BUILD_DIR = ./build

BOOT_ASM =./src/boot/bootloader.asm

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

KLIB_FILES = ./src/lib/string.c

KOBJ_LIBS = ./build/string.o

KOBJ_FILES = $(KERNEL_ASM_OBJ) \
	     $(KERNEL_OBJ) \
	     ./build/vga.o \
	     ./build/idt/idt.asm.o \
	     ./build/idt/idt.o \
	     ./build/io/io.asm.o \
	     ./build/mm/heap.o \
	     ./build/mm/kernel_heap.o \
	     ./build/mm/paging.asm.o \
	     ./build/mm/paging.o \
	     ./build/drivers/ata.o \
	     ./build/block/block.o \
	     ./build/fs/path.o


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) $(KOBJ_LIBS) -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 $(BOOT_TGT)

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

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

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

$(BUILD_DIR)/idt/idt.o: ./src/idt/idt.c ./build/vga.o $(KOBJ_LIBS)
	i686-elf-gcc $(INCLUDES) $(FLAGS) -std=gnu99 -c ./src/idt/idt.c -o $(BUILD_DIR)/idt/idt.o

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

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

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

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

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

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

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

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

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

clean:
	rm -f $(BOOT_TGT)
	rm -f bin/kernel.bin
	rm -f build/cemOS.o
	rm -f build/kernel.asm.o
	rm -f build/kernel.o
	rm -f build/vga.o
	rm -f build/string.o
	rm -f build/idt/idt.asm.o
	rm -f build/idt/idt.o
	rm -f build/io/io.asm.o
	rm -f build/mm/*.o
	rm -f build/drivers/*.o
	rm -f build/block/*.o
	rm -f build/fs/*.o
	rm -f bin/os.bin