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diff --git a/lib/libkse/arch/arm/include/atomic_ops.h b/lib/libkse/arch/arm/include/atomic_ops.h
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+++ b/lib/libkse/arch/arm/include/atomic_ops.h
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+/*-
+ * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>
+ * 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. Neither the name of the author nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_ATOMIC_OPS_H_
+#define	_ATOMIC_OPS_H_
+
+#include <machine/atomic.h>
+#include "thr_private.h"
+
+/*
+ * Atomic swap:
+ *   Atomic (tmp = *dst, *dst = val), then *res = tmp
+ *
+ * void atomic_swap32(intptr_t *dst, intptr_t val, intptr_t *res);
+ */
+static inline void
+atomic_swap32(volatile intptr_t *dst, intptr_t val, intptr_t *res)
+{
+	*res = __swp(val, dst);
+}
+
+#define	atomic_swap_ptr(d, v, r) \
+	atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r)
+
+#define	atomic_swap_int(d, v, r) \
+	atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r)
+#endif
+