initial commit

Makefile

@@ -0,0 +1,43 @@
+src_dir := src
+build_dir := build
+
+asm := nasm
+
+qemu := qemu-system-i386
+qemu_flags := -drive file=$(build_dir)/rainbowboot.img,format=raw
+qemu_flags_gdb := -s -S
+
+dosbox := dosbox
+
+.PHONY: all run run-gdb run-dosbox attach clean
+
+all: $(build_dir)/rainbowboot.img
+
+run: $(build_dir)/rainbowboot.img
+	$(qemu) $(qemu_flags)
+
+run-gdb: $(build_dir)/rainbowboot.img
+	$(qemu) $(qemu_flags_gdb) $(qemu_flags)
+
+run-dosbox: $(build_dir)/rainbowboot.img
+	$(dosbox) -c "BOOT $(build_dir)/rainbowboot.img"
+
+attach: $(build_dir)/rainbowboot.elf
+	gdb $(build_dir)/rainbowboot.elf \
+		-ex "target remote localhost:1234" \
+		-ex "set architecture i8086"
+
+clean:
+	rm -rf $(build_dir)
+
+$(build_dir)/rainbowboot.img: $(build_dir)/rainbowboot.elf | $(build_dir)
+	objcopy -O binary $(build_dir)/rainbowboot.elf $(build_dir)/rainbowboot.img
+
+$(build_dir)/rainbowboot.elf: $(build_dir)/rainbowboot.o | $(build_dir)
+	ld -Ttext=0x7c00 -melf_i386 $(build_dir)/rainbowboot.o -o $(build_dir)/rainbowboot.elf
+
+$(build_dir)/rainbowboot.o: $(src_dir)/rainbowboot.s | $(build_dir)
+	$(asm) -f elf32 -g3 -F dwarf $(src_dir)/rainbowboot.s -o $(build_dir)/rainbowboot.o
+
+$(build_dir):
+	mkdir -p $(build_dir)