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[email protected]d1811bc2012-03-31 07:08:531// Copyright (c) 2012 The Chromium Authors. All rights reserved.
[email protected]de8d26672008-09-25 22:08:442// 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/cpu.h"
[email protected]7e6d42b2011-02-16 18:51:586
[email protected]d1811bc2012-03-31 07:08:537#include <string.h>
8
[email protected]595d1592012-10-04 21:05:239#include <algorithm>
10
[email protected]d1811bc2012-03-31 07:08:5311#include "build/build_config.h"
12
[email protected]7e6d42b2011-02-16 18:51:5813#if defined(ARCH_CPU_X86_FAMILY)
14#if defined(_MSC_VER)
[email protected]de8d26672008-09-25 22:08:4415#include <intrin.h>
[email protected]7e6d42b2011-02-16 18:51:5816#endif
17#endif
18
[email protected]de8d26672008-09-25 22:08:4419namespace base {
20
21CPU::CPU()
[email protected]5c8f89f692013-07-18 11:13:2822 : signature_(0),
23 type_(0),
[email protected]de8d26672008-09-25 22:08:4424 family_(0),
25 model_(0),
26 stepping_(0),
27 ext_model_(0),
28 ext_family_(0),
[email protected]7e6d42b2011-02-16 18:51:5829 has_mmx_(false),
30 has_sse_(false),
31 has_sse2_(false),
32 has_sse3_(false),
33 has_ssse3_(false),
34 has_sse41_(false),
35 has_sse42_(false),
[email protected]aa312812013-04-30 19:46:0536 has_non_stop_time_stamp_counter_(false),
[email protected]de8d26672008-09-25 22:08:4437 cpu_vendor_("unknown") {
38 Initialize();
39}
40
[email protected]7e6d42b2011-02-16 18:51:5841#if defined(ARCH_CPU_X86_FAMILY)
42#ifndef _MSC_VER
43
44#if defined(__pic__) && defined(__i386__)
45
46void __cpuid(int cpu_info[4], int info_type) {
47 __asm__ volatile (
48 "mov %%ebx, %%edi\n"
49 "cpuid\n"
50 "xchg %%edi, %%ebx\n"
51 : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
52 : "a"(info_type)
53 );
54}
55
56void __cpuidex(int cpu_info[4], int info_type, int info_index) {
57 __asm__ volatile (
58 "mov %%ebx, %%edi\n"
59 "cpuid\n"
60 "xchg %%edi, %%ebx\n"
61 : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
62 : "a"(info_type), "c"(info_index)
63 );
64}
65
66#else
67
68void __cpuid(int cpu_info[4], int info_type) {
69 __asm__ volatile (
70 "cpuid \n\t"
71 : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
72 : "a"(info_type)
73 );
74}
75
76void __cpuidex(int cpu_info[4], int info_type, int info_index) {
77 __asm__ volatile (
78 "cpuid \n\t"
79 : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
80 : "a"(info_type), "c"(info_index)
81 );
82}
83
84#endif
85#endif // _MSC_VER
86#endif // ARCH_CPU_X86_FAMILY
87
[email protected]de8d26672008-09-25 22:08:4488void CPU::Initialize() {
[email protected]7e6d42b2011-02-16 18:51:5889#if defined(ARCH_CPU_X86_FAMILY)
[email protected]de8d26672008-09-25 22:08:4490 int cpu_info[4] = {-1};
[email protected]595d1592012-10-04 21:05:2391 char cpu_string[48];
[email protected]de8d26672008-09-25 22:08:4492
93 // __cpuid with an InfoType argument of 0 returns the number of
94 // valid Ids in CPUInfo[0] and the CPU identification string in
95 // the other three array elements. The CPU identification string is
[email protected]52a261f2009-03-03 15:01:1296 // not in linear order. The code below arranges the information
[email protected]595d1592012-10-04 21:05:2397 // in a human readable form. The human readable order is CPUInfo[1] |
98 // CPUInfo[3] | CPUInfo[2]. CPUInfo[2] and CPUInfo[3] are swapped
99 // before using memcpy to copy these three array elements to cpu_string.
