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diff --git a/usr/src/uts/sun4u/sys/cpu_impl.h b/usr/src/uts/sun4u/sys/cpu_impl.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 2006 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_CPU_IMPL_H
+#define _SYS_CPU_IMPL_H
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Definitions of UltraSparc III cpu implementations as specified
+ * in version register
+ */
+#define CHEETAH_IMPL 0x14
+#define IS_CHEETAH(impl) ((impl) == CHEETAH_IMPL)
+#define CHEETAH_MAJOR_VERSION(rev) (((rev) >> 4) & 0xf)
+#define CHEETAH_MINOR_VERSION(rev) ((rev) & 0xf)
+
+/*
+ * Definitions of UltraSPARC III+ cpu implementation as specified
+ * in version register
+ */
+#define CHEETAH_PLUS_IMPL 0x15
+#define IS_CHEETAH_PLUS(impl) ((impl) == CHEETAH_PLUS_IMPL)
+#define CHEETAH_PLUS_MAJOR_VERSION(rev) CHEETAH_MAJOR_VERSION(rev)
+#define CHEETAH_PLUS_MINOR_VERSION(rev) CHEETAH_MINOR_VERSION(rev)
+
+/*
+ * Definitions of UltraSPARC IIIi cpu implementation as specified
+ * in version register. Jalapeno major and minor rev's are in
+ * the same location and are the same size as Cheetah/Cheetah+.
+ */
+#define JALAPENO_IMPL 0x16
+#define IS_JALAPENO(impl) ((impl) == JALAPENO_IMPL)
+#define JALAPENO_MAJOR_VERSION(rev) CHEETAH_MAJOR_VERSION(rev)
+#define JALAPENO_MINOR_VERSION(rev) CHEETAH_MINOR_VERSION(rev)
+
+/*
+ * Definitions of UltraSPARC IV cpu implementation as specified
+ * in version register. Jaguar major and minor rev's are in
+ * the same location and are the same size as Cheetah/Cheetah+.
+ */
+#define JAGUAR_IMPL 0x18
+#define IS_JAGUAR(impl) ((impl) == JAGUAR_IMPL)
+#define JAGUAR_MAJOR_VERSION(rev) CHEETAH_MAJOR_VERSION(rev)
+#define JAGUAR_MINOR_VERSION(rev) CHEETAH_MINOR_VERSION(rev)
+
+/*
+ * Definitions of UltraSPARC IIIi+ cpu implementation as specified
+ * in version register. Serrano major and minor rev's are in
+ * the same location and are the same size as Cheetah/Cheetah+.
+ */
+#define SERRANO_IMPL 0x22
+#define IS_SERRANO(impl) ((impl) == SERRANO_IMPL)
+#define SERRANO_MAJOR_VERSION(rev) CHEETAH_MAJOR_VERSION(rev)
+#define SERRANO_MINOR_VERSION(rev) CHEETAH_MINOR_VERSION(rev)
+
+/*
+ * Definitions of UltraSPARC IV+ cpu implementation as specified
+ * in version register. Panther major and minor rev's are in
+ * the same location and are the same size as Cheetah/Cheetah+.
+ */
+#define PANTHER_IMPL 0x19
+#define IS_PANTHER(impl) ((impl) == PANTHER_IMPL)
+#define PANTHER_MAJOR_VERSION(rev) CHEETAH_MAJOR_VERSION(rev)
+#define PANTHER_MINOR_VERSION(rev) CHEETAH_MINOR_VERSION(rev)
+
+
+/*
+ * Definitions of Olympus-C cpu implementations as specified
+ * in version register
+ */
+#define OLYMPUS_C_IMPL 0x6
+#define IS_OLYMPUS_C(impl) ((impl) == OLYMPUS_C_IMPL)
+#define OLYMPUS_REV_MASK(x) (((x) >> 28) & 0x7)
+#define OLYMPUS_C_A 0
+
+#define CPU_IMPL_IS_CMP(impl) (IS_JAGUAR(impl) || \
+ IS_PANTHER(impl) || IS_OLYMPUS_C(impl))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_CPU_IMPL_H */