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The UEFI specification defines an interface between operating systems and platform firmware. The interface consists of data tables that contain platform-related information, plus boot and runtime service calls that are available to the operating system and its loader. Together, these provide a standard, modern environment for booting an operating system and running pre-boot applications. In addition to the services, UEFI defines various protocols/APIs to access various hardware and the boot devices in the system. The UEFI specification also defines a driver model that is generic and can be adapted to any type of bus or device. The UEFI Driver Model is designed to support the execution of modular pieces of code, known as drivers that run in the preboot environment.
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