An attempt at a homemade OS kernel, using wiki.OSDev.org and the necessary docs. I'm making this to learn more about OS dev and the secret low level computer shenanigans.

• GCC cross-compiler
• Grub bootloader
  • Bootloader.asm
    • grub-file --is-x86-multiboot
    • Actually test it
      • Set up QEMU and GDB
      • Link kernel and bootloader (link NASM asm and GCC C.)
        • Get it to work
        • Understand how it works and customise
• Interrupts
  • GDT
  • IDT
• [ ]
• Video
  • Basic VGA video for basic debug
  • GPU stuff
    • kms
• Use a makefile instead of a bash script

xxd
-b (binary dump)
-c 8 (show address every 8 bytes (column size))

x86 is little endian. 0x1234 -> 0x34 0x12

i686-elf-gcc -c src/kernel.c -o target/kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra
nasm -f elf32 src/multiboot.asm -o target/multiboot.o
# Link
i686-elf-gcc -T src/linker_script.ld -o target/myos.bin -ffreestanding -O2 -nostdlib target/multiboot.o target/kernel.o -lgcc

Build a cross-compiler.

gcc 14.2.0 compiled with 15.1.1

binutils 2.43.1 compiled with gcc 15.1.1

run compile.sh

• grub-iso/ directory used to create the grub bootable image with grub-mkrescue
• kernel_drivers/ directory for hardcoded kernel drivers.