User mode and Kernel mode examples 2023

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User mode and Kernel mode examples

In computing, user mode and kernel mode are two distinct modes of operation that a computer's CPU (central processing unit) can run in. The CPU switches between these modes depending on the type of work it is currently doing.

In user mode, the CPU has limited access to system resources, such as memory and hardware devices. This mode is intended for running user applications, such as word processors and web browsers. These applications do not have direct access to the underlying hardware and must request access to system resources through the operating system.

In contrast, kernel mode is a more privileged mode of operation that allows the CPU to have direct access to all system resources, including memory and hardware devices. This mode is typically used by the operating system and device drivers to manage the system's resources and provide services to user-mode applications.

An example of a user mode application is a web browser, which allows users to browse the internet and access web pages. In order to do this, the web browser must request access to the system's network hardware and memory through the operating system, which runs in kernel mode.

An example of a kernel mode application is the operating system itself, which manages the system's resources and provides services to user-mode applications. When a user-mode application, such as a web browser, needs to access a system resource, it must request access through the operating system, which then switches the CPU into kernel mode to fulfill the request.

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