cpuid, cpuidex

Article
02/01/2013

Microsoft Specific

Generates the cpuid instruction that is available on x86 and x64. This instruction queries the processor for information about the supported features and CPU type.

void __cpuid(
   int CPUInfo[4],
   int InfoType
);

void __cpuidex(
   int CPUInfo[4],
   int InfoType,
   int ECXValue
);

Parameters

[out] CPUInfo
An array of four integers that contains the gathered information about supported features and the CPU.
[in] InfoType
A code that indicates what information this instruction retrieves.
[in] ECXValue
The value of the ECX register before this intrinsic generates the cpuid instruction.

Requirements

Intrinsic	Architecture
__cpuid	x86, x64
__cpuidex	x86, x64

Header file <intrin.h>

Remarks

This instruction stores the supported features and CPU information in CPUInfo, an array of four 32-bit integers that is filled with the values of the EAX, EBX, ECX, and EDX registers (in that order) after you call the cpuid instruction. The information has a different meaning depending on the value passed as the InfoType parameter. The information returned with various values of InfoType is processor-dependent.

The __cpuidex intrinsic sets the value of the ECX register before it generates the cpuid instruction. This enables you to gather additional information about the processor.

When the InfoType argument is 0, the following table describes the output.

Information Returned

Array index	Bit range	Description
0	0-31	Maximum value for the InfoType parameter that will return valid information.
1	0-31	Identification string (part 1)
2	0-31	Identification string (part 3)
3	0-31	Identification string (part 2)

When the InfoType argument is 1, the following table describes the output.

CPU Information Returned

Array index	Bit range	Description
0	0-3	Stepping ID
0	4-7	Model
0	8-11	Family
0	12-13	Processor type (Intel) Reserved (AMD)
0	14-15	Reserved
0	16-19	Extended model
0	20-27	Extended family
0	28-31	Reserved
1	0-7	Brand index
1	8-15	The size of the CLFLUSH cache line, in quadwords
1	16-23	Logical processor count
1	24-31	Initial APIC ID
2	0	SSE3 new instructions
2	1-2	Reserved
2	3	MONITOR/MWAIT
2	4	CPL Qualified Debug Store (Intel) Reserved (AMD)
2	5	Virtual machine extensions (Intel) Reserved (AMD)
2	6	Safer mode extensions (Intel) Reserved (AMD)
2	7	Enhanced Intel SpeedStep technology (Intel) Reserved (AMD)
2	8	Thermal Monitor (Intel) Reserved (AMD)2
2	9	Supplemental Streaming SIMD Extensions 3 (SSSE3)
2	10	L1 context ID (Intel) Reserved (AMD)
2	11	Reserved
2	12	256-bit FMA extensions (Intel) Reserved (AMD)
2	13	CMPXCHG16B support
2	14	xTPR update control
2	15	Perf/Debug capability MSR
2	16-17	Reserved
2	18	Direct cache access (DCA) support (Intel) Reserved (AMD)
2	19	SSE4.1 extensions
2	20	SSE4.2 extensions
2	21	x2APIC support (Intel) Reserved (AMD)
2	22	MOVBE support (Intel) Reserved (AMD)
2	23	POPCNT instruction support
2	24	Reserved
2	25	AES support (Intel) Reserved (AMD)
2	26	XSAVE support (Intel) Reserved (AMD)
2	27	OSXSAVE support (Intel) Reserved (AMD)
2	28	256-bit Intel advanced vector extensions (Intel) Reserved (AMD)
2	29-31	Reserved
3	0-31	Feature information (see later in the topic)

The following table shows the meaning of the feature information value, the value of EDX which is written to CPUInfo[3], when the InfoType argument is 1.

