| 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_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. |
| |
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| *Copyright (c) 2021, Arm Limited. All rights reserved.* |