feat(sctlr2): add support for FEAT_SCTLR2
Arm v8.9 introduces FEAT_SCTLR2, adding SCTLR2_ELx registers.
Support this, context switching the registers and disabling
traps so lower ELs can access the new registers.
Change the FVP platform to default to handling this as a dynamic option
so the right decision can be made by the code at runtime.
Change-Id: I0c4cba86917b6b065a7e8dd6af7daf64ee18dcda
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index c01d883..7776f5b 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -463,6 +463,14 @@
This flag can take the values 0 to 2, to align with the ``ENABLE_FEAT``
mechanism. Default value is ``0``.
+- ``ENABLE_FEAT_SCTLR2``: Numeric value to enable support for FEAT_SCTLR2
+ (Extension to SCTLR_ELx) at EL2 and below, setting the bit
+ SCR_EL3.SCTLR2En in EL3 to allow access to SCTLR2_ELx registers and
+ context switch them. This feature is OPTIONAL from Armv8.0 implementations
+ and mandatory in Armv8.9 implementations.
+ This flag can take the values 0 to 2, to align with the ``ENABLE_FEAT``
+ mechanism. Default value is ``0``.
+
- ``ENABLE_LTO``: Boolean option to enable Link Time Optimization (LTO)
support in GCC for TF-A. This option is currently only supported for
AArch64. Default is 0.