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diff --git a/include/asm-ia64/sn/nodepda.h b/include/asm-ia64/sn/nodepda.h
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+++ b/include/asm-ia64/sn/nodepda.h
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 - 1997, 2000-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+#ifndef _ASM_IA64_SN_NODEPDA_H
+#define _ASM_IA64_SN_NODEPDA_H
+
+
+#include <asm/semaphore.h>
+#include <asm/irq.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/pda.h>
+#include <asm/sn/bte.h>
+
+/*
+ * NUMA Node-Specific Data structures are defined in this file.
+ * In particular, this is the location of the node PDA.
+ * A pointer to the right node PDA is saved in each CPU PDA.
+ */
+
+/*
+ * Node-specific data structure.
+ *
+ * One of these structures is allocated on each node of a NUMA system.
+ *
+ * This structure provides a convenient way of keeping together 
+ * all per-node data structures. 
+ */
+struct phys_cpuid {
+	short			nasid;
+	char			subnode;
+	char			slice;
+};
+
+struct nodepda_s {
+	void 		*pdinfo;	/* Platform-dependent per-node info */
+	spinlock_t		bist_lock;
+
+	/*
+	 * The BTEs on this node are shared by the local cpus
+	 */
+	struct bteinfo_s	bte_if[BTES_PER_NODE];	/* Virtual Interface */
+	struct timer_list	bte_recovery_timer;
+	spinlock_t		bte_recovery_lock;
+
+	/* 
+	 * Array of pointers to the nodepdas for each node.
+	 */
+	struct nodepda_s	*pernode_pdaindr[MAX_COMPACT_NODES]; 
+
+	/*
+	 * Array of physical cpu identifiers. Indexed by cpuid.
+	 */
+	struct phys_cpuid	phys_cpuid[NR_CPUS];
+};
+
+typedef struct nodepda_s nodepda_t;
+
+/*
+ * Access Functions for node PDA.
+ * Since there is one nodepda for each node, we need a convenient mechanism
+ * to access these nodepdas without cluttering code with #ifdefs.
+ * The next set of definitions provides this.
+ * Routines are expected to use 
+ *
+ *	nodepda			-> to access node PDA for the node on which code is running
+ *	subnodepda		-> to access subnode PDA for the subnode on which code is running
+ *
+ *	NODEPDA(cnode)		-> to access node PDA for cnodeid 
+ *	SUBNODEPDA(cnode,sn)	-> to access subnode PDA for cnodeid/subnode
+ */
+
+#define	nodepda		pda->p_nodepda		/* Ptr to this node's PDA */
+#define	NODEPDA(cnode)		(nodepda->pernode_pdaindr[cnode])
+
+/*
+ * Check if given a compact node id the corresponding node has all the
+ * cpus disabled. 
+ */
+#define is_headless_node(cnode)		(nr_cpus_node(cnode) == 0)
+
+#endif /* _ASM_IA64_SN_NODEPDA_H */