commit 8186596b15f80a647f49555d1f1a934a41be13ea
author johpow01 <john.powell@arm.com> Fri Jan 28 17:06:20 2022 -0600
committer John Powell <john.powell@arm.com> Thu May 05 19:43:10 2022 +0200
tree 843a7156144107e776b282ba0db093b44c7ac64a
parent f8d67af4553393893b0b78fd3a4808191cc36572

feat(brbe): add BRBE support for NS world

This patch enables access to the branch record buffer control registers
in non-secure EL2 and EL1 using the new build option ENABLE_BRBE_FOR_NS.
It is disabled for all secure world, and cannot be used with ENABLE_RME.

This option is disabled by default, however, the FVP platform makefile
enables it for FVP builds.

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I576a49d446a8a73286ea6417c16bd0b8de71fca0

Makefile

diff --git a/Makefile b/Makefile
index a6cb013..90fb28b 100644
--- a/Makefile
+++ b/Makefile
@@ -135,6 +135,10 @@
 ifneq (${ENABLE_PIE},0)
         $(error ENABLE_RME does not support PIE)
 endif
+# RME doesn't support BRBE
+ifneq (${ENABLE_BRBE_FOR_NS},0)
+        $(error ENABLE_RME does not support BRBE.)
+endif
 # RME requires AARCH64
 ifneq (${ARCH},aarch64)
         $(error ENABLE_RME requires AArch64)
@@ -777,8 +781,10 @@
     endif
 endif
 
-# SME/SVE only supported on AArch64
+# Ensure that no Aarch64-only features are enabled in Aarch32 build
 ifeq (${ARCH},aarch32)
+
+    # SME/SVE only supported on AArch64
     ifeq (${ENABLE_SME_FOR_NS},1)
         $(error "ENABLE_SME_FOR_NS cannot be used with ARCH=aarch32")
     endif
@@ -786,6 +792,12 @@
         # Warning instead of error due to CI dependency on this
         $(error "ENABLE_SVE_FOR_NS cannot be used with ARCH=aarch32")
     endif
+
+    # BRBE is not supported in Aarch32
+    ifeq (${ENABLE_BRBE_FOR_NS},1)
+        $(error "ENABLE_BRBE_FOR_NS cannot be used with ARCH=aarch32")
+    endif
+
 endif
 
 # Ensure ENABLE_RME is not used with SME
@@ -1032,6 +1044,7 @@
         COT_DESC_IN_DTB \
         USE_SP804_TIMER \
         PSA_FWU_SUPPORT \
+        ENABLE_BRBE_FOR_NS \
         ENABLE_TRBE_FOR_NS \
         ENABLE_SYS_REG_TRACE_FOR_NS \
         ENABLE_MPMM \
@@ -1172,6 +1185,7 @@
         NR_OF_FW_BANKS \
         NR_OF_IMAGES_IN_FW_BANK \
         PSA_FWU_SUPPORT \
+        ENABLE_BRBE_FOR_NS \
         ENABLE_TRBE_FOR_NS \
         ENABLE_SYS_REG_TRACE_FOR_NS \
         ENABLE_TRF_FOR_NS \