commit e558f9c4fb31abeecca4933051536c2b48e5b11b
author Arvind Ram Prakash <arvind.ramprakash@arm.com> Mon Nov 11 14:32:37 2024 -0600
committer Arvind Ram Prakash <arvind.ramprakash@arm.com> Thu Dec 12 10:03:23 2024 -0600
tree 0a0ac4099cd2d41694160d5a20b82ff31658ac5c
parent c75c40329aa60889ff187844b549c527a957ed27

feat(fpmr): disable FPMR trap

This patch enables support of FEAT_FPMR by enabling access
to FPMR register. It achieves it by setting the EnFPM bit of
SCR_EL3. This feature is currently enabled for NS world only.

Reference:
https://developer.arm.com/documentation/109697/2024_09/
Feature-descriptions/The-Armv9-5-architecture-extension?lang=en

Change-Id: I580c409b9b22f8ead0737502280fb9093a3d5dd2
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 59188da..8bdc13c 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -142,6 +142,8 @@
  * +----------------------------+
  * |	FEAT_LS64_ACCDATA	|
  * +----------------------------+
+ * |	FEAT_FPMR		|
+ * +----------------------------+
  */
 
 __attribute__((always_inline))
@@ -284,6 +286,12 @@
 		     ID_AA64MMFR3_EL1_D128_MASK, D128_IMPLEMENTED,
 		     ENABLE_FEAT_D128)
 
+/* FEAT_FPMR */
+CREATE_FEATURE_FUNCS(feat_fpmr, id_aa64pfr2_el1, ID_AA64PFR2_EL1_FPMR_SHIFT,
+		     ID_AA64PFR2_EL1_FPMR_MASK, FPMR_IMPLEMENTED,
+		     ENABLE_FEAT_FPMR)
+
+
 __attribute__((always_inline))
 static inline bool is_feat_sxpie_supported(void)
 {