feat(sme): enable SME2 functionality for NS world
FEAT_SME2 is an extension of FEAT_SME and an optional feature
from v9.2. Its an extension of SME, wherein it not only
processes matrix operations efficiently, but also provides
outer-product instructions to accelerate matrix operations.
It affords instructions for multi-vector operations.
Further, it adds an 512 bit architectural register ZT0.
This patch implements all the changes introduced with FEAT_SME2
to ensure that the instructions are allowed to access ZT0
register from Non-secure lower exception levels.
Additionally, it adds support to ensure FEAT_SME2 is aligned
with the existing FEATURE DETECTION mechanism, and documented.
Change-Id: Iee0f61943304a9cfc3db8f986047b1321d0a6463
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index d2f463f..2229591 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -442,6 +442,13 @@
build with these options will fail. This flag can take the values 0 to 2, to
align with the ``FEATURE_DETECTION`` mechanism. Default is 0.
+- ``ENABLE_SME2_FOR_NS``: Numeric value to enable Scalable Matrix Extension
+ version 2 (SME2) for the non-secure world only. SME2 is an optional
+ architectural feature for AArch64 and TF-A support is experimental.
+ This should be set along with ENABLE_SME_FOR_NS=1, if not, the default SME
+ accesses will still be trapped. This flag can take the values 0 to 2, to
+ align with the ``FEATURE_DETECTION`` mechanism. Default is 0.
+
- ``ENABLE_SME_FOR_SWD``: Boolean option to enable the Scalable Matrix
Extension for secure world use along with SVE and FPU/SIMD, ENABLE_SME_FOR_NS
must also be set to use this. If enabling this, the secure world MUST