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.DEFAULT_GOAL := os.iso
.PHONY: demo
OBJECTS=entry.o kernel.o
KERNEL_BUILD_FLAGS=-std=c99 -ffreestanding -O0 -Wall -Wextra
OS_BUILD_FLAGS=-ffreestanding -O2 -nostdlib -lgcc
entry.o: boot.asm
nasm -felf32 boot.asm -o entry.o
kernel.o: kernel.c
i386-elf-gcc -c kernel.c -o kernel.o $(KERNEL_BUILD_FLAGS)
os.bin: kernel.o entry.o
i386-elf-gcc -T linker.ld -o os.bin $(OS_BUILD_FLAGS) $(OBJECTS)
os.iso: os.bin
mkdir -p iso/boot/grub
cp os.bin iso/boot/os.bin
printf "menuentry 'HelloOS' {\n multiboot /boot/os.bin\n set gfxpayload=text\n}" > iso/boot/grub/grub.cfg
grub-mkrescue -o os.iso iso
demo:
qemu-system-i386 demo/os.iso
run: os.iso
qemu-system-i386 os.iso
clean:
rm -rf iso os.iso *.o *.bin
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