1744ad974Sjohpow01 /* 2*123002f9SJayanth Dodderi Chidanand * Copyright (c) 2022-2024, Arm Limited. All rights reserved. 3744ad974Sjohpow01 * 4744ad974Sjohpow01 * SPDX-License-Identifier: BSD-3-Clause 5744ad974Sjohpow01 */ 6744ad974Sjohpow01 7744ad974Sjohpow01 #include <arch.h> 81298f2f1SJayanth Dodderi Chidanand #include <arch_features.h> 9744ad974Sjohpow01 #include <arch_helpers.h> 1060d330dcSBoyan Karatotev #include <lib/extensions/brbe.h> 11744ad974Sjohpow01 12*123002f9SJayanth Dodderi Chidanand void brbe_enable(cpu_context_t *ctx) 13744ad974Sjohpow01 { 14*123002f9SJayanth Dodderi Chidanand el3_state_t *state = get_el3state_ctx(ctx); 15*123002f9SJayanth Dodderi Chidanand u_register_t mdcr_el3_val = read_ctx_reg(state, CTX_MDCR_EL3); 16744ad974Sjohpow01 17744ad974Sjohpow01 /* 18744ad974Sjohpow01 * MDCR_EL3.SBRBE = 0b01 19744ad974Sjohpow01 * 20744ad974Sjohpow01 * Allows BRBE usage in non-secure world and prohibited in 21744ad974Sjohpow01 * secure world. 22744ad974Sjohpow01 */ 23*123002f9SJayanth Dodderi Chidanand mdcr_el3_val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT); 24*123002f9SJayanth Dodderi Chidanand mdcr_el3_val |= (0x1UL << MDCR_SBRBE_SHIFT); 25*123002f9SJayanth Dodderi Chidanand write_ctx_reg(state, CTX_MDCR_EL3, mdcr_el3_val); 26744ad974Sjohpow01 } 27