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Difference between User Mode and Kernel Mode
2022-10-28 00:39:52

Difference between User Mode and Kernel Mode

User mode and kernel mode are the two operating systems on a computer. The computer is in user mode when it is executing application software. The computer enters kernel mode after the application software requests the hardware. The kernel is the system’s heart. The computer then regularly alternates between kernel mode and user mode. The majority of an operating system’s crucial operations take place in kernel mode. User mode is the mode in which applications are operating, whereas kernel mode is the privileged state that the computer enters when accessing hardware resources. In this article, we will discuss the differences between user mode and kernel mode in detail.

What is User Mode?

In a running computer, for example, Windows, an application is started in user mode when the operating system boots up. A process and virtual address space (the address space for that process) are also created for a user-mode program by Windows when it requests to execute. Since they do not have direct access to the system resources, user-mode programs have fewer privileges than user-mode apps. For instance, using syscalls, the operating system kernel must first be accessed by a user-mode application if it needs to access system resources.

What is Kernel Mode?

The kernel is the central program on which all other operating system elements depend. It is used to access hardware components, plan which processes should execute on a computer system and when, and govern the interaction between application software and hardware. Because it can communicate directly with the hardware, it is the software with the greatest privileges. The CPU changes from user mode to kernel mode at the time of execution to handle requests for hardware access made by user mode programs, such as webcam access, which must first go through the kernel using a syscall. Once the process has finally finished running, the CPU returns to user mode.

Difference between User Mode and Kernel Mode in Tabular Form

BasisKernel ModeUser Mode
AccessIn this mode, only absolutely necessary functionality is allowed to function.For a specific system, user programs can access and run in this mode.
FunctionalityThe kernel mode is a very powerful and important mode since it has the ability to refer to any memory block in the system and control how instruction is executed by the CPU.The user mode is a conventional and common viewing mode, meaning that information cannot be executed independently or reference any memory block; it requires an Application Protocol Interface (API) to do so.
InterruptionsIf an interrupt happens in kernel mode, the entire operating system might crash.In user mode, if an interrupt happens, only one process fails.
Kernel-mode vs User modeThe software has direct, unfettered access to system resources while operating in kernel mode.The application program runs and launches in user mode.
Level of privilegeApplications have more rights in kernel mode than they have in user mode.The applications have lower privileges while operating in user mode.
Memory ReferencesIt has the ability to refer to both memory spaces.It is limited to using the memory set aside for user mode.
Mode bit valueThe kernel-mode mode bit is set to 0.While the user-mode mode's bit is set to 1.
ModesThe master mode, privileged mode, and system mode are further names for kernel mode.User mode is often referred to as restricted mode, slave mode, or unprivileged mode.
RestrictionsThere are no restrictions because kernel mode can access both user and kernel programs.While user mode requires access to kernel programs because it cannot do so directly.
System CrashKernel mode system crashes are severe and exacerbate matters.A system crash in user mode can be fixed by simply restarting the session.
Virtual address spaceEvery process in kernel mode uses the same virtual address space.All processes receive their own virtual address space in user mode.

Summary

A computer can run in kernel mode or user mode. User mode is the constrained mode in which applications are executing, whereas kernel mode is the privileged mode that the computer enters when accessing hardware resources. Between these two modes, the computer alternates. Although frequent context switches can slow down the performance, not all processes can be run in kernel mode. This is so that the operating system as a whole won't likely crash if one process fails.