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https://github.com/ARM-software/arm-trusted-firmware.git
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40daecc1be
No functional changes. Change-Id: I2f28f20944f552447ac4e9e755493cd7c0ea1192 Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
41 lines
834 B
C
41 lines
834 B
C
/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <arch_helpers.h>
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#include <mpam.h>
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#include <stdbool.h>
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bool mpam_supported(void)
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{
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uint64_t features = read_id_aa64dfr0_el1() >> ID_AA64PFR0_MPAM_SHIFT;
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return ((features & ID_AA64PFR0_MPAM_MASK) != 0U);
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}
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void mpam_enable(bool el2_unused)
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{
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if (!mpam_supported())
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return;
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/*
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* Enable MPAM, and disable trapping to EL3 when lower ELs access their
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* own MPAM registers.
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*/
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write_mpam3_el3(MPAM3_EL3_MPAMEN_BIT);
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/*
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* If EL2 is implemented but unused, disable trapping to EL2 when lower
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* ELs access their own MPAM registers.
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*/
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if (el2_unused) {
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write_mpam2_el2(0);
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if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U)
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write_mpamhcr_el2(0);
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}
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}
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