blob: d57bb470bf9f6268cba25c398eb22bd6be30cd92 [file] [log] [blame]
/*
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <arch_helpers.h>
#include <mpam.h>
#include <stdbool.h>
bool mpam_supported(void)
{
uint64_t features = read_id_aa64dfr0_el1() >> ID_AA64PFR0_MPAM_SHIFT;
return ((features & ID_AA64PFR0_MPAM_MASK) != 0U);
}
void mpam_enable(bool el2_unused)
{
if (!mpam_supported())
return;
/*
* Enable MPAM, and disable trapping to EL3 when lower ELs access their
* own MPAM registers.
*/
write_mpam3_el3(MPAM3_EL3_MPAMEN_BIT);
/*
* If EL2 is implemented but unused, disable trapping to EL2 when lower
* ELs access their own MPAM registers.
*/
if (el2_unused) {
write_mpam2_el2(0);
if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U)
write_mpamhcr_el2(0);
}
}