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Nachos Overview and Project 1

Nachos Overview and Project 1. Nachos Introduction. Official website http://homes.cs.washington.edu/~tom/nachos/ Nachos is instructional software for teaching undergraduate, and potentially graduate, level operating systems courses

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Nachos Overview and Project 1

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  1. Nachos Overview and Project 1

  2. Nachos Introduction • Officialwebsitehttp://homes.cs.washington.edu/~tom/nachos/ • Nachos is instructional software for teaching undergraduate, and potentially graduate, level operating systems courses • The only difference between Nachos and a real operating system is that Nachos runs a Unix process, whereas a real operating system runs on a real machine. • Nachos is simpler than UNIX. • Simulator makes debugging easier. • Deterministic

  3. Nachos installation on Ubuntu 13.04 (32bit) • Download the Nachos package and the cross compiler package from http://cc.ee.ntu.edu.tw/~farn/courses/OS/OS2013/index.htm • Install g++ and csh • sudo apt-get install g++ • sudo apt-get install csh • Untar packages • tar –zxvf nachos-4.0.tar • mv mips-x86.linux-xgcc.tar / • tar –zxvf /mips-x86.linux-xgcc.tar • Make • cd ~/nachos-4.0/code • make

  4. Project 1 • cd ./userprog • ./nachos –e ../test/test1 • Print integer:9 • Print integer:8 • Print integer:7 • Print integer:6 • ./nachos –e ../test/test2 • Print integer:20 • Print integer:21 • Print integer:22 • Print integer:23 • Print integer:24 • Print integer:25 • The programs execute correctly

  5. Project 1 • ./nachos –e ../test/test1 –e ../test/test2 • Print integer:9 • Print integer:8 • Print integer:7 • Print integer:20 • Print integer:21 • Print integer:22 • Print integer:23 • Print integer:24 • Print integer:6 • Print integer:7 • … • The result is wrong. And we are going to fix it.

  6. Trace code and fix the issue • Trace the following files and find out why the result is wrong • nachos-4.0/code/userprog/addrspace.h • nachos-4.0/code/userprog/addrspace.cc • nachos-4.0/code/userprog/userkernel.cc • nachos-4.0/code/userprog/translate.h • nachos-4.0/code/userprog/translate.cc • After you fix the bug, recompile Nachos and see if the result is correct.

  7. Hand in report • Code • tar zcvf b99xxxxxx.tar.gz ./nachos-4.0 • Report • Why the result is not congruent with expected • How you modified Nachos to make it support multiprogramming – important code segments • Mail your code and report to yyergg@gmail.com • Deadline Nov.12.2013

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