+#ifdef CONFIG_NUMA
+acpi_status __init
+acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
+{
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *obj;
+ struct acpi_table_iosapic *iosapic;
+ unsigned int gsi_base;
+ int node;
+
+ /* Only care about objects w/ a method that returns the MADT */
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+ return AE_OK;
+
+ if (!buffer.length || !buffer.pointer)
+ return AE_OK;
+
+ obj = buffer.pointer;
+ if (obj->type != ACPI_TYPE_BUFFER ||
+ obj->buffer.length < sizeof(*iosapic)) {
+ acpi_os_free(buffer.pointer);
+ return AE_OK;
+ }
+
+ iosapic = (struct acpi_table_iosapic *)obj->buffer.pointer;
+
+ if (iosapic->header.type != ACPI_MADT_IOSAPIC) {
+ acpi_os_free(buffer.pointer);
+ return AE_OK;
+ }
+
+ gsi_base = iosapic->global_irq_base;
+
+ acpi_os_free(buffer.pointer);
+ buffer.length = ACPI_ALLOCATE_BUFFER;
+ buffer.pointer = NULL;
+
+ /*
+ * OK, it's an IOSAPIC MADT entry, look for a _PXM method to tell
+ * us which node to associate this with.
+ */
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PXM", NULL, &buffer)))
+ return AE_OK;
+
+ if (!buffer.length || !buffer.pointer)
+ return AE_OK;
+
+ obj = buffer.pointer;
+
+ if (obj->type != ACPI_TYPE_INTEGER ||
+ obj->integer.value >= MAX_PXM_DOMAINS) {
+ acpi_os_free(buffer.pointer);
+ return AE_OK;
+ }
+
+ node = pxm_to_nid_map[obj->integer.value];
+ acpi_os_free(buffer.pointer);
+
+ if (node >= MAX_NUMNODES || !node_online(node) ||
+ cpus_empty(node_to_cpumask(node)))
+ return AE_OK;
+
+ /* We know a gsi to node mapping! */
+ map_iosapic_to_node(gsi_base, node);
+ return AE_OK;
+}
+#endif /* CONFIG_NUMA */