#
# *** MAIN MAKE ***
#

ASM := nasm

ROOT_DIR ?= $(CUR_DIR)

SRC_DIR := $(ROOT_DIR)src
BUILD_DIR := $(ROOT_DIR)build

SRC_KERNEL_DIR := $(SRC_DIR)/kernel
SRC_LOADER_DIR := $(SRC_DIR)/bootldr

#
# KERNEL
#

.PHONY: kernel
kernel: always kernel.bin

kernel.bin:
	$(MAKE) -C $(SRC_KERNEL_DIR)

#
# BOOTLOADER
#

.PHONY: bootldr stage1 stage2
bootldr: always stage1 stage2 
stage1: $(BUILD_DIR)/bootloader.bin
stage2: $(BUILD_DIR)/stage2.bin

$(BUILD_DIR)/bootloader.bin:
	$(MAKE) -C $(SRC_LOADER_DIR)/1

$(BUILD_DIR)/stage2.bin:
	$(MAKE) -C $(SRC_LOADER_DIR)/2

#
# FLOPPY
#

.PHONY: floppy
floppy: $(BUILD_DIR)/floppy.img

$(BUILD_DIR)/floppy.img: kernel bootldr
	dd if=/dev/zero of=$(BUILD_DIR)/floppy.img bs=512 count=2880
	mkfs.fat -F 12 -n "" $(BUILD_DIR)/floppy.img
	dd if=$(BUILD_DIR)/bootloader.bin of=$(BUILD_DIR)/floppy.img conv=notrunc
	mmd -i $(BUILD_DIR)/floppy.img "::kernel"
	mcopy -i $(BUILD_DIR)/floppy.img $(BUILD_DIR)/kernel.bin "::kernel/kernel.bin"
	mcopy -i $(BUILD_DIR)/floppy.img $(BUILD_DIR)/stage2.bin "::stage2.bin"


#
# BUILD CONTROl
#

.PHONY: all run always clean 
all: floppy

run: all
	qemu-system-i386 -fda $(BUILD_DIR)/floppy.img

always:
	mkdir -p $(BUILD_DIR)

.PHONY: clean
clean:
	rm -rf $(BUILD_DIR)