CC=i586-elf-gcc
LD=i586-elf-ld
CFLAGS  = -Wall -nostdlib -nostdinc -ffreestanding -DKERNEL_SOS
LDFLAGS = --warn-common
OBJECTS = bootstrap/multiboot.o \
	  drivers/x86_videomem.o drivers/bochs.o \
	  sos/klibc.o sos/main.o

KERNEL_OBJ   = sos.elf
MULTIBOOT_IMAGE = cdrom.iso
PWD := $(shell pwd)

# Main target
all: $(MULTIBOOT_IMAGE)

$(MULTIBOOT_IMAGE): $(KERNEL_OBJ)
	# ./support/build_image.sh $@ $<
	if [ ! -e cdrom/boot/grub/stage2_eltorito ]; then \
		echo "Please copy grub's stage2_eltorito to cdrom/boot/grub."; \
		exit -1; \
	fi
	cp $(KERNEL_OBJ) cdrom
	echo timeout 0 > cdrom/boot/grub/menu.lst
	echo title Simple OS >> cdrom/boot/grub/menu.lst
	echo kernel /$(KERNEL_OBJ) >> cdrom/boot/grub/menu.lst
	genisoimage -R -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 \
	 -boot-info-table -input-charset ascii -A SOS -o $(MULTIBOOT_IMAGE) cdrom

$(KERNEL_OBJ): $(OBJECTS)
	$(LD) $(LDFLAGS) -T ./support/sos.lds -o $@ $^
	-nm -C $@ | cut -d ' ' -f 1,3 > sos.map

-include .mkvars

# Create objects from C source code
%.o: %.c
	$(CC) -I$(PWD) -c $< $(CFLAGS) -o $@

# Create objects from assembler (.S) source code
%.o: %.S
	$(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@

# Clean directory
clean:
	$(RM) *.iso *.img *.o mtoolsrc *~ menu.txt *.img *.elf *.bin *.map
	$(RM) *.log *.out bochs*
	$(RM) bootstrap/*.o bootstrap/*~
	$(RM) drivers/*.o drivers/*~
	$(RM) hwcore/*.o hwcore/*~
	$(RM) sos/*.o sos/*~
	$(RM) support/*~
	$(RM) extra/*~