feat(sve): enable SVE for the secure world
Enables SVE support for the secure world via ENABLE_SVE_FOR_SWD.
ENABLE_SVE_FOR_SWD defaults to 0 and has to be explicitly set by the
platform. SVE is configured during initial setup and then uses EL3
context save/restore routine to switch between SVE configurations for
different contexts.
Reset value of CPTR_EL3 changed to be most restrictive by default.
Signed-off-by: Max Shvetsov <maksims.svecovs@arm.com>
Change-Id: I889fbbc2e435435d66779b73a2d90d1188bf4116
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 99fc21d..5844304 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -278,7 +278,8 @@
- ``ENABLE_SVE_FOR_NS``: Boolean option to enable Scalable Vector Extension
(SVE) for the Non-secure world only. SVE is an optional architectural feature
for AArch64. Note that when SVE is enabled for the Non-secure world, access
- to SIMD and floating-point functionality from the Secure world is disabled.
+ to SIMD and floating-point functionality from the Secure world is disabled by
+ default and controlled with ENABLE_SVE_FOR_SWD.
This is to avoid corruption of the Non-secure world data in the Z-registers
which are aliased by the SIMD and FP registers. The build option is not
compatible with the ``CTX_INCLUDE_FPREGS`` build option, and will raise an
@@ -286,6 +287,11 @@
1. The default is 1 but is automatically disabled when the target
architecture is AArch32.
+- ``ENABLE_SVE_FOR_SWD``: Boolean option to enable SVE for the Secure world.
+ SVE is an optional architectural feature for AArch64. Note that this option
+ requires ENABLE_SVE_FOR_NS to be enabled. The default is 0 and it is
+ automatically disabled when the target architecture is AArch32.
+
- ``ENABLE_STACK_PROTECTOR``: String option to enable the stack protection
checks in GCC. Allowed values are "all", "strong", "default" and "none". The
default value is set to "none". "strong" is the recommended stack protection