AMU: Implement support for aarch64
The `ENABLE_AMU` build option can be used to enable the
architecturally defined AMU counters. At present, there is no support
for the auxiliary counter group.
Change-Id: I7ea0c0a00327f463199d1b0a481f01dadb09d312
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 1b90f29..79d660d 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -322,8 +322,9 @@
details.
- ``ENABLE_AMU``: Boolean option to enable Activity Monitor Unit extensions.
- Currently this option only applies for platforms that include a v8.2 processor
- with AMU implemented. Default is 0.
+ This is an optional architectural feature available on v8.4 onwards. Some
+ v8.2 implementations also implement an AMU and this option can be used to
+ enable this feature on those systems as well. Default is 0.
- ``ENABLE_ASSERTIONS``: This option controls whether or not calls to ``assert()``
are compiled out. For debug builds, this option defaults to 1, and calls to