ipc/chromium/src/base/cpu.cc@6474c204b198
ipc/chromium/src/base/cpu.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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.
5 #include "base/cpu.h"
6 #include <intrin.h>
7 #include <string>
9 namespace base {
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 }
22 void CPU::Initialize() {
23 int cpu_info[4] = {-1};
24 char cpu_string[0x20];
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];
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 }
54 } // namespace base
