diff --git a/kern/libkern/stdalign.h b/kern/libkern/stdalign.h
new file mode 100644
index 0000000..6d64eb1
--- /dev/null
+++ b/kern/libkern/stdalign.h
@@ -0,0 +1,7 @@
+#ifndef STDALIGN_H
+#define STDALIGN_H
+
+#define ALIGN_UP(n, align)   (((n) + (align) - 1) & ~((align) - 1))
+#define ALIGN_DOWN(n, align) ((n) & ~((align) - 1))
+
+#endif // STDALIGN_H