DriverEntry of Video Miniport Driver

DriverEntry of Video Miniport Driver

ULONG DriverEntry(

IN PVOID Context1,
IN PVOID Context2
);

Each miniport driver must have a function explicitly named DriverEntry in order to be loaded.

Parameters

Context1

Points to a context with which the miniport driver must call VideoPortInitialize.

Context2

Points to a second context with which the miniport driver must call VideoPortInitialize.

Return Value

DriverEntry returns the value returned by VideoPortInitialize.

Comments

DriverEntry is called directly by the I/O system.

First, DriverEntry allocates memory on the stack and calls VideoPortZeroMemory to initialize a VIDEO_HW_INITIALIZATION_DATA structure. Then, DriverEntry fills in driver-supplied data in the VIDEO_HW_INITIALIZATION_DATA structure and calls VideoPortInitialize.

If a miniport driver supports adapter(s) that can be connected on different types of I/O bus, such as both MicroChannel and Isa type buses, it should call VideoPortInitialize once for each type of I/O bus. Such a miniport driver must return the lowest value returned by its calls to VideoPortInitialize from the DriverEntry function. The writer of such a driver should make no assumptions about the values returned by VideoPortInitialize.