Output from cpuid instruction depends on as well as gets stored in general purpose registers like eax, ebx etc. Core™ i3 But the CPU IDs are equal: F106 0400 FFFB EBBF. This method uses the ID flag in bit 21 of the EFLAGS register. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. i3-3xxE, i3-3xxM, i3-3xxUM Try these quick links to visit popular site sections. Modified Table 5-1 to include new Brand ID values supported by the Intel® processors with Intel NetBurst® microarchitecture. Information in this article is intended as a convenient summary of the contents of the "Intel® Processor Identification and the CPUID Instruction" application note and the official Intel® product information source. (Please notify the author of any such discrepancy). Package cpuid provides information about the CPU running the current program. 0000014790 00000 n 0000014368 00000 n 6679 0 obj<>stream According to Wikipedia, instruction POPCNT, population count (count number of bits set to 1), support is indicated via the CPUID.01H;ECX.POPCNT[Bit 23] flag. x86info. Note: In the first days of the CPUID instruction, it was only Intel CPUs that supported it. ; x86info command – Show x86 CPU diagnostics. The CPUID instruction can be used to check whether the central processing unit (CPU) supports the RDRAND instruction on both AMD and Intel CPUs. 9xx, B9xx cpuid Intel CPUID library for Go Programming Language. CPUID Instruction Viewer is a small utility designed to help developers view technical information returned by the CPUID instruction from the x86 and x86-64 instruction sets. For more information about the specific parameters to use and the values returned by these intrinsics on Intel processors, see the documentation for the cpuid instruction in Intel 64 and IA-32 Architectures Software Developers Manual Volume 2: Instruction Set Reference and Intel Architecture Instruction Set Extensions … i5-3xxx-T/S/M/K/ME Core™ i7 The CPUID field is a combination of the processor family, processor model, and processor stepping reported in a hexadecimal format. 0000002326 00000 n N2000 series: N26xx, N28xx 0000005628 00000 n i5-4xxM/UM, i5-5xxE/M/UM C0 is the operational state, meaning that the CPU is doing useful work. The CPUID signature and microcode revision cannot be easily found by the average user. The time stamp disable (TSD) flag in register CR4 restricts the use of the RDTSCP instruction as follows. Intel® Processor Identification and the CPUID Instruction Application Note 486 February 2004 Document Number: 241618-025 R So, I created a little PowerShell script to get basic CPU information, including the CPUID signature and the system's current microcode revision. Memory type, size, timings, and module specifications (SPD). ; cpuid command – Dump CPUID information for each CPU. Core™ 2 Extreme, Xeon® 3000 Core™ i3 for a basic account. Sample code to extract cpu information using CPUID instruction - cpuinfo.cpp. 0000002538 00000 n This bit is modifiable only when the CPUID instruction is supported. ... Instruction TLB: 4-KByte pages, 8-way set associative, 64 entries L2 TLB: 1-MB, 4-way set associative, 64-byte line size Serializing instruction execution guarantees that any modifications to flags, registers, and memory for previous instructions are completed before the next instruction is fetched and executed (see "Serializing Instructions" in Chapter 7 of the Intel … In particular, the program must detect the presence of a 32-bit x86 processor, which supports the EFLAGS register. Prior to using the CPUID instruction, you should also make sure the processor supports it by testing the 'ID' bit (0x200000) in eflags. This instruction operates the same in non-64-bