1*91f16700Schasinglulu /* 2*91f16700Schasinglulu * Copyright (c) 2022-2023, 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/brbe.h> 11*91f16700Schasinglulu 12*91f16700Schasinglulu void brbe_init_el3(void) 13*91f16700Schasinglulu { 14*91f16700Schasinglulu uint64_t val; 15*91f16700Schasinglulu 16*91f16700Schasinglulu /* 17*91f16700Schasinglulu * MDCR_EL3.SBRBE = 0b01 18*91f16700Schasinglulu * 19*91f16700Schasinglulu * Allows BRBE usage in non-secure world and prohibited in 20*91f16700Schasinglulu * secure world. 21*91f16700Schasinglulu */ 22*91f16700Schasinglulu val = read_mdcr_el3(); 23*91f16700Schasinglulu val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT); 24*91f16700Schasinglulu val |= (0x1UL << MDCR_SBRBE_SHIFT); 25*91f16700Schasinglulu write_mdcr_el3(val); 26*91f16700Schasinglulu } 27