/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base/cpu.h" #include <intrin.h> #include <string> namespace base { CPU::CPU() : type_(0), family_(0), model_(0), stepping_(0), ext_model_(0), ext_family_(0), cpu_vendor_("unknown") { Initialize(); } void CPU::Initialize() { int cpu_info[4] = {-1}; char cpu_string[0x20]; // __cpuid with an InfoType argument of 0 returns the number of // valid Ids in CPUInfo[0] and the CPU identification string in // the other three array elements. The CPU identification string is // not in linear order. The code below arranges the information // in a human readable form. // // More info can be found here: // http://msdn.microsoft.com/en-us/library/hskdteyh.aspx __cpuid(cpu_info, 0); int num_ids = cpu_info[0]; memset(cpu_string, 0, sizeof(cpu_string)); *(reinterpret_cast<int*>(cpu_string)) = cpu_info[1]; *(reinterpret_cast<int*>(cpu_string+4)) = cpu_info[3]; *(reinterpret_cast<int*>(cpu_string+8)) = cpu_info[2]; // Interpret CPU feature information. if (num_ids > 0) { __cpuid(cpu_info, 1); stepping_ = cpu_info[0] & 0xf; model_ = (cpu_info[0] >> 4) & 0xf; family_ = (cpu_info[0] >> 8) & 0xf; type_ = (cpu_info[0] >> 12) & 0x3; ext_model_ = (cpu_info[0] >> 16) & 0xf; ext_family_ = (cpu_info[0] >> 20) & 0xff; cpu_vendor_ = cpu_string; } } } // namespace base