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
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 585b2a1..d2cda4d 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -973,6 +973,11 @@
functions that wait for an arbitrary time length (udelay and mdelay). The
default value is 0.
+- ``ENABLE_BRBE_FOR_NS``: This flag enables access to the branch record buffer
+ registers from NS ELs when FEAT_BRBE is implemented. BRBE is an optional
+ architectural feature for AArch64. The default is 0 and it is automatically
+ disabled when the target architecture is AArch32.
+
- ``ENABLE_TRBE_FOR_NS``: This flag is used to enable access of trace buffer
control registers from NS ELs, NS-EL2 or NS-EL1(when NS-EL2 is implemented
but unused) when FEAT_TRBE is implemented. TRBE is an optional architectural