85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_RISCV64_INSTRUCTION_SET_FEATURES_RISCV64_H_
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#define ART_RUNTIME_ARCH_RISCV64_INSTRUCTION_SET_FEATURES_RISCV64_H_
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#include "arch/instruction_set_features.h"
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namespace art {
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class Riscv64InstructionSetFeatures;
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using Riscv64FeaturesUniquePtr = std::unique_ptr<const Riscv64InstructionSetFeatures>;
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// Instruction set features relevant to the RISCV64 architecture.
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class Riscv64InstructionSetFeatures final : public InstructionSetFeatures {
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public:
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// Bitmap positions for encoding features as a bitmap.
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enum {
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kExtGeneric = (1 << 0), // G extension covers the basic set IMAFD
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kExtCompressed = (1 << 1), // C extension adds compressed instructions
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kExtVector = (1 << 2) // V extension adds vector instructions
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};
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static Riscv64FeaturesUniquePtr FromVariant(const std::string& variant, std::string* error_msg);
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// Parse a bitmap and create an InstructionSetFeatures.
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static Riscv64FeaturesUniquePtr FromBitmap(uint32_t bitmap);
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// Turn C pre-processor #defines into the equivalent instruction set features.
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static Riscv64FeaturesUniquePtr FromCppDefines();
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// Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
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static Riscv64FeaturesUniquePtr FromCpuInfo();
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// Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
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// InstructionSetFeatures.
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static Riscv64FeaturesUniquePtr FromHwcap();
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// Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
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// InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
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static Riscv64FeaturesUniquePtr FromAssembly();
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// Use external cpu_features library.
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static Riscv64FeaturesUniquePtr FromCpuFeatures();
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bool Equals(const InstructionSetFeatures* other) const override;
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InstructionSet GetInstructionSet() const override { return InstructionSet::kRiscv64; }
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uint32_t AsBitmap() const override;
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std::string GetFeatureString() const override;
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virtual ~Riscv64InstructionSetFeatures() {}
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protected:
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std::unique_ptr<const InstructionSetFeatures> AddFeaturesFromSplitString(
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const std::vector<std::string>& features, std::string* error_msg) const override;
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private:
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explicit Riscv64InstructionSetFeatures(uint32_t bits) : InstructionSetFeatures(), bits_(bits) {}
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// Extension bitmap.
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const uint32_t bits_;
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DISALLOW_COPY_AND_ASSIGN(Riscv64InstructionSetFeatures);
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};
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} // namespace art
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#endif // ART_RUNTIME_ARCH_RISCV64_INSTRUCTION_SET_FEATURES_RISCV64_H_
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