Feature Information Returned

Bit	Mnemonic	Description
0	FPU	x87 FPU on chip
1	VME	Virtual-8086 mode enhancement
2	DE	Debugging extensions
3	PSE	Page size extensions
4	TSC	Time stamp counter
5	MSR	RDMSR and WRMSR support
6	PAE	Physical address extensions
7	MCE	Machine check exception
8	CX8	CMPXCHG8B instruction
9	APIC	APIC on chip
10	n/a	Reserved
11	SEP	SYSENTER and SYSEXIT
12	MTRR	Memory type range registers
13	PGE	PTE global bit
14	MCA	Machine check architecture
15	CMOV	Conditional move/compare instruction
16	PAT	Page Attribute Table
17	PSE-36	36-bit page size extension
18	PSN	Processor serial number
19	CLFSH	CFLUSH instruction
20	n/a	Reserved
21	DS	Debug store
22	ACPI	Thermal monitor and clock control
23	MMX	MMX technology
24	FXSR	FXSAVE/FXRSTOR
25	SSE	SSE extensions
26	SSE2	SSE2 extensions
27	SS	Self snoop
28	HTT	Multithreading
29	TM	Thermal monitor
30	n/a	Reserved
31	PBE	Pending break enable

Note

With the AMD chipset, all multi-core AMD CPUs set bit 28 of the feature information bits to indicate that the chip has more than one core. This is the case even though AMD does not support hyper-threading.

Some processors, such as the SSE3 and SSE4-enabled processors, support additional InfoType values. When the InfoType argument is 2, this instruction returns cache information in encoded forms.

The following table shows the values this instruction returns when you set InfoType to 4. This is cache information is related to one of the cache levels. To retrieve this information, you must set the ECX register. Use the __cpuidex intrinsic to set ECX to the zero-based index for the cache level to query.

Deterministic Cache Information

Array Index	Bit Range	Description
0	0-4	Cache type field
0	5-7	Cache level
0	8	Self-initializing cache
0	9	Fully associative cache
0	10-13	Reserved
0	14-25	Maximum number of threads
0	26-31	Maximum number of IDs for processor cores
1	0-11	System coherency line size
1	12-21	Physical line partitions
1	22-31	Ways of associativity
2	0-31	Number of sets
3	0-31	Reserved

When InfoType is 5, these processors return information about the monitor feature (see _mm_monitor).

When InfoType is 6, processors return information about the digital temperature and power management.

When InfoType is 0x0A, these processers return information obtained by monitoring the architectural performance.

Some processors support Extended Function CPUID information. If this is supported, InfoType values from 0x80000000 might be used to return information. To determine the maximum meaningful value allowed, set InfoType to 0x80000000. The maximum value of InfoType supported will be written to CPUInfo[0]. The following table shows values returned using the extended function CPUID information.

Extended Function CPUID Information

InfoType	Array index	Bit range	Information
0x80000000	0	0-31	Maximum meaningful value of InfoType for extended function CPUID information.
0x80000000	1-3	0-31	Reserved.
0x80000001	0	0-31	Extended processor signature and extended feature bits
0x80000001	1	0-31	Reserved
0x80000001	2	0	LAHF/SAHF available in 64-bit mode
0x80000001	2	1	Core multi-processing legacy mode (CmpLegacy) (AMD) Reserved (Intel)
0x80000001	2	2	Secure virtual machine (SVM) (AMD) Reserved (Intel)
0x80000001	2	3	Extended APIC Register Space (ExtApicSpace) (AMD) Reserved (Intel)
0x80000001	2	4	AltMovCr8 (AMD) Reserved (Intel)
0x80000001	2	5	LZCNT Support (AMD) Reserved (Intel)
0x80000001	2	6	SSE4A instruction support (EXTRQ, INSERTQ, MOVNTSD, MOVNTSS) (AMD) Reserved (Intel)
0x80000001	2	7	Misaligned SSE support mode available (AMD) Reserved (Intel)
0x80000001	2	8	PREFETCH and PREFETCHW support (AMD) Reserved (Intel)
0x80000001	2	9-11	Reserved
0x80000001	2	12	SKINIT and DEV support (AMD) Reserved (Intel)
0x80000001	2	13-31	Reserved
0x80000001	3	0-10	Reserved
0x80000001	3	11	SYSCALL/SYSRET available in 64-bit mode
0x80000001	3	12-19	Reserved
0x80000001	3	20	Execute disable bit available
0x80000001	3	21	Reserved
0x80000001	3	22	Extensions to MMX instructions (AMD) Reserved (Intel)
0x80000001	3	23-24	Reserved
0x80000001	3	25	FFXSR (AMD) Reserved (Intel)
0x80000001	3	26	1GB page support (AMD) Reserved (Intel)
0x80000001	3	27	RDTSCP support (AMD) Reserved (Intel)
0x80000001	3	28	Reserved
0x80000001	3	29	64-bit technology available
0x80000001	3	30	3DnowExt (AMD) Reserved (Intel)
0x80000001	3	31	3Dnow! instructions (AMD) Reserved (Intel)
0x80000002	0-3	0-31	Processor brand string
0x80000003	0-3	0-31	Processor brand string, continued
0x80000004	0-3	0-31	Processor brand string, continued
0x80000005	0-3	0-31	L1 cache and TLB identifiers (AMD) Reserved (Intel)
0x80000006	0-1	0-31	Reserved
0x80000006	2	0-7	Cache line size
0x80000006	2	8-11	Reserved
0x80000006	2	12-15	L2 associativity
0x80000006	2	16-31	Cache size in 1K units
0x80000006	3	0-31	Reserved
0x80000007	0-3	0-31	Advanced power management information (AMD) Reserved (Intel)
0x80000008	0	0-7	Physical address bits
0x80000008	0	8-15	Virtual address bits
0x80000008	0	16-31	Reserved
0x80000008	1-3	0-31	Reserved
0x8000000A	0	0-7	SVM revision (AMD) Reserved (Intel)
0x8000000A	0	8-31	Reserved
0x8000000A	1	0-31	NASID - Number of Address Space Identifiers (AMD) Reserved (Intel)
0x8000000A	2	0-31	Reserved
0x8000000A	3	0	Nested paging (AMD) Reserved (Intel)
0x8000000A	3	1	LBR visualization (AMD) Reserved (Intel)
0x8000000A	3	2-31	Reserved
0x80000019	0-3	0-31	TLB 1GB page identifiers (AMD) Reserved (Intel)
0x8000001A	0	0	FP128 optimization (AMD) Reserved (Intel)
0x8000001A	0	1	MOVU, MOVUPS, MOVUPD optimization over MOVL/MOVH, MOVHLPS/MOVHPS, MOVLPD/MOVHPD (AMD) Reserved (Intel)
0x8000001A	0	2-31	Reserved
0x8000001A	1-3	0-31	Reserved

