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- Drivers Sreb Mouse Filter Replacement
- Drivers Sreb Mouse Filter Instructions
- Drivers Sreb Mouse Filter Cross Reference
- Drivers Sreb Mouse Filter Removal Tool
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Filter drivers are optional drivers that add value to or modify the behavior of a device. A filter driver can service one or more devices.
Bus Filter Drivers
Bus filter drivers typically add value to a bus and are supplied by Microsoft or a system OEM (see the Possible Driver Layers figure). Bus filter drivers are optional. There can be any number of bus filter drivers for a bus.
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A bus filter driver could, for example, implement proprietary enhancements to standard bus hardware.
For devices described by an ACPI BIOS, the power manager inserts a Microsoft-supplied ACPI filter (bus filter driver) above the bus driver for each such device. The ACPI filter carries out device power policy and powers on and off devices. The ACPI filter is transparent to other drivers and is not present on non-ACPI machines.
Lower-Level Filter Drivers
Lower-level filter drivers typically modify the behavior of device hardware (see the Possible Driver Layers figure). They are typically supplied by IHVs and are optional. There can be any number of lower-level filter drivers for a device.
A lower-level device filter driver monitors and/or modifies I/O requests to a particular device. Typically, such filters redefine hardware behavior to match expected specifications.
A lower-level class filter driver monitors and/or modifies I/O requests for a class of devices. For example, a lower-level class filter driver for mouse devices could provide acceleration, performing a nonlinear conversion of mouse movement data.
Upper-Level Filter Drivers
Upper-level filter drivers typically provide added-value features for a device (see the Possible Driver Layers figure). Such drivers are usually provided by IHVs and are optional. There can be any number of upper-level filter drivers for a device.
An upper-level device filter driver adds value for a particular device. For example, an upper-level device filter driver for a keyboard could enforce additional security checks.
An upper-level class filter driver adds value for all devices of a particular class.
-->This topic describes the features of the following sample filter drivers in the Microsoft Windows Driver Kit (WDK):
Kbfiltr, an optional upper-level filter driver for a Plug and Play PS/2-style keyboard device
Moufiltr, an optional upper-level filter driver for a Plug and Play PS/2-style mouse device
Kbfiltr and Moufiltr demonstrate how to filter I/O requests and add callback routines that modify the operation of the class service and the operation of I8042prt.
Note The design of the Terminal Server for Windows 2000 and later does not support using the sample keyboard and mouse filter drivers to filter input from devices physically installed on a remote client. A filter driver installed on a Terminal Server can only be used to filter the input from the devices physically installed on a Terminal Server. This is a consequence of the way the TermDD.sys driver for the Terminal Server handles input from remote clients.
Kbfiltr and Moufiltr support Plug and Play and power management.
Kbfiltr provides the following callback routines:
KbFilter_ServiceCallback
The keyboard filter service callback is added to the keyboard class service callback. The filter service callback can be configured to modify the keyboard input data that is saved in the class driver's data queue.
KbFilter_IsrHook
The keyboard filter ISR hook routine is a template for the IsrRoutine callback that I8042prt supports for a keyboard device. The callback can be configured to customize the operation of an ISR of a keyboard.
KbFilter_InitializationRoutine
The keyboard filter initialization routine is a template for the InitializationRoutine callback that I8042prt supports for a keyboard device. This callback can be configured to customize the initialization of a keyboard device.
Moufiltr provides the following callback routines:
MouFilter_ServiceCallback
The mouse filter service callback is added to the mouse class service callback. The filter service callback can be configured to modify the mouse input data that is saved in the class driver's data queue.
MouFilter_IsrHook
The mouse filter ISR hook routine is a template for the IsrRoutine callback that I8042prt supports for a mouse device. The callback can be configured to customize the operation of that mouse's ISR.
Customize the initialization and ISR of a device
Drivers Sreb Mouse Filter Replacement
Vendors can supply optional upper-level device filter drivers that can add the following optional callbacks to the operation of I8042prt:
PI8042_KEYBOARD_ISR
The keyboard interrupt service routine (ISR) customizes the operation of the I8042prt keyboard ISR. A keyboard ISR callback is not needed if the default operation of I8042prt is sufficient. After the I8042prt keyboard ISR validates a keyboard interrupt, it calls the keyboard ISR callback.
PI8042_MOUSE_ISR
The mouse ISR customizes the operation of the I8042prt mouse ISR. A mouse ISR callback is not needed if the default operation of I8042prt is sufficient. After the I8042prt mouse ISR validates a mouse interrupt, it calls the mouse ISR callback.
PI8042_KEYBOARD_INITIALIZATION_ROUTINE
The keyboard initialization callback supplements the default initialization of a keyboard device by I8042prt. I8042prt calls this routine when it initializes a keyboard device.
I8042prt adds the callbacks provided by an upper-level device filter driver by using an IOCTL_INTERNAL_I8042_HOOK_KEYBOARD request for a keyboard device and an IOCTL_INTERNAL_I8042_HOOK_MOUSE request for a mouse device. After I8042prt receives a connect request from a device class driver, I8042prt synchronously sends the device-specific hook request to the top of the device stack.
After a filter driver receives a hook request, it does the following:
Saves the upper-level driver hook information, if any, that is passed to the filter driver.
The hook information includes a pointer to a context, a pointer to an ISR callback, and a pointer to an initialization callback (initialization callback for a keyboard only).
Replaces the upper-level driver hook information with the filter driver's hook information.
Saves the context of I8042prt and the pointers to callbacks that the filter driver callbacks can use.
The sample filter drivers, Kbfiltr and Moufiltr, provide the following callback routines:
KbFilter_IsrHook is a template for the PI8042_KEYBOARD_ISR callback.
KbFilter_InitializationRoutine is a template for the PI8042_KEYBOARD_INITIALIZATION_ROUTINE callback.
MouFilter_IsrHook is a template for the PI8042_MOUSE_ISR callback.
Synchronize the operation of a filter driver with a device's ISR
Drivers Sreb Mouse Filter Instructions
I8042prt uses a start information request to pass a pointer to a device's interrupt object to the upper-level drivers in its device stack. After a device is started, the filter driver can use the interrupt object to synchronize its operation with the interrupt service routine. Filter drivers should only use the interrupt object in calls to KeSynchronizeExecution.
I8042prt passes the interrupt object pointer to the top of the device stack by using an IOCTL_INTERNAL_I8042_KEYBOARD_START_INFORMATION request for a keyboard device and an IOCTL_INTERNAL_I8042_MOUSE_START_INFORMATION request for a mouse device. I8042prt synchronously sends a start information request to the top of the device stack after the hardware initialization of a device. After a filter driver receives a start information request, it saves the start information and passes the request down the device stack. I8042prt completes the request.
Synchronize writes by a filter driver to a device
To customize the operation of a device, a filter driver needs to write control data to the device. The filter driver must synchronize writes to a device with the device's interrupt service routine and other asynchronous reads or writes on the device (for example, writes that are initiated by a set typematic request or a set keyboard indicator request).
I8042prt supports an IOCTL_INTERNAL_I8042_KEYBOARD_WRITE_BUFFER request and an IOCTL_INTERNAL_I8042_MOUSE_WRITE_BUFFER request for this purpose. A write buffer request is synchronized with the device's ISR and other requests that read or write the device.
Drivers Sreb Mouse Filter Cross Reference
I8042prt callbacks that filter drivers can use
I8042prt supports the following callbacks that an upper-level device filter driver can use in its ISR callback:
PI8042_ISR_WRITE_PORT
A write port callback for a device writes to the i8042 port at the IRQL of the device's ISR.
PI8042_QUEUE_PACKET
A queue packet callback for a device queues an input data packet for processing by the device's ISR DPC.
Drivers Sreb Mouse Filter Removal Tool
PI8042_SYNCH_READ_PORT
This callback can be used in a PI8042_KEYBOARD_INITIALIZATION_ROUTINE callback. I8042prt specifies the read port callback in the ReadPort parameter that I8042prt inputs to a keyboard initialization routine.
PI8042_SYNCH_WRITE_PORT
This callback can be used in a PI8042_KEYBOARD_INITIALIZATION_ROUTINE callback. I8042prt specifies the write port callback in the WritePort parameter that I8042prt inputs to a keyboard initialization routine.
I8042prt passes pointers to the keyboard device callbacks in a INTERNAL_I8042_HOOK_KEYBOARD structure that I8042prt uses to input information with an IOCTL_INTERNAL_I8042_HOOK_KEYBOARD request.
I8042prt passes pointers to the mouse device callbacks in a INTERNAL_I8042_HOOK_MOUSE structure that I8042prt uses to input information with an IOCTL_INTERNAL_I8042_HOOK_KEYBOARD request.
After a filter driver receives a hook device request, it saves the I8042prt callback pointers for use in the filter driver's ISR callback.