Enable MTE support in both secure and non-secure worlds
This patch adds support for the new Memory Tagging Extension arriving in
ARMv8.5. MTE support is now enabled by default on systems that support
at EL0. To enable it at ELx for both the non-secure and the secure
world, the compiler flag CTX_INCLUDE_MTE_REGS includes register saving
and restoring when necessary in order to prevent register leakage
between the worlds.
Change-Id: I2d4ea993d6b11654ea0d4757d00ca20d23acf36c
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index f63e46f..66c2af4 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -214,6 +214,11 @@
override ENABLE_SPE_FOR_LOWER_ELS := 0
endif
+# Include Memory Tagging Extension registers in cpu context. This must be set
+# to 1 if the platform wants to use this feature in the Secure world and MTE is
+# enabled at ELX.
+CTX_INCLUDE_MTE_REGS := 0
+
ENABLE_AMU := 0
# By default, enable Scalable Vector Extension if implemented for Non-secure