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@macton macton/cpuid_features.c
Last active Aug 20, 2019

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Print cpuid features
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cpuid_features.c
// See: Intel Intrinsics Guide https://software.intel.com/sites/landingpage/IntrinsicsGuide/
// See: CPUID Explorer http://www.flounder.com/cpuid_explorer1.htm
// See: Playing with cpuid http://newbiz.github.io/cpp/2010/12/20/Playing-with-cpuid.html
// See: MSDN __cpuid, __cpuidex http://msdn.microsoft.com/en-us/library/hskdteyh.aspx
// See: Notes on MMX/SSE and a searchable table of intrinsics. http://www.taffysoft.com/pages/20120418-01.html
// See: AMD CPUID Specification http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2012/10/25481.pdf
#if defined(__GNUC__)
#include <stdint.h>
#include <cpuid.h>
#elif defined(_WIN32)
#include <intrin.h>
typedef unsigned __int32 uint32_t;
#endif
#include <stdio.h>
#include <string.h>
void
cpuid( uint32_t op, uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx )
{
#if defined(__GNUC__)
__get_cpuid (op,eax,ebx,ecx,edx);
#elif defined(_WIN32)
// MSVC provides a __cpuid function
int regs[4];
__cpuid( regs, op );
*eax = (uint32_t)regs[0];
*ebx = (uint32_t)regs[1];
*ecx = (uint32_t)regs[2];
*edx = (uint32_t)regs[3];
#endif
}
typedef union EBChar4
{
uint32_t u32;
char c[4];
}
EBChar4;
void
print_feature( uint32_t test, const char* name )
{
printf("%s - %s\n", (test)?"YES":"NO ", name );
}
void
print_ebchar4( uint32_t a )
{
EBChar4 a_c;
a_c.u32 = a;
printf("%c%c%c%c",a_c.c[0],a_c.c[1],a_c.c[2],a_c.c[3]);
}
int
main( void )
{
uint32_t eax;
uint32_t ebx;
uint32_t ecx;
uint32_t edx;
cpuid( 0, &eax, &ebx, &ecx, &edx );
uint32_t ids = eax;
cpuid( 0x80000000, &eax, &ebx, &ecx, &edx );
uint32_t ex_ids = eax;
{
// On AMD, 0x80000000 also returns Vendor ID; On Intel 0x80000000 is empty.
cpuid( 0x00000000, &eax, &ebx, &ecx, &edx );
printf("Vendor = ");
print_ebchar4( ebx );
print_ebchar4( edx );
print_ebchar4( ecx );
printf("\n");
}
if ( ex_ids >= 0x80000004 )
{
printf("Processor = ");
cpuid( 0x80000002, &eax, &ebx, &ecx, &edx );
print_ebchar4( eax );
print_ebchar4( ebx );
print_ebchar4( ecx );
print_ebchar4( edx );
cpuid( 0x80000003, &eax, &ebx, &ecx, &edx );
print_ebchar4( eax );
print_ebchar4( ebx );
print_ebchar4( ecx );
print_ebchar4( edx );
cpuid( 0x80000004, &eax, &ebx, &ecx, &edx );
print_ebchar4( eax );
print_ebchar4( ebx );
print_ebchar4( ecx );
print_ebchar4( edx );
printf("\n");
}
printf("\n");
if ( ids >= 1 )
{
cpuid( 1, &eax, &ebx, &ecx, &edx );
print_feature( edx & (1<< 0), "FPU (Floating-point Unit on-chip)");
print_feature( edx & (1<< 1), "VME (Virtual Mode Extension)");
print_feature( edx & (1<< 2), "DE (Debugging Extension)");
print_feature( edx & (1<< 3), "PSE (Page Size Extension)");
print_feature( edx & (1<< 4), "TSC (Time Stamp Counter)");
print_feature( edx & (1<< 5), "MSR (Model Specific Registers)");
print_feature( edx & (1<< 6), "PAE (Physical Address Extension)");
print_feature( edx & (1<< 7), "MCE (Machine Check Exception)");
print_feature( edx & (1<< 8), "CX8 (CMPXCHG8 Instructions)");
print_feature( edx & (1<< 9), "APIC (On-chip APIC hardware)");
print_feature( edx & (1<<11), "SEP (Fast System Call)");
print_feature( edx & (1<<12), "MTRR (Memory type Range Registers)");
print_feature( edx & (1<<13), "PGE (Page Global Enable)");
print_feature( edx & (1<<14), "MCA (Machine Check Architecture)");
print_feature( edx & (1<<15), "CMOV (Conditional Move Instruction)");
print_feature( edx & (1<<16), "PAT (Page Attribute Table)");
print_feature( edx & (1<<17), "PSE36 (36bit Page Size Extension");
print_feature( edx & (1<<18), "PSN (Processor Serial Number)");
print_feature( edx & (1<<19), "CLFSH (CFLUSH Instruction)");
