Enable v8.6 AMU enhancements (FEAT_AMUv1p1)
ARMv8.6 adds virtual offset registers to support virtualization of the
event counters in EL1 and EL0. This patch enables support for this
feature in EL3 firmware.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I7ee1f3d9f554930bf5ef6f3d492e932e6d95b217
diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index 671b3dc..47a797a 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2019-2020, Arm Limited. All rights reserved.
+ * Copyright (c) 2019-2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -82,6 +82,12 @@
ID_AA64ISAR0_RNDR_MASK);
}
+static inline bool is_armv8_6_feat_amuv1p1_present(void)
+{
+ return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_AMU_SHIFT) &
+ ID_AA64PFR0_AMU_MASK) >= ID_AA64PFR0_AMU_V1P1);
+}
+
/*
* Return MPAM version:
*