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https://github.com/ARM-software/arm-trusted-firmware.git
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fc8d2d3980
At the moment we only support FEAT_TRF to be either unconditionally compiled in, or to be not supported at all. Add support for runtime detection (ENABLE_TRF_FOR_NS=2), by splitting is_feat_trf_present() into an ID register reading function and a second function to report the support status. That function considers both build time settings and runtime information (if needed), and is used before we access TRF related registers. Also move the context saving code from assembly to C, and use the new is_feat_trf_supported() function to guard its execution. The FVP platform decided to compile in support unconditionally (=1), even though FEAT_TRF is an ARMv8.4 feature, so is not available with the FVP model's default command line. Change that to the now supported dynamic option (=2), so the right decision can be made by the code at runtime. Change-Id: Ia97b01adbe24970a4d837afd463dc5506b7295a3 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
46 lines
958 B
C
46 lines
958 B
C
/*
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* Copyright (c) 2019-2023, 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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#ifndef ARCH_FEATURES_H
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#define ARCH_FEATURES_H
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#include <stdbool.h>
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#include <arch_helpers.h>
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#include <common/feat_detect.h>
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#define ISOLATE_FIELD(reg, feat) \
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((unsigned int)(((reg) >> (feat ## _SHIFT)) & (feat ## _MASK)))
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static inline bool is_armv7_gentimer_present(void)
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{
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return ISOLATE_FIELD(read_id_pfr1(), ID_PFR1_GENTIMER) != 0U;
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}
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static inline bool is_armv8_2_ttcnp_present(void)
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{
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return ISOLATE_FIELD(read_id_mmfr4(), ID_MMFR4_CNP) != 0U;
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}
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static inline unsigned int read_feat_trf_id_field(void)
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{
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return ISOLATE_FIELD(read_id_dfr0(), ID_DFR0_TRACEFILT);
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}
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static inline bool is_feat_trf_supported(void)
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{
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if (ENABLE_TRF_FOR_NS == FEAT_STATE_DISABLED) {
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return false;
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}
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if (ENABLE_TRF_FOR_NS == FEAT_STATE_ALWAYS) {
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return true;
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}
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return read_feat_trf_id_field() != 0U;
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}
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#endif /* ARCH_FEATURES_H */
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