diff --git a/include/asm-ia64/sn/sn_sal.h b/include/asm-ia64/sn/sn_sal.h
index 3f7564dc0aa9bf052b6fee3a20791d4ac7ebb811..2a8b0d92a5d62f139ec98cb0e125883c7e39e122 100644
--- a/include/asm-ia64/sn/sn_sal.h
+++ b/include/asm-ia64/sn/sn_sal.h
@@ -56,6 +56,7 @@
 #define  SN_SAL_BUS_CONFIG		   	   0x02000037
 #define  SN_SAL_SYS_SERIAL_GET			   0x02000038
 #define  SN_SAL_PARTITION_SERIAL_GET		   0x02000039
+#define  SN_SAL_SYSCTL_PARTITION_GET               0x0200003a
 #define  SN_SAL_SYSTEM_POWER_DOWN		   0x0200003b
 #define  SN_SAL_GET_MASTER_BASEIO_NASID		   0x0200003c
 #define  SN_SAL_COHERENCE                          0x0200003d
@@ -580,6 +581,21 @@ sn_partition_serial_number_val(void) {
 	return sn_partition_serial_number;
 }
 
+/*
+ * Returns the partition id of the nasid passed in as an argument,
+ * or INVALID_PARTID if the partition id cannot be retrieved.
+ */
+static inline partid_t
+ia64_sn_sysctl_partition_get(nasid_t nasid)
+{
+	struct ia64_sal_retval ret_stuff;
+	SAL_CALL(ret_stuff, SN_SAL_SYSCTL_PARTITION_GET, nasid,
+		0, 0, 0, 0, 0, 0);
+	if (ret_stuff.status != 0)
+	    return -1;
+	return ((partid_t)ret_stuff.v0);
+}
+
 /*
  * Returns the physical address of the partition's reserved page through
  * an iterative number of calls.
@@ -1018,6 +1034,24 @@ ia64_sn_get_sn_info(int fc, u8 *shubtype, u16 *nasid_bitmask, u8 *nasid_shift,
 	ret_stuff.v2 = 0;
 	SAL_CALL_NOLOCK(ret_stuff, SN_SAL_GET_SN_INFO, fc, 0, 0, 0, 0, 0, 0);
 
+/***** BEGIN HACK - temp til old proms no longer supported ********/
+	if (ret_stuff.status == SALRET_NOT_IMPLEMENTED) {
+		int nasid = get_sapicid() & 0xfff;;
+#define SH_SHUB_ID_NODES_PER_BIT_MASK 0x001f000000000000UL
+#define SH_SHUB_ID_NODES_PER_BIT_SHFT 48
+		if (shubtype) *shubtype = 0;
+		if (nasid_bitmask) *nasid_bitmask = 0x7ff;
+		if (nasid_shift) *nasid_shift = 38;
+		if (systemsize) *systemsize = 10;
+		if (sharing_domain_size) *sharing_domain_size = 8;
+		if (partid) *partid = ia64_sn_sysctl_partition_get(nasid);
+		if (coher) *coher = nasid >> 9;
+		if (reg) *reg = (HUB_L((u64 *) LOCAL_MMR_ADDR(SH1_SHUB_ID)) & SH_SHUB_ID_NODES_PER_BIT_MASK) >>
+			SH_SHUB_ID_NODES_PER_BIT_SHFT;
+		return 0;
+	}
+/***** END HACK *******/
+
 	if (ret_stuff.status < 0)
 		return ret_stuff.status;