diff --git a/LICENSE b/LICENSE
index d363ac6..d06b306 100644
--- a/LICENSE
+++ b/LICENSE
@@ -38,3 +38,17 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
+ck_pr_rtm leverages work from Andi Kleen:
+Copyright (c) 2012,2013 Intel Corporation
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that: (1) source code distributions
+retain the above copyright notice and this paragraph in its entirety, (2)
+distributions including binary code include the above copyright notice and
+this paragraph in its entirety in the documentation or other materials
+provided with the distribution
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
diff --git a/configure b/configure
index 52bec46..672b5bc 100755
--- a/configure
+++ b/configure
@@ -94,6 +94,7 @@ generate()
 	    -e "s#@GZIP@#$GZIP#g"				\
 	    -e "s#@GZIP_SUFFIX@#$GZIP_SUFFIX#g"			\
 	    -e "s#@POINTER_PACK_ENABLE@#$POINTER_PACK_ENABLE#g"	\
+	    -e "s#@RTM_ENABLE@#$RTM_ENABLE#g"			\
 	    -e "s#@VMA_BITS@#$VMA_BITS_R#g"			\
 	    -e "s#@VMA_BITS_VALUE@#$VMA_BITS_VALUE_R#g"		\
 	    -e "s#@MM@#$MM#g"					\
@@ -122,6 +123,7 @@ generate_stdout()
 	echo "      POINTER_PACK = $POINTER_PACK_ENABLE"
 	echo "          VMA_BITS = $VMA_BITS"
 	echo "      MEMORY_MODEL = $MM"
+	echo "               RTM = $RTM_ENABLE"
 	echo
 	echo "Headers will be installed in $HEADERS"
 	echo "Libraries will be installed in $LIBRARY"
@@ -147,6 +149,7 @@ for option in $*; do
 		echo "The following options will modify code generation."
 		echo "  --cores=N                Specify number of cores available on target machine"
 		echo "  --enable-pointer-packing Assumes address encoding is subset of pointer range"
+		echo "  --enable-rtm             Enable restricted transactional memory (x86_64 only)"
 		echo "  --memory-model=N         Specify memory model (currently tso, pso or rmo)"
 		echo "  --vma-bits=N             Specify valid number of VMA bits"
 		echo
@@ -182,6 +185,9 @@ for option in $*; do
 	--enable-pointer-packing)
 		POINTER_PACK_ENABLE="CK_MD_POINTER_PACK_ENABLE"
 		;;
+	--enable-rtm)
+		RTM_ENABLE_SET="CK_MD_RTM_ENABLE"
+		;;
 	--cores=*)
 		CORES=$value
 		;;
@@ -354,6 +360,7 @@ case $PLATFORM in
 		esac
 		;;
 	"amd64"|"x86_64")
+		RTM_ENABLE=${RTM_ENABLE_SET:-"CK_MD_RTM_DISABLE"}
 		PLATFORM=x86_64
 		ENVIRONMENT=64
 		LDFLAGS="-m64 $LDFLAGS"
@@ -364,6 +371,7 @@ case $PLATFORM in
 		ISA=`isainfo -n 2> /dev/null || echo i386`
 		case "$ISA" in
 			"amd64")
+				RTM_ENABLE=${RTM_ENABLE_SET:-"CK_MD_RTM_DISABLE"}
 				PLATFORM=x86_64
 				ENVIRONMENT=64
 				;;
diff --git a/include/ck_md.h.in b/include/ck_md.h.in
index 4977c00..4449cf8 100644
--- a/include/ck_md.h.in
+++ b/include/ck_md.h.in
@@ -35,6 +35,10 @@
 #define CK_MD_PAGESIZE (4096)
 #endif
 
+#ifndef @RTM_ENABLE@
+#define @RTM_ENABLE@
+#endif /* @RTM_ENABLE@ */
+
 #ifndef @POINTER_PACK_ENABLE@
 #define @POINTER_PACK_ENABLE@
 #endif /* @POINTER_PACK_ENABLE@ */
diff --git a/include/gcc/x86_64/ck_pr.h b/include/gcc/x86_64/ck_pr.h
index 524b45e..df52117 100644
--- a/include/gcc/x86_64/ck_pr.h
+++ b/include/gcc/x86_64/ck_pr.h
@@ -42,6 +42,13 @@
  */
 #include "ck_f_pr.h"
 
+/*
+ * Support for TSX extensions.
+ */
+#ifdef CK_MD_RTM_ENABLE
+#include "ck_pr_rtm.h"
+#endif
+
 /* Minimum requirements for the CK_PR interface are met. */
 #define CK_F_PR
 
diff --git a/include/gcc/x86_64/ck_pr_rtm.h b/include/gcc/x86_64/ck_pr_rtm.h
new file mode 100644
index 0000000..889efc1
--- /dev/null
+++ b/include/gcc/x86_64/ck_pr_rtm.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2013 Samy Al Bahra.
+ * 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 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.
+ */
+
+/*
+ * Copyright (c) 2012,2013 Intel Corporation
+ * Author: Andi Kleen
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef _CK_PR_X86_64_RTM_H
+#define _CK_PR_X86_64_RTM_H
+
+#ifndef _CK_PR_X86_64_H
+#error Do not include this file directly, use ck_pr.h
+#endif
+
+#define CK_F_PR_RTM
+
+#include <ck_cc.h>
+#include <stdbool.h>
+
+#define CK_PR_RTM_STARTED	(~0U)
+#define CK_PR_RTM_EXPLICIT	(1 << 0)
+#define CK_PR_RTM_RETRY		(1 << 1)
+#define CK_PR_RTM_CONFLICT	(1 << 2)
+#define CK_PR_RTM_CAPACITY	(1 << 3)
+#define CK_PR_RTM_DEBUG		(1 << 4)
+#define CK_PR_RTM_NESTED	(1 << 5)
+#define CK_PR_RTM_CODE(x)	(((x) >> 24) & 0xFF)
+
+CK_CC_INLINE static unsigned int
+ck_pr_rtm_begin(void)
+{
+	unsigned int r = CK_PR_RTM_STARTED;
+
+	__asm__ __volatile__(".byte 0xc7,0xf8;"
+			     ".long 0;"
+				: "+a" (r)
+				:
+				: "memory");
+
+	return r;
+}
+
+CK_CC_INLINE static void
+ck_pr_rtm_end(void)
+{
+
+	__asm__ __volatile__(".byte 0x0f,0x01,0xd5" ::: "memory");
+	return;
+}
+
+CK_CC_INLINE static void
+ck_pr_rtm_abort(const unsigned int status)
+{
+
+	__asm__ __volatile__(".byte 0xc6,0xf8,%P0" :: "i" (status) : "memory");
+	return;
+}
+
+CK_CC_INLINE static bool
+ck_pr_rtm_test(void)
+{
+	bool r;
+
+	__asm__ __volatile__(".byte 0x0f,0x01,0xd6;"
+			     "setnz %0"
+				: "=r" (out)
+				:
+				: "memory");
+
+	return r;
+}
+
+#endif /* _CK_PR_X86_64_RTM_H */
+