feat(ras): use FEAT_IESB for error synchronization
For synchronization of errors at exception boundries TF-A uses "esb"
instruction with FEAT_RAS or "dsb" and "isb" otherwise. The problem
with esb instruction is, along with synching errors it might also
consume the error, which is not ideal in all scenarios. On the other
hand we can't use dsb always as its in the hot path.
To solve above mentioned problem the best way is to use FEAT_IESB
feature which provides controls to insert an implicit Error
synchronization event at exception entry and exception return.
Assumption in TF-A is, if RAS Extension is present then FEAT_IESB will
also be present and enabled.
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ie5861eec5da4028a116406bb4d1fea7dac232456
diff --git a/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S
index 4c1fa1a..fbf2bca 100644
--- a/bl31/aarch64/runtime_exceptions.S
+++ b/bl31/aarch64/runtime_exceptions.S
@@ -57,8 +57,7 @@
* EL (KFH) or handles it in EL3 (FFH) based on EA routing model.
*/
.macro sync_and_handle_pending_serror
- dsb sy
- isb
+ synchronize_errors
mrs x30, ISR_EL1
tbz x30, #ISR_A_SHIFT, 2f
#if HANDLE_EA_EL3_FIRST_NS