+/*
+ * Return the firmware-specified size of the error log buffer
+ * for all rtas calls that require an error buffer argument.
+ * This includes 'check-exception' and 'rtas-last-error'.
+ */
+int rtas_get_error_log_max(void)
+{
+ static int rtas_error_log_max;
+ if (rtas_error_log_max)
+ return rtas_error_log_max;
+
+ rtas_error_log_max = rtas_token ("rtas-error-log-max");
+ if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
+ (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
+ printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max);
+ rtas_error_log_max = RTAS_ERROR_LOG_MAX;
+ }
+ return rtas_error_log_max;
+}
+
+/*
+ * Call early during boot, before mem init or bootmem, to retreive the RTAS
+ * informations from the device-tree and allocate the RMO buffer for userland
+ * accesses.
+ */
+void __init rtas_initialize(void)
+{
+ /* Get RTAS dev node and fill up our "rtas" structure with infos
+ * about it.
+ */
+ rtas.dev = of_find_node_by_name(NULL, "rtas");
+ if (rtas.dev) {
+ u64 *basep, *entryp;
+ u32 *sizep;
+
+ basep = (u64 *)get_property(of_chosen, "linux,rtas-base", NULL);
+ sizep = (u32 *)get_property(of_chosen, "linux,rtas-size", NULL);
+ if (basep != NULL && sizep != NULL) {
+ rtas.base = *basep;
+ rtas.size = *sizep;
+ entryp = (u64 *)get_property(of_chosen, "linux,rtas-entry", NULL);
+ if (entryp == NULL) /* Ugh */
+ rtas.entry = rtas.base;
+ else
+ rtas.entry = *entryp;
+ } else
+ rtas.dev = NULL;
+ }
+ /* If RTAS was found, allocate the RMO buffer for it and look for
+ * the stop-self token if any
+ */
+ if (rtas.dev) {
+ unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
+ if (systemcfg->platform == PLATFORM_PSERIES_LPAR)
+ rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
+
+ rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE,
+ rtas_region);
+
+#ifdef CONFIG_HOTPLUG_CPU
+ rtas_stop_self_args.token = rtas_token("stop-self");
+#endif /* CONFIG_HOTPLUG_CPU */
+ }
+
+}
+
+