hphp/util/cpuid.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15    */
  16 #pragma once
  17
  18 namespace HPHP {
  19
  20 enum class ProcessorFamily {
  21   Intel_SandyBridge,
  22   Intel_IvyBridge,
  23   Intel_Haswell,
  24   Intel_Broadwell,
  25   Intel_Skylake,
  26   Intel_Cooperlake,
  27   Unknown,
  28 };
  29
  30 ProcessorFamily getProcessorFamily() {
  31   ProcessorFamily f = ProcessorFamily::Unknown;
  32 #ifdef __x86_64__
  33 #define CPUID_FAMILY(x) ((((x) >> 8) & 0x0F) + (((x) >> 20) & 0xFF))
  34 #define CPUID_MODEL(x)  ((((x) >> 4) & 0x0F) | (((x) >> 12) & 0xF0))
  35   unsigned long x;
  36   asm volatile ("cpuid" : "=a"(x): "a"(1) : "ebx", "ecx", "edx");
  37   // This recognizes only certain CPU microarchitecture.  Anything predating
  38   // SandyBridge is not recognized.  Architecture for mobile processing are not
  39   // recognized (eg. Atom).  Any processor newer than Skylake is labeled as
  40   // Skylake.
  41   if (CPUID_FAMILY(x) == 6) {
  42     switch (CPUID_MODEL(x)) {
  43       case 0x2A:
  44       case 0x2D:
  45         f = ProcessorFamily::Intel_SandyBridge;
  46         break;
  47       case 0x3A:
  48       case 0x3E:
  49         f = ProcessorFamily::Intel_IvyBridge;
  50         break;
  51       case 0x3C:
  52       case 0x3F:
  53       case 0x45:
  54       case 0x46:
  55         f = ProcessorFamily::Intel_Haswell;
  56         break;
  57       case 0x3D:
  58       case 0x47:
  59       case 0x4F:
  60       case 0x56:
  61         f = ProcessorFamily::Intel_Broadwell;
  62         break;
  63       case 0x55:
  64         f = ProcessorFamily::Intel_Cooperlake;
  65         break;
  66       default:
  67         if (CPUID_MODEL(x) >= 0x5E) {
  68           // Any newer processors.  This is not correct.  New processors may
  69           // not fall into this case.  Model numbers are not monotonically
  70           // increasing.
  71           f = ProcessorFamily::Intel_Skylake;
  72         }
  73         break;
  74     }
  75   }
  76 #undef CPUID_FAMILY
  77 #undef CPUID_MODEL
  78 #endif
  79   return f;
  80 }
  81
  82 }
  83