Example

// cpuid.cpp 
// processor: x86, x64
// Use the __cpuid intrinsic to get information about a CPU

#include <stdio.h>
#include <string.h>
#include <intrin.h>

const char* szFeatures[] =
{
    "x87 FPU On Chip",
    "Virtual-8086 Mode Enhancement",
    "Debugging Extensions",
    "Page Size Extensions",
    "Time Stamp Counter",
    "RDMSR and WRMSR Support",
    "Physical Address Extensions",
    "Machine Check Exception",
    "CMPXCHG8B Instruction",
    "APIC On Chip",
    "Unknown1",
    "SYSENTER and SYSEXIT",
    "Memory Type Range Registers",
    "PTE Global Bit",
    "Machine Check Architecture",
    "Conditional Move/Compare Instruction",
    "Page Attribute Table",
    "36-bit Page Size Extension",
    "Processor Serial Number",
    "CFLUSH Extension",
    "Unknown2",
    "Debug Store",
    "Thermal Monitor and Clock Ctrl",
    "MMX Technology",
    "FXSAVE/FXRSTOR",
    "SSE Extensions",
    "SSE2 Extensions",
    "Self Snoop",
    "Multithreading Technology",
    "Thermal Monitor",
    "Unknown4",
    "Pending Break Enable"
};

int main(int argc, char* argv[])
{
    char CPUString[0x20];
    char CPUBrandString[0x40];
    int CPUInfo[4] = {-1};
    int nSteppingID = 0;
    int nModel = 0;
    int nFamily = 0;
    int nProcessorType = 0;
    int nExtendedmodel = 0;
    int nExtendedfamily = 0;
    int nBrandIndex = 0;
    int nCLFLUSHcachelinesize = 0;
    int nLogicalProcessors = 0;
    int nAPICPhysicalID = 0;
    int nFeatureInfo = 0;
    int nCacheLineSize = 0;
    int nL2Associativity = 0;
    int nCacheSizeK = 0;
    int nPhysicalAddress = 0;
    int nVirtualAddress = 0;
    int nRet = 0;

    int nCores = 0;
    int nCacheType = 0;
    int nCacheLevel = 0;
    int nMaxThread = 0;
    int nSysLineSize = 0;
    int nPhysicalLinePartitions = 0;
    int nWaysAssociativity = 0;
    int nNumberSets = 0;

