You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
1.2 KiB
34 lines
1.2 KiB
Activity Monitors
|
|
=================
|
|
|
|
FEAT_AMUv1 of the Armv8-A architecture introduces the Activity Monitors
|
|
extension. This extension describes the architecture for the Activity Monitor
|
|
Unit (|AMU|), an optional non-invasive component for monitoring core events
|
|
through a set of 64-bit counters.
|
|
|
|
When the ``ENABLE_FEAT_AMU=1`` build option is provided, Trusted Firmware-A
|
|
sets up the |AMU| prior to its exit from EL3, and will save and restore
|
|
architected |AMU| counters as necessary upon suspend and resume.
|
|
|
|
.. _Activity Monitor Auxiliary Counters:
|
|
|
|
Auxiliary counters
|
|
------------------
|
|
|
|
FEAT_AMUv1 describes a set of implementation-defined auxiliary counters (also
|
|
known as group 1 counters), controlled by the ``ENABLE_AMU_AUXILIARY_COUNTERS``
|
|
build option.
|
|
|
|
As a security precaution, Trusted Firmware-A does not enable these by default.
|
|
Instead, platforms may configure their auxiliary counters through one of two
|
|
possible mechanisms:
|
|
|
|
- |FCONF|, controlled by the ``ENABLE_AMU_FCONF`` build option.
|
|
- A platform implementation of the ``plat_amu_topology`` function (the default).
|
|
|
|
See :ref:`Activity Monitor Unit (AMU) Bindings` for documentation on the |FCONF|
|
|
device tree bindings.
|
|
|
|
--------------
|
|
|
|
*Copyright (c) 2021, Arm Limited. All rights reserved.*
|
|
|