Move source into subdirectory

mm/include/stack.h

@@ -0,0 +1,12 @@
+#ifndef STACK_H
+#define STACK_H
+
+#include "alignment.h"
+
+#define STACK(stack, size) \
+    u64 stack[ALIGN8(size) / sizeof(u64)]
+
+#define STACK_TOP(stack) \
+    ((u8*)(stack) + sizeof(stack))
+
+#endif