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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_X86_64_INSTRUCTION_SET_FEATURES_X86_64_H_
     18 #define ART_RUNTIME_ARCH_X86_64_INSTRUCTION_SET_FEATURES_X86_64_H_
     19 
     20 #include "arch/x86/instruction_set_features_x86.h"
     21 
     22 namespace art {
     23 
     24 // Instruction set features relevant to the X86_64 architecture.
     25 class X86_64InstructionSetFeatures FINAL : public X86InstructionSetFeatures {
     26  public:
     27   // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures.
     28   static const X86_64InstructionSetFeatures* FromVariant(const std::string& variant,
     29                                                          std::string* error_msg) {
     30     return X86InstructionSetFeatures::FromVariant(variant, error_msg, true)
     31         ->AsX86_64InstructionSetFeatures();
     32   }
     33 
     34   // Parse a bitmap and create an InstructionSetFeatures.
     35   static const X86_64InstructionSetFeatures* FromBitmap(uint32_t bitmap) {
     36     return X86InstructionSetFeatures::FromBitmap(bitmap, true)->AsX86_64InstructionSetFeatures();
     37   }
     38 
     39   // Turn C pre-processor #defines into the equivalent instruction set features.
     40   static const X86_64InstructionSetFeatures* FromCppDefines() {
     41     return X86InstructionSetFeatures::FromCppDefines(true)->AsX86_64InstructionSetFeatures();
     42   }
     43 
     44   // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
     45   static const X86_64InstructionSetFeatures* FromCpuInfo() {
     46     return X86InstructionSetFeatures::FromCpuInfo(true)->AsX86_64InstructionSetFeatures();
     47   }
     48 
     49   // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
     50   // InstructionSetFeatures.
     51   static const X86_64InstructionSetFeatures* FromHwcap() {
     52     return X86InstructionSetFeatures::FromHwcap(true)->AsX86_64InstructionSetFeatures();
     53   }
     54 
     55   // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
     56   // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
     57   static const X86_64InstructionSetFeatures* FromAssembly() {
     58     return X86InstructionSetFeatures::FromAssembly(true)->AsX86_64InstructionSetFeatures();
     59   }
     60 
     61   InstructionSet GetInstructionSet() const OVERRIDE {
     62     return kX86_64;
     63   }
     64 
     65   virtual ~X86_64InstructionSetFeatures() {}
     66 
     67  protected:
     68   // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures.
     69   const InstructionSetFeatures*
     70       AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features,
     71                                  std::string* error_msg) const OVERRIDE {
     72     return X86InstructionSetFeatures::AddFeaturesFromSplitString(smp, features, true, error_msg);
     73   }
     74 
     75  private:
     76   X86_64InstructionSetFeatures(bool smp, bool has_SSSE3, bool has_SSE4_1, bool has_SSE4_2,
     77                                bool has_AVX, bool has_AVX2, bool prefers_locked_add,
     78                                bool has_POPCNT)
     79       : X86InstructionSetFeatures(smp, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX,
     80                                   has_AVX2, prefers_locked_add, has_POPCNT) {
     81   }
     82 
     83   friend class X86InstructionSetFeatures;
     84 
     85   DISALLOW_COPY_AND_ASSIGN(X86_64InstructionSetFeatures);
     86 };
     87 
     88 }  // namespace art
     89 
     90 #endif  // ART_RUNTIME_ARCH_X86_64_INSTRUCTION_SET_FEATURES_X86_64_H_
     91