commit 6b8df7b9e5cc70ef0433a99bf73db6db6002482c
author Arvind Ram Prakash <arvind.ramprakash@arm.com> Thu Jan 09 17:18:30 2025 -0600
committer Arvind Ram Prakash <arvind.ramprakash@arm.com> Tue Jan 14 15:30:19 2025 -0600
tree 59677f3319b5c2355ca7a83887791f2b2587699a
parent 624ffe51eabc1d00bb46c8bfadb4b229d5b2f5a9

feat(mops): enable FEAT_MOPS in EL3 when INIT_UNUSED_NS_EL2=1

FEAT_MOPS, mandatory from Arm v8.8, is typically managed in EL2.
However, in configurations where NS_EL2 is not enabled,
EL3 must set the HCRX_EL2.MSCEn bit to 1 to enable the feature.

This patch ensures FEAT_MOPS is enabled by setting HCRX_EL2.MSCEn to 1.

Change-Id: Ic4960e0cc14a44279156b79ded50de475b3b21c5
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>

include/arch/aarch64/arch_features.h

diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index 99c2cdf..1d0a2e0 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -144,6 +144,8 @@
  * +----------------------------+
  * |	FEAT_FPMR		|
  * +----------------------------+
+ * |	FEAT_MOPS		|
+ * +----------------------------+
  */
 
 __attribute__((always_inline))
@@ -290,7 +292,10 @@
 CREATE_FEATURE_FUNCS(feat_fpmr, id_aa64pfr2_el1, ID_AA64PFR2_EL1_FPMR_SHIFT,
 		     ID_AA64PFR2_EL1_FPMR_MASK, FPMR_IMPLEMENTED,
 		     ENABLE_FEAT_FPMR)
-
+/* FEAT_MOPS */
+CREATE_FEATURE_FUNCS(feat_mops, id_aa64isar2_el1, ID_AA64ISAR2_EL1_MOPS_SHIFT,
+		     ID_AA64ISAR2_EL1_MOPS_MASK, MOPS_IMPLEMENTED,
+		     ENABLE_FEAT_MOPS)
 
 __attribute__((always_inline))
 static inline bool is_feat_sxpie_supported(void)