diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 24fe7c81e10890941e1c73e0856c371390521875..a4e218ce2edb89c045efc53ddb07b2eb2c472255 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -420,6 +420,26 @@ int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
 int __initdata nid_to_pxm_map[MAX_NUMNODES];
 static struct acpi_table_slit __initdata *slit_table;
 
+static int get_processor_proximity_domain(struct acpi_table_processor_affinity *pa)
+{
+	int pxm;
+
+	pxm = pa->proximity_domain;
+	if (ia64_platform_is("sn2"))
+		pxm += pa->reserved[0] << 8;
+	return pxm;
+}
+
+static int get_memory_proximity_domain(struct acpi_table_memory_affinity *ma)
+{
+	int pxm;
+
+	pxm = ma->proximity_domain;
+	if (ia64_platform_is("sn2"))
+		pxm += ma->reserved1[0] << 8;
+	return pxm;
+}
+
 /*
  * ACPI 2.0 SLIT (System Locality Information Table)
  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
@@ -443,16 +463,20 @@ void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 void __init
 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
 {
+	int pxm;
+
 	if (!pa->flags.enabled)
 		return;
 
+	pxm = get_processor_proximity_domain(pa);
+
 	/* record this node in proximity bitmap */
-	pxm_bit_set(pa->proximity_domain);
+	pxm_bit_set(pxm);
 
 	node_cpuid[srat_num_cpus].phys_id =
 	    (pa->apic_id << 8) | (pa->lsapic_eid);
 	/* nid should be overridden as logical node id later */
-	node_cpuid[srat_num_cpus].nid = pa->proximity_domain;
+	node_cpuid[srat_num_cpus].nid = pxm;
 	srat_num_cpus++;
 }
 
@@ -460,10 +484,10 @@ void __init
 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
 {
 	unsigned long paddr, size;
-	u8 pxm;
+	int pxm;
 	struct node_memblk_s *p, *q, *pend;
 
-	pxm = ma->proximity_domain;
+	pxm = get_memory_proximity_domain(ma);
 
 	/* fill node memory chunk structure */
 	paddr = ma->base_addr_hi;
diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index f7a517654308e03f4c0ee880dc5cb88fbfaad615..d734585a23cfc37444dd61a76c1386833a0700fe 100644
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -111,7 +111,11 @@ extern int additional_cpus;
 
 #ifdef CONFIG_ACPI_NUMA
 /* Proximity bitmap length; _PXM is at most 255 (8 bit)*/
+#ifdef CONFIG_IA64_NR_NODES
+#define MAX_PXM_DOMAINS CONFIG_IA64_NR_NODES
+#else
 #define MAX_PXM_DOMAINS (256)
+#endif
 extern int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
 extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
 #endif