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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'ipc/chromium/src/base/cpu.cc')
-rw-r--r--ipc/chromium/src/base/cpu.cc56
1 files changed, 56 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/cpu.cc b/ipc/chromium/src/base/cpu.cc
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+/* -*- 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