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/*
* Copyright (c) 2021-2023, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <arch_features.h>
#include <arch_helpers.h>
#include <lib/extensions/trf.h>
void trf_init_el3(void)
{
u_register_t val;
/*
* MDCR_EL3.STE = b0
* Trace prohibited in Secure state unless overridden by the
* IMPLEMENTATION DEFINED authentication interface.
*
* MDCR_EL3.TTRF = b0
* Allow access of trace filter control registers from NS-EL2
* and NS-EL1 when NS-EL2 is implemented but not used
*/
val = read_mdcr_el3();
val &= ~(MDCR_STE_BIT | MDCR_TTRF_BIT);
write_mdcr_el3(val);
}
void trf_init_el2_unused(void)
{
/*
* MDCR_EL2.TTRF: Set to zero so that access to Trace
* Filter Control register TRFCR_EL1 at EL1 is not
* trapped to EL2. This bit is RES0 in versions of
* the architecture earlier than ARMv8.4.
*
*/
write_mdcr_el2(read_mdcr_el2() & ~MDCR_EL2_TTRF);
}
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