1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 18 #define ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 19 20 #include "arch/instruction_set_features.h" 21 22 namespace art { 23 24 class Arm64InstructionSetFeatures; 25 using Arm64FeaturesUniquePtr = std::unique_ptr<const Arm64InstructionSetFeatures>; 26 27 // Instruction set features relevant to the ARM64 architecture. 28 class Arm64InstructionSetFeatures FINAL : public InstructionSetFeatures { 29 public: 30 // Process a CPU variant string like "krait" or "cortex-a15" and create InstructionSetFeatures. 31 static Arm64FeaturesUniquePtr FromVariant(const std::string& variant, std::string* error_msg); 32 33 // Parse a bitmap and create an InstructionSetFeatures. 34 static Arm64FeaturesUniquePtr FromBitmap(uint32_t bitmap); 35 36 // Turn C pre-processor #defines into the equivalent instruction set features. 37 static Arm64FeaturesUniquePtr FromCppDefines(); 38 39 // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 40 static Arm64FeaturesUniquePtr FromCpuInfo(); 41 42 // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 43 // InstructionSetFeatures. 44 static Arm64FeaturesUniquePtr FromHwcap(); 45 46 // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 47 // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 48 static Arm64FeaturesUniquePtr FromAssembly(); 49 50 bool Equals(const InstructionSetFeatures* other) const OVERRIDE; 51 52 InstructionSet GetInstructionSet() const OVERRIDE { 53 return InstructionSet::kArm64; 54 } 55 56 uint32_t AsBitmap() const OVERRIDE; 57 58 // Return a string of the form "a53" or "none". 59 std::string GetFeatureString() const OVERRIDE; 60 61 // Generate code addressing Cortex-A53 erratum 835769? 62 bool NeedFixCortexA53_835769() const { 63 return fix_cortex_a53_835769_; 64 } 65 66 // Generate code addressing Cortex-A53 erratum 843419? 67 bool NeedFixCortexA53_843419() const { 68 return fix_cortex_a53_843419_; 69 } 70 71 virtual ~Arm64InstructionSetFeatures() {} 72 73 protected: 74 // Parse a vector of the form "a53" adding these to a new ArmInstructionSetFeatures. 75 std::unique_ptr<const InstructionSetFeatures> 76 AddFeaturesFromSplitString(const std::vector<std::string>& features, 77 std::string* error_msg) const OVERRIDE; 78 79 private: 80 Arm64InstructionSetFeatures(bool needs_a53_835769_fix, bool needs_a53_843419_fix) 81 : InstructionSetFeatures(), 82 fix_cortex_a53_835769_(needs_a53_835769_fix), 83 fix_cortex_a53_843419_(needs_a53_843419_fix) { 84 } 85 86 // Bitmap positions for encoding features as a bitmap. 87 enum { 88 kA53Bitfield = 1 << 0, 89 }; 90 91 const bool fix_cortex_a53_835769_; 92 const bool fix_cortex_a53_843419_; 93 94 DISALLOW_COPY_AND_ASSIGN(Arm64InstructionSetFeatures); 95 }; 96 97 } // namespace art 98 99 #endif // ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 100
