refactor(cpufeat): enable SYS_REG_TRACE for FEAT_STATE_CHECKED
At the moment we only support access to the trace unit by system
registers (SYS_REG_TRACE) to be either unconditionally compiled in, or
to be not supported at all.
Add support for runtime detection (ENABLE_SYS_REG_TRACE_FOR_NS=2), by
adding is_feat_sys_reg_trace_supported(). That function considers both
build time settings and runtime information (if needed), and is used
before we access SYS_REG_TRACE related registers.
The FVP platform decided to compile in support unconditionally (=1),
even though this is an optional feature, so it 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: I450a574a4f6bd9fc269887037049c94c906f54b2
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index 91406cf..006843e 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -120,7 +120,7 @@
BL31_SOURCES += lib/extensions/brbe/brbe.c
endif
-ifeq (${ENABLE_SYS_REG_TRACE_FOR_NS},1)
+ifneq (${ENABLE_SYS_REG_TRACE_FOR_NS},0)
BL31_SOURCES += lib/extensions/sys_reg_trace/aarch64/sys_reg_trace.c
endif