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CC=i586-elf-gcc
LD=i586-elf-ld
CFLAGS  = -Wall -nostdlib -nostdinc -ffreestanding -DKERNEL_SOS
LDFLAGS = --warn-common
OBJECTS = bootstrap/multiboot.o                 \
          hwcore/idt.o hwcore/gdt.o             \
      hwcore/exception.o hwcore/exception_wrappers.o    \
      hwcore/irq.o hwcore/irq_wrappers.o hwcore/i8259.o \
      hwcore/i8254.o drivers/x86_videomem.o drivers/bochs.o \
      sos/physmem.o sos/klibc.o sos/main.o

KERNEL_OBJ   = sos.elf
MULTIBOOT_IMAGE = sos.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 \
        mkdir -p cdrom/boot/grub; \
        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) ./support/sos.lds
    $(LD) $(LDFLAGS) -T ./support/sos.lds -o $@ $(OBJECTS)
    -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 *.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/*~