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diff --git a/kern/rdxtree_i.h b/kern/rdxtree_i.h
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+/*
+ * Copyright (c) 2011-2015 Richard Braun.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * Upstream site with license notes :
+ * http://git.sceen.net/rbraun/librbraun.git/
+ */
+
+#ifndef _RDXTREE_I_H
+#define _RDXTREE_I_H
+
+/*
+ * Radix tree.
+ */
+struct rdxtree {
+    unsigned int height;
+    void *root;
+};
+
+/*
+ * Radix tree iterator.
+ *
+ * The node member refers to the node containing the current pointer, if any.
+ * The key member refers to the current pointer, and is valid if and only if
+ * rdxtree_walk() has been called at least once on the iterator.
+ */
+struct rdxtree_iter {
+    void *node;
+    rdxtree_key_t key;
+};
+
+/*
+ * Initialize an iterator.
+ */
+static inline void
+rdxtree_iter_init(struct rdxtree_iter *iter)
+{
+    iter->node = NULL;
+    iter->key = (rdxtree_key_t)-1;
+}
+
+int rdxtree_insert_common(struct rdxtree *tree, rdxtree_key_t key,
+                          void *ptr, void ***slotp);
+
+int rdxtree_insert_alloc_common(struct rdxtree *tree, void *ptr,
+                                rdxtree_key_t *keyp, void ***slotp);
+
+void * rdxtree_lookup_common(const struct rdxtree *tree, rdxtree_key_t key,
+                             int get_slot);
+
+void * rdxtree_walk(struct rdxtree *tree, struct rdxtree_iter *iter);
+
+#endif /* _RDXTREE_I_H */