blob: 6975b049ccac5da4289ef75041469f40b13400bd [file] [log] [blame]
/*
* Copyright (c) 2022, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <arch_helpers.h>
static bool brbe_supported(void)
{
uint64_t features;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_BRBE_SHIFT;
return ((features & ID_AA64DFR0_BRBE_MASK) ==
ID_AA64DFR0_BRBE_SUPPORTED);
}
void brbe_enable(void)
{
uint64_t val;
if (brbe_supported()) {
/*
* MDCR_EL3.SBRBE = 0b01
*
* Allows BRBE usage in non-secure world and prohibited in
* secure world.
*/
val = read_mdcr_el3();
val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT);
val |= (0x1UL << MDCR_SBRBE_SHIFT);
write_mdcr_el3(val);
}
}