feat(psci): add psci_do_manage_extensions API

Adding a new API under PSCI library,for managing all the architectural
features, required during power off or suspend cases.

Change-Id: I1659560daa43b9344dd0cc0d9b311129b4e9a9c7
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>

include/lib/psci/psci_lib.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2022, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -94,6 +94,7 @@ int psci_stop_other_cores(unsigned int wait_ms,
 bool psci_is_last_on_cpu_safe(void);
 bool psci_are_all_cpus_on_safe(void);
 void psci_pwrdown_cpu(unsigned int power_level);
+void psci_do_manage_extensions(void);
 
 #endif /* __ASSEMBLER__ */
 

lib/psci/psci_common.c

@@ -1164,6 +1164,8 @@ int psci_secondaries_brought_up(void)
  ******************************************************************************/
 void psci_pwrdown_cpu(unsigned int power_level)
 {
+	psci_do_manage_extensions();
+
 #if HW_ASSISTED_COHERENCY
 	/*
 	 * With hardware-assisted coherency, the CPU drivers only initiate the
@@ -1283,3 +1285,13 @@ bool psci_are_all_cpus_on_safe(void)
 
 	return true;
 }
+
+/*******************************************************************************
+ * This function performs architectural feature specific management.
+ * It ensures the architectural features are disabled during cpu
+ * power off/suspend operations.
+ ******************************************************************************/
+void psci_do_manage_extensions(void)
+{
+
+}