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 class X86_64InstructionSetFeatures;
25 using X86_64FeaturesUniquePtr = std::unique_ptr<const X86_64InstructionSetFeatures>;
26 
27 // Instruction set features relevant to the X86_64 architecture.
28 class X86_64InstructionSetFeatures final : public X86InstructionSetFeatures {
29  public:
30   // Process a CPU variant string like "atom" or "nehalem" and create InstructionSetFeatures.
FromVariant(const std::string & variant,std::string * error_msg)31   static X86_64FeaturesUniquePtr FromVariant(const std::string& variant, std::string* error_msg) {
32     return Convert(X86InstructionSetFeatures::FromVariant(variant, error_msg, true));
33   }
34 
35   // Parse a bitmap and create an InstructionSetFeatures.
FromBitmap(uint32_t bitmap)36   static X86_64FeaturesUniquePtr FromBitmap(uint32_t bitmap) {
37     return Convert(X86InstructionSetFeatures::FromBitmap(bitmap, true));
38   }
39 
40   // Turn C pre-processor #defines into the equivalent instruction set features.
FromCppDefines()41   static X86_64FeaturesUniquePtr FromCppDefines() {
42     return Convert(X86InstructionSetFeatures::FromCppDefines(true));
43   }
44 
45   // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
FromCpuInfo()46   static X86_64FeaturesUniquePtr FromCpuInfo() {
47     return Convert(X86InstructionSetFeatures::FromCpuInfo(true));
48   }
49 
50   // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
51   // InstructionSetFeatures.
FromHwcap()52   static X86_64FeaturesUniquePtr FromHwcap() {
53     return Convert(X86InstructionSetFeatures::FromHwcap(true));
54   }
55 
56   // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
57   // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
FromAssembly()58   static X86_64FeaturesUniquePtr FromAssembly() {
59     return Convert(X86InstructionSetFeatures::FromAssembly(true));
60   }
61 
GetInstructionSet()62   InstructionSet GetInstructionSet() const override {
63     return InstructionSet::kX86_64;
64   }
65 
~X86_64InstructionSetFeatures()66   virtual ~X86_64InstructionSetFeatures() {}
67 
68  protected:
69   // Parse a string of the form "ssse3" adding these to a new InstructionSetFeatures.
70   std::unique_ptr<const InstructionSetFeatures>
AddFeaturesFromSplitString(const std::vector<std::string> & features,std::string * error_msg)71       AddFeaturesFromSplitString(const std::vector<std::string>& features,
72                                  std::string* error_msg) const override {
73     return X86InstructionSetFeatures::AddFeaturesFromSplitString(features, true, error_msg);
74   }
75 
76  private:
X86_64InstructionSetFeatures(bool has_SSSE3,bool has_SSE4_1,bool has_SSE4_2,bool has_AVX,bool has_AVX2,bool has_POPCNT)77   X86_64InstructionSetFeatures(bool has_SSSE3,
78                                bool has_SSE4_1,
79                                bool has_SSE4_2,
80                                bool has_AVX,
81                                bool has_AVX2,
82                                bool has_POPCNT)
83       : X86InstructionSetFeatures(has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX,
84                                   has_AVX2, has_POPCNT) {
85   }
86 
Convert(X86FeaturesUniquePtr && in)87   static X86_64FeaturesUniquePtr Convert(X86FeaturesUniquePtr&& in) {
88     return X86_64FeaturesUniquePtr(in.release()->AsX86_64InstructionSetFeatures());
89   }
90 
91   friend class X86InstructionSetFeatures;
92 
93   DISALLOW_COPY_AND_ASSIGN(X86_64InstructionSetFeatures);
94 };
95 
96 }  // namespace art
97 
98 #endif  // ART_RUNTIME_ARCH_X86_64_INSTRUCTION_SET_FEATURES_X86_64_H_
99