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8fcd3d9600
Introduced a build flag 'ENABLE_TRF_FOR_NS' to enable trace filter control registers access in NS-EL2, or NS-EL1 (when NS-EL2 is implemented but unused). Change-Id: If3f53b8173a5573424b9a405a4bd8c206ffdeb8c Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
37 lines
718 B
C
37 lines
718 B
C
/*
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* Copyright (c) 2021, 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 <stdbool.h>
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#include <arch.h>
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#include <arch_helpers.h>
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#include <lib/extensions/trf.h>
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static bool trf_supported(void)
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{
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uint64_t features;
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features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEFILT_SHIFT;
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return ((features & ID_AA64DFR0_TRACEFILT_MASK) ==
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ID_AA64DFR0_TRACEFILT_SUPPORTED);
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}
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void trf_enable(void)
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{
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uint64_t val;
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if (trf_supported()) {
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/*
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* MDCR_EL3.TTRF = b0
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* Allow access of trace filter control registers from NS-EL2
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* and NS-EL1 when NS-EL2 is implemented but not used
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*/
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val = read_mdcr_el3();
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val &= ~MDCR_TTRF_BIT;
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write_mdcr_el3(val);
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}
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}
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