sudofix/os161

ops-class.org OS/161 sources.

C

OS Lab Assignment

First Let's Create A Virtual Machine

Set Name, Operating System & Memory Size

Go Through The Installation Process

Now Lets Run Our Virtual Machine

First We Start Our Virtual Machine in The Background and Login to it

$ VBoxManage startvm lubuntu --type headless
$ ssh -p 3022 mohamed@localhost

Why Are We Doing This ?

So We Can Use Our Virtual Machine From Host Termnal

Now Let's Install Required Packages

Lets install Git so We Can Clone Repositories

$ sudo apt-get install git

and Let's Install Our C Compilers so we Can Use make and bmake Commands

$ sudo apt-get install build-essential

Now Let's Install os161-toolchain

$ sudo add-apt-repository ppa:ops-class/os161-toolchain
$ sudo apt-get update
$ sudo apt-get install os161-toolchain

Ok, Now Lets Clone os161 Repository Into Our src Directory
- note : i forked os161 repository to my github account so i can push the edits i make

$ git clone https://github.com/sudofix/os161 src

Now Let's Compile The Kernel

First we Configure our src Directory

$ cd ~/os161/src
$ ./configure

Now we Navigate to conf Directory and Configure it

$ cd ~/os161/src/kern/conf
$ ./config DUMBVM

Now we go to DUMBVM folder and compile it

$ cd ~/os161/src/kern/compile/DUMBVM
$ bmake depend
$ bmake
$ bmake install

Now Lets Run The Kernel

Navigate to root Folder and Download Configuration file for sys161

$ cd ~/os161/root
$ wget https://www.ops-class.org/files/sys161.conf

Now Let's Run The Kernel

$ sys161 kernel

Editing sys161 conf File

Lets Edit the conf File and Increase Ram and Decreaes CPUs

$ vim sys161.conf

As We Can See here 20MB is too large for memory

let's change it to 12MB

Making Edits

lets navigate to kern folder and create folder for our custom functions then create a C file to use for functions

$ cd ~/os161/src/kern
$ mkdir edits
$ touch info.c

now lets edit our info.c file

$ vim info.c

now lets navigate to include folder and create a header file and edit it

$ cd ~/os161/src/kern/include
$ touch info.h
$ vim info.h

now lets navigate to conf folder and add our C file in conf.kern file

cd ~/os161/src/kern/conf
$ vim conf.kern

now lets navigate to main folder and edit main.c
- so we first add oue header file, edit some info and call our function

$ cd ~/os161/src/kern/main
$ vim main.c

and let's edit version file to add our version

$ cd ~/os161/src/kern/include
$ vim version.c

Now lets build the kernel again

$ cd ~/os161/src/kern/compile/DUMBVM
$ bmake clean
$ bmake depend
$ bmake
$ bmake install

let's run the kernel again to see our modifications

$ cd ~/os161/root
$ sys161 kernel

Extra Modifications

Now i'm Going To Add To Functions two Our Kernel Menu. One is a Simple Calculator and The Other is an info one

First Lets Create Our 2 Functions in info.c file we created earlier

now we add our function prototypes in our header file info.h

now let's include our info.c in menu.c

we add auxiliary functions in the commands table

we implement the auxiliary functions

add options for our fucntion to menu

and now let's recompile the kernel and see our new functions in the menu

let's try our calculator

and let's try the other function