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organix

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.

Setup:

  1. Remember that https://www.gnu.org/software/software.html is your friend !
  2. Download GRUB (bootloader) : https://www.gnu.org/software/grub/
  3. Install NASM : sudo apt-get install nasm
  4. 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.

Launch GRUB 2:

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.

External resources:

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/

TODO List

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