[email protected]de8d26672008-09-25 22:08:44100 __cpuid(cpu_info, 0);
101 int num_ids = cpu_info[0];
[email protected]595d1592012-10-04 21:05:23102 std::swap(cpu_info[2], cpu_info[3]);
103 memcpy(cpu_string, &cpu_info[1], 3 * sizeof(cpu_info[1]));
104 cpu_vendor_.assign(cpu_string, 3 * sizeof(cpu_info[1]));
[email protected]de8d26672008-09-25 22:08:44105
106 // Interpret CPU feature information.
[email protected]7f0813642008-09-26 23:26:34107 if (num_ids > 0) {
108 __cpuid(cpu_info, 1);
[email protected]5c8f89f692013-07-18 11:13:28109 signature_ = cpu_info[0];
[email protected]7f0813642008-09-26 23:26:34110 stepping_ = cpu_info[0] & 0xf;
[email protected]7e6d42b2011-02-16 18:51:58111 model_ = ((cpu_info[0] >> 4) & 0xf) + ((cpu_info[0] >> 12) & 0xf0);
[email protected]7f0813642008-09-26 23:26:34112 family_ = (cpu_info[0] >> 8) & 0xf;
113 type_ = (cpu_info[0] >> 12) & 0x3;
114 ext_model_ = (cpu_info[0] >> 16) & 0xf;
115 ext_family_ = (cpu_info[0] >> 20) & 0xff;
[email protected]7e6d42b2011-02-16 18:51:58116 has_mmx_ = (cpu_info[3] & 0x00800000) != 0;
117 has_sse_ = (cpu_info[3] & 0x02000000) != 0;
118 has_sse2_ = (cpu_info[3] & 0x04000000) != 0;
119 has_sse3_ = (cpu_info[2] & 0x00000001) != 0;
120 has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
121 has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
122 has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
[email protected]5016a9dd2013-02-02 01:10:02123 has_avx_ = (cpu_info[2] & 0x10000000) != 0;
[email protected]7f0813642008-09-26 23:26:34124 }
[email protected]595d1592012-10-04 21:05:23125
126 // Get the brand string of the cpu.
127 __cpuid(cpu_info, 0x80000000);
128 const int parameter_end = 0x80000004;
[email protected]aa312812013-04-30 19:46:05129 int max_parameter = cpu_info[0];
[email protected]595d1592012-10-04 21:05:23130
131 if (cpu_info[0] >= parameter_end) {
132 char* cpu_string_ptr = cpu_string;
133
134 for (int parameter = 0x80000002; parameter <= parameter_end &&
135 cpu_string_ptr < &cpu_string[sizeof(cpu_string)]; parameter++) {
136 __cpuid(cpu_info, parameter);
137 memcpy(cpu_string_ptr, cpu_info, sizeof(cpu_info));
138 cpu_string_ptr += sizeof(cpu_info);
139 }
140 cpu_brand_.assign(cpu_string, cpu_string_ptr - cpu_string);
141 }
[email protected]aa312812013-04-30 19:46:05142
143 const int parameter_containing_non_stop_time_stamp_counter = 0x80000007;
144 if (max_parameter >= parameter_containing_non_stop_time_stamp_counter) {
145 __cpuid(cpu_info, parameter_containing_non_stop_time_stamp_counter);
146 has_non_stop_time_stamp_counter_ = (cpu_info[3] & (1 << 8)) != 0;
147 }
[email protected]7e6d42b2011-02-16 18:51:58148#endif
[email protected]de8d26672008-09-25 22:08:44149}
150
[email protected]5016a9dd2013-02-02 01:10:02151CPU::IntelMicroArchitecture CPU::GetIntelMicroArchitecture() const {
152 if (has_avx()) return AVX;
153 if (has_sse42()) return SSE42;
154 if (has_sse41()) return SSE41;
155 if (has_ssse3()) return SSSE3;
156 if (has_sse3()) return SSE3;
157 if (has_sse2()) return SSE2;
158 if (has_sse()) return SSE;
159 return PENTIUM;
160}
161
[email protected]de8d26672008-09-25 22:08:44162} // namespace base