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/*
* Runtime CPU detection
* (C) 2009-2010,2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_CPUID_H__
#define BOTAN_CPUID_H__
#include <botan/types.h>
namespace Botan {
/**
* A class handling runtime CPU feature detection
*/
class BOTAN_DLL CPUID
{
public:
/**
* Probe the CPU and see what extensions are supported
*/
static void initialize();
/**
* Return a best guess of the cache line size
*/
static size_t cache_line_size() { return m_cache_line_size; }
/**
* Check if the processor supports RDTSC
*/
static bool has_rdtsc()
{ return x86_processor_flags_has(CPUID_RDTSC_BIT); }
/**
* Check if the processor supports SSE2
*/
static bool has_sse2()
{ return x86_processor_flags_has(CPUID_SSE2_BIT); }
/**
* Check if the processor supports SSSE3
*/
static bool has_ssse3()
{ return x86_processor_flags_has(CPUID_SSSE3_BIT); }
/**
* Check if the processor supports SSE4.1
*/
static bool has_sse41()
{ return x86_processor_flags_has(CPUID_SSE41_BIT); }
/**
* Check if the processor supports SSE4.2
*/
static bool has_sse42()
{ return x86_processor_flags_has(CPUID_SSE42_BIT); }
/**
* Check if the processor supports AVX2
*/
static bool has_avx2()
{ return x86_processor_flags_has(CPUID_AVX2_BIT); }
/**
* Check if the processor supports BMI2
*/
static bool has_bmi2()
{ return x86_processor_flags_has(CPUID_BMI2_BIT); }
/**
* Check if the processor supports AES-NI
*/
static bool has_aes_ni()
{ return x86_processor_flags_has(CPUID_AESNI_BIT); }
/**
* Check if the processor supports PCMULUDQ
*/
static bool has_pcmuludq()
{ return x86_processor_flags_has(CPUID_PCMUL_BIT); }
/**
* Check if the processor supports Intel SHA extension
*/
static bool has_intel_sha()
{ return x86_processor_flags_has(CPUID_SHA_BIT); }
/**
* Check if the processor supports ADX extension
*/
static bool has_adx()
{ return x86_processor_flags_has(CPUID_ADX_BIT); }
/**
* Check if the processor supports RDRAND
*/
static bool has_rdrand()
{ return x86_processor_flags_has(CPUID_RDRAND_BIT); }
/**
* Check if the processor supports RDSEED
*/
static bool has_rdseed()
{ return x86_processor_flags_has(CPUID_RDSEED_BIT); }
/**
* Check if the processor supports AltiVec/VMX
*/
static bool has_altivec() { return m_altivec_capable; }
private:
enum CPUID_bits {
CPUID_RDTSC_BIT = 4,
CPUID_SSE2_BIT = 26,
CPUID_PCMUL_BIT = 33,
CPUID_SSSE3_BIT = 41,
CPUID_SSE41_BIT = 51,
CPUID_SSE42_BIT = 52,
CPUID_AESNI_BIT = 57,
CPUID_RDRAND_BIT = 62,
CPUID_AVX2_BIT = 64+5,
CPUID_BMI2_BIT = 64+8,
CPUID_RDSEED_BIT = 64+18,
CPUID_ADX_BIT = 64+19,
CPUID_SHA_BIT = 64+29,
};
static bool x86_processor_flags_has(u64bit bit)
{
return ((m_x86_processor_flags[bit/64] >> (bit % 64)) & 1);
}
static u64bit m_x86_processor_flags[2];
static size_t m_cache_line_size;
static bool m_altivec_capable;
};
}
#endif
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