commit 46880dc2fd74c8225fd728b031e19d2d6b0d2822
author Andre Przywara <andre.przywara@arm.com> Thu Nov 17 16:42:09 2022 +0000
committer Andre Przywara <andre.przywara@arm.com> Wed Mar 22 13:33:22 2023 +0000
tree 4a0518de3915a93f87acb2a373a1f399a8b7f5c1
parent c735f1c04a2542840c9a090e2d0efff8a332a2ef

refactor(cpufeat): align FEAT_SB to new feature handling

FEAT_SB introduces a new speculation barrier instruction, that is more
lightweight than a "dsb; isb" combination. We use that in a hot path,
so cannot afford and don't want a runtime detection mechanism.
Nevertheless align the implementation of the feature detection part
with the other features, but renaming the detection function, and
updating the FEAT_DETECTION code. Also update the documentation.

Change-Id: I2b86dfd1ad259c3bb99ab5186e2911ace454b54c
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Makefile

diff --git a/Makefile b/Makefile
index 8e789de..90d8bbf 100644
--- a/Makefile
+++ b/Makefile
@@ -1090,6 +1090,7 @@
         ENABLE_AMU_FCONF \
         AMU_RESTRICT_COUNTERS \
         ENABLE_ASSERTIONS \
+        ENABLE_FEAT_SB \
         ENABLE_PIE \
         ENABLE_PMF \
         ENABLE_PSCI_STAT \
@@ -1174,7 +1175,6 @@
         ENABLE_FEAT_PAN \
         ENABLE_FEAT_RNG \
         ENABLE_FEAT_RNG_TRAP \
-        ENABLE_FEAT_SB \
         ENABLE_FEAT_SEL2 \
         ENABLE_FEAT_TCR2 \
         ENABLE_FEAT_VHE \