1  /*
 2   * Copyright (C) 2019 Apple Inc. All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   * 1. Redistributions of source code must retain the above copyright
 8   *    notice, this list of conditions and the following disclaimer.
 9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24   */
25  
26  #include "config.h"
27  #include "CPU.h"
28  
29  #if (CPU(X86) || CPU(X86_64)) && OS(DARWIN)
30  #include <mutex>
31  #include <sys/sysctl.h>
32  #endif
33  
34  namespace JSC {
35  
36  #if (CPU(X86) || CPU(X86_64)) && OS(DARWIN)
37  bool isKernTCSMAvailable()
38  {
39      if (!Options::useKernTCSM())
40          return false;
41  
42      uint32_t val = 0;
43      size_t valSize = sizeof(val);
44      int rc = sysctlbyname("kern.tcsm_available", &val, &valSize, nullptr, 0);
45      if (rc < 0)
46          return false;
47      return !!val;
48  }
49  
50  bool enableKernTCSM()
51  {
52      uint32_t val = 1;
53      int rc = sysctlbyname("kern.tcsm_enable", nullptr, nullptr, &val, sizeof(val));
54      if (rc < 0)
55          return false;
56      return true;
57  }
58  
59  int kernTCSMAwareNumberOfProcessorCores()
60  {
61      static std::once_flag onceFlag;
62      static int result;
63      std::call_once(onceFlag, [] {
64          result = WTF::numberOfProcessorCores();
65          if (result <= 1)
66              return;
67          if (isKernTCSMAvailable())
68              --result;
69      });
70      return result;
71  }
72  
73  int64_t hwL3CacheSize()
74  {
75      int64_t val = 0;
76      size_t valSize = sizeof(val);
77      int rc = sysctlbyname("hw.l3cachesize", &val, &valSize, nullptr, 0);
78      if (rc < 0)
79          return 0;
80      return val;
81  }
82  
83  int32_t hwPhysicalCPUMax()
84  {
85      int32_t val = 0;
86      size_t valSize = sizeof(val);
87      int rc = sysctlbyname("hw.physicalcpu_max", &val, &valSize, nullptr, 0);
88      if (rc < 0)
89          return 0;
90      return val;
91  }
92  
93  #endif // #if (CPU(X86) || CPU(X86_64)) && OS(DARWIN)
94  
95  } // namespace JSC