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1298f2f13d
This change adds "FEAT_BRBE" to be part of feature detection mechanism. Previously feature enablement flags were of boolean type, possessing either 0 or 1. With the introduction of feature detection procedure we now support three states for feature enablement build flags(0 to 2). Accordingly, "ENABLE_BRBE_FOR_NS" flag is now modified from boolean to numeric type to align with the feature detection. Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> Change-Id: I1eb52863b4afb10b808e2f0b6584a8a210d0f38c
27 lines
516 B
C
27 lines
516 B
C
/*
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* Copyright (c) 2022, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <arch_features.h>
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#include <arch_helpers.h>
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void brbe_enable(void)
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{
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uint64_t val;
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if (is_feat_brbe_present()) {
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/*
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* MDCR_EL3.SBRBE = 0b01
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*
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* Allows BRBE usage in non-secure world and prohibited in
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* secure world.
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*/
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val = read_mdcr_el3();
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val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT);
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val |= (0x1UL << MDCR_SBRBE_SHIFT);
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write_mdcr_el3(val);
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}
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}
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