Top level makefile. Also make clean

Makefile

@@ -0,0 +1,17 @@
+ifeq ($(MITTOS64),)
+$(error Unsupported environment! See README)
+endif
+
+.PHONY: kernel clean
+
+all: kernel
+
+kernel:
+ifeq ($(shell make -sqC src/kernel || echo 1), 1)
+	$(MAKE) -C src/kernel install
+endif
+
+clean:
+	$(MAKE) -C src/kernel clean
+	rm -rf sysroot
+

src/kernel/Makefile

@@ -15,5 +15,16 @@ all: kernel
 kernel: LDFLAGS += -n -nostdlib -T Link.ld
 kernel: $(OBJ)
 	$(LINK.c) $^ -o $@
+
+
+# Copy kernel to sysroot
+/opt/sysroot/kernel: kernel
 	mkdir -p /opt/sysroot
 	cp kernel /opt/sysroot/kernel
+
+install: /opt/sysroot/kernel
+
+clean:
+	rm -rf $(OBJ) kernel
+
+.PHONY: install