serial.h

串口Windows驱动

    //

    ULONG NewPortIndex;
    ULONG NewMaskInverted;
    PVOID NewExtension;

    //
    // We hold the character that should be transmitted immediately.
    //
    // Note that we can't use this to determine whether there is
    // a character to send because the character to send could be
    // zero.
    //
    UCHAR ImmediateChar;

    //
    // This holds the mask that will be used to mask off unwanted
    // data bits of the received data (valid data bits can be 5,6,7,8)
    // The mask will normally be 0xff.  This is set while the control
    // lock is held since it wouldn't have adverse effects on the
    // isr if it is changed in the middle of reading characters.
    // (What it would do to the app is another question - but then
    // the app asked the driver to do it.)
    //
    UCHAR ValidDataMask;

    //
    // The application can turn on a mode,via the
    // IOCTL_SERIAL_LSRMST_INSERT ioctl, that will cause the
    // serial driver to insert the line status or the modem
    // status into the RX stream.  The parameter with the ioctl
    // is a pointer to a UCHAR.  If the value of the UCHAR is
    // zero, then no insertion will ever take place.  If the
    // value of the UCHAR is non-zero (and not equal to the
    // xon/xoff characters), then the serial driver will insert.
    //
    UCHAR EscapeChar;

    //
    // These two booleans are used to indicate to the isr transmit
    // code that it should send the xon or xoff character.  They are
    // only accessed at open and at interrupt level.
    //
    BOOLEAN SendXonChar;
    BOOLEAN SendXoffChar;

    //
    // This boolean will be true if a 16550 is present *and* enabled.
    //
    BOOLEAN FifoPresent;

    //
    // This is the water mark that the rxfifo should be
    // set to when the fifo is turned on.  This is not the actual
    // value, but the encoded value that goes into the register.
    //
    UCHAR RxFifoTrigger;

    //
    // Says whether this device can share interrupts with devices
    // other than serial devices.
    //
    BOOLEAN InterruptShareable;

    //
    // Records whether we actually created the symbolic link name
    // at driver load time.  If we didn't create it, we won't try
    // to destroy it when we unload.
    //
    BOOLEAN CreatedSymbolicLink;

    //
    // Records whether we actually created an entry in SERIALCOMM
    // at driver load time.  If we didn't create it, we won't try
    // to destroy it when the device is removed.
    //
    BOOLEAN CreatedSerialCommEntry;

    //
    // We place all of the kernel and Io subsystem "opaque" structures
    // at the end of the extension.  We don't care about their contents.
    //

    //
    // This lock will be used to protect various fields in
    // the extension that are set (& read) in the extension
    // by the io controls.
    //
    KSPIN_LOCK ControlLock;

    //
    // This lock will be used to protect the accept / reject state
    // transitions and flags of the driver  It must be acquired
    // before a cancel lock
    //

    KSPIN_LOCK FlagsLock;

    //
    // This points to a DPC used to complete read requests.
    //
    KDPC CompleteWriteDpc;

    //
    // This points to a DPC used to complete read requests.
    //
    KDPC CompleteReadDpc;

    //
    // This dpc is fired off if the timer for the total timeout
    // for the read expires.  It will execute a dpc routine that
    // will cause the current read to complete.
    //
    //
    KDPC TotalReadTimeoutDpc;

    //
    // This dpc is fired off if the timer for the interval timeout
    // expires.  If no more characters have been read then the
    // dpc routine will cause the read to complete.  However, if
    // more characters have been read then the dpc routine will
    // resubmit the timer.
    //
    KDPC IntervalReadTimeoutDpc;

    //
    // This dpc is fired off if the timer for the total timeout
    // for the write expires.  It will execute a dpc routine that
    // will cause the current write to complete.
    //
    //
    KDPC TotalWriteTimeoutDpc;

    //
    // This dpc is fired off if a comm error occurs.  It will
    // execute a dpc routine that will cancel all pending reads
    // and writes.
    //
    KDPC CommErrorDpc;

    //
    // This dpc is fired off if an event occurs and there was
    // a irp waiting on that event.  A dpc routine will execute
    // that completes the irp.
    //
    KDPC CommWaitDpc;

    //
    // This dpc is fired off when the transmit immediate char
    // character is given to the hardware.  It will simply complete
    // the irp.
    //
    KDPC CompleteImmediateDpc;

    //
    // This dpc is fired off if the transmit immediate char
    // character times out.  The dpc routine will "grab" the
    // irp from the isr and time it out.
    //
    KDPC TotalImmediateTimeoutDpc;

    //
    // This dpc is fired off if the timer used to "timeout" counting
    // the number of characters received after the Xoff ioctl is started
    // expired.
    //
    KDPC XoffCountTimeoutDpc;

    //
    // This dpc is fired off if the xoff counter actually runs down
    // to zero.
    //
    KDPC XoffCountCompleteDpc;

