tree 9cd0cea7cc03edb08896b13428825186b2c9ff4d
parent 96c7df0ab83102a36f2db641ebcd65a7d19984e5
author Jeenu Viswambharan <jeenu.viswambharan@arm.com> 1522854431 +0100
committer Jeenu Viswambharan <jeenu.viswambharan@arm.com> 1525419197 +0100

AArch64: Introduce RAS handling

RAS extensions are mandatory for ARMv8.2 CPUs, but are also optional
extensions to base ARMv8.0 architecture.

This patch adds build system support to enable RAS features in ARM
Trusted Firmware. A boolean build option RAS_EXTENSION is introduced for
this.

With RAS_EXTENSION, an Exception Synchronization Barrier (ESB) is
inserted at all EL3 vector entry and exit. ESBs will synchronize pending
external aborts before entering EL3, and therefore will contain and
attribute errors to lower EL execution. Any errors thus synchronized are
detected via. DISR_EL1 register.

When RAS_EXTENSION is set to 1, HANDLE_EL3_EA_FIRST must also be set to 1.

Change-Id: I38a19d84014d4d8af688bd81d61ba582c039383a
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>