# nuta/operating-system-in-1000-lines **Attribution required: if you use, quote, or summarise this content, you must credit and link back to [awesome-repositories.com](https://awesome-repositories.com/repository/nuta-operating-system-in-1000-lines).** 3,258 stars · 259 forks · C · other ## Links - GitHub: https://github.com/nuta/operating-system-in-1000-lines - Homepage: https://1000os.seiya.me - awesome-repositories: https://awesome-repositories.com/repository/nuta-operating-system-in-1000-lines.md ## Description This project is an educational operating system kernel designed to demonstrate the fundamental architectural principles of memory paging and process management. It is implemented as a minimal kernel that serves as a practical reference for building a functioning system from the ground up. The implementation features a preemptive multitasking kernel that switches execution contexts between threads to share a single CPU. It includes an x86 virtual memory manager that uses paging to map virtual addresses to physical memory and isolate processes. The system covers low-level hardware interfacing through disk drivers for raw read and write operations, as well as privilege-level mode separation to restrict user-mode execution. Interaction is handled via a text-based command line shell, and the project includes specialized techniques for low-level kernel debugging. ## Tags ### Operating Systems & Systems Programming - [Kernel Development](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-core-internals/kernel-development.md) — Provides a minimal kernel implementation to demonstrate core architectural principles like paging and scheduling. - [x86 Kernel Implementations](https://awesome-repositories.com/f/operating-systems-systems-programming/x86-kernel-implementations.md) — Implements a minimal x86 kernel demonstrating core principles such as memory paging and interrupt handling. ([source](https://cdn.jsdelivr.net/gh/nuta/operating-system-in-1000-lines@main/README.md)) - [Educational Kernel Projects](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-core-internals/kernel-development/educational-kernel-projects.md) — Serves as an educational project demonstrating the implementation of threading, scheduling, and memory protection. - [Context Switching Implementations](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-execution-context-layering/process-context-handlers/context-switching-implementations.md) — Provides the capability to swap execution states between tasks to allow shared CPU access. ([source](https://1000os.seiya.me/zh)) - [Educational Kernel Thread Implementations](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-process-internals/kernel-thread-distinctions/educational-kernel-thread-implementations.md) — Implements a multitasking system with kernel threads for educational demonstration of process switching. - [Kernel Shells](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-shells.md) — Ships a text-based command line shell for user interaction and kernel command execution. ([source](https://1000os.seiya.me/zh/)) - [Preemptive Multitasking Kernels](https://awesome-repositories.com/f/operating-systems-systems-programming/preemptive-multitasking-kernels.md) — Implements a kernel that switches process contexts between threads to enable shared CPU access. - [Privilege Level Management](https://awesome-repositories.com/f/operating-systems-systems-programming/privilege-level-management.md) — Manages processor execution levels to isolate user-mode applications from privileged kernel operations. - [Context Switching Mechanisms](https://awesome-repositories.com/f/operating-systems-systems-programming/task-priority-management/preemptive-scheduling/context-switching-mechanisms.md) — Implements CPU execution state swapping to enable preemptive multitasking across multiple threads. - [User-Mode Execution Environments](https://awesome-repositories.com/f/operating-systems-systems-programming/user-mode-drivers/user-mode-execution-environments.md) — Implements a restricted privilege level for applications to prevent interference with kernel operations. ([source](https://1000os.seiya.me/ja/)) - [Virtual Memory Management](https://awesome-repositories.com/f/operating-systems-systems-programming/virtual-memory-management.md) — Provides a system for managing virtual memory and mapping virtual addresses to physical memory locations. - [Disk Block I/O](https://awesome-repositories.com/f/operating-systems-systems-programming/disk-block-i-o.md) — Implements low-level synchronous data transfers between memory buffers and disk hardware controllers. - [Disk Device Drivers](https://awesome-repositories.com/f/operating-systems-systems-programming/disk-storage-internals/disk-device-drivers.md) — Provides low-level drivers for raw read and write operations on physical storage hardware. ([source](https://1000os.seiya.me/zh/)) - [Hardware Interfacing and Drivers](https://awesome-repositories.com/f/operating-systems-systems-programming/hardware-interfacing-drivers.md) — Implements drivers that facilitate direct communication between the kernel and physical disk hardware. - [Kernel Component Debugging](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-component-debugging.md) — Provides diagnostic workflows for troubleshooting driver-level code and kernel-mode memory management. - [File System I/O](https://awesome-repositories.com/f/operating-systems-systems-programming/kernel-core-internals/system-programming-primitives/system-primitives/file-system-i-o.md) — Provides the fundamental kernel capability to perform read and write operations on a structured file system. ([source](https://1000os.seiya.me/ko)) - [Low-Level Debuggers](https://awesome-repositories.com/f/operating-systems-systems-programming/low-level-debuggers.md) — Implements low-level debugging tools to identify errors in boot sequences and memory paging. ([source](https://1000os.seiya.me/ko)) - [Raw Block Device Writing](https://awesome-repositories.com/f/operating-systems-systems-programming/raw-block-device-writing.md) — Implements the ability to write binary data directly to physical disk blocks, bypassing the file system. ([source](https://1000os.seiya.me/en)) ### Development Tools & Productivity - [Monolithic Kernels](https://awesome-repositories.com/f/development-tools-productivity/platforms-runtimes-language-services/development-platforms/operating-system-environments/operating-systems/monolithic-kernels.md) — Implements a monolithic kernel where all core operating system services run in the privileged kernel space. ### Part of an Awesome List - [Command Line Shells](https://awesome-repositories.com/f/awesome-lists/devtools/command-line-shells.md) — Implements a custom command-line interpreter for interacting with the underlying kernel. - [Raw Disk Drivers](https://awesome-repositories.com/f/awesome-lists/learning/operating-systems-and-low-level/raw-disk-drivers.md) — Implements a hardware interface for raw read and write operations on physical storage devices.