    //
    LIST_ENTRY AllocationList;

    //
    // Holds the tag of this structure
    //
    ULONG Tag;

    //
    // Holds the Bandwidth units that this allocation owns
    //
    ULONG OwnedUnits;

    //
    // Holds the speed at which this bandwidth was allocated
    //
    ULONG fulSpeed;

    //
    // Holds whether or not this was a local or remote allocation
    //
    BOOLEAN bRemoteAllocation;

    //
    // Holds the generation of the bus when this bandwidth was secured
    //
    ULONG Generation;

    //
    // Holds the owner of this allocation
    //
    PNODE_DEVICE_EXTENSION DeviceExtension;

} BANDWIDTH_ALLOCATION, *PBANDWIDTH_ALLOCATION;


//
// IEEE 1394 Request Block definition (IRB).  IRBs are the basis of how other
// device drivers communicate with the 1394 Bus driver.
//
typedef struct _IRB {

    //
    // Holds the zero based Function number that corresponds to the request
    // that device drivers are asking the 1394 Bus driver to carry out.
    //
    ULONG FunctionNumber;

    //
    // Holds Flags that may be unique to this particular operation
    //
    ULONG Flags;

    //
    // Reserved for internal bus driver use and/or future expansion
    //
    ULONG_PTR BusReserved[IRB_BUS_RESERVED_SZ];

    //
    // Reserved for internal port driver usage
    //
    ULONG_PTR PortReserved[IRB_PORT_RESERVED_SZ];

    //
    // Holds the structures used in performing the various 1394 APIs
    //

    union {

        //
        // Fields necessary in order for the 1394 stack to carry out an
        // AsyncRead request.
        //
        struct {
            IO_ADDRESS      DestinationAddress;     // Address to read from
            ULONG           nNumberOfBytesToRead;   // Bytes to read
            ULONG           nBlockSize;             // Block size of read
            ULONG           fulFlags;               // Flags pertinent to read
            PMDL            Mdl;                    // Destination buffer
            ULONG           ulGeneration;           // Generation as known by driver
            UCHAR           chPriority;             // Priority to send
            UCHAR           nSpeed;                 // Speed at which to send
            UCHAR           tCode;                  // Type of Read to do
            UCHAR           Reserved;               // Used to determine medium delay
            ULONG           ElapsedTime;            // Only valid for flag ASYNC_FLAGS_PING
                                                    // units in nano secs..
        } AsyncRead;

        //
        // Fields necessary in order for the 1394 stack to carry out an
        // AsyncWrite request.
        //
        struct {
            IO_ADDRESS      DestinationAddress;     // Address to write to
            ULONG           nNumberOfBytesToWrite;  // Bytes to write
            ULONG           nBlockSize;             // Block size of write
            ULONG           fulFlags;               // Flags pertinent to write
            PMDL            Mdl;                    // Destination buffer
            ULONG           ulGeneration;           // Generation as known by driver
            UCHAR           chPriority;             // Priority to send
            UCHAR           nSpeed;                 // Speed at which to send
            UCHAR           tCode;                  // Type of Write to do
            UCHAR           Reserved;               // Reserved for future use
            ULONG           ElapsedTime;            // Only valid for flag ASYNC_FLAGS_PING
        } AsyncWrite;

        //
        // Fields necessary in order for the 1394 stack to carry out an
        // AsyncLock request.
        //
        struct {
            IO_ADDRESS      DestinationAddress;     // Address to lock to
            ULONG           nNumberOfArgBytes;      // Bytes in Arguments
            ULONG           nNumberOfDataBytes;     // Bytes in DataValues
            ULONG           fulTransactionType;     // Lock transaction type
            ULONG           fulFlags;               // Flags pertinent to lock
            ULONG           Arguments[2];           // Arguments used in Lock
            ULONG           DataValues[2];          // Data values
            PVOID           pBuffer;                // Destination buffer (virtual address)
            ULONG           ulGeneration;           // Generation as known by driver
            UCHAR           chPriority;             // Priority to send
            UCHAR           nSpeed;                 // Speed at which to send
            UCHAR           tCode;                  // Type of Lock to do
            UCHAR           Reserved;               // Reserved for future use
        } AsyncLock;

        //
        // Fields necessary in order for the Bus driver to carry out an
        // IsochAllocateBandwidth request
        //
        struct {
            ULONG           nMaxBytesPerFrameRequested; // Bytes per Isoch frame
            ULONG           fulSpeed;                   // Speed flags
            HANDLE          hBandwidth;                 // bandwidth handle returned
            ULONG           BytesPerFrameAvailable;     // Available bytes per frame
            ULONG           SpeedSelected;              // Speed to be used
            ULONG           nBandwidthUnitsRequired;    // pre-calculated value
        } IsochAllocateBandwidth;

        //
        // Fields necessary in order for the Bus driver to carry out a
        // IsochAllocateChannel request.
        //
        struct {
            ULONG           nRequestedChannel;      // Need a specific channel
            ULONG           Channel;                // Returned channel
            LARGE_INTEGER   ChannelsAvailable;      // Channels available
        } IsochAllocateChannel;

        //
        // Fields necessary in order for the Bus driver to carry out a
        // IsochAllocateResources request
        // Instructions:
        // Receive alloc:
        // fulSpeed - should be the max speed the tx side is expected to stream
        // The payload size in nMaxBytesPerFram cannot exceed the max payload for
        // for this speed.
        // fulFlags - For receive, wtih the standard header stripped, the field should
        // be = (RESOURCE_USED_IN_LISTEN | RESOURCES_STRIP_ADDITIONAL_QUADLETS)
        // Also nQuadletsToStrip = 1
        // For no stripping set nQuadsTostrip to 0 and dont specify the stripping flag.
        // nMaxBytesPerframe - If not stripping it should include the 8 bytes for header/trailer
        // expected to be recieved for each packet.
        // nNumberOfBuffer - see below
        // nMaxBufferSize - This should be always such mode(nMaxBufferSize,nMaxBytesPerFrame) == 0
        // (integer product of number of bytes per packet).
        // nQuadletsTostrip - If stripping only one quadlet (standrd iso header) this is set to 1
        // if zero, the isoch header will be included AND the trailer. So 8 bytes extra will be recieved
        // hResource - see below

        struct {
            ULONG           fulSpeed;               // Speed flags