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
34namespace JSC {
35
36#if (CPU(X86) || CPU(X86_64)) && OS(DARWIN)
37bool 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, NULL, 0);
45 if (rc < 0)
46 return false;
47 return !!val;
48}
49
50bool enableKernTCSM()
51{
52 uint32_t val = 1;
53 int rc = sysctlbyname("kern.tcsm_enable", NULL, 0, &val, sizeof(val));
54 if (rc < 0)
55 return false;
56 return true;
57}
58
59int 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
73int64_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
83int32_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
96