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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef BASE_CPU_H_
      6 #define BASE_CPU_H_
      7 
      8 #include <string>
      9 
     10 #include "base/base_export.h"
     11 
     12 namespace base {
     13 
     14 // Query information about the processor.
     15 class BASE_EXPORT CPU {
     16  public:
     17   // Constructor
     18   CPU();
     19 
     20   enum IntelMicroArchitecture {
     21     PENTIUM,
     22     SSE,
     23     SSE2,
     24     SSE3,
     25     SSSE3,
     26     SSE41,
     27     SSE42,
     28     AVX,
     29     MAX_INTEL_MICRO_ARCHITECTURE
     30   };
     31 
     32   // Accessors for CPU information.
     33   const std::string& vendor_name() const { return cpu_vendor_; }
     34   int signature() const { return signature_; }
     35   int stepping() const { return stepping_; }
     36   int model() const { return model_; }
     37   int family() const { return family_; }
     38   int type() const { return type_; }
     39   int extended_model() const { return ext_model_; }
     40   int extended_family() const { return ext_family_; }
     41   bool has_mmx() const { return has_mmx_; }
     42   bool has_sse() const { return has_sse_; }
     43   bool has_sse2() const { return has_sse2_; }
     44   bool has_sse3() const { return has_sse3_; }
     45   bool has_ssse3() const { return has_ssse3_; }
     46   bool has_sse41() const { return has_sse41_; }
     47   bool has_sse42() const { return has_sse42_; }
     48   bool has_avx() const { return has_avx_; }
     49   // has_avx_hardware returns true when AVX is present in the CPU. This might
     50   // differ from the value of |has_avx()| because |has_avx()| also tests for
     51   // operating system support needed to actually call AVX instuctions.
     52   // Note: you should never need to call this function. It was added in order
     53   // to workaround a bug in NSS but |has_avx()| is what you want.
     54   bool has_avx_hardware() const { return has_avx_hardware_; }
     55   bool has_aesni() const { return has_aesni_; }
     56   bool has_non_stop_time_stamp_counter() const {
     57     return has_non_stop_time_stamp_counter_;
     58   }
     59   IntelMicroArchitecture GetIntelMicroArchitecture() const;
     60   const std::string& cpu_brand() const { return cpu_brand_; }
     61 
     62  private:
     63   // Query the processor for CPUID information.
     64   void Initialize();
     65 
     66   int signature_;  // raw form of type, family, model, and stepping
     67   int type_;  // process type
     68   int family_;  // family of the processor
     69   int model_;  // model of processor
     70   int stepping_;  // processor revision number
     71   int ext_model_;
     72   int ext_family_;
     73   bool has_mmx_;
     74   bool has_sse_;
     75   bool has_sse2_;
     76   bool has_sse3_;
     77   bool has_ssse3_;
     78   bool has_sse41_;
     79   bool has_sse42_;
     80   bool has_avx_;
     81   bool has_avx_hardware_;
     82   bool has_aesni_;
     83   bool has_non_stop_time_stamp_counter_;
     84   std::string cpu_vendor_;
     85   std::string cpu_brand_;
     86 };
     87 
     88 }  // namespace base
     89 
     90 #endif  // BASE_CPU_H_
     91