SPE: Fix feature detection
Currently the feature test for the SPE extension requires the feature
bits in the ID_AA64DFR0 register to read exactly 0b0001.
However the architecture guarantees that any values greater than 0
indicate the presence of a feature, which is what we are after in
our spe_supported() function.
Change the comparison to include all values greater than 0.
This fixes SPE support in non-secure world on implementations which
include the Scalable Vector Extension (SVE), for instance on Zeus cores.
Change-Id: If6cbd1b72d6abb8a303e2c0a7839d508f071cdbe
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/lib/extensions/spe/spe.c b/lib/extensions/spe/spe.c
index 78876c6..f0d7342 100644
--- a/lib/extensions/spe/spe.c
+++ b/lib/extensions/spe/spe.c
@@ -25,7 +25,7 @@
uint64_t features;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT;
- return (features & ID_AA64DFR0_PMS_MASK) == 1U;
+ return (features & ID_AA64DFR0_PMS_MASK) > 0ULL;
}
void spe_enable(bool el2_unused)