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// 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.
#ifndef BASE_CPU_H_
#define BASE_CPU_H_
#include <string>
#include <tuple>
#include <vector>
#include "base/base_export.h"
#include "base/time/time.h"
#include "build/build_config.h"
namespace base {
#if defined(ARCH_CPU_X86_FAMILY)
namespace internal {
// Compute the CPU family and model based on the vendor and CPUID signature.
// Returns in order: family, model, extended family, extended model.
BASE_EXPORT std::tuple<int, int, int, int> ComputeX86FamilyAndModel(
const std::string& vendor,
int signature);
} // namespace internal
#endif // defined(ARCH_CPU_X86_FAMILY)
// Query information about the processor.
class BASE_EXPORT CPU final {
public:
CPU();
enum IntelMicroArchitecture {
PENTIUM,
SSE,
SSE2,
SSE3,
SSSE3,
SSE41,
SSE42,
AVX,
AVX2,
MAX_INTEL_MICRO_ARCHITECTURE
};
// Accessors for CPU information.
const std::string& vendor_name() const { return cpu_vendor_; }
int signature() const { return signature_; }
int stepping() const { return stepping_; }
int model() const { return model_; }
int family() const { return family_; }
int type() const { return type_; }
int extended_model() const { return ext_model_; }
int extended_family() const { return ext_family_; }
bool has_mmx() const { return has_mmx_; }
bool has_sse() const { return has_sse_; }
bool has_sse2() const { return has_sse2_; }
bool has_sse3() const { return has_sse3_; }
bool has_ssse3() const { return has_ssse3_; }
bool has_sse41() const { return has_sse41_; }
bool has_sse42() const { return has_sse42_; }
bool has_popcnt() const { return has_popcnt_; }
bool has_avx() const { return has_avx_; }
bool has_avx2() const { return has_avx2_; }
bool has_aesni() const { return has_aesni_; }
bool has_non_stop_time_stamp_counter() const {
return has_non_stop_time_stamp_counter_;
}
bool is_running_in_vm() const { return is_running_in_vm_; }
IntelMicroArchitecture GetIntelMicroArchitecture() const;
const std::string& cpu_brand() const { return cpu_brand_; }
#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID) || \
defined(OS_AIX)
enum class CoreType {
kUnknown = 0,
kOther,
kSymmetric,
kBigLittle_Little,
kBigLittle_Big,
kBigLittleBigger_Little,
kBigLittleBigger_Big,
kBigLittleBigger_Bigger,
kMaxValue = kBigLittleBigger_Bigger
};
// Attempts to guess the core types of individual CPU cores based on frequency
// information from /sys/devices/system/cpu/cpuN/cpufreq/cpuinfo_max_freq.
// Beware that it is kernel/hardware dependent whether the information from
// sys is accurate. Returns a reference to a static-storage vector (leaked on
// shutdown) with the guessed type for core N at index N.
static const std::vector<CoreType>& GetGuessedCoreTypes();
struct TimeInStateEntry {
CPU::CoreType core_type; // type of the cores in this cluster.
uint32_t cluster_core_index; // index of the first core in the cluster.
uint64_t core_frequency_khz;
TimeDelta cumulative_time;
};
using TimeInState = std::vector<TimeInStateEntry>;
// For each CPU core, emits the cumulative time spent in different frequency
// states into the output parameter (replacing its current contents). One
// entry in the output parameter is added for each cluster core index
// + frequency state combination with a non-zero CPU time value. Returns false
// on failure. We return the usage via an output parameter to allow reuse of
// TimeInState's std::vector by the caller, e.g. to avoid allocations between
// repeated calls to this method.
//
// NOTE: Currently only supported on Linux/Android, and only on kernels with
// cpufreq-stats driver.
static bool GetTimeInState(TimeInState&);
// For each CPU core, emits the total cumulative wall time spent in any idle
// state into the output parameter (replacing its current contents). Returns
// false on failure. We return the usage via an output parameter to allow
// reuse of TimeInState's std::vector by the caller, e.g. to avoid allocations
// between repeated calls to this method.
//
// NOTE: Currently only supported on Linux/Android, and only on kernels with
// cpuidle driver.
using CoreIdleTimes = std::vector<TimeDelta>;
static bool GetCumulativeCoreIdleTimes(CoreIdleTimes&);
#endif // defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID) ||
// defined(OS_AIX)
private:
// Query the processor for CPUID information.
void Initialize();
int signature_; // raw form of type, family, model, and stepping
int type_; // process type
int family_; // family of the processor
int model_; // model of processor
int stepping_; // processor revision number
int ext_model_;
int ext_family_;
bool has_mmx_;
bool has_sse_;
bool has_sse2_;
bool has_sse3_;
bool has_ssse3_;
bool has_sse41_;
bool has_sse42_;
bool has_popcnt_;
bool has_avx_;
bool has_avx2_;
bool has_aesni_;
bool has_non_stop_time_stamp_counter_;
bool is_running_in_vm_;
std::string cpu_vendor_;
std::string cpu_brand_;
};
} // namespace base
#endif // BASE_CPU_H_
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