Entry +Points

Driver +entry points

The Device Driver framework supports the following +device driver models:

The LDD-PDD model: +drivers of this type must be loaded by a user application.
The kernel extension model: +drivers of this type are loaded by the Kernel at boot up.
The combined model +is a combination of the kernel extension and LDD-PDD models. This is used +when the driver must perform some initialization at the time of boot up.

For each model, the Kernel provides a standard API for the entry +points to the driver.

Standard LDD

For a standard LDD-PDD driver, the +driver entry points are defined by the following macros:

For LDDs, +use DECLARE_STANDARD_LDD. For example:

// LDD entry point +DECLARE_STANDARD_LDD() + { + // create LDD factory object + return new DExDriverLogicalDevice; + }

Standard PDD

For PDDs, use DECLARE_STANDARD_PDD. +For example:

// PDD entry point +DECLARE_STANDARD_PDD() + { + // create PDD factory object + return new DExH4PhysicalDevice; + }

Kernel extension

For a kernel extension, the entry +point is defined by the macro DECLARE_STANDARD_EXTENSION.

Combined model

For drivers with a combined model, +the entry points are defined by the following macros:

A driver creates factory objects in the entry point routines.