verySimpleOS

x86_32 Kernel + Bootloader.

Run:

Image file in image/os-image

Run with QEMU(i386):

qemu-system-i386 -fda -m 64M image/os-image

Run with VirtualBox

• Use type Other
• Use version Other/Unkown
• Allocate atleast 64M of ram
• Set the iso image in image/os-image.iso in IDE Secondary Master storage device as a Live CD
• Boot the machine

Source:

• kernel/ contains all the kernel related files. kernel/k_exec.c contains the k_main function which gets executed on boot.
  • kernel/mmu Has physical frame management
  • kernel/paging Has VMM and paging
  • kernel/task Has processes
  • kernel/vsos.ld is the linker file for vSOS.
• libc/ contains all the standard C Libraries written for vSOS.
• boot/ contains files which help in booting up the OS. These include the bootloader, global descriptor table, protected mode switch and such.
• drivers/ contains drivers for hardware devices that vSOS supports.
• image/ contains the image for vSOS and compilation script.

Features* :

• Bootloader
• Hardware drivers
• Memory management and Paging
• Processes
• Interactive shell ... and more

Runs privilleged just like Terry Davis would have liked it

References:

• https://stanislavs.org/helppc/idx_interrupt.html
• https://wiki.osdev.org/Meaty_Skeleton
• https://www.udacity.com/course/introduction-to-operating-systems--ud923
• http://www.jamesmolloy.co.uk/tutorial_html/
• https://wiki.osdev.org/PIC
• https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf
• https://github.com/cfenollosa/os-tutorial
• Gemini, Claude, ChatGPT. Although they lie to me sometimes.