    unsigned    nIds, nExIds, i;

    bool    bSSE3Instructions = false;
    bool    bMONITOR_MWAIT = false;
    bool    bCPLQualifiedDebugStore = false;
    bool    bVirtualMachineExtensions = false;
    bool    bEnhancedIntelSpeedStepTechnology = false;
    bool    bThermalMonitor2 = false;
    bool    bSupplementalSSE3 = false;
    bool    bL1ContextID = false;
    bool    bCMPXCHG16B = false;
    bool    bxTPRUpdateControl = false;
    bool    bPerfDebugCapabilityMSR = false;
    bool    bSSE41Extensions = false;
    bool    bSSE42Extensions = false;
    bool    bPOPCNT = false;

    bool    bMultithreading = false;

    bool    bLAHF_SAHFAvailable = false;
    bool    bCmpLegacy = false;
    bool    bSVM = false;
    bool    bExtApicSpace = false;
    bool    bAltMovCr8 = false;
    bool    bLZCNT = false;
    bool    bSSE4A = false;
    bool    bMisalignedSSE = false;
    bool    bPREFETCH = false;
    bool    bSKINITandDEV = false;
    bool    bSYSCALL_SYSRETAvailable = false;
    bool    bExecuteDisableBitAvailable = false;
    bool    bMMXExtensions = false;
    bool    bFFXSR = false;
    bool    b1GBSupport = false;
    bool    bRDTSCP = false;
    bool    b64Available = false;
    bool    b3DNowExt = false;
    bool    b3DNow = false;
    bool    bNestedPaging = false;
    bool    bLBRVisualization = false;
    bool    bFP128 = false;
    bool    bMOVOptimization = false;

    bool    bSelfInit = false;
    bool    bFullyAssociative = false;

    // __cpuid with an InfoType argument of 0 returns the number of
    // valid Ids in CPUInfo[0] and the CPU identification string in
    // the other three array elements. The CPU identification string is
    // not in linear order. The code below arranges the information 
    // in a human readable form.
    __cpuid(CPUInfo, 0);
    nIds = CPUInfo[0];
    memset(CPUString, 0, sizeof(CPUString));
    *((int*)CPUString) = CPUInfo[1];
    *((int*)(CPUString+4)) = CPUInfo[3];
    *((int*)(CPUString+8)) = CPUInfo[2];

    // Get the information associated with each valid Id
    for (i=0; i<=nIds; ++i)
    {
        __cpuid(CPUInfo, i);
        printf_s("\nFor InfoType %d\n", i); 
        printf_s("CPUInfo[0] = 0x%x\n", CPUInfo[0]);
        printf_s("CPUInfo[1] = 0x%x\n", CPUInfo[1]);
        printf_s("CPUInfo[2] = 0x%x\n", CPUInfo[2]);
        printf_s("CPUInfo[3] = 0x%x\n", CPUInfo[3]);

        // Interpret CPU feature information.
        if  (i == 1)
        {
            nSteppingID = CPUInfo[0] & 0xf;
            nModel = (CPUInfo[0] >> 4) & 0xf;
            nFamily = (CPUInfo[0] >> 8) & 0xf;
            nProcessorType = (CPUInfo[0] >> 12) & 0x3;
            nExtendedmodel = (CPUInfo[0] >> 16) & 0xf;
            nExtendedfamily = (CPUInfo[0] >> 20) & 0xff;
            nBrandIndex = CPUInfo[1] & 0xff;
            nCLFLUSHcachelinesize = ((CPUInfo[1] >> 8) & 0xff) * 8;
            nLogicalProcessors = ((CPUInfo[1] >> 16) & 0xff);
            nAPICPhysicalID = (CPUInfo[1] >> 24) & 0xff;
            bSSE3Instructions = (CPUInfo[2] & 0x1) || false;
            bMONITOR_MWAIT = (CPUInfo[2] & 0x8) || false;
            bCPLQualifiedDebugStore = (CPUInfo[2] & 0x10) || false;
            bVirtualMachineExtensions = (CPUInfo[2] & 0x20) || false;
            bEnhancedIntelSpeedStepTechnology = (CPUInfo[2] & 0x80) || false;
            bThermalMonitor2 = (CPUInfo[2] & 0x100) || false;
            bSupplementalSSE3 = (CPUInfo[2] & 0x200) || false;
            bL1ContextID = (CPUInfo[2] & 0x300) || false;
            bCMPXCHG16B= (CPUInfo[2] & 0x2000) || false;
            bxTPRUpdateControl = (CPUInfo[2] & 0x4000) || false;
            bPerfDebugCapabilityMSR = (CPUInfo[2] & 0x8000) || false;
            bSSE41Extensions = (CPUInfo[2] & 0x80000) || false;
            bSSE42Extensions = (CPUInfo[2] & 0x100000) || false;
            bPOPCNT= (CPUInfo[2] & 0x800000) || false;
            nFeatureInfo = CPUInfo[3];
            bMultithreading = (nFeatureInfo & (1 << 28)) || false;
        }
    }

