Nachos Introduction

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Nachos Introduction

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Nachos

• Nachos
• Not Another Completely Heuristic Operating
  System
• Written by Tom Anderson and his students at UC
  Berkeley
• http//www.cs.washington.edu/homes/tom/nachos/

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Nachos 4.0

• An educational OS used to
• teach monolithic kernel design and implementation
• do experiments
• Fact
• Real hardware is difficult to handle.
• May break if handled wrong.
• Approach
• Use a virtual MIPS machine
• Provide some basic OS elements

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Nachos 4.0
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Nachos 4.0

• Simulates MIPS architecture on host system
• (Unix /Linux/ Windows / MacOS X )
• User programs need a cross-compiler (target MIPS)
  
• Nachos appears as a single threaded process to
  the host operating system

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Recommended Platform

• Redhat Linux 7.3
• Install linux directly on your pc.
• Install linux on virtual machine.
• http//www.vmware.com/
• http//www.connectix.com/

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Nachos content
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How does it work?(1)
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How does it work?(2)
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How does it work?(3)
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Setup the System

• Get tar-ball from our site
• OS nachos_40.tar.gz
• Cross Compiler mips-decstation.linux-xgcc.tgz
• Untar the files
• tar zxvf nachos_40.tar.gz
• tar zxvf mips-decstation.linux-xgcc.tgz
• Move usr directory to /.
• move ./usr /

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Setup the System (cont.)

• Make OS
• cd NachOS-4.0/code/bulid.linux
• make depend
• make
• cd ../coff2noff
• make

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Test the OS environment

• Compile test file
• cd ../code/test
• make

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How to Start Trace Codes

• Read interfaces in the .h files first.
• To have overview of the whole system.
• Then ,read the implementations in the .cc files.
• See how the executable code supports each
  interface.
• Documentation
• http//www.cs.duke.edu/narten/110/nachos/main/mai
  n.html