1 files changed, 56 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/cpu.cc b/ipc/chromium/src/base/cpu.cc
new file mode 100644
index 000000000..919b69bd0
--- /dev/null
+++ b/ipc/chromium/src/base/cpu.cc
@@ -0,0 +1,56 @@
+/* -*- 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