Getting Started with Linux device drivers

The role of device drivers

The operation of any computer system is the result of the combination of hardware and software, and the computer system's hardware and software accomplish each other.

Application software engineers need to see a pure software world without hardware, and the hardware must be rendered transparently. Drive engineers to realize the invisibility of hardware to software engineers.

Device Drivers act as a link between hardware and application software. In the absence of an operating system, engineers can define their own interfaces according to the characteristics of the hardware device. In the case of an operating system, the driver architecture is defined by the corresponding operating system, and the driver engineer must drive in accordance with the corresponding architecture design to be able to integrate the kernel into the operating system well.

Device driver with no operating system

Single function, control is not complicated system such as: refrigerator, bus card machine, microwave oven and so on do not need multi-task scheduling, file system, memory management and other complex functions, with a single mission architecture can well support their work.

In the absence of an operating system, the device-driven interface is directly presented to the application software engineer, and the application software does not directly access the device-driven interface across any level.

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Device driver with operating system

The operating system is designed to facilitate the upper-level application by creating trouble for the driver.

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