The device management of the operating system is not the management of all hardware resources. The device management functions of the operating system: buffer management, device allocation, device processing, device independence and virtual devices, etc.
The operating system (Operating System, referred to as OS) is a computer program that manages computer hardware and software resources. The operating system needs to handle basic tasks such as managing and configuring memory, determining the priority of system resource supply and demand, controlling input and output devices, operating the network, and managing the file system. The operating system also provides an operating interface for users to interact with the system.
Function of device management in the operating system
1. Buffer management
In order to alleviate the contradiction between the speed mismatch between the CPU and the I/O device, To improve CPU and I/O device utilization and improve system throughput, many operating systems achieve this by setting buffers.
2. Device allocation
The basic task of device allocation is to allocate the required devices to users based on their I/O requests. If there are device controllers and channels between the I/O device and the CPU, the corresponding controllers and channels need to be assigned to the allocated devices.
3. Device processing
The device processing program is also called the device driver. Its basic task is to implement communication between the CPU and the device controller.
4. Device independence and virtual devices
The devices that users apply for and use from the system have nothing to do with the actual devices they operate
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