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fd5da7a847
The patch removes initialization of MPAM EL2 registers when an EL2 software exists. The patch assumes the EL2 software will perform the necessary initializations of the registers. Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com> Change-Id: I5bed81bc22f417bc3e3cbbcd860a8553cd4307cd
39 lines
787 B
C
39 lines
787 B
C
/*
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* Copyright (c) 2018-2022, 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 <stdbool.h>
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#include <arch.h>
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#include <arch_features.h>
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#include <arch_helpers.h>
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#include <lib/extensions/mpam.h>
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void mpam_enable(bool el2_unused)
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{
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/* Check if MPAM is implemented */
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if (get_mpam_version() == 0U) {
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return;
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}
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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(0ULL);
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if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U) {
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write_mpamhcr_el2(0ULL);
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}
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}
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}
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