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MouFilter_IsrHook routine

MouFilter_IsrHook is a template for a PI8042_MOUSE_ISR callback routine that customizes the operation of the I8042prt mouse ISR.

Syntax

BOOLEAN MouFilter_IsrHook(
   PDEVICE_OBJECT        DeviceObject,
   PMOUSE_INPUT_DATA     CurrentInput,
   POUTPUT_PACKET        CurrentOutput,
   UCHAR                 StatusByte,
   PUCHAR                DataByte,
   PBOOLEAN              ContinueProcessing,
   PMOUSE_STATE          MouseState,
   PMOUSE_RESET_SUBSTATE ResetSubState
);

Parameters

  • DeviceObject
    Pointer to the filter device object of the driver that supplies this callback.

  • CurrentInput
    Pointer to the input MOUSE_INPUT_DATA structure being constructed by the ISR.

  • CurrentOutput
    Pointer to the OUTPUT_PACKET structure that specifies the bytes being written to the hardware device.

  • StatusByte
    Specifies a status byte that is read from I/O port 60 when the interrupt occurs.

  • DataByte
    Specifies a data byte that is read from I/O port 64 when the interrupt occurs.

  • ContinueProcessing
    Specifies, if TRUE, that the I8042prt mouse ISR continues processing after this callback returns. Otherwise, processing is not continued.

  • MouseState
    Pointer to a MOUSE_STATE enumeration value, which identifies the state of mouse input.

  • ResetSubState
    Pointer to MOUSE_RESET_SUBSTATE enumeration value, which identifies the mouse reset substate. See the Remarks section.

Return value

MouFilter_IsrHook returns TRUE if the interrupt service routine should continue; otherwise it returns FALSE.

Remarks

A MouFilter_IsrHook callback is not needed if the default operation of I8042prt is sufficient.

The I8042prt mouse ISR calls MouFilter_IsrHook after it validates the interrupt.

To reset a mouse, I8042prt goes through a sequence of operational substates, each one of which is identified by an MOUSE_RESET_SUBSTATE enumeration value. For more information about how I8042prt resets a mouse and the corresponding mouse reset substates, see the documentation of MOUSE_RESET_SUBSTATE in ntdd8042.h.

MouFilter_IsrHook runs in kernel mode at the IRQL of the I8042prt mouse ISR.

Requirements

Target platform

Header

Moufiltr.h (include Moufiltr.h)

IRQL

See Remarks section.

See also

MOUSE_INPUT_DATA

MOUSE_STATE

OUTPUT_PACKET

PI8042_MOUSE_ISR

 

 

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