An introduction to OS development

5th April 2017:

This simple UNIX-clone OS is an approach of OS development based on James Molloy's tutorial 'aims to take you through programming a simple UNIX-clone OS' that I have choose to follow in order to understand the basics concepts of POSIX and UNIX.

If you are reading this, you should take a look to this very good web site :

http://www.jamesmolloy.co.uk/tutorial_html/

For now, the project is just a school work and a simple verbatim of James Molloy's work. But, if you are interested in developing the subject, don't hesitate to contact me.

This readme could possibly change during the next weeks.

0. Remember that https://www.gnu.org/software/software.html is your friend !
1. Download GRUB (bootloader) : https://www.gnu.org/software/grub/
2. Install NASM : sudo apt-get install nasm
3. Install BOCHS (x86 emulator) : sudo apt-get install bochs You should then follow this steps :

   1. Create a disk image for the emulator. cd /opt/local/share/bochs$ sudo bximage (prompts will guide you) sudo chmod 777

   2. Remove the current 'ata0-master:' statement in /opt/local/share/bochs/bochsrc.txt and replace it with the 'ata0-master:' string displayed at the end of the bximage process.

   3. Format the disk image using FreeDOS (http://bochs.sourceforge.net/diskimages.html) according to the bochs documentation. (http://bochs.sourceforge.net/)

   4. Now start bochs from the command line.

0.Compile

''' cd src make clean make all cd .. '''

1.Create the disk image

''' sudo ./create_img.sh '''

2.Launch the OS with the shell script named qemu:

''' sudo ./qemu '''

3.When grub2 is started:

Select organix in Grub 2 menu entry.

http://www.jamesmolloy.co.uk/tutorial_html/ http://wiki.osdev.org/James_Molloy%27s_Tutorial_Known_Bugs http://rwth-os.github.io/eduOS/ https://www.gnu.org/software/grub/manual/grub.html http://www.osdever.net/bkerndev/index.php https://01.org/linuxgraphics/gfx-docs/drm/index.html https://01.org/linuxgraphics/gfx-docs/drm/process/coding-style.html http://www.eecg.toronto.edu/~amza/www.mindsec.com/files/x86regs.html http://www.cs.virginia.edu/~evans/cs216/guides/x86.html https://littleosbook.github.io/ https://github.com/berkus/jamesm-tutorials http://bochs.sourceforge.net/doc/docbook/user/bochsrc.html http://www.markomedia.com.au/load-kernel-and-boot-your-system-with-grub2/ http://www.pbm.com/~lindahl/real.programmers.html http://stackoverflow.com/questions/12982020/compiling-to-32-bit-using-make https://doc.ubuntu-fr.org/qemu https://github.com/roscopeco/mink https://roscopeco.com/ https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-828-operating-system-engineering-fall-2012/

0.Output implement vsprintf, printf 1.Memory management implement memcpy, memset