feat(cpufeat): enable FEAT_BTI to FEAT_STATE_CHECKED
Introduce the is_feat_bti_{supported, present}() helpers and replace
checks for ENABLE_BTI with it. Also factor out the setting of
SCTLR_EL3.BT out of the PAuth enablement and place it in the respective
entrypoints where we initialise SCTLR_EL3. This makes PAuth
self-contained and SCTLR_EL3 initialisation centralised.
Change-Id: I0c0657ff1e78a9652cd2cf1603478283dc01f17b
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index 43ff2cc..0dd44b4 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -199,8 +199,8 @@
ID_AA64MMFR2_EL1_ST_MASK, 1U)
/* FEAT_BTI: Branch target identification */
-CREATE_FEATURE_PRESENT(feat_bti, id_aa64pfr1_el1, ID_AA64PFR1_EL1_BT_SHIFT,
- ID_AA64PFR1_EL1_BT_MASK, BTI_IMPLEMENTED)
+CREATE_FEATURE_FUNCS(feat_bti, id_aa64pfr1_el1, ID_AA64PFR1_EL1_BT_SHIFT,
+ ID_AA64PFR1_EL1_BT_MASK, BTI_IMPLEMENTED, ENABLE_BTI)
/* FEAT_MTE2: Memory tagging extension */
CREATE_FEATURE_FUNCS(feat_mte2, id_aa64pfr1_el1, ID_AA64PFR1_EL1_MTE_SHIFT,