Added makefiles

make/bios

@@ -0,0 +1,12 @@
+BIOS_SRC = ./bios
+STAGE3_BIN = $(BUILD_DIR)/stage3.elf
+
+$(BUILD_DIR)/bootloader.bin: $(wildcard $(BIOS_SRC)/*.asm) $(STAGE3_BIN)
+	@mkdir -p "$(BUILD_DIR)"
+	nasm \
+		-f bin \
+		-o "$@" \
+		-l "$@.lst" \
+		-D STAGE3="$(STAGE3_BIN)" \
+		-i "$(BIOS_SRC)" \
+		"$(BIOS_SRC)/bootloader.asm"