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/**
* Runtime CPU detection
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/cpuid.h>
#include <botan/types.h>
#include <botan/loadstor.h>
#include <botan/mem_ops.h>
#if defined(BOTAN_TARGET_ARCH_IS_IA32) || defined(BOTAN_TARGET_ARCH_IS_AMD64)
#if defined(BOTAN_BUILD_COMPILER_IS_MSVC)
#include <intrin.h>
#define CALL_CPUID(type, out) do { __cpuid((int*)out, type); } while(0)
#elif defined(BOTAN_BUILD_COMPILER_IS_ICC)
#include <ia32intrin.h>
#define CALL_CPUID(type, out) do { __cpuid(out, type) } while(0);
#elif defined(BOTAN_BUILD_COMPILER_IS_GCC)
#include <cpuid.h>
#define CALL_CPUID(type, out) \
do { __get_cpuid(type, out, out+1, out+2, out+3); } while(0);
#endif
#endif
#ifndef CALL_CPUID
// In all other cases, just zeroize the supposed cpuid output
#define CALL_CPUID(type, out) \
do { out[0] = out[1] = out[2] = out[3] = 0; } while(0);
#endif
namespace Botan {
namespace {
u32bit get_x86_cache_line_size()
{
const u32bit INTEL_CPUID[3] = { 0x756E6547, 0x6C65746E, 0x49656E69 };
const u32bit AMD_CPUID[3] = { 0x68747541, 0x444D4163, 0x69746E65 };
u32bit cpuid[4] = { 0 };
CALL_CPUID(0, cpuid);
if(same_mem(cpuid + 1, INTEL_CPUID, 3))
{
CALL_CPUID(1, cpuid);
return 8 * get_byte(2, cpuid[1]);
}
else if(same_mem(cpuid + 1, AMD_CPUID, 3))
{
CALL_CPUID(0x80000005, cpuid);
return get_byte(3, cpuid[2]);
}
else
return 32; // default cache line guess
}
}
/*
* Call the x86 CPUID instruction and return the contents of ecx and
* edx, which contain the feature masks.
*/
u64bit CPUID::x86_processor_flags()
{
static u64bit proc_flags = 0;
if(proc_flags)
return proc_flags;
u32bit cpuid[4] = { 0 };
CALL_CPUID(1, cpuid);
// Set the FPU bit on to force caching in proc_flags
proc_flags = ((u64bit)cpuid[2] << 32) | cpuid[3] | 1;
return proc_flags;
}
u32bit CPUID::cache_line_size()
{
static u32bit cl_size = 0;
if(cl_size)
return cl_size;
cl_size = get_x86_cache_line_size();
return cl_size;
}
}
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