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comparison: security/sandbox/chromium/base/cpu.cc
security/sandbox/chromium/base/cpu.cc
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| -1:000000000000 | 0:8f0104e0640b |
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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 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/cpu.h" | |
| 6 | |
| 7 #include <string.h> | |
| 8 | |
| 9 #include <algorithm> | |
| 10 | |
| 11 #include "build/build_config.h" | |
| 12 | |
| 13 #if defined(ARCH_CPU_X86_FAMILY) | |
| 14 #if defined(_MSC_VER) | |
| 15 #include <intrin.h> | |
| 16 #endif | |
| 17 #endif | |
| 18 | |
| 19 namespace base { | |
| 20 | |
| 21 CPU::CPU() | |
| 22 : signature_(0), | |
| 23 type_(0), | |
| 24 family_(0), | |
| 25 model_(0), | |
| 26 stepping_(0), | |
| 27 ext_model_(0), | |
| 28 ext_family_(0), | |
| 29 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), | |
| 36 has_non_stop_time_stamp_counter_(false), | |
| 37 cpu_vendor_("unknown") { | |
| 38 Initialize(); | |
| 39 } | |
| 40 | |
| 41 #if defined(ARCH_CPU_X86_FAMILY) | |
| 42 #ifndef _MSC_VER | |
| 43 | |
| 44 #if defined(__pic__) && defined(__i386__) | |
| 45 | |
| 46 void __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 | |
| 56 void __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 | |
| 68 void __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 | |
| 76 void __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 | |
| 88 void CPU::Initialize() { | |
| 89 #if defined(ARCH_CPU_X86_FAMILY) | |
| 90 int cpu_info[4] = {-1}; | |
| 91 char cpu_string[48]; | |
| 92 | |
| 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 | |
| 96 // not in linear order. The code below arranges the information | |
| 97 // 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. | |
| 100 __cpuid(cpu_info, 0); | |
| 101 int num_ids = cpu_info[0]; | |
| 102 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])); | |
| 105 | |
| 106 // Interpret CPU feature information. | |
| 107 if (num_ids > 0) { | |
| 108 __cpuid(cpu_info, 1); | |
| 109 signature_ = cpu_info[0]; | |
| 110 stepping_ = cpu_info[0] & 0xf; | |
| 111 model_ = ((cpu_info[0] >> 4) & 0xf) + ((cpu_info[0] >> 12) & 0xf0); | |
| 112 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; | |
| 116 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; | |
| 123 has_avx_ = (cpu_info[2] & 0x10000000) != 0; | |
| 124 } | |
| 125 | |
| 126 // Get the brand string of the cpu. | |
| 127 __cpuid(cpu_info, 0x80000000); | |
| 128 const int parameter_end = 0x80000004; | |
| 129 int max_parameter = cpu_info[0]; | |
| 130 | |
| 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 } | |
| 142 | |
| 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 } | |
| 148 #endif | |
| 149 } | |
| 150 | |
| 151 CPU::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 | |
| 162 } // namespace base |
