Add a Makefile

Makefile

@@ -0,0 +1,36 @@
+arch ?= x86_64
+kernel := build/kernel-$(arch).bin
+iso := build/os-$(arch).iso
+
+linker_script := src/arch/$(arch)/linker.ld
+grub_cfg := src/arch/$(arch)/grub.cfg
+assembly_source_files := $(wildcard src/arch/$(arch)/*.asm)
+assembly_object_files := $(patsubst src/arch/$(arch)/%.asm, \
+	build/arch/$(arch)/%.o, $(assembly_source_files))
+
+.PHONY: all clean run iso
+
+all: $(kernel)
+
+clean:
+	@rm -r build
+
+run: $(iso)
+	@qemu-system-x86_64 -cdrom $(iso)
+
+iso: $(iso)
+
+$(iso): $(kernel) $(grub_cfg)
+	@mkdir -p build/isofiles/boot/grub
+	@cp $(kernel) build/isofiles/boot/kernel.bin
+	@cp $(grub_cfg) build/isofiles/boot/grub
+	@grub-mkrescue -o $(iso) build/isofiles 2> /dev/null
+	@rm -r build/isofiles
+
+$(kernel): $(assembly_object_files) $(linker_script)
+	@ld -n -T $(linker_script) -o $(kernel) $(assembly_object_files)
+
+# compile assembly files
+build/arch/$(arch)/%.o: src/arch/$(arch)/%.asm
+	@mkdir -p $(shell dirname $@)
+	@nasm -felf64 $< -o $@