1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/cpu.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,54 @@
1.4 +// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/cpu.h"
1.9 +#include <intrin.h>
1.10 +#include <string>
1.11 +
1.12 +namespace base {
1.13 +
1.14 +CPU::CPU()
1.15 + : type_(0),
1.16 + family_(0),
1.17 + model_(0),
1.18 + stepping_(0),
1.19 + ext_model_(0),
1.20 + ext_family_(0),
1.21 + cpu_vendor_("unknown") {
1.22 + Initialize();
1.23 +}
1.24 +
1.25 +void CPU::Initialize() {
1.26 + int cpu_info[4] = {-1};
1.27 + char cpu_string[0x20];
1.28 +
1.29 + // __cpuid with an InfoType argument of 0 returns the number of
1.30 + // valid Ids in CPUInfo[0] and the CPU identification string in
1.31 + // the other three array elements. The CPU identification string is
1.32 + // not in linear order. The code below arranges the information
1.33 + // in a human readable form.
1.34 + //
1.35 + // More info can be found here:
1.36 + // http://msdn.microsoft.com/en-us/library/hskdteyh.aspx
1.37 + __cpuid(cpu_info, 0);
1.38 + int num_ids = cpu_info[0];
1.39 + memset(cpu_string, 0, sizeof(cpu_string));
1.40 + *(reinterpret_cast<int*>(cpu_string)) = cpu_info[1];
1.41 + *(reinterpret_cast<int*>(cpu_string+4)) = cpu_info[3];
1.42 + *(reinterpret_cast<int*>(cpu_string+8)) = cpu_info[2];
1.43 +
1.44 + // Interpret CPU feature information.
1.45 + if (num_ids > 0) {
1.46 + __cpuid(cpu_info, 1);
1.47 + stepping_ = cpu_info[0] & 0xf;
1.48 + model_ = (cpu_info[0] >> 4) & 0xf;
1.49 + family_ = (cpu_info[0] >> 8) & 0xf;
1.50 + type_ = (cpu_info[0] >> 12) & 0x3;
1.51 + ext_model_ = (cpu_info[0] >> 16) & 0xf;
1.52 + ext_family_ = (cpu_info[0] >> 20) & 0xff;
1.53 + cpu_vendor_ = cpu_string;
1.54 + }
1.55 +}
1.56 +
1.57 +} // namespace base
