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.
FromVariant(const std::string & variant,std::string * error_msg)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.
FromBitmap(uint32_t bitmap)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.
FromCppDefines()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.
FromCpuInfo()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.
FromHwcap()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.
FromAssembly()57   static const X86_64InstructionSetFeatures* FromAssembly() {
58     return X86InstructionSetFeatures::FromAssembly(true)->AsX86_64InstructionSetFeatures();
59   }
60 
GetInstructionSet()61   InstructionSet GetInstructionSet() const OVERRIDE {
62     return kX86_64;
63   }
64 
~X86_64InstructionSetFeatures()65   virtual ~X86_64InstructionSetFeatures() {}
66 
67  protected:
68   // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures.
69   const InstructionSetFeatures*
AddFeaturesFromSplitString(const bool smp,const std::vector<std::string> & features,std::string * error_msg)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:
X86_64InstructionSetFeatures(bool smp,bool has_SSSE3,bool has_SSE4_1,bool has_SSE4_2,bool has_AVX,bool has_AVX2,bool prefers_locked_add,bool has_POPCNT)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