mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-16 09:34:18 +00:00
9cf7564723
This change adds some documentation on the AMU and its purpose. This is expanded on in later patches. Change-Id: If2834676790938d8da5ea2ceba37b674f6cc0f01 Signed-off-by: Chris Kay <chris.kay@arm.com>
15 lines
579 B
ReStructuredText
15 lines
579 B
ReStructuredText
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.
|
|
|
|
--------------
|
|
|
|
*Copyright (c) 2021, Arm Limited. All rights reserved.*
|