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diff --git a/usr/src/uts/sun4v/sys/mpo.h b/usr/src/uts/sun4v/sys/mpo.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 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_MPO_H
+#define	_SYS_MPO_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * mpo.h -  Sun4v MPO common header file
+ *
+ */
+#define	MPO_MAX_MBLOCKS		16
+#define	MAX_MEM_STRIPES	(MAX_MEM_NODES * MPO_MAX_MBLOCKS)
+
+#define	PROP_LG_CPU_ID	"id"
+#define	PROP_LG_MASK	"address-mask"
+#define	PROP_LG_LATENCY "latency"
+#define	PROP_LG_MATCH	"address-match"
+#define	PROP_LG_MEM_LG	"memory-latency-group"
+#define	PROP_LG_CPU	"cpu"
+#define	PROP_LG_MBLOCK	"mblock"
+#define	PROP_LG_BASE	"base"
+#define	PROP_LG_SIZE	"size"
+#define	PROP_LG_RA_PA_OFFSET	"address-congruence-offset"
+
+/* Macro to set the correspending bit if an mem-lg homeid is a member */
+#define	HOMESET_ADD(homeset, home)\
+	homeset |= ((int)1 << (home))
+
+/* Macro to check if an mem_lg homeid is a member of the homeset */
+#define	MEM_LG_ISMEMBER(homeset, home)\
+	((homeset) & ((uint64_t)1 << (home)))
+
+/* Structure to store CPU information from the MD */
+
+struct cpu_md {
+	uint_t 	home;
+	uint64_t  latency;
+};
+
+/* Structure to store mem-lg information from the MD */
+
+struct lgrp_md {
+	uint64_t	id;
+	uint64_t	addr_mask;
+	uint64_t	addr_match;
+	uint64_t	latency;
+	mde_cookie_t	node;
+	int		ncpu;
+};
+
+/* Structure to store mblock information retrieved from the MD */
+
+struct mblock_md {
+	uint64_t	base;
+	uint64_t	size;
+	uint64_t	ra_to_pa;
+	mde_cookie_t	node;
+	pfn_t		base_pfn;
+	pfn_t		end_pfn;
+};
+
+/* Structure for memnode information for use by plat_pfn_to_mem_node */
+
+struct mnode_info {
+	pfn_t		base_pfn;
+	pfn_t		end_pfn;
+};
+
+/* A stripe defines the portion of a mem_node that falls in one mblock */
+typedef struct {
+	pfn_t physbase;	/* first page in mnode in the corresponding mblock */
+	pfn_t physmax;	/* last valid page in mnode in mblock */
+	pfn_t offset;   /* stripe starts at physbase - offset */
+	int exists;	/* set to 1 if mblock has memory in this mnode stripe */
+} mem_stripe_t;
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_MPO_H */