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>

Makefile

diff --git a/Makefile b/Makefile
index 384c1e4..2b6857b 100644
--- a/Makefile
+++ b/Makefile
@@ -951,8 +951,21 @@
 	ifeq (${ENABLE_FEAT_RNG_TRAP},1)
                 $(error "ENABLE_FEAT_RNG_TRAP cannot be used with ARCH=aarch32")
 	endif
+
+	ifneq (${ENABLE_FEAT_FPMR},0)
+                $(error "ENABLE_FEAT_FPMR cannot be used with ARCH=aarch32")
+	endif
 endif #(ARCH=aarch32)
 
+ifneq (${ENABLE_FEAT_FPMR},0)
+	ifeq (${ENABLE_FEAT_FGT},0)
+                $(error "ENABLE_FEAT_FPMR requires ENABLE_FEAT_FGT")
+	endif
+	ifeq (${ENABLE_FEAT_HCX},0)
+                $(error "ENABLE_FEAT_FPMR requires ENABLE_FEAT_HCX")
+	endif
+endif #(ENABLE_FEAT_FPMR)
+
 ifneq (${ENABLE_SME_FOR_NS},0)
 	ifeq (${ENABLE_SVE_FOR_NS},0)
                 $(error "ENABLE_SME_FOR_NS requires ENABLE_SVE_FOR_NS")
@@ -1264,6 +1277,7 @@
 	ENABLE_FEAT_ECV \
 	ENABLE_FEAT_FGT \
 	ENABLE_FEAT_FGT2 \
+	ENABLE_FEAT_FPMR \
 	ENABLE_FEAT_HCX \
 	ENABLE_FEAT_LS64_ACCDATA \
 	ENABLE_FEAT_MTE2 \
@@ -1425,6 +1439,7 @@
 	ENABLE_MPMM_FCONF \
 	ENABLE_FEAT_FGT \
 	ENABLE_FEAT_FGT2 \
+	ENABLE_FEAT_FPMR \
 	ENABLE_FEAT_ECV \
 	ENABLE_FEAT_AMUv1p1 \
 	ENABLE_FEAT_SEL2 \