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// Copyright (c) 2011 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"
#if defined(ARCH_CPU_X86_FAMILY)
#if defined(_MSC_VER)
#include <intrin.h>
#endif
#endif
#include <string.h>
namespace base {
CPU::CPU()
: type_(0),
family_(0),
model_(0),
stepping_(0),
ext_model_(0),
ext_family_(0),
has_mmx_(false),
has_sse_(false),
has_sse2_(false),
has_sse3_(false),
has_ssse3_(false),
has_sse41_(false),
has_sse42_(false),
cpu_vendor_("unknown") {
Initialize();
}
#if defined(ARCH_CPU_X86_FAMILY)
#ifndef _MSC_VER
#if defined(__pic__) && defined(__i386__)
void __cpuid(int cpu_info[4], int info_type) {
__asm__ volatile (
"mov %%ebx, %%edi\n"
"cpuid\n"
"xchg %%edi, %%ebx\n"
: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type)
);
}
void __cpuidex(int cpu_info[4], int info_type, int info_index) {
__asm__ volatile (
"mov %%ebx, %%edi\n"
"cpuid\n"
"xchg %%edi, %%ebx\n"
: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type), "c"(info_index)
);
}
#else
void __cpuid(int cpu_info[4], int info_type) {
__asm__ volatile (
"cpuid \n\t"
: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type)
);
}
void __cpuidex(int cpu_info[4], int info_type, int info_index) {
__asm__ volatile (
"cpuid \n\t"
: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type), "c"(info_index)
);
}
#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];
// __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) + ((cpu_info[0] >> 12) & 0xf0);
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;
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;
}
#endif
}
} // namespace base
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