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

Desktop

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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