    // Calling __cpuid with 0x80000000 as the InfoType argument
    // gets the number of valid extended IDs.
    __cpuid(CPUInfo, 0x80000000);
    nExIds = CPUInfo[0];
    memset(CPUBrandString, 0, sizeof(CPUBrandString));

    // Get the information associated with each extended ID.
    for (i=0x80000000; i<=nExIds; ++i)
    {
        __cpuid(CPUInfo, i);
        printf_s("\nFor InfoType %x\n", i); 
        printf_s("CPUInfo[0] = 0x%x\n", CPUInfo[0]);
        printf_s("CPUInfo[1] = 0x%x\n", CPUInfo[1]);
        printf_s("CPUInfo[2] = 0x%x\n", CPUInfo[2]);
        printf_s("CPUInfo[3] = 0x%x\n", CPUInfo[3]);

        if  (i == 0x80000001)
        {
            bLAHF_SAHFAvailable = (CPUInfo[2] & 0x1) || false;
            bCmpLegacy = (CPUInfo[2] & 0x2) || false;
            bSVM = (CPUInfo[2] & 0x4) || false;
            bExtApicSpace = (CPUInfo[2] & 0x8) || false;
            bAltMovCr8 = (CPUInfo[2] & 0x10) || false;
            bLZCNT = (CPUInfo[2] & 0x20) || false;
            bSSE4A = (CPUInfo[2] & 0x40) || false;
            bMisalignedSSE = (CPUInfo[2] & 0x80) || false;
            bPREFETCH = (CPUInfo[2] & 0x100) || false;
            bSKINITandDEV = (CPUInfo[2] & 0x1000) || false;
            bSYSCALL_SYSRETAvailable = (CPUInfo[3] & 0x800) || false;
            bExecuteDisableBitAvailable = (CPUInfo[3] & 0x10000) || false;
            bMMXExtensions = (CPUInfo[3] & 0x40000) || false;
            bFFXSR = (CPUInfo[3] & 0x200000) || false;
            b1GBSupport = (CPUInfo[3] & 0x400000) || false;
            bRDTSCP = (CPUInfo[3] & 0x8000000) || false;
            b64Available = (CPUInfo[3] & 0x20000000) || false;
            b3DNowExt = (CPUInfo[3] & 0x40000000) || false;
            b3DNow = (CPUInfo[3] & 0x80000000) || false;
        }

        // Interpret CPU brand string and cache information.
        if  (i == 0x80000002)
            memcpy(CPUBrandString, CPUInfo, sizeof(CPUInfo));
        else if  (i == 0x80000003)
            memcpy(CPUBrandString + 16, CPUInfo, sizeof(CPUInfo));
        else if  (i == 0x80000004)
            memcpy(CPUBrandString + 32, CPUInfo, sizeof(CPUInfo));
        else if  (i == 0x80000006)
        {
            nCacheLineSize = CPUInfo[2] & 0xff;
            nL2Associativity = (CPUInfo[2] >> 12) & 0xf;
            nCacheSizeK = (CPUInfo[2] >> 16) & 0xffff;
        }
        else if  (i == 0x80000008)
        {
           nPhysicalAddress = CPUInfo[0] & 0xff;
           nVirtualAddress = (CPUInfo[0] >> 8) & 0xff;
        }
        else if  (i == 0x8000000A)
        {
            bNestedPaging = (CPUInfo[3] & 0x1) || false;
            bLBRVisualization = (CPUInfo[3] & 0x2) || false;
        }
        else if  (i == 0x8000001A)
        {
            bFP128 = (CPUInfo[0] & 0x1) || false;
            bMOVOptimization = (CPUInfo[0] & 0x2) || false;
        }
    }

