What is NachOS?

• Not Another Completely Heuristic Operating System, or Nachos, is instructional software for teaching undergraduate, and potentially graduate level operating systems courses, Originally written in C++ for MIPS.
• Instead of running on physical machine, Nachos runs as a user-process on a host operating system.
• A MIPS simulator executes the code for any user programs running on top of the Nachos operating system.

Installing NachOS

• Nachos releases

  • Nachos runs on linux!

  Nachos

  • Nachos on ubuntu

  https://github.com/Universeyi/nachos-for-ubuntu

• Recommand: build in docker

  GitHub - YOUSIKI/Docker-Nachos: Nachos Compile & Run Environment in Docker

  1. Build docker container use dockerfile in the repo

     • Add install vim and wget in dockerfile first! Then build it

     ARG UPSTREAM_IMAGE=i386/ubuntu:bionic
     
     FROM ${UPSTREAM_IMAGE}
     
     ARG DOCKER_SHELL=bash
     ARG DOCKER_MIRROR
     
     # change apt mirror
     ADD scripts /scripts
     ADD mirrors /mirrors
     RUN /scripts/apt-mirror.sh
     
     # install compiler
     RUN apt update && \\
         apt install -y ed csh gdb build-essential vim wget && \\
         apt clean -y && \\
         rm -rf /var/lib/apt/lists/*
     
     # install shell
     RUN /scripts/install-shell.sh
     
     # change workspace
     WORKDIR /workspace
     
     ENTRYPOINT [ "/bin/myshell" ]
     
     

     • Build docker container

     docker buildx build -t nachos --build-arg DOCKER_SHELL=zsh .
     

  2. Go into docker container

     docker run -v $(pwd):/workspace -it nachos
     

  3. Install nachos4.0 from github

     git clone <https://github.com/Universeyi/nachos-for-ubuntu.git>
     

  4. Follow the steps in csdn

     <aside> <img src="/icons/info-alternate_blue.svg" alt="/icons/info-alternate_blue.svg" width="40px" />

     After cloning github, you should work in Nachos for Ubuntu folder

     cd nachos-for-ubuntu/NachOS4.1\\ for\\ ubuntu/
     

     </aside>

     [操作系统]Nachos4.1安装教程(docker+linux)_nachos安装教程-CSDN博客

  5. Install cross compiler and decompress it to / in container

     wget <https://github.com/chengscott-archive/nachos/raw/refs/heads/master/mips-decstation.linux-xgcc.gz>
     tar xvzf mips-decstation.linux-xgcc.gz -C /.
     

  6. Revise Makefile after configuration inside nachos-for-ubuntu/NachOS4.1 for ubuntu/coff2noff

     CC=gcc
     CFLAGS= -g -m32 -O2 -DRDATA -DHAVE_CONFIG_H -I@top_dir@  # adding -m32
     LD=gcc -m32  # adding -m32
     

• MacOS

  • Mac or windows user should use VirtualBox or other tools create a linux vm first, then build nachos on it

• Windows wsl2

  在Windows 10中使用WSL2安裝NachOS - HackMD

• Windows using virtualbox

  • Use VirtualBox or other tools create a linux vm first, then build nachos on it

  [作業系統] Nachos 安裝

Intro to Nachos

Nachos Chapter · Operating system concept

• A Roadmap to Nachos

  A Road Map Through Nachos

Nachos Assignments Implementation

• There are many kinds of assignment implementation on github, you can search on your own with keyword Nachos + assignment + github