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  2. Monolithic kernel - Wikipedia

    en.wikipedia.org/wiki/Monolithic_kernel

    A monolithic kernel is an operating system architecture with the entire operating system running in kernel space. The monolithic model differs from other architectures such as the microkernel [1] [2] in that it alone defines a high-level virtual interface over computer hardware. A set of primitives or system calls implement all operating system ...

  3. Comparison of operating system kernels - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_operating...

    A kernel is a component of a computer operating system. [1] A comparison of system kernels can provide insight into the design and architectural choices made by the developers of particular operating systems.

  4. Kernel (operating system) - Wikipedia

    en.wikipedia.org/wiki/Kernel_(operating_system)

    In computing, a system call is how a process requests a service from an operating system's kernel that it does not normally have permission to run. System calls provide the interface between a process and the operating system. Most operations interacting with the system require permissions not available to a user-level process, e.g.,

  5. Tanenbaum–Torvalds debate - Wikipedia

    en.wikipedia.org/wiki/Tanenbaum–Torvalds_debate

    Graphic of a monolithic kernel running kernel space entirely in supervisor mode Microkernel architecture relies on user-space server programs. While the debate initially started out as relatively moderate, with both parties involved making only banal statements about kernel design, it grew progressively more detailed and sophisticated with every round of posts.

  6. Hybrid kernel - Wikipedia

    en.wikipedia.org/wiki/Hybrid_kernel

    The Windows NT operating system family's architecture consists of two layers (user mode and kernel mode), with many different modules within both of these layers.One prominent example of a hybrid kernel is the Microsoft Windows NT kernel that powers all operating systems in the Windows NT family, up to and including Windows 11 and Windows Server 2022, and powers Windows Phone 8, Windows Phone ...

  7. Comparison of operating systems - Wikipedia

    en.wikipedia.org/.../Comparison_of_operating_systems

    Typically the kernel implements processes but its code does not run as part of a process. [disputed – discuss] hybrid kernel monolithic kernel Nucleus In some operating systems there is OS code permanently present in a contiguous region of memory addressable by unprivileged code; in IBM systems this is typically referred to as the nucleus.

  8. Unix architecture - Wikipedia

    en.wikipedia.org/wiki/Unix_architecture

    Unix systems use a centralized operating system kernel which manages system and process activities. All non-kernel software is organized into separate, kernel-managed processes. Unix systems are preemptively multitasking : multiple processes can run at the same time, or within small time slices and nearly at the same time, and any process can ...

  9. CPU modes - Wikipedia

    en.wikipedia.org/wiki/CPU_modes

    Device drivers are designed to be part of the kernel due to the need for frequent I/O access. Multiple modes can be implemented, e.g. allowing a hypervisor to run multiple operating system supervisors beneath it, which is the basic design of many virtual machine systems available today.