Botan::CPUID Class Reference

#include <cpuid.h>

Static Public Member Functions
static size_t	cache_line_size ()
static bool	has_aes_ni ()
static bool	has_altivec ()
static bool	has_avx ()
static bool	has_movbe ()
static bool	has_pcmuludq ()
static bool	has_rdrand ()
static bool	has_rdtsc ()
static bool	has_sse2 ()
static bool	has_sse41 ()
static bool	has_sse42 ()
static bool	has_ssse3 ()
static void	initialize ()

Detailed Description

A class handling runtime CPU feature detection

Definition at line 18 of file cpuid.h.

Member Function Documentation

cache_line_size()

size_t Botan::CPUID::cache_line_size ( )

inlinestatic

Return a best guess of the cache line size

Definition at line 29 of file cpuid.h.

{ return cache_line; }

Referenced by Botan::prefetch_readonly(), and Botan::prefetch_readwrite().

has_aes_ni()

bool Botan::CPUID::has_aes_ni ( )

inlinestatic

Check if the processor supports AES-NI

Definition at line 70 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_AESNI_BIT); }

Referenced by Botan::AES_ISA_Engine::find_block_cipher().

has_altivec()

bool Botan::CPUID::has_altivec ( )

inlinestatic

Check if the processor supports AltiVec/VMX

Definition at line 94 of file cpuid.h.

{ return altivec_capable; }

has_avx()

bool Botan::CPUID::has_avx ( )

inlinestatic

Check if the processor supports extended AVX vector instructions

Definition at line 64 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_AVX_BIT); }

has_movbe()

bool Botan::CPUID::has_movbe ( )

inlinestatic

Check if the processor supports MOVBE

Definition at line 82 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_MOVBE_BIT); }

has_pcmuludq()

bool Botan::CPUID::has_pcmuludq ( )

inlinestatic

Check if the processor supports PCMULUDQ

Definition at line 76 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_PCMUL_BIT); }

has_rdrand()

bool Botan::CPUID::has_rdrand ( )

inlinestatic

Check if the processor supports RDRAND

Definition at line 88 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_RDRAND_BIT); }

Referenced by Botan::Intel_Rdrand::poll().

has_rdtsc()

bool Botan::CPUID::has_rdtsc ( )

inlinestatic

Check if the processor supports RDTSC

Definition at line 34 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_RDTSC_BIT); }

Referenced by Botan::High_Resolution_Timestamp::poll().

has_sse2()

bool Botan::CPUID::has_sse2 ( )

inlinestatic

Check if the processor supports SSE2

Definition at line 40 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_SSE2_BIT); }

Referenced by Botan::SIMD_Engine::find_block_cipher(), and Botan::SIMD_Engine::find_hash().

has_sse41()

bool Botan::CPUID::has_sse41 ( )

inlinestatic

Check if the processor supports SSE4.1

Definition at line 52 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_SSE41_BIT); }

has_sse42()

bool Botan::CPUID::has_sse42 ( )

inlinestatic

Check if the processor supports SSE4.2

Definition at line 58 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_SSE42_BIT); }

has_ssse3()

bool Botan::CPUID::has_ssse3 ( )

inlinestatic

Check if the processor supports SSSE3

Definition at line 46 of file cpuid.h.

         { return x86_processor_flags_has(CPUID_SSSE3_BIT); }

Referenced by Botan::SIMD_Engine::find_block_cipher().

initialize()

void Botan::CPUID::initialize ( )

static

Probe the CPU and see what extensions are supported

Definition at line 196 of file cpuid.cpp.

   {
   u32bit cpuid[4] = { 0 };
   CALL_CPUID(1, cpuid);
 
   x86_processor_flags = (static_cast<u64bit>(cpuid[2]) << 32) | cpuid[3];
 
#if defined(BOTAN_TARGET_ARCH_IS_X86_64)
   /*
   * If we don't have access to CPUID, we can still safely assume that
   * any x86-64 processor has SSE2.
   */
   if(x86_processor_flags == 0)
     x86_processor_flags |= (1 << CPUID_SSE2_BIT);
#endif
 
   cache_line = get_x86_cache_line_size();
 
   altivec_capable = false;
 
#if defined(BOTAN_TARGET_CPU_IS_PPC_FAMILY)
      if(altivec_check_sysctl() || altivec_check_pvr_emul())
         altivec_capable = true;
#endif
   }

References CALL_CPUID.

Referenced by Botan::Library_State::initialize().

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The documentation for this class was generated from the following files:

• src/utils/cpuid.h
• src/utils/cpuid.cpp