Index: head/lib/libthr/arch/aarch64/include/pthread_md.h
===================================================================
--- head/lib/libthr/arch/aarch64/include/pthread_md.h
+++ head/lib/libthr/arch/aarch64/include/pthread_md.h
@@ -0,0 +1,84 @@
+/*-
+ * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
+ * Copyright (c) 2014 the FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Andrew Turner
+ * under sponsorship from the FreeBSD Foundation
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Machine-dependent thread prototypes/definitions.
+ */
+#ifndef _PTHREAD_MD_H_
+#define	_PTHREAD_MD_H_
+
+#include <sys/types.h>
+#include <machine/sysarch.h>
+#include <stddef.h>
+
+#define	CPU_SPINWAIT
+#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
+
+/*
+ * Variant I tcb. The structure layout is fixed, don't blindly
+ * change it.
+ */
+struct tcb {
+	void			*tcb_dtv;
+	struct pthread		*tcb_thread;
+};
+
+/* Called from the thread to set its private data. */
+static __inline void
+_tcb_set(struct tcb *tcb)
+{
+
+	__asm __volatile("msr	tpidr_el0, %x0" :: "r" (tcb));
+}
+
+/*
+ * Get the current tcb.
+ */
+static __inline struct tcb *
+_tcb_get(void)
+{
+	struct tcb *tcb;
+
+	__asm __volatile("mrs	%x0, tpidr_el0" : "=r" (tcb));
+	return (tcb);
+}
+
+extern struct pthread *_thr_initial;
+
+static __inline struct pthread *
+_get_curthread(void)
+{
+
+	return (_tcb_get()->tcb_thread);
+}
+
+#endif /* _PTHREAD_MD_H_ */