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      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_MIPS64_INSTRUCTION_SET_FEATURES_MIPS64_H_
     18 #define ART_RUNTIME_ARCH_MIPS64_INSTRUCTION_SET_FEATURES_MIPS64_H_
     19 
     20 #include "arch/instruction_set_features.h"
     21 
     22 namespace art {
     23 
     24 class Mips64InstructionSetFeatures;
     25 using Mips64FeaturesUniquePtr = std::unique_ptr<const Mips64InstructionSetFeatures>;
     26 
     27 // Instruction set features relevant to the MIPS64 architecture.
     28 class Mips64InstructionSetFeatures FINAL : public InstructionSetFeatures {
     29  public:
     30   // Process a CPU variant string like "r4000" and create InstructionSetFeatures.
     31   static Mips64FeaturesUniquePtr FromVariant(const std::string& variant,
     32                                              std::string* error_msg);
     33 
     34   // Parse a bitmap and create an InstructionSetFeatures.
     35   static Mips64FeaturesUniquePtr FromBitmap(uint32_t bitmap);
     36 
     37   // Turn C pre-processor #defines into the equivalent instruction set features.
     38   static Mips64FeaturesUniquePtr FromCppDefines();
     39 
     40   // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
     41   static Mips64FeaturesUniquePtr FromCpuInfo();
     42 
     43   // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
     44   // InstructionSetFeatures.
     45   static Mips64FeaturesUniquePtr FromHwcap();
     46 
     47   // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
     48   // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
     49   static Mips64FeaturesUniquePtr FromAssembly();
     50 
     51   bool Equals(const InstructionSetFeatures* other) const OVERRIDE;
     52 
     53   InstructionSet GetInstructionSet() const OVERRIDE {
     54     return InstructionSet::kMips64;
     55   }
     56 
     57   uint32_t AsBitmap() const OVERRIDE;
     58 
     59   std::string GetFeatureString() const OVERRIDE;
     60 
     61   // Does it have MSA (MIPS SIMD Architecture) support.
     62   bool HasMsa() const {
     63     return msa_;
     64   }
     65 
     66   virtual ~Mips64InstructionSetFeatures() {}
     67 
     68  protected:
     69   // Parse a vector of the form "fpu32", "mips2" adding these to a new Mips64InstructionSetFeatures.
     70   std::unique_ptr<const InstructionSetFeatures>
     71       AddFeaturesFromSplitString(const std::vector<std::string>& features,
     72                                  std::string* error_msg) const OVERRIDE;
     73 
     74  private:
     75   explicit Mips64InstructionSetFeatures(bool msa) : InstructionSetFeatures(), msa_(msa) {
     76   }
     77 
     78   // Bitmap positions for encoding features as a bitmap.
     79   enum {
     80     kMsaBitfield = 1,
     81   };
     82 
     83   const bool msa_;
     84 
     85   DISALLOW_COPY_AND_ASSIGN(Mips64InstructionSetFeatures);
     86 };
     87 
     88 }  // namespace art
     89 
     90 #endif  // ART_RUNTIME_ARCH_MIPS64_INSTRUCTION_SET_FEATURES_MIPS64_H_
     91