KERNEL_FILE := hos.gz
MKISOFS     := genisoimage
ISO         := hos.iso
QEMU        := qemu-system-x86_64
export PLATFORM := $(shell if [[ `uname` =~ "CYGWIN" ]]; then \
                             echo cygwin; \
                           else \
                             echo unix; \
                           fi)
ifeq ($(PLATFORM), cygwin)
export LD		:= i586-elf-ld
export CC		:= i586-elf-gcc
export CXX		:= i586-elf-g++
else
export LD      := ld
export CC      := gcc
export CXX     := g++
endif
export NASM    := nasm

# 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
	$(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)