feat(rng-trap): add EL3 support for FEAT_RNG_TRAP
FEAT_RNG_TRAP introduces support for EL3 trapping of reads of the
RNDR and RNDRRS registers, which is enabled by setting the
SCR_EL3.TRNDR bit. This patch adds a new build flag
ENABLE_FEAT_RNG_TRAP that enables the feature.
This feature is supported only in AArch64 state from Armv8.5 onwards.
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: Ia9f17aef3444d3822bf03809036a1f668c9f2d89
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index fab6bf6..42ebd33 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -160,6 +160,10 @@
# Flag to enable access to the Random Number Generator registers
ENABLE_FEAT_RNG := 0
+# Flag to enable support for EL3 trapping of reads of the RNDR and RNDRRS
+# registers, by setting SCR_EL3.TRNDR.
+ENABLE_FEAT_RNG_TRAP := 0
+
# Flag to enable Speculation Barrier Instruction
ENABLE_FEAT_SB := 0