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
diff --git a/include/lib/extensions/pmuv3.h b/include/lib/extensions/pmuv3.h
new file mode 100644
index 0000000..5d5d055
--- /dev/null
+++ b/include/lib/extensions/pmuv3.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PMUV3_H
+#define PMUV3_H
+
+#include <context.h>
+
+void pmuv3_disable_el3(void);
+
+#ifdef __aarch64__
+void pmuv3_enable(cpu_context_t *ctx);
+void pmuv3_init_el2_unused(void);
+#endif /* __aarch64__ */
+
+#endif /* PMUV3_H */