Chris Kay | cda8921 | 2021-08-17 16:24:57 +0100 | [diff] [blame^] | 1 | Activity Monitors |
| 2 | ================= |
| 3 | |
| 4 | FEAT_AMUv1 of the Armv8-A architecture introduces the Activity Monitors |
| 5 | extension. This extension describes the architecture for the Activity Monitor |
| 6 | Unit (|AMU|), an optional non-invasive component for monitoring core events |
| 7 | through a set of 64-bit counters. |
| 8 | |
| 9 | When the ``ENABLE_AMU=1`` build option is provided, Trusted Firmware-A sets up |
| 10 | the |AMU| prior to its exit from EL3, and will save and restore architected |
| 11 | |AMU| counters as necessary upon suspend and resume. |
| 12 | |
| 13 | -------------- |
| 14 | |
| 15 | *Copyright (c) 2021, Arm Limited. All rights reserved.* |