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1// Copyright 2016 The Chromium Authors
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/system/sys_info.h"
6
7#import <Foundation/Foundation.h>
8#include <mach/mach_host.h>
9#include <mach/mach_init.h>
10#include <stddef.h>
11#include <stdint.h>
12#include <sys/sysctl.h>
13#include <sys/types.h>
14
15#include "base/check_op.h"
16#include "base/feature_list.h"
17#include "base/mac/mac_util.h"
18#include "base/mac/scoped_mach_port.h"
19#include "base/notreached.h"
20#include "base/numerics/safe_conversions.h"
21#include "base/process/process_metrics.h"
22#include "base/strings/string_util.h"
23#include "base/strings/stringprintf.h"
24#include "base/system/sys_info_internal.h"
25#include "third_party/abseil-cpp/absl/types/optional.h"
26
27namespace base {
28
29namespace {
30
31bool g_is_cpu_security_mitigation_enabled = false;
32
33// Queries sysctlbyname() for the given key and returns the value from the
34// system or the empty string on failure.
35std::string GetSysctlStringValue(const char* key_name) {
36  char value[256];
37  size_t len = sizeof(value);
38  if (sysctlbyname(key_name, &value, &len, nullptr, 0) != 0)
39    return std::string();
40  DCHECK_GE(len, 1u);
41  DCHECK_LE(len, sizeof(value));
42  DCHECK_EQ('\0', value[len - 1]);
43  return std::string(value, len - 1);
44}
45
46}  // namespace
47
48namespace internal {
49
50absl::optional<int> NumberOfPhysicalProcessors() {
51  return GetSysctlIntValue("hw.physicalcpu_max");
52}
53
54absl::optional<int> NumberOfProcessorsWhenCpuSecurityMitigationEnabled() {
55  if (!g_is_cpu_security_mitigation_enabled ||
56      !FeatureList::IsEnabled(kNumberOfCoresWithCpuSecurityMitigation)) {
57    return absl::nullopt;
58  }
59  return NumberOfPhysicalProcessors();
60}
61
62}  // namespace internal
63
64BASE_FEATURE(kNumberOfCoresWithCpuSecurityMitigation,
65             "NumberOfCoresWithCpuSecurityMitigation",
66             FEATURE_DISABLED_BY_DEFAULT);
67
68// static
69std::string SysInfo::OperatingSystemName() {
70  return "Mac OS X";
71}
72
73// static
74std::string SysInfo::OperatingSystemVersion() {
75  int32_t major, minor, bugfix;
76  OperatingSystemVersionNumbers(&major, &minor, &bugfix);
77  return base::StringPrintf("%d.%d.%d", major, minor, bugfix);
78}
79
80// static
81void SysInfo::OperatingSystemVersionNumbers(int32_t* major_version,
82                                            int32_t* minor_version,
83                                            int32_t* bugfix_version) {
84  NSOperatingSystemVersion version =
85      [[NSProcessInfo processInfo] operatingSystemVersion];
86  *major_version = saturated_cast<int32_t>(version.majorVersion);
87  *minor_version = saturated_cast<int32_t>(version.minorVersion);
88  *bugfix_version = saturated_cast<int32_t>(version.patchVersion);
89}
90
91// static
92std::string SysInfo::OperatingSystemArchitecture() {
93  switch (mac::GetCPUType()) {
94    case mac::CPUType::kIntel:
95      return "x86_64";
96    case mac::CPUType::kTranslatedIntel:
97    case mac::CPUType::kArm:
98      return "arm64";
99  }
100}
101
102// static
103uint64_t SysInfo::AmountOfPhysicalMemoryImpl() {
104  struct host_basic_info hostinfo;
105  mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
106  base::mac::ScopedMachSendRight host(mach_host_self());
107  int result = host_info(host.get(), HOST_BASIC_INFO,
108                         reinterpret_cast<host_info_t>(&hostinfo), &count);
109  if (result != KERN_SUCCESS) {
110    NOTREACHED();
111    return 0;
112  }
113  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
114  return hostinfo.max_mem;
115}
116
117// static
118uint64_t SysInfo::AmountOfAvailablePhysicalMemoryImpl() {
119  SystemMemoryInfoKB info;
120  if (!GetSystemMemoryInfo(&info))
121    return 0;
122  // We should add inactive file-backed memory also but there is no such
123  // information from Mac OS unfortunately.
124  return checked_cast<uint64_t>(info.free + info.speculative) * 1024;
125}
126
127// static
128std::string SysInfo::CPUModelName() {
129  return GetSysctlStringValue("machdep.cpu.brand_string");
130}
131
132// static
133std::string SysInfo::HardwareModelName() {
134  return GetSysctlStringValue("hw.model");
135}
136
137// static
138SysInfo::HardwareInfo SysInfo::GetHardwareInfoSync() {
139  HardwareInfo info;
140  info.manufacturer = "Apple Inc.";
141  info.model = HardwareModelName();
142  DCHECK(IsStringUTF8(info.manufacturer));
143  DCHECK(IsStringUTF8(info.model));
144  return info;
145}
146
147// static
148void SysInfo::SetIsCpuSecurityMitigationsEnabled(bool is_enabled) {
149  g_is_cpu_security_mitigation_enabled = is_enabled;
150}
151
152}  // namespace base
153