    // Display all the information in user-friendly format.

    printf_s("\n\nCPU String: %s\n", CPUString);

    if  (nIds >= 1)
    {
        if  (nSteppingID)
            printf_s("Stepping ID = %d\n", nSteppingID);
        if  (nModel)
            printf_s("Model = %d\n", nModel);
        if  (nFamily)
            printf_s("Family = %d\n", nFamily);
        if  (nProcessorType)
            printf_s("Processor Type = %d\n", nProcessorType);
        if  (nExtendedmodel)
            printf_s("Extended model = %d\n", nExtendedmodel);
        if  (nExtendedfamily)
            printf_s("Extended family = %d\n", nExtendedfamily);
        if  (nBrandIndex)
            printf_s("Brand Index = %d\n", nBrandIndex);
        if  (nCLFLUSHcachelinesize)
            printf_s("CLFLUSH cache line size = %d\n",
                     nCLFLUSHcachelinesize);
        if (bMultithreading && (nLogicalProcessors > 0))
           printf_s("Logical Processor Count = %d\n", nLogicalProcessors);
        if  (nAPICPhysicalID)
            printf_s("APIC Physical ID = %d\n", nAPICPhysicalID);

        if  (nFeatureInfo || bSSE3Instructions ||
             bMONITOR_MWAIT || bCPLQualifiedDebugStore ||
             bVirtualMachineExtensions || bEnhancedIntelSpeedStepTechnology ||
             bThermalMonitor2 || bSupplementalSSE3 || bL1ContextID || 
             bCMPXCHG16B || bxTPRUpdateControl || bPerfDebugCapabilityMSR || 
             bSSE41Extensions || bSSE42Extensions || bPOPCNT || 
             bLAHF_SAHFAvailable || bCmpLegacy || bSVM ||
             bExtApicSpace || bAltMovCr8 ||
             bLZCNT || bSSE4A || bMisalignedSSE ||
             bPREFETCH || bSKINITandDEV || bSYSCALL_SYSRETAvailable || 
             bExecuteDisableBitAvailable || bMMXExtensions || bFFXSR || b1GBSupport ||
             bRDTSCP || b64Available || b3DNowExt || b3DNow || bNestedPaging || 
             bLBRVisualization || bFP128 || bMOVOptimization )
        {
            printf_s("\nThe following features are supported:\n");

            if  (bSSE3Instructions)
                printf_s("\tSSE3\n");
            if  (bMONITOR_MWAIT)
                printf_s("\tMONITOR/MWAIT\n");
            if  (bCPLQualifiedDebugStore)
                printf_s("\tCPL Qualified Debug Store\n");
            if  (bVirtualMachineExtensions)
                printf_s("\tVirtual Machine Extensions\n");
            if  (bEnhancedIntelSpeedStepTechnology)
                printf_s("\tEnhanced Intel SpeedStep Technology\n");
            if  (bThermalMonitor2)
                printf_s("\tThermal Monitor 2\n");
            if  (bSupplementalSSE3)
                printf_s("\tSupplemental Streaming SIMD Extensions 3\n");
            if  (bL1ContextID)
                printf_s("\tL1 Context ID\n");
            if  (bCMPXCHG16B)
                printf_s("\tCMPXCHG16B Instruction\n");
            if  (bxTPRUpdateControl)
                printf_s("\txTPR Update Control\n");
            if  (bPerfDebugCapabilityMSR)
                printf_s("\tPerf\\Debug Capability MSR\n");
            if  (bSSE41Extensions)
                printf_s("\tSSE4.1 Extensions\n");
            if  (bSSE42Extensions)
                printf_s("\tSSE4.2 Extensions\n");
            if  (bPOPCNT)
                printf_s("\tPPOPCNT Instruction\n");

            i = 0;
            nIds = 1;
            while (i < (sizeof(szFeatures)/sizeof(const char*)))
            {
                if  (nFeatureInfo & nIds)
                {
                    printf_s("\t");
                    printf_s(szFeatures[i]);
                    printf_s("\n");
                }

