diff --git a/include/asm/memory.h b/include/asm/memory.h
new file mode 100644
index 0000000..51b69e7
--- /dev/null
+++ b/include/asm/memory.h
@@ -0,0 +1,15 @@
+/*
+ *  NOTE!!! memcpy(dest,src,n) assumes ds=es=normal data segment. This
+ *  goes for all kernel functions (ds=es=kernel space, fs=local data,
+ *  gs=null), as well as for all well-behaving user programs (ds=es=
+ *  user data space). This is NOT a bug, as any user program that changes
+ *  es deserves to die if it isn't careful.
+ */
+#define memcpy(dest,src,n) ({ \
+void * _res = dest; \
+__asm__ ("cld;rep;movsb" \
+	::"D" ((long)(_res)),"S" ((long)(src)),"c" ((long) (n)) \
+	); \
+_res; \
+})
+