Enable v8.6 AMU enhancements (FEAT_AMUv1p1)
ARMv8.6 adds virtual offset registers to support virtualization of the
event counters in EL1 and EL0. This patch enables support for this
feature in EL3 firmware.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I7ee1f3d9f554930bf5ef6f3d492e932e6d95b217
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index c520e0c..5935b4e 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -22,6 +22,10 @@
directory containing the SP source, relative to the ``bl32/``; the directory
is expected to contain a makefile called ``<aarch32_sp-value>.mk``.
+- ``AMU_RESTRICT_COUNTERS``: Register reads to the group 1 counters will return
+ zero at all but the highest implemented exception level. Reads from the
+ memory mapped view are unaffected by this control.
+
- ``ARCH`` : Choose the target build architecture for TF-A. It can take either
``aarch64`` or ``aarch32`` as values. By default, it is defined to
``aarch64``.