                nIds <<= 1;
                ++i;
            }
            if (bLAHF_SAHFAvailable)
                printf_s("\tLAHF/SAHF in 64-bit mode\n");
            if (bCmpLegacy)
                printf_s("\tCore multi-processing legacy mode\n");
            if (bSVM)
                printf_s("\tSecure Virtual Machine\n");
            if (bExtApicSpace)
                printf_s("\tExtended APIC Register Space\n");
            if (bAltMovCr8)
                printf_s("\tAltMovCr8\n");
            if (bLZCNT)
                printf_s("\tLZCNT instruction\n");
            if (bSSE4A)
                printf_s("\tSSE4A (EXTRQ, INSERTQ, MOVNTSD, MOVNTSS)\n");
            if (bMisalignedSSE)
                printf_s("\tMisaligned SSE mode\n");
            if (bPREFETCH)
                printf_s("\tPREFETCH and PREFETCHW Instructions\n");
            if (bSKINITandDEV)
                printf_s("\tSKINIT and DEV support\n");
            if (bSYSCALL_SYSRETAvailable)
                printf_s("\tSYSCALL/SYSRET in 64-bit mode\n");
            if (bExecuteDisableBitAvailable)
                printf_s("\tExecute Disable Bit\n");
            if (bMMXExtensions)
                printf_s("\tExtensions to MMX Instructions\n");
            if (bFFXSR)
                printf_s("\tFFXSR\n");
            if (b1GBSupport)
                printf_s("\t1GB page support\n");
            if (bRDTSCP)
                printf_s("\tRDTSCP instruction\n");
            if (b64Available)
                printf_s("\t64 bit Technology\n");
            if (b3DNowExt)
                printf_s("\t3Dnow Ext\n");
            if (b3DNow)
                printf_s("\t3Dnow! instructions\n");
            if (bNestedPaging)
                printf_s("\tNested Paging\n");
            if (bLBRVisualization)
                printf_s("\tLBR Visualization\n");
            if (bFP128)
                printf_s("\tFP128 optimization\n");
            if (bMOVOptimization)
                printf_s("\tMOVU Optimization\n");
        }
    }

    if  (nExIds >= 0x80000004)
        printf_s("\nCPU Brand String: %s\n", CPUBrandString);

    if  (nExIds >= 0x80000006)
    {
        printf_s("Cache Line Size = %d\n", nCacheLineSize);
        printf_s("L2 Associativity = %d\n", nL2Associativity);
        printf_s("Cache Size = %dK\n", nCacheSizeK);
    }


    for (i=0;;i++)
    {
        __cpuidex(CPUInfo, 0x4, i);
        if(!(CPUInfo[0] & 0xf0)) break;

        if(i == 0)
        {
            nCores = CPUInfo[0] >> 26;
            printf_s("\n\nNumber of Cores = %d\n", nCores + 1);
        }

        nCacheType = (CPUInfo[0] & 0x1f);
        nCacheLevel = (CPUInfo[0] & 0xe0) >> 5;
        bSelfInit = (CPUInfo[0] & 0x100) >> 8;
        bFullyAssociative = (CPUInfo[0] & 0x200) >> 9;
        nMaxThread = (CPUInfo[0] & 0x03ffc000) >> 14;
        nSysLineSize = (CPUInfo[1] & 0x0fff);
        nPhysicalLinePartitions = (CPUInfo[1] & 0x03ff000) >> 12;
        nWaysAssociativity = (CPUInfo[1]) >> 22;
        nNumberSets = CPUInfo[2];

        printf_s("\n");

        printf_s("ECX Index %d\n", i);
        switch (nCacheType)
        {
            case 0:
                printf_s("   Type: Null\n");
                break;
            case 1:
                printf_s("   Type: Data Cache\n");
                break;
            case 2:
                printf_s("   Type: Instruction Cache\n");
                break;
            case 3:
                printf_s("   Type: Unified Cache\n");
                break;
            default:
                 printf_s("   Type: Unknown\n");
        }

        printf_s("   Level = %d\n", nCacheLevel + 1); 
        if (bSelfInit)
        {
            printf_s("   Self Initializing\n");
        }
        else
        {
            printf_s("   Not Self Initializing\n");
        }
        if (bFullyAssociative)
        {
            printf_s("   Is Fully Associatve\n");
        }
        else
        {
            printf_s("   Is Not Fully Associatve\n");
        }
        printf_s("   Max Threads = %d\n", 
            nMaxThread+1);
        printf_s("   System Line Size = %d\n", 
            nSysLineSize+1);
        printf_s("   Physical Line Partions = %d\n", 
            nPhysicalLinePartitions+1);
        printf_s("   Ways of Associativity = %d\n", 
            nWaysAssociativity+1);
        printf_s("   Number of Sets = %d\n", 
            nNumberSets+1);
    }

    return  nRet;
}

For InfoType 0
CPUInfo[0] = 0x5
CPUInfo[1] = 0x756e6547
CPUInfo[2] = 0x6c65746e
CPUInfo[3] = 0x49656e69

