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// 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
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