    //
    // This dpc is fired off only from device level to start off
    // a timer that will queue a dpc to check if the RTS line
    // should be lowered when we are doing transmit toggling.
    //
    KDPC StartTimerLowerRTSDpc;

    //
    // This dpc is fired off when a timer expires (after one
    // character time), so that code can be invoked that will
    // check to see if we should lower the RTS line when
    // doing transmit toggling.
    //
    KDPC PerhapsLowerRTSDpc;

    //
    // This DPC is fired to set an event stating that all other
    // DPC's have been finish for this device extension so that
    // paged code may be unlocked.
    //

    KDPC IsrUnlockPagesDpc;

    //
    // This is the kernal timer structure used to handle
    // total read request timing.
    //
    KTIMER ReadRequestTotalTimer;

    //
    // This is the kernal timer structure used to handle
    // interval read request timing.
    //
    KTIMER ReadRequestIntervalTimer;

    //
    // This is the kernal timer structure used to handle
    // total time request timing.
    //
    KTIMER WriteRequestTotalTimer;

    //
    // This is the kernal timer structure used to handle
    // total time request timing.
    //
    KTIMER ImmediateTotalTimer;

    //
    // This timer is used to timeout the xoff counter
    // io.
    //
    KTIMER XoffCountTimer;

    //
    // This timer is used to invoke a dpc one character time
    // after the timer is set.  That dpc will be used to check
    // whether we should lower the RTS line if we are doing
    // transmit toggling.
    //
    KTIMER LowerRTSTimer;

    //
    // This is a pointer to the next lower device in the IRP stack.
    //

    PDEVICE_OBJECT LowerDeviceObject;

    //
    // This is where keep track of the power state the device is in.
    //

    DEVICE_POWER_STATE PowerState;

    //
    // Pointer to the driver object
    //

    PDRIVER_OBJECT DriverObject;


    //
    // Event used to do some synchronization with the devices underneath me
    // (namely ACPI)
    //

    KEVENT SerialSyncEvent;


    //
    // String where we keep the symbolic link that is returned to us when we
    // register our device under the COMM class with the Plug and Play manager.
    //

    UNICODE_STRING DeviceClassSymbolicName;


    //
    // Serial ISR switch structure
    //

    PSERIAL_CISR_SW CIsrSw;

    //
    // Count of pending IRP's
    //

    ULONG PendingIRPCnt;

    //
    // Accepting requests?
    //

    ULONG DevicePNPAccept;

    //
    // No IRP's pending event
    //

    KEVENT PendingIRPEvent;

    //
    // PNP State
    //

    ULONG PNPState;

    //
    // Misc Flags
    //

    ULONG Flags;

    //
    // Open count
    //

    LONG OpenCount;

    //
    // Start sync event
    //

    KEVENT SerialStartEvent;

    //
    // Current state during powerdown
    //

    SERIAL_DEVICE_STATE DeviceState;

    //
    // Device stack capabilites
    //

    DEVICE_POWER_STATE DeviceStateMap[PowerSystemMaximum];

    //
    // Event to signal transition to D0 completion
    //

    KEVENT PowerD0Event;

    //
    // List of stalled IRP's
    //

    LIST_ENTRY StalledIrpQueue;

    //
    // Mutex on open status
    //

    FAST_MUTEX OpenMutex;

    //
    // Mutex on close
    //

    FAST_MUTEX CloseMutex;

    //
    // TRUE if we own power policy
    //

    BOOLEAN OwnsPowerPolicy;

    //
    // TRUE if we should retain power on close and not aggressively
    // reduce power consumption
    //

    BOOLEAN RetainPowerOnClose;

    //
    // TRUE - queue create irps while device is in D3
    // FALSE - process create irps while device is in D3
    //

    BOOLEAN QueueCreateIrp;
    
    //
    // SystemWake from devcaps
    //

    SYSTEM_POWER_STATE SystemWake;

    //
    // DeviceWake from devcaps
    //

    DEVICE_POWER_STATE DeviceWake;

    //
    // Our PDO
    //

    PDEVICE_OBJECT Pdo;

    //
    // Should we enable wakeup
    //

    BOOLEAN SendWaitWake;

    //
    // Pending wait wake IRP
    //

    PIRP PendingWakeIrp;

    //
    // WMI Information
    //

    WMILIB_CONTEXT WmiLibInfo;

    //
    // Name to use as WMI identifier
    //

    UNICODE_STRING WmiIdentifier;

    //
    // WMI Comm Data
    //

    SERIAL_WMI_COMM_DATA WmiCommData;

    //
    // WMI HW Data
    //

    SERIAL_WMI_HW_DATA WmiHwData;

    //
    // WMI Performance Data
    //

    SERIAL_WMI_PERF_DATA WmiPerfData;

    //
    // Pending DPC count
    //