Makefile

SRC				= ./src
CONFIG			= ./config
BIN				= ./bin
ISO				= ./iso

# Main folders path
ENTRY			= $(SRC)/entry
UTILS			= $(SRC)/utils
BOOT			= $(SRC)/boot_sector
INTERRUPTS		= $(SRC)/interrupts
DRIVERS			= $(SRC)/drivers

# Kernel needed file(s)
KERNEL_BIN		= $(BIN)/kernel.bin
KERNEL_BUILD	= $(BIN)/kernelfull.o
OS_BIN			= $(ISO)/epi-os.iso

# Compilation tools (compiler, linker, etc..)
NASM			= nasm
CC				= i686-elf-gcc
LD				= i686-elf-ld

# Boot sector
BOOT_SRC		= $(BOOT)/boot_sector.asm
BOOT_BIN		= $(BIN)/boot.bin
BOOT_FLAGS		= -f bin

# Includes
INCLUDES		= -I $(SRC) -I $(UTILS)

# Flags
ASM_FLAGS		= -f elf
CFLAGS			= -g -ffreestanding $(INCLUDES)
LDFLAGS			= -Ttext 0x1000 --oformat binary

# Sources
ASM_SRC			= $(ENTRY)/entry_point.asm \
				  $(INTERRUPTS)/interrupts.asm 

C_SRC			= $(ENTRY)/kernel_entry.c \
				  $(UTILS)/VGA/clear.c \
				  $(UTILS)/VGA/print.c \
				  $(UTILS)/string/revstr.c \
				  $(UTILS)/string/itoa.c \
				  $(INTERRUPTS)/port.c \
				  $(INTERRUPTS)/idt.c \
				  $(INTERRUPTS)/isr.c \
				  $(INTERRUPTS)/pic.c \
				  $(INTERRUPTS)/timer.c \
				  $(DRIVERS)/keyboard/keyboard.c

# Objects
C_OBJ			= $(C_SRC:.c=.o)
ASM_OBJ			= $(ASM_SRC:.asm=.o)
KERNEL_OBJS		= $(ASM_OBJ) $(C_OBJ)


# Targets
all: build

build: boot_bin kernel_bin
	dd if=$(BOOT_BIN) 					>> $(OS_BIN)
	dd if=$(KERNEL_BIN) 				>> $(OS_BIN)
	dd if=/dev/zero bs=1048576 count=16 >> $(OS_BIN)

# Compile and launch QEMU
run:
	qemu-system-x86_64 -d int -no-reboot $(OS_BIN)

build_and_run: build run

boot_bin:
	$(NASM) $(BOOT_FLAGS) $(BOOT_SRC) -o $(BOOT_BIN)

kernel_bin: $(KERNEL_OBJS)
	$(LD) $(LDFLAGS) $(KERNEL_OBJS) -o $(KERNEL_BIN)

clean:
	$(RM) $(C_OBJ)
	$(RM) $(ASM_OBJ)
	$(RM) $(KERNEL_BIN)
	$(RM) $(BOOT_BIN)
	$(RM) $(KERNEL_BUILD)

fclean: clean
	$(RM) $(OS_BIN)

re: fclean all

# Compilations rules
%.o: %.c
	$(CC) $(CFLAGS) -c $< -o $@

%.o: %.asm
	$(NASM) $(ASM_FLAGS) $< -o $@

.PHONY: build run build_and_run boot_bin kernel_bin clean fclean re