For InfoType 1
CPUInfo[0] = 0xf4a
CPUInfo[1] = 0x1020800
CPUInfo[2] = 0x659d
CPUInfo[3] = 0xbfebfbff

For InfoType 2
CPUInfo[0] = 0x605b5001
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x7d7040

For InfoType 3
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 4
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 5
CPUInfo[0] = 0x40
CPUInfo[1] = 0x40
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 80000000
CPUInfo[0] = 0x80000008
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 80000001
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x1
CPUInfo[3] = 0x20100000

For InfoType 80000002
CPUInfo[0] = 0x20202020
CPUInfo[1] = 0x20202020
CPUInfo[2] = 0x20202020
CPUInfo[3] = 0x6e492020

For InfoType 80000003
CPUInfo[0] = 0x286c6574
CPUInfo[1] = 0x50202952
CPUInfo[2] = 0x69746e65
CPUInfo[3] = 0x52286d75

For InfoType 80000004
CPUInfo[0] = 0x20342029
CPUInfo[1] = 0x20555043
CPUInfo[2] = 0x30362e33
CPUInfo[3] = 0x7a4847

For InfoType 80000005
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 80000006
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x8006040
CPUInfo[3] = 0x0

For InfoType 80000007
CPUInfo[0] = 0x0
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0

For InfoType 80000008
CPUInfo[0] = 0x3024
CPUInfo[1] = 0x0
CPUInfo[2] = 0x0
CPUInfo[3] = 0x0


CPU String: GenuineIntel
Stepping ID = 10
Model = 4
Family = 15
CLFLUSH cache line size = 64
Logical Processor Count = 2
APIC Physical ID = 1

The following features are supported:
        SSE3
        MONITOR/MWAIT
        CPL Qualified Debug Store
        Enhanced Intel SpeedStep Technology
        Thermal Monitor 2
        L1 Context ID
        CMPXCHG16B Instruction
        xTPR Update Control
        x87 FPU On Chip
        Virtual-8086 Mode Enhancement
        Debugging Extensions
        Page Size Extensions
        Time Stamp Counter
        RDMSR and WRMSR Support
        Physical Address Extensions
        Machine Check Exception
        CMPXCHG8B Instruction
        APIC On Chip
        SYSENTER and SYSEXIT
        Memory Type Range Registers
        PTE Global Bit
        Machine Check Architecture
        Conditional Move/Compare Instruction
        Page Attribute Table
        36-bit Page Size Extension
        CFLUSH Extension
        Debug Store
        Thermal Monitor and Clock Ctrl
        MMX Technology
        FXSAVE/FXRSTOR
        SSE Extensions
        SSE2 Extensions
        Self Snoop
        Multithreading Technology
        Thermal Monitor
        Pending Break Enable
        LAHF/SAHF in 64-bit mode
        64 bit Technology

CPU Brand String:               Intel(R) Pentium(R) 4 CPU 3.60GHz
Cache Line Size = 64
L2 Associativity = 6
Cache Size = 2048K


Number of Cores = 1

ECX Index 0
   Type: Data Cache
   Level = 2
   Self Initializing
   Is Not Fully Associatve
   Max Threads = 2
   System Line Size = 64
   Physical Line Partions = 1
   Ways of Associativity = 8
   Number of Sets = 32

ECX Index 1
   Type: Unified Cache
   Level = 3
   Self Initializing
   Is Not Fully Associatve
   Max Threads = 2
   System Line Size = 64
   Physical Line Partions = 2
   Ways of Associativity = 8
   Number of Sets = 2048

Share via

cpuid, cpuidex

Parameters

Requirements

Remarks

Example

See Also

Reference

Additional resources

Share via

__cpuid, __cpuidex

Parameters

Requirements

Remarks

Example

See Also

Reference

Additional resources

cpuid, cpuidex