Makefile

NASM = /usr/bin/nasm
QEMU = qemu-system-i386
LD = /usr/local/i386elfgcc/bin/i386-elf-ld
CC = /usr/local/i386elfgcc/bin/i386-elf-gcc
GDB = /usr/local/i386elfgcc/bin/i386-elf-gdb
CFLAGS = -g

C_SOURCE = $(wildcard kernel/*.c drivers/*.c arch/x86/*.c)
C_HEADERS = $(wildcard kernel/*.h drivers/*.h arch/x86/*.h)
C_OBJ = ${C_SOURCE:.c=.o arch/x86/interrupt.o}

all: run

os-image.bin: boot/bootsect.bin kernel.bin 
	cat $^ > $@

# '--oformat binary' deletes all symbols as a collateral, so we don't need
# to 'strip' them manually on this case
kernel.bin: boot/kernel_entry.o ${C_OBJ}
	${LD} -o $@ -Ttext 0x1000 $^ --oformat binary

# Used for debugging purposes
kernel.elf: boot/kernel_entry.o ${C_OBJ}
	${LD} -o $@ -Ttext 0x1000 $^

run: os-image.bin
	${QEMU} -fda $<

debug: os-image.bin kernel.elf
	${QEMU} -s -fda $< &
	${GDB} -ex "target remote localhost:1234" -ex "symbol-file kernel.elf"
	kill `pidof ${QEMU}`

%.o : %.c ${C_HEADERS}
	${CC} ${CFLAGS} -DDEBUG -ffreestanding -c $< -o $@

%.o : %.asm
	${NASM} $< -f elf -o $@

%.bin : %.asm
	${NASM} $< -f bin -I '../../16bit/' -o $@
	
kernel_entry.o: kernel_entry.asm
	${NASM} $< -f elf -o $@

clean:
	rm -rf *.bin *.dis *.o os-image* *.elf
	rm -rf kernel/*.o boot/*.bin drivers/*.o boot/*.o arch/x86/*.o