tree a64bf0813458d8889cd3c324488bcd5ff80069e3
parent b7e74439d88a2ff8b00bc6db45152622804936a7
author Boyan Karatotev <boyan.karatotev@arm.com> 1676467310 +0000
committer Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> 1688029146 +0100

feat(pmu): introduce pmuv3 lib/extensions folder

The enablement code for the PMU is scattered and difficult to track
down. Factor out the feature into its own lib/extensions folder and
consolidate the implementation. Treat it is as an architecturally
mandatory feature as it is currently.

Additionally, do some cleanup on AArch64. Setting overflow bits in
PMCR_EL0 is irrelevant for firmware so don't do it. Then delay the PMU
initialisation until the context management stage which simplifies the
early environment assembly. One side effect is that the PMU might count
before this happens so reset all counters to 0 to prevent any leakage.

Finally, add an enable to manage_extensions_realm() as realm world uses
the pmu. This introduces the HPMN fixup to realm world.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Ie13a8625820ecc5fbfa467dc6ca18025bf6a9cd3