| /* |
| * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <amu.h> |
| #include <arch.h> |
| #include <arch_helpers.h> |
| |
| void amu_enable(int el2_unused) |
| { |
| uint64_t features; |
| |
| features = read_id_pfr0() >> ID_PFR0_AMU_SHIFT; |
| if ((features & ID_PFR0_AMU_MASK) == 1) { |
| if (el2_unused) { |
| uint64_t v; |
| |
| /* |
| * Non-secure access from EL0 or EL1 to the Activity Monitor |
| * registers do not trap to EL2. |
| */ |
| v = read_hcptr(); |
| v &= ~TAM_BIT; |
| write_hcptr(v); |
| } |
| |
| /* Enable group 0 counters */ |
| write_amcntenset0(AMU_GROUP0_COUNTERS_MASK); |
| } |
| } |
