A learning by doing Operating System for x84_64 computers. Written in C and assembly (Intel Syntax)

This project uses Makefiles with gcc, binutils and nasm to compile.
Tools you need:

• gcc
• ld
• nasm
• objcopy
• qemu-system-x86_64

On arch linux:

sudo pacman -S gcc binutils nasm qemu-desktop

Build and run the project

$ make

Remove build files

$ make clean

Disassemble the operating system

$ make dis

The bootloader is located in the boot/ git submodule.

The kernel is located in the kernel/ directory.
kmain() is the kernel entry and is implemented in the file kernel/kernel.c

The drivers are located in the drivers/ directory.

The kernel may not have been loaded fully. Try increasing the number of loaded sectors in the boot/src/bootloader.asm file. It is recommended to set the register dh to x, with: x * 512 = sizeof(kernel.bin)

  mov si, init_msg
  call print

  ; HERE: (~line 30)
  mov dh, 3             ; load dh sectors
  mov dl, [BOOT_DRIVE]  ; select our boot drive
  mov bx, 0             ; set es indirectly to 0
  mov es, bx
  mov bx, KERNEL_OFFSET ; load it at address KERNEL_OFFSET
  call disk_load