Ian Rogers | d582fa4 | 2014-11-05 23:46:43 -0800 | [diff] [blame] | 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 | // Instruction set features relevant to the ARM64 architecture. |
| 25 | class Arm64InstructionSetFeatures FINAL : public InstructionSetFeatures { |
| 26 | public: |
| 27 | // Process a CPU variant string like "krait" or "cortex-a15" and create InstructionSetFeatures. |
| 28 | static const Arm64InstructionSetFeatures* FromVariant(const std::string& variant, |
| 29 | std::string* error_msg); |
| 30 | |
| 31 | // Parse a bitmap and create an InstructionSetFeatures. |
| 32 | static const Arm64InstructionSetFeatures* FromBitmap(uint32_t bitmap); |
| 33 | |
| 34 | // Turn C pre-processor #defines into the equivalent instruction set features. |
| 35 | static const Arm64InstructionSetFeatures* FromCppDefines(); |
| 36 | |
| 37 | // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. |
| 38 | static const Arm64InstructionSetFeatures* FromCpuInfo(); |
| 39 | |
| 40 | // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce |
| 41 | // InstructionSetFeatures. |
| 42 | static const Arm64InstructionSetFeatures* FromHwcap(); |
| 43 | |
| 44 | // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the |
| 45 | // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. |
| 46 | static const Arm64InstructionSetFeatures* FromAssembly(); |
| 47 | |
| 48 | bool Equals(const InstructionSetFeatures* other) const OVERRIDE; |
| 49 | |
| 50 | InstructionSet GetInstructionSet() const OVERRIDE { |
| 51 | return kArm64; |
| 52 | } |
| 53 | |
| 54 | uint32_t AsBitmap() const OVERRIDE; |
| 55 | |
| 56 | // Return a string of the form "a53" or "none". |
| 57 | std::string GetFeatureString() const OVERRIDE; |
| 58 | |
| 59 | // Generate code addressing Cortex-A53 erratum 835769? |
| 60 | bool NeedFixCortexA53_835769() const { |
| 61 | return fix_cortex_a53_835769_; |
| 62 | } |
| 63 | |
Vladimir Marko | 20f8559 | 2015-03-19 10:07:02 +0000 | [diff] [blame^] | 64 | // Generate code addressing Cortex-A53 erratum 843419? |
| 65 | bool NeedFixCortexA53_843419() const { |
| 66 | return fix_cortex_a53_843419_; |
| 67 | } |
| 68 | |
Serban Constantinescu | 579885a | 2015-02-22 20:51:33 +0000 | [diff] [blame] | 69 | // TODO: Tune this on a per CPU basis. For now, we pessimistically assume |
| 70 | // that all ARM64 CPUs prefer explicit memory barriers over acquire-release. |
| 71 | // |
| 72 | // NOTE: This should not be the case! However we want to exercise the |
| 73 | // explicit memory barriers code paths in the Optimizing Compiler. |
| 74 | bool PreferAcquireRelease() const { |
| 75 | return false; |
| 76 | } |
| 77 | |
Ian Rogers | d582fa4 | 2014-11-05 23:46:43 -0800 | [diff] [blame] | 78 | virtual ~Arm64InstructionSetFeatures() {} |
| 79 | |
| 80 | protected: |
| 81 | // Parse a vector of the form "a53" adding these to a new ArmInstructionSetFeatures. |
| 82 | const InstructionSetFeatures* |
| 83 | AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features, |
| 84 | std::string* error_msg) const OVERRIDE; |
| 85 | |
| 86 | private: |
Vladimir Marko | 20f8559 | 2015-03-19 10:07:02 +0000 | [diff] [blame^] | 87 | explicit Arm64InstructionSetFeatures(bool smp, |
| 88 | bool needs_a53_835769_fix, |
| 89 | bool needs_a53_843419_fix) |
| 90 | : InstructionSetFeatures(smp), |
| 91 | fix_cortex_a53_835769_(needs_a53_835769_fix), |
| 92 | fix_cortex_a53_843419_(needs_a53_843419_fix) { |
Ian Rogers | d582fa4 | 2014-11-05 23:46:43 -0800 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | // Bitmap positions for encoding features as a bitmap. |
| 96 | enum { |
| 97 | kSmpBitfield = 1, |
| 98 | kA53Bitfield = 2, |
| 99 | }; |
| 100 | |
| 101 | const bool fix_cortex_a53_835769_; |
Vladimir Marko | 20f8559 | 2015-03-19 10:07:02 +0000 | [diff] [blame^] | 102 | const bool fix_cortex_a53_843419_; |
Ian Rogers | d582fa4 | 2014-11-05 23:46:43 -0800 | [diff] [blame] | 103 | |
| 104 | DISALLOW_COPY_AND_ASSIGN(Arm64InstructionSetFeatures); |
| 105 | }; |
| 106 | |
| 107 | } // namespace art |
| 108 | |
| 109 | #endif // ART_RUNTIME_ARCH_ARM64_INSTRUCTION_SET_FEATURES_ARM64_H_ |