1d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers/* 2d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * Copyright (C) 2014 The Android Open Source Project 3d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * 4d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * Licensed under the Apache License, Version 2.0 (the "License"); 5d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * you may not use this file except in compliance with the License. 6d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * You may obtain a copy of the License at 7d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * 8d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * http://www.apache.org/licenses/LICENSE-2.0 9d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * 10d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * Unless required by applicable law or agreed to in writing, software 11d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * distributed under the License is distributed on an "AS IS" BASIS, 12d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * See the License for the specific language governing permissions and 14d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers * limitations under the License. 15d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers */ 16d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 17d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers#ifndef ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 18d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers#define ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 19d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 20d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers#include "arch/instruction_set_features.h" 21d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 22d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogersnamespace art { 23d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 24d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers// Instruction set features relevant to the ARM64 architecture. 25d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogersclass Arm64InstructionSetFeatures FINAL : public InstructionSetFeatures { 26d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers public: 27d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Process a CPU variant string like "krait" or "cortex-a15" and create InstructionSetFeatures. 28d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromVariant(const std::string& variant, 29d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers std::string* error_msg); 30d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 31d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Parse a bitmap and create an InstructionSetFeatures. 32d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromBitmap(uint32_t bitmap); 33d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 34d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Turn C pre-processor #defines into the equivalent instruction set features. 35d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromCppDefines(); 36d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 37d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 38d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromCpuInfo(); 39d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 40d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 41d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // InstructionSetFeatures. 42d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromHwcap(); 43d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 44d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 45d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 46d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers static const Arm64InstructionSetFeatures* FromAssembly(); 47d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 48d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers bool Equals(const InstructionSetFeatures* other) const OVERRIDE; 49d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 50d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers InstructionSet GetInstructionSet() const OVERRIDE { 51d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers return kArm64; 52d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers } 53d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 54d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers uint32_t AsBitmap() const OVERRIDE; 55d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 56d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Return a string of the form "a53" or "none". 57d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers std::string GetFeatureString() const OVERRIDE; 58d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 59d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Generate code addressing Cortex-A53 erratum 835769? 60d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers bool NeedFixCortexA53_835769() const { 61d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers return fix_cortex_a53_835769_; 62d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers } 63d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 6420f85597828194c12be10d3a927999def066555eVladimir Marko // Generate code addressing Cortex-A53 erratum 843419? 6520f85597828194c12be10d3a927999def066555eVladimir Marko bool NeedFixCortexA53_843419() const { 6620f85597828194c12be10d3a927999def066555eVladimir Marko return fix_cortex_a53_843419_; 6720f85597828194c12be10d3a927999def066555eVladimir Marko } 6820f85597828194c12be10d3a927999def066555eVladimir Marko 69760d8efd535764e54500bf65a944ed3f2a54c123Serban Constantinescu // NOTE: This flag can be tunned on a CPU basis. In general all ARMv8 CPUs 70760d8efd535764e54500bf65a944ed3f2a54c123Serban Constantinescu // should prefer the Acquire-Release semantics over the explicit DMBs when 71760d8efd535764e54500bf65a944ed3f2a54c123Serban Constantinescu // handling load/store-volatile. For a specific use case see the ARM64 72760d8efd535764e54500bf65a944ed3f2a54c123Serban Constantinescu // Optimizing backend. 73579885a26d761f5ba9550f2a1cd7f0f598c2e1e3Serban Constantinescu bool PreferAcquireRelease() const { 74760d8efd535764e54500bf65a944ed3f2a54c123Serban Constantinescu return true; 75579885a26d761f5ba9550f2a1cd7f0f598c2e1e3Serban Constantinescu } 76579885a26d761f5ba9550f2a1cd7f0f598c2e1e3Serban Constantinescu 77d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers virtual ~Arm64InstructionSetFeatures() {} 78d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 79d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers protected: 80d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Parse a vector of the form "a53" adding these to a new ArmInstructionSetFeatures. 81d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers const InstructionSetFeatures* 82d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features, 83d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers std::string* error_msg) const OVERRIDE; 84d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 85d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers private: 8620f85597828194c12be10d3a927999def066555eVladimir Marko explicit Arm64InstructionSetFeatures(bool smp, 8720f85597828194c12be10d3a927999def066555eVladimir Marko bool needs_a53_835769_fix, 8820f85597828194c12be10d3a927999def066555eVladimir Marko bool needs_a53_843419_fix) 8920f85597828194c12be10d3a927999def066555eVladimir Marko : InstructionSetFeatures(smp), 9020f85597828194c12be10d3a927999def066555eVladimir Marko fix_cortex_a53_835769_(needs_a53_835769_fix), 9120f85597828194c12be10d3a927999def066555eVladimir Marko fix_cortex_a53_843419_(needs_a53_843419_fix) { 92d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers } 93d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 94d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers // Bitmap positions for encoding features as a bitmap. 95d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers enum { 96d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers kSmpBitfield = 1, 97d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers kA53Bitfield = 2, 98d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers }; 99d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 100d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers const bool fix_cortex_a53_835769_; 10120f85597828194c12be10d3a927999def066555eVladimir Marko const bool fix_cortex_a53_843419_; 102d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 103d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers DISALLOW_COPY_AND_ASSIGN(Arm64InstructionSetFeatures); 104d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers}; 105d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 106d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers} // namespace art 107d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers 108d582fa4ea62083a7598dded5b82dc2198b3daac7Ian Rogers#endif // ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ 109