[IA64] add sn_register_pmi_handler oemcall

Add wrapper function to make SN_SAL_REGISTER_PMI_HANDLER ia64_sal_oemcall.
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

include/asm-ia64/sn/sn_sal.h

@@ -32,6 +32,7 @@
 #define  SN_SAL_NO_FAULT_ZONE_VIRTUAL		   0x02000010
 #define  SN_SAL_NO_FAULT_ZONE_PHYSICAL		   0x02000011
 #define  SN_SAL_PRINT_ERROR			   0x02000012
+#define  SN_SAL_REGISTER_PMI_HANDLER		   0x02000014
 #define  SN_SAL_SET_ERROR_HANDLING_FEATURES	   0x0200001a	// reentrant
 #define  SN_SAL_GET_FIT_COMPT			   0x0200001b	// reentrant
 #define  SN_SAL_GET_SAPIC_INFO                     0x0200001d
@@ -679,6 +680,25 @@ sn_register_nofault_code(u64 start_addr, u64 end_addr, u64 return_addr,
 	return ret_stuff.status;
 }
 
+/*
+ * Register or unregister a function to handle a PMI received by a CPU.
+ * Before calling the registered handler, SAL sets r1 to the value that
+ * was passed in as the global_pointer.
+ *
+ * If the handler pointer is NULL, then the currently registered handler
+ * will be unregistered.
+ *
+ * Returns 0 on success, or a negative value if an error occurred.
+ */
+static inline int
+sn_register_pmi_handler(u64 handler, u64 global_pointer)
+{
+	struct ia64_sal_retval ret_stuff;
+	ia64_sal_oemcall(&ret_stuff, SN_SAL_REGISTER_PMI_HANDLER, handler,
+			 global_pointer, 0, 0, 0, 0, 0);
+	return ret_stuff.status;
+}
+
 /*
  * Change or query the coherence domain for this partition. Each cpu-based
  * nasid is represented by a bit in an array of 64-bit words: