refactor(trf): enable FEAT_TRF for FEAT_STATE_CHECKED
At the moment we only support FEAT_TRF to be either unconditionally
compiled in, or to be not supported at all.
Add support for runtime detection (ENABLE_TRF_FOR_NS=2), by splitting
is_feat_trf_present() into an ID register reading function and a second
function to report the support status. That function considers both
build time settings and runtime information (if needed), and is used
before we access TRF related registers.
Also move the context saving code from assembly to C, and use the new
is_feat_trf_supported() function to guard its execution.
The FVP platform decided to compile in support unconditionally (=1),
even though FEAT_TRF is an ARMv8.4 feature, so is not available with the
FVP model's default command line.
Change that to the now supported dynamic option (=2), so the right
decision can be made by the code at runtime.
Change-Id: Ia97b01adbe24970a4d837afd463dc5506b7295a3
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/lib/extensions/trf/aarch64/trf.c b/lib/extensions/trf/aarch64/trf.c
index 1da5dce..941692b 100644
--- a/lib/extensions/trf/aarch64/trf.c
+++ b/lib/extensions/trf/aarch64/trf.c
@@ -4,33 +4,21 @@
* SPDX-License-Identifier: BSD-3-Clause
*/
-#include <stdbool.h>
-
#include <arch.h>
+#include <arch_features.h>
#include <arch_helpers.h>
#include <lib/extensions/trf.h>
-static bool trf_supported(void)
-{
- uint64_t features;
-
- features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEFILT_SHIFT;
- return ((features & ID_AA64DFR0_TRACEFILT_MASK) ==
- ID_AA64DFR0_TRACEFILT_SUPPORTED);
-}
-
void trf_enable(void)
{
uint64_t val;
- if (trf_supported()) {
- /*
- * MDCR_EL3.TTRF = b0
- * Allow access of trace filter control registers from NS-EL2
- * and NS-EL1 when NS-EL2 is implemented but not used
- */
- val = read_mdcr_el3();
- val &= ~MDCR_TTRF_BIT;
- write_mdcr_el3(val);
- }
+ /*
+ * MDCR_EL3.TTRF = b0
+ * Allow access of trace filter control registers from NS-EL2
+ * and NS-EL1 when NS-EL2 is implemented but not used
+ */
+ val = read_mdcr_el3();
+ val &= ~MDCR_TTRF_BIT;
+ write_mdcr_el3(val);
}