mit-pdos/xv6-riscv
Xv6 Riscv
xv6-riscv is a simplified Unix-like teaching operating system designed for the study of kernel design and hardware interaction. It provides a low-level RISC-V kernel implementation that serves as a bootable system image for execution and debugging within a virtual machine or emulator.
The project focuses on educational instruction regarding the RISC-V architecture. It enables the study of operating system concepts through a minimal kernel that implements process management and memory handling.
The system covers core kernel operations including multiprocessor resource management and the implementation of a file system. It includes a shell for command execution and a suite of utilities for file, directory, and text data processing.
The project includes a build system for generating kernel images and user-space binaries using a RISC-V cross-compiler toolchain.
Features
- Monolithic Kernels - Implements a monolithic kernel architecture where all core OS services run in a single privileged binary.
- RISC-V Kernel Implementations - Implements a low-level RISC-V kernel providing essential process and memory management.
- Filesystem Implementations - Provides a simplified file system implementation for studying on-disk data organization.
- Teaching Operating Systems - Provides a simplified Unix-like kernel specifically designed for studying operating system concepts.
- Operating Systems Study - Serves as an educational resource for studying the fundamentals of operating system design.
- File System Architectures - Implements a custom file system architecture using fixed-size blocks and inodes for data organization.
- Kernel Development - Offers a complete workflow for building and testing a RISC-V kernel from source.
- Operating System Kernels - Implements a minimal kernel designed for educational study of hardware and process management.
- Trap-Based Interfaces - Provides a system call interface based on hardware traps for transitioning from user mode to kernel mode.
- Memory Protection Managers - Provides hardware-enforced memory protection using page tables to isolate user processes from the kernel.
- Emulator Target Images - Provides a bootable RISC-V system image specifically designed for execution in virtual machines.
- System Emulators - Provides a target for system emulators to analyze the interaction between RISC-V hardware and the kernel.
- Virtual Machines - Designed to be executed within RISC-V virtual machines and emulators.
- Kernel Synchronization Primitives - Utilizes spinlocks as low-level synchronization primitives to manage shared data across multiple CPU cores.
- Kernel - Implements core kernel functions for multiprocessor resource handling and process scheduling.
- Kernel Build Systems - Ships a build system for compiling the kernel source into a bootable binary image.
- Shell Command Execution - Includes a shell capable of launching programs and managing process lifecycles.
- Disk Image File System Management - Includes tooling for generating bootable disk images containing the formatted file system.
- Bootable Image Creation - Provides utilities to create and format disk images for the operating system.
- Slab Allocators - Implements slab-style memory allocation using fixed-size chunks to prevent fragmentation within the kernel.
- System Resource Management - Implements functions for managing system resources across multiprocessor hardware.
- Remote Debugging Protocols - Supports remote kernel debugging via protocols that allow memory inspection and breakpoint management.
- User-Space Toolchains - Provides a toolchain to compile user-space programs linked against specific kernel memory layouts.
Star history
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