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diff --git a/sys/cddl/compat/opensolaris/sys/byteorder.h b/sys/cddl/compat/opensolaris/sys/byteorder.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
+/* All Rights Reserved */
+
+/*
+ * University Copyright- Copyright (c) 1982, 1986, 1988
+ * The Regents of the University of California
+ * All Rights Reserved
+ *
+ * University Acknowledgment- Portions of this document are derived from
+ * software developed by the University of California, Berkeley, and its
+ * contributors.
+ */
+
+#ifndef _OPENSOLARIS_SYS_BYTEORDER_H_
+#define _OPENSOLARIS_SYS_BYTEORDER_H_
+
+/*
+ * Macros to reverse byte order
+ */
+#define BSWAP_8(x) ((x) & 0xff)
+#define BSWAP_16(x) ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
+#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
+#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
+
+#define BMASK_8(x) ((x) & 0xff)
+#define BMASK_16(x) ((x) & 0xffff)
+#define BMASK_32(x) ((x) & 0xffffffff)
+#define BMASK_64(x) (x)
+
+/*
+ * Macros to convert from a specific byte order to/from native byte order
+ */
+#if _BYTE_ORDER == _BIG_ENDIAN
+#define LE_64(x) BSWAP_64(x)
+#else
+#define LE_64(x) BMASK_64(x)
+#endif
+
+#endif /* _OPENSOLARIS_SYS_BYTEORDER_H_ */