KERNEL_FILE := hos.gz
MKISOFS     := genisoimage
ISO         := hos.iso
QEMU        := qemu-system-x86_64

# default target: build the kernel and ISO image
all: kernel iso

# build the kernel
.PHONY: kernel
kernel:
	$(MAKE) -C $@

# build the ISO image
.PHONY: iso
iso: $(ISO) kernel

$(ISO): kernel
	cp kernel/$(KERNEL_FILE) iso/boot
	-rm -f $(ISO)
	$(MKISOFS) -R -b boot/grub/stage2_eltorito -no-emul-boot \
		-boot-load-size 4 -boot-info-table -o $(ISO) iso

.PHONY: qemu
qemu: iso
	$(QEMU) -cdrom $(ISO) -boot d -m 384 -localtime

.PHONY: clean
clean:
	$(MAKE) -C kernel clean
	-rm -f $(ISO) iso/boot/$(KERNEL_FILE)