1 /* 2 * Copyright (c) 2022, Arm Limited. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch.h> 8 #include <arch_features.h> 9 #include <arch_helpers.h> 10 11 void brbe_enable(void) 12 { 13 uint64_t val; 14 15 if (is_feat_brbe_present()) { 16 /* 17 * MDCR_EL3.SBRBE = 0b01 18 * 19 * Allows BRBE usage in non-secure world and prohibited in 20 * secure world. 21 */ 22 val = read_mdcr_el3(); 23 val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT); 24 val |= (0x1UL << MDCR_SBRBE_SHIFT); 25 write_mdcr_el3(val); 26 } 27 } 28