CC = i686-elf-gcc
LD = i686-elf-ld
OBJCOPY = i686-elf-objcopy

CFLAGS = -m32 -ffreestanding -O2 -Wall -Wextra -nostdlib
ASFLAGS = -m32

.PHONY: all clean run

all: os.img

boot.o: boot.s 
	$(CC) $(ASFLAGS) -c boot.s -o boot.o

boot.elf: boot.o boot.ld 
	$(LD) -T boot.ld -o boot.elf boot.o

boot.bin: boot.elf 
	$(OBJCOPY) -O binary boot.elf boot.bin

prekernel.o: prekernel.s
	$(CC) $(ASFLAGS) -c prekernel.s -o prekernel.o

kmain.o: kmain.c
	$(CC) $(CFLAGS) -c kmain.c -o kmain.o

kernel.elf: prekernel.o kmain.o kernel.ld
	$(LD) -T kernel.ld -o kernel.elf prekernel.o kmain.o

kernel.bin: kernel.elf
	$(OBJCOPY) -O binary kernel.elf kernel.bin

os.img: boot.bin kernel.bin
	dd if=boot.bin of=os.img bs=512 count=1
	dd if=kernel.bin of=os.img bs=512 seek=1
	truncate -s 1440k os.img

run: os.img
	qemu-system-i386 -drive format=raw,file=os.img

clean: 
	rm -f *.o *.elf *.bin os.img