+ struct uv_systab *tab = &uv_systab;
+
+ if (!tab->function)
+ /*
+ * BIOS does not support UV systab
+ */
+ return BIOS_STATUS_UNIMPLEMENTED;
+
+ return efi_call6((void *)__va(tab->function),
+ (u64)which, a1, a2, a3, a4, a5);
+}
+
+s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
+ u64 a4, u64 a5)
+{
+ unsigned long bios_flags;
+ s64 ret;
+
+ local_irq_save(bios_flags);
+ ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+ local_irq_restore(bios_flags);
+
+ return ret;
+}
+
+s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
+ u64 a4, u64 a5)
+{
+ s64 ret;
+
+ preempt_disable();
+ ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+ preempt_enable();
+
+ return ret;
+}
+
+
+long sn_partition_id;
+EXPORT_SYMBOL_GPL(sn_partition_id);
+long sn_coherency_id;
+EXPORT_SYMBOL_GPL(sn_coherency_id);
+long sn_region_size;
+EXPORT_SYMBOL_GPL(sn_region_size);
+int uv_type;
+
+
+s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
+ long *region)
+{
+ s64 ret;
+ u64 v0, v1;
+ union partition_info_u part;
+
+ ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
+ (u64)(&v0), (u64)(&v1), 0, 0);
+ if (ret != BIOS_STATUS_SUCCESS)
+ return ret;
+
+ part.val = v0;
+ if (uvtype)
+ *uvtype = part.hub_version;
+ if (partid)
+ *partid = part.partition_id;
+ if (coher)
+ *coher = part.coherence_id;
+ if (region)
+ *region = part.region_size;
+ return ret;