diff --git a/include/asm-ia64/sn/sn_cpuid.h b/include/asm-ia64/sn/sn_cpuid.h
new file mode 100644
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+++ b/include/asm-ia64/sn/sn_cpuid.h
@@ -0,0 +1,144 @@
+/* 
+ *
+ * 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) 2000-2004 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+#ifndef _ASM_IA64_SN_SN_CPUID_H
+#define _ASM_IA64_SN_SN_CPUID_H
+
+#include <linux/config.h>
+#include <linux/smp.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/pda.h>
+#include <asm/intrinsics.h>
+
+
+/*
+ * Functions for converting between cpuids, nodeids and NASIDs.
+ * 
+ * These are for SGI platforms only.
+ *
+ */
+
+
+
+
+/*
+ *  Definitions of terms (these definitions are for IA64 ONLY. Other architectures
+ *  use cpuid/cpunum quite defferently):
+ *
+ *	   CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies
+ *		the cpu. The value cpuid has no significance on IA64 other than
+ *		the boot cpu is 0.
+ *			smp_processor_id() returns the cpuid of the current cpu.
+ *
+ * 	   CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID)
+ *		This is the same as 31:24 of the processor LID register
+ *			hard_smp_processor_id()- cpu_physical_id of current processor
+ *			cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid>
+ *			cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid> 
+ *				* not real efficient - don't use in perf critical code
+ *
+ *         SLICE - a number in the range of 0 - 3 (typically) that represents the
+ *		cpu number on a brick.
+ *
+ *	   SUBNODE - (almost obsolete) the number of the FSB that a cpu is
+ *		connected to. This is also the same as the PI number. Usually 0 or 1.
+ *
+ *	NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no 
+ *	significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM.
+ *
+ *
+ * The macros convert between cpu physical ids & slice/nasid/cnodeid.
+ * These terms are described below:
+ *
+ *
+ * Brick
+ *          -----   -----           -----   -----       CPU
+ *          | 0 |   | 1 |           | 0 |   | 1 |       SLICE
+ *          -----   -----           -----   -----
+ *            |       |               |       |
+ *            |       |               |       |
+ *          0 |       | 2           0 |       | 2       FSB SLOT
+ *             -------                 -------  
+ *                |                       |
+ *                |                       |
+ *                |                       |
+ *             ------------      -------------
+ *             |          |      |           |
+ *             |    SHUB  |      |   SHUB    |        NASID   (0..MAX_NASIDS)
+ *             |          |----- |           |        CNODEID (0..num_compact_nodes-1)
+ *             |          |      |           |
+ *             |          |      |           |
+ *             ------------      -------------
+ *                   |                 |
+ *                           
+ *
+ */
+
+#ifndef CONFIG_SMP
+#define cpu_physical_id(cpuid)			((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
+#endif
+
+
+#define get_node_number(addr)			NASID_GET(addr)
+
+/*
+ * NOTE: on non-MP systems, only cpuid 0 exists
+ */
+
+extern short physical_node_map[];			/* indexed by nasid to get cnode */
+
+/*
+ * Macros for retrieving info about current cpu
+ */
+#define get_nasid()			(nodepda->phys_cpuid[smp_processor_id()].nasid)
+#define get_subnode()			(nodepda->phys_cpuid[smp_processor_id()].subnode)
+#define get_slice()			(nodepda->phys_cpuid[smp_processor_id()].slice)
+#define get_cnode()			(nodepda->phys_cpuid[smp_processor_id()].cnode)
+#define get_sapicid()			((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
+
+/*
+ * Macros for retrieving info about an arbitrary cpu
+ *	cpuid - logical cpu id
+ */
+#define cpuid_to_nasid(cpuid)		(nodepda->phys_cpuid[cpuid].nasid)
+#define cpuid_to_subnode(cpuid)		(nodepda->phys_cpuid[cpuid].subnode)
+#define cpuid_to_slice(cpuid)		(nodepda->phys_cpuid[cpuid].slice)
+#define cpuid_to_cnodeid(cpuid)		(physical_node_map[cpuid_to_nasid(cpuid)])
+
+
+/*
+ * Dont use the following in performance critical code. They require scans
+ * of potentially large tables.
+ */
+extern int nasid_slice_to_cpuid(int, int);
+#define nasid_slice_to_cpu_physical_id(nasid, slice)			\
+	cpu_physical_id(nasid_slice_to_cpuid(nasid, slice))
+
+/*
+ * cnodeid_to_nasid - convert a cnodeid to a NASID
+ *	Macro relies on pg_data for a node being on the node itself.
+ *	Just extract the NASID from the pointer.
+ *
+ */
+#define cnodeid_to_nasid(cnodeid)	pda->cnodeid_to_nasid_table[cnodeid]
+ 
+/*
+ * nasid_to_cnodeid - convert a NASID to a cnodeid
+ */
+#define nasid_to_cnodeid(nasid)		(physical_node_map[nasid])
+
+/*
+ * partition_coherence_id - get the coherence ID of the current partition
+ */
+extern u8 sn_coherency_id;
+#define partition_coherence_id()	(sn_coherency_id)
+
+#endif /* _ASM_IA64_SN_SN_CPUID_H */
+