BUILD_DIR = ./build

BOOT_ASM =./src/boot/bootloader.asm

KERNEL_ASM_OBJ = $(BUILD_DIR)/kernel.asm.o
KERNEL_OBJ = $(BUILD_DIR)/kernel.o
KOBJ_FILES = $(KERNEL_ASM_OBJ) $(KERNEL_OBJ)

BOOT_TGT =./bin/boot.bin
KERNEL_TGT = ./bin/kernel.bin
BIN_TGT = $(BOOT_TGT) $(KERNEL_TGT)

INCLUDES = -I./src/include
FLAGS = -g -ffreestanding -falign-jumps -falign-functions	\
	-falign-labels -falign-loops -fstrength-reduce		\
	-fomit-frame-pointer -finline-functions			\
	-Wno-unused-function -fno-builtin -Werror		\
	-Wno-unused-label -Wno-cpp -Wno-unused-parameter	\
	-nostdlib -nostartfiles -nodefaultlibs -Wall -O0 -Iinc	\



all: $(BIN_TGT)
	rm -rf ./bin/os.bin
	dd if=./bin/boot.bin >> ./bin/os.bin
	dd if=./bin/kernel.bin >> ./bin/os.bin
	dd if=/dev/zero bs=512 count=100 >> ./bin/os.bin
./bin/kernel.bin: $(KOBJ_FILES)
	i686-elf-ld -g -relocatable $(KOBJ_FILES) -o $(BUILD_DIR)/cemOS.o
	i686-elf-gcc $(FLAGS) -T ./src/linker.ld -o ./bin/kernel.bin -ffreestanding -O0 -nostdlib $(BUILD_DIR)/cemOS.o

./bin/boot.bin: $(BOOT_ASM)
	nasm -f bin $(BOOT_ASM) -o $(TARGET)

$(BUILD_DIR)/kernel.asm.o: ./src/kernel.asm
	nasm -f elf -g ./src/kernel.asm -o $(BUILD_DIR)/kernel.asm.o

$(BUILD_DIR)/kernel.o: ./src/kernel.c
	i686-elf-gcc $(INCLUDES) $(FLAGS) -std=gnu99 -c ./src/kernel.c -o $(BUILD_DIR)/kernel.o

clean:
	rm -f $(TARGET)
	rm -f bin/kernel.bin
	rm -f build/cemOS.o
	rm -f build/kernel.asm.o
	rm -f build/kernel.o
	rm -f bin/os.bin