1*91f16700Schasinglulu /* 2*91f16700Schasinglulu * Copyright (c) 2021-2023, Arm Limited. All rights reserved. 3*91f16700Schasinglulu * 4*91f16700Schasinglulu * SPDX-License-Identifier: BSD-3-Clause 5*91f16700Schasinglulu */ 6*91f16700Schasinglulu 7*91f16700Schasinglulu #include <arch.h> 8*91f16700Schasinglulu #include <arch_features.h> 9*91f16700Schasinglulu #include <arch_helpers.h> 10*91f16700Schasinglulu #include <lib/extensions/trf.h> 11*91f16700Schasinglulu 12*91f16700Schasinglulu void trf_init_el3(void) 13*91f16700Schasinglulu { 14*91f16700Schasinglulu u_register_t val; 15*91f16700Schasinglulu 16*91f16700Schasinglulu /* 17*91f16700Schasinglulu * MDCR_EL3.STE = b0 18*91f16700Schasinglulu * Trace prohibited in Secure state unless overridden by the 19*91f16700Schasinglulu * IMPLEMENTATION DEFINED authentication interface. 20*91f16700Schasinglulu * 21*91f16700Schasinglulu * MDCR_EL3.TTRF = b0 22*91f16700Schasinglulu * Allow access of trace filter control registers from NS-EL2 23*91f16700Schasinglulu * and NS-EL1 when NS-EL2 is implemented but not used 24*91f16700Schasinglulu */ 25*91f16700Schasinglulu val = read_mdcr_el3(); 26*91f16700Schasinglulu val &= ~(MDCR_STE_BIT | MDCR_TTRF_BIT); 27*91f16700Schasinglulu write_mdcr_el3(val); 28*91f16700Schasinglulu } 29*91f16700Schasinglulu 30*91f16700Schasinglulu void trf_init_el2_unused(void) 31*91f16700Schasinglulu { 32*91f16700Schasinglulu /* 33*91f16700Schasinglulu * MDCR_EL2.TTRF: Set to zero so that access to Trace 34*91f16700Schasinglulu * Filter Control register TRFCR_EL1 at EL1 is not 35*91f16700Schasinglulu * trapped to EL2. This bit is RES0 in versions of 36*91f16700Schasinglulu * the architecture earlier than ARMv8.4. 37*91f16700Schasinglulu * 38*91f16700Schasinglulu */ 39*91f16700Schasinglulu write_mdcr_el2(read_mdcr_el2() & ~MDCR_EL2_TTRF); 40*91f16700Schasinglulu } 41