# Variables
ASM = nasm
CC = gcc
LD = ld
QEMU = qemu-system-x86_64

# Flags
CFLAGS = -m32 -ffreestanding -fno-pie -fno-stack-protector -mno-sse -mno-mmx -mno-sse2 -c
LDFLAGS = -m elf_i386 -T link.ld --oformat binary

# Objects
OBJS = entry.o kmain.o idt.o interrupts.o keyboard.o shell.o

# Targets
all: os-image.bin

os-image.bin: boot.bin kernel.bin
	cat $^ > $@
	truncate -s 10k $@

boot.bin: boot.asm
	$(ASM) $< -f bin -o $@

kernel.bin: $(OBJS)
	$(LD) $(LDFLAGS) -o $@ $^

entry.o: entry.asm
	$(ASM) $< -f elf -o $@

interrupts.o: interrupts.asm
	$(ASM) $< -f elf -o $@

%.o: %.c
	$(CC) $(CFLAGS) $< -o $@

run: os-image.bin
	$(QEMU) -drive format=raw,file=$<

clean:
	rm -f *.bin *.o