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Index: head/lib/libthr/arch/riscv/include/pthread_md.h
===================================================================
--- head/lib/libthr/arch/riscv/include/pthread_md.h
+++ head/lib/libthr/arch/riscv/include/pthread_md.h
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * Portions of this software were developed by SRI International and the
+ * University of Cambridge Computer Laboratory under DARPA/AFRL contract
+ * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Portions of this software were developed by the University of Cambridge
+ * Computer Laboratory as part of the CTSRD Project, with support from the
+ * UK Higher Education Innovation Fund (HEIF).
+ *
+ * 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 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Machine-dependent thread prototypes/definitions.
+ */
+#ifndef _PTHREAD_MD_H_
+#define _PTHREAD_MD_H_
+
+#include <sys/types.h>
+#include <stddef.h>
+
+#define CPU_SPINWAIT
+#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
+#define TP_OFFSET 0x10
+
+/*
+ * 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("mv tp, %0" :: "r"((uint8_t *)tcb + TP_OFFSET));
+}
+
+/*
+ * Get the current tcb.
+ */
+static __inline struct tcb *
+_tcb_get(void)
+{
+ register uint8_t *_tp;
+
+ __asm __volatile("mv %0, tp" : "=r"(_tp));
+
+ return ((struct tcb *)(_tp - TP_OFFSET));
+}
+
+extern struct pthread *_thr_initial;
+
+static __inline struct pthread *
+_get_curthread(void)
+{
+
+ if (_thr_initial)
+ return (_tcb_get()->tcb_thread);
+ return (NULL);
+}
+
+#endif /* _PTHREAD_MD_H_ */

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