The Tor Browser / file comparison
comparison: ipc/chromium/src/base/cpu.cc
ipc/chromium/src/base/cpu.cc
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:cc57a8d8ea0d |
|---|---|
| 1 // Copyright (c) 2006-2008 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 #include <intrin.h> | |
| 7 #include <string> | |
| 8 | |
| 9 namespace base { | |
| 10 | |
| 11 CPU::CPU() | |
| 12 : type_(0), | |
| 13 family_(0), | |
| 14 model_(0), | |
| 15 stepping_(0), | |
| 16 ext_model_(0), | |
| 17 ext_family_(0), | |
| 18 cpu_vendor_("unknown") { | |
| 19 Initialize(); | |
| 20 } | |
| 21 | |
| 22 void CPU::Initialize() { | |
| 23 int cpu_info[4] = {-1}; | |
| 24 char cpu_string[0x20]; | |
| 25 | |
| 26 // __cpuid with an InfoType argument of 0 returns the number of | |
| 27 // valid Ids in CPUInfo[0] and the CPU identification string in | |
| 28 // the other three array elements. The CPU identification string is | |
| 29 // not in linear order. The code below arranges the information | |
| 30 // in a human readable form. | |
| 31 // | |
| 32 // More info can be found here: | |
| 33 // http://msdn.microsoft.com/en-us/library/hskdteyh.aspx | |
| 34 __cpuid(cpu_info, 0); | |
| 35 int num_ids = cpu_info[0]; | |
| 36 memset(cpu_string, 0, sizeof(cpu_string)); | |
| 37 *(reinterpret_cast<int*>(cpu_string)) = cpu_info[1]; | |
| 38 *(reinterpret_cast<int*>(cpu_string+4)) = cpu_info[3]; | |
| 39 *(reinterpret_cast<int*>(cpu_string+8)) = cpu_info[2]; | |
| 40 | |
| 41 // Interpret CPU feature information. | |
| 42 if (num_ids > 0) { | |
| 43 __cpuid(cpu_info, 1); | |
| 44 stepping_ = cpu_info[0] & 0xf; | |
| 45 model_ = (cpu_info[0] >> 4) & 0xf; | |
| 46 family_ = (cpu_info[0] >> 8) & 0xf; | |
| 47 type_ = (cpu_info[0] >> 12) & 0x3; | |
| 48 ext_model_ = (cpu_info[0] >> 16) & 0xf; | |
| 49 ext_family_ = (cpu_info[0] >> 20) & 0xff; | |
| 50 cpu_vendor_ = cpu_string; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 } // namespace base |
