63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
// SPDX-FileCopyrightText: Copyright (c) 2023 merryhime <https://mary.rs>
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <cstdint>
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#include <optional>
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#include <sys/auxv.h>
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#include <sys/param.h>
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#include "oaknut/feature_detection/cpu_feature.hpp"
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#include "oaknut/feature_detection/feature_detection_hwcaps.hpp"
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#include "oaknut/feature_detection/id_registers.hpp"
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#include "oaknut/feature_detection/read_id_registers_directly.hpp"
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#ifndef AT_HWCAP
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# define AT_HWCAP 16
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#endif
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#ifndef AT_HWCAP2
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# define AT_HWCAP2 26
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#endif
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#if __FreeBSD_version < 1300114
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# error "Incompatible ABI change (incorrect HWCAP definitions on earlier FreeBSD versions)"
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#endif
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namespace oaknut {
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namespace detail {
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inline unsigned long getauxval(int aux)
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{
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unsigned long result = 0;
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if (::elf_aux_info(aux, &result, static_cast<int>(sizeof result)) == 0) {
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return result;
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}
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return 0;
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}
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} // namespace detail
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inline CpuFeatures detect_features_via_hwcap()
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{
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const unsigned long hwcap = detail::getauxval(AT_HWCAP);
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const unsigned long hwcap2 = detail::getauxval(AT_HWCAP2);
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return detect_features_via_hwcap(hwcap, hwcap2);
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}
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inline std::optional<id::IdRegisters> read_id_registers()
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{
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// HWCAP_CPUID is falsely not set on many FreeBSD kernel versions,
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// so we don't bother checking it.
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return id::read_id_registers_directly();
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}
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inline CpuFeatures detect_features()
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{
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return detect_features_via_hwcap();
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}
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} // namespace oaknut
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