Makefile

C_SOURCES = $(wildcard kernel/*/*.c)
ASM_SOURCES = $(wildcard kernel/*/*.asm)
C_OBJECTS = ${C_SOURCES:.c=.o}
ASM_OBJECTS = ${ASM_SOURCES:.asm=.o}

.PHONY : all assemble run clean

all: run

run : assemble
	qemu-system-i386 -drive format=raw,file=disk.img  -monitor stdio

debug: assemble
	qemu-system-i386 -s -hda disk.img &
	gdb -ex "target remote localhost:1234" -ex "symbol-file kernel/kernel.elf" -ex "b kmain" -ex "continue"

assemble: disk.img kernel.bin stage1.bin stage2.bin 
	dd if=stage1.bin of=disk.img bs=1 count=3 seek=0 skip=0 conv=notrunc
	dd if=stage1.bin of=disk.img bs=1 count=451 seek=62 skip=62 conv=notrunc
	mcopy -i disk.img stage2.bin kernel.bin ::  -D o


kernel.bin : kernel/kernel.elf  
	objcopy -O binary $^ $@
	chmod -x $@

#You can use the --print-map option to look at what the linker does
kernel/kernel.elf : $(C_OBJECTS) $(ASM_OBJECTS)
	i686-elf-ld  $^ -T kernel/linker.ld -e kmain -o $@ 
	chmod -x $@

%.o : %.c
	i686-elf-gcc -Ikernel/include -ffreestanding $< -c -o $@ -Wall -Werror -g 
%.o : %.asm
	nasm $< -o $@ -f elf32

stage1.bin : boot/stage1/stage1.asm
	nasm $^ -f bin -o $@
stage2.bin: boot/stage2/stage2.asm
	nasm $^ -f bin -o $@
	
disk.img: 
	truncate $@ -s 1M
	mkfs.vfat -F12 -S512 -s1 $@
	
clean :
	rm $(C_OBJECTS) $(ASM_OBJECTS) *.bin