Custom OS for x86 PC arch. Only Prints "Hello"
There is a standard for loading various x86 kernels using a boot loader; called as Multiboot specification. GRUB will only load our kernel if it complies with the Multiboot spec.
assemble boot part of kernel
$ as --32 boot.s -o boot.o
Compile kernel.c file
$ gcc -m32 -c kernel.c -o kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra
Linkinng compiled file
$ ld -m elf_i386 boot.o kernel.o -nostdlib -T linker.ld -o FFFF.bin
Make a ISO file including .bin file
$ mkdir -p iso/boot/grub
$ cp FFFF.bin iso/boot/FFFF.bin
$ cp grub.cfg iso/boot/grub/grub.cfg
$ grub-mkrescue -o FFFF.iso iso
How to RUN.
- You can download ISO file and use Oracle VM
- Use QEMU.
qemu-system-x86_64 -cdrom FFFF.iso
Here is screeshots.
