Use the cpuid instruction to generate the CPU brand string. And

base/cpu.cc

 // Copyright (c) 2012 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 <string.h>
 
 #include "build/build_config.h"
 
@@ skipping 67 matching lines @@
 }
 
 #endif
 #endif  // _MSC_VER
 #endif  // ARCH_CPU_X86_FAMILY
 
 void CPU::Initialize() {
 #if defined(ARCH_CPU_X86_FAMILY)
   int cpu_info[4] = {-1};
   char cpu_string[0x20];
+  char cpu_brand[0x30];
 
   // __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);
@@ skipping 13 matching lines @@
     ext_model_ = (cpu_info[0] >> 16) & 0xf;
     ext_family_ = (cpu_info[0] >> 20) & 0xff;
     cpu_vendor_ = cpu_string;
     has_mmx_ = (cpu_info[3] & 0x00800000) != 0;
     has_sse_ = (cpu_info[3] & 0x02000000) != 0;
     has_sse2_ = (cpu_info[3] & 0x04000000) != 0;
     has_sse3_ = (cpu_info[2] & 0x00000001) != 0;
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
+
+    //get the brand string of the cpu.

[Zhenyao Mo, 2012/10/01 19:04:33]

one space after //

+    __cpuid(cpu_info, 0x80000000);
+
+    if (cpu_info[0] >= 0x80000004) {
+      memset(cpu_brand, 0, sizeof(cpu_brand));
+      int start_flag = 0x80000002;
+
+      for (int index = 0; index < 3; index++) {
+        __cpuid(cpu_info, start_flag + index);
+        *(reinterpret_cast<int*>(cpu_brand + index*16)) = cpu_info[0];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 4)) = cpu_info[1];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 8)) = cpu_info[2];
+        *(reinterpret_cast<int*>(cpu_brand + index*16 + 12)) = cpu_info[3];
+      }
+      cpu_brand_ = cpu_brand;
+    }
   }
 #endif
 }
 
 }  // namespace base