diff --git a/cppruntime/perm.hpp b/cppruntime/perm.hpp
new file mode 100644
index 0000000..20bb812
--- /dev/null
+++ b/cppruntime/perm.hpp
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <cstdint>
+
+
+namespace helos {
+
+// Permission on block devices and files, in all-right Unix fashion.
+// This must be in-line with MAP_PROT_EXEC/WRITE/READ and other Unix perms.
+typedef uint16_t     Permission;
+constexpr Permission PermExecute = 1 << 0;
+constexpr Permission PermWrite   = 1 << 1;
+constexpr Permission PermRead    = 1 << 2;
+
+
+} // namespace helos
diff --git a/cppruntime/runtime.hpp b/cppruntime/runtime.hpp
new file mode 100644
index 0000000..7535e72
--- /dev/null
+++ b/cppruntime/runtime.hpp
@@ -0,0 +1,5 @@
+#pragma once
+
+#include "../memory/memory.hpp"
+
+#include "perm.hpp"