Simple OS for the i386 architecture

To Do

Main Goals

• Boot + Hello World
• Call C code from assembly
• Framebuffer driver
• Serial port driver
• Segmentation
• Interrupt handling
  • Register interrupt handlers by interrupt number
  • Setup timer interrupt handler
• Keyboard driver
• Run GRUB modules
• Enable paging
• Page frame allocation
• Create kernel heap
• Running C programs in User Mode
• Implement filesystem
• System calls
• Implement process scheduling

Stretch Goals

• Simple shell
• File editor

Side Quests:

• Better logging / printing
  • newline characters
  • colors
  • log levels
• Util file:
  • itoa
  • str_reverse

Development requirements

Install dependencies:

sudo apt install build-essential nasm genisoimage bochs bochs-sdl bochs-x

Launch the os

Make

Make run

Manual

Generate loader.o: nasm -f elf32 loader.s

Link kernel.elf executable: ld -T link.ld -melf_i386 loader.o -o kernel.elf

Generate iso image:

genisoimage -R                              \
            -b boot/grub/stage2_eltorito    \
            -no-emul-boot                   \
            -boot-load-size 4               \
            -A os                           \
            -input-charset utf8             \
            -quiet                          \
            -boot-info-table                \
            -o os.iso                       \
            iso

Run Bochs: bochs -f bochsrc.txt -q