feat(mte): add mte2 feat
Add support for feat mte2. tfsr_el2 is available only with mte2,
however currently its context_save/restore is done with mte rather than
mte2, so introduce 'is_feat_mte2_supported' to check mte2.
Change-Id: I108d9989a8f5b4d1d2f3b9865a914056fa566cf2
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/docs/design/firmware-design.rst b/docs/design/firmware-design.rst
index bddff16..ba97264 100644
--- a/docs/design/firmware-design.rst
+++ b/docs/design/firmware-design.rst
@@ -2767,13 +2767,9 @@
- Branch Target Identification feature is selected by ``BRANCH_PROTECTION``
option set to 1. This option defaults to 0.
-- Memory Tagging Extension feature is unconditionally enabled for both worlds
- (at EL0 and S-EL0) if it is only supported at EL0. If instead it is
- implemented at all ELs, it is unconditionally enabled for only the normal
- world. To enable it for the secure world as well, the build option
- ``ENABLE_FEAT_MTE`` is required. If the hardware does not implement
- MTE support at all, it is always disabled, no matter what build options
- are used.
+- Memory Tagging Extension feature is unconditionally enabled for both worlds.
+ To enable MTE at EL0 use ``ENABLE_FEAT_MTE`` is required and to enable MTE at
+ ELX ``ENABLE_FEAT_MTE2`` is required.
Armv7-A
~~~~~~~
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index cc20261..16522bd 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -341,9 +341,14 @@
mechanism. Default value is ``0``.
- ``ENABLE_FEAT_MTE``: Numeric value to enable Memory Tagging Extension
- if the platform wants to use this feature in the Secure world and MTE is
- enabled at ELX. This flag can take values 0 to 2, to align with the
- ``ENABLE_FEAT`` mechanism. Default value is ``0``.
+ if the platform wants to use this feature at EL0 ``ENABLE_FEAT_MTE`` is
+ required. This flag can take values 0 to 2, to align with the ``ENABLE_FEAT``
+ feature detection mechanism. Default value is ``0``.
+
+- ``ENABLE_FEAT_MTE2``: Numeric value to enable Memory Tagging Extension2
+ if the platform wants to use this feature and MTE2 is enabled at ELX.
+ This flag can take values 0 to 2, to align with the ``ENABLE_FEAT``
+ mechanism. Default value is ``0``.
- ``ENABLE_FEAT_MTE_PERM``: Numeric value to enable support for
``FEAT_MTE_PERM``, which introduces Allocation tag access permission to