1744ad974Sjohpow01 /* 2744ad974Sjohpow01 * Copyright (c) 2022, Arm Limited. All rights reserved. 3744ad974Sjohpow01 * 4744ad974Sjohpow01 * SPDX-License-Identifier: BSD-3-Clause 5744ad974Sjohpow01 */ 6744ad974Sjohpow01 7744ad974Sjohpow01 #include <arch.h> 8*1298f2f1SJayanth Dodderi Chidanand #include <arch_features.h> 9744ad974Sjohpow01 #include <arch_helpers.h> 10744ad974Sjohpow01 11744ad974Sjohpow01 void brbe_enable(void) 12744ad974Sjohpow01 { 13744ad974Sjohpow01 uint64_t val; 14744ad974Sjohpow01 15*1298f2f1SJayanth Dodderi Chidanand if (is_feat_brbe_present()) { 16744ad974Sjohpow01 /* 17744ad974Sjohpow01 * MDCR_EL3.SBRBE = 0b01 18744ad974Sjohpow01 * 19744ad974Sjohpow01 * Allows BRBE usage in non-secure world and prohibited in 20744ad974Sjohpow01 * secure world. 21744ad974Sjohpow01 */ 22744ad974Sjohpow01 val = read_mdcr_el3(); 23744ad974Sjohpow01 val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT); 24744ad974Sjohpow01 val |= (0x1UL << MDCR_SBRBE_SHIFT); 25744ad974Sjohpow01 write_mdcr_el3(val); 26744ad974Sjohpow01 } 27744ad974Sjohpow01 } 28