print_feature( edx & (1<<21), "DS (Debug Store)");
print_feature( edx & (1<<22), "ACPI (Thermal Monitor & Software Controlled Clock)");
print_feature( edx & (1<<23), "MMX (Multi-Media Extension)");
print_feature( edx & (1<<24), "FXSR (Fast Floating Point Save & Restore)");
print_feature( edx & (1<<25), "SSE (Streaming SIMD Extension 1)");
print_feature( edx & (1<<26), "SSE2 (Streaming SIMD Extension 2)");
print_feature( edx & (1<<27), "SS (Self Snoop)");
print_feature( edx & (1<<28), "HTT (Hyper Threading Technology)");
print_feature( edx & (1<<29), "TM (Thermal Monitor)");
print_feature( edx & (1<<31), "PBE (Pend Break Enabled)");
print_feature( ecx & (1<< 0), "SSE3 (Streaming SMD Extension 3)");
print_feature( ecx & (1<< 3), "MW (Monitor Wait Instruction");
print_feature( ecx & (1<< 4), "CPL (CPL-qualified Debug Store)");
print_feature( ecx & (1<< 5), "VMX (Virtual Machine Extensions)");
print_feature( ecx & (1<< 7), "EST (Enchanced Speed Test)");
print_feature( ecx & (1<< 8), "TM2 (Thermal Monitor 2)");
print_feature( ecx & (1<< 9), "SSSE3 (Supplemental Streaming SIMD Extensions 3)");
print_feature( ecx & (1<<10), "L1 (L1 Context ID)");
print_feature( ecx & (1<<12), "FMA3 (Fused Multiply-Add 3-operand Form)");
print_feature( ecx & (1<<13), "CAE (Compare And Exchange 16B)");
print_feature( ecx & (1<<19), "SSE41 (Streaming SIMD Extensions 4.1)");
print_feature( ecx & (1<<20), "SSE42 (Streaming SIMD Extensions 4.2)");
print_feature( ecx & (1<<23), "POPCNT (Advanced Bit Manipulation - Bit Population Count Instruction)");
print_feature( ecx & (1<<25), "AES (Advanced Encryption Standard)");
print_feature( ecx & (1<<28), "AVX (Advanced Vector Extensions)");
print_feature( ecx & (1<<30), "RDRAND (Random Number Generator)");
}
if ( ids >= 7 )
{
cpuid( 7, &eax, &ebx, &ecx, &edx );
print_feature( ebx & (1<< 5), "AVX2 (Advanced Vector Extensions 2)");
print_feature( ebx & (1<< 3), "BMI1 (Bit Manipulations Instruction Set 1)");
print_feature( ebx & (1<< 8), "BMI2 (Bit Manipulations Instruction Set 2)");
print_feature( ebx & (1<<19), "ADX (Multi-Precision Add-Carry Instruction Extensions)");
print_feature( ebx & (1<<16), "AVX512F (512-bit extensions to Advanced Vector Extensions Foundation)");
print_feature( ebx & (1<<26), "AVX512PFI (512-bit extensions to Advanced Vector Extensions Prefetch Instructions)");
print_feature( ebx & (1<<27), "AVX512ERI (512-bit extensions to Advanced Vector Extensions Exponential and Reciprocal Instructions)");
print_feature( ebx & (1<<28), "AVX512CDI (512-bit extensions to Advanced Vector Extensions Conflict Detection Instructions)");
print_feature( ebx & (1<<29), "SHA (Secure Hash Algorithm)");
}
if ( ex_ids >= 0x80000001 )
{
cpuid( 0x80000001, &eax, &ebx, &ecx, &edx );
print_feature( edx & (1<<29), "X64 (64-bit Extensions/Long mode)");
print_feature( ecx & (1<< 5), "LZCNT (Advanced Bit Manipulation - Leading Zero Bit Count Instruction)");
print_feature( ecx & (1<< 6), "SSE4A (Streaming SIMD Extensions 4a)");
print_feature( ecx & (1<<16), "FMA4 (Fused Multiply-Add 4-operand Form)");
print_feature( ecx & (1<<11), "XOP (Extended Operations)");
print_feature( ecx & (1<<21), "TBM (Trailing Bit Manipulation Instruction)");
print_feature( ecx & (1<<15), "LWP (Light Weight Profiling Support)");
print_feature( ecx & (1<<13), "WDT (Watchdog Timer Support)");
print_feature( ecx & (1<<10), "IBS (Instruction Based Sampling)");
print_feature( ecx & (1<< 8), "3DNOWPREFETCH (PREFETCH and PREFETCHW instruction support)");
print_feature( ecx & (1<< 7), "MISALIGNSSE (Misaligned SSE mode)");
print_feature( ecx & (1<< 2), "SVM (Secure Virtual Machine)");
print_feature( ecx & (1<< 0), "LAHFSAHF (LAHF and SAHF instruction support in 64-bit mode)");
}
return 0;
}
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