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Check for cpu items before assuming it will work.

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Review URL: http://codereview.chromium.org/3804

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2653 0039d316-1c4b-4281-b951-d872f2087c98
This commit is contained in:
mbelshe@google.com
2008-09-26 23:26:34 +00:00
parent 49a14c715d
commit 7f081364c5
1 changed files with 10 additions and 8 deletions

18
base/cpu.cc

@ -39,14 +39,16 @@ void CPU::Initialize() {
*(reinterpret_cast<int*>(cpu_string+8)) = cpu_info[2];
// Interpret CPU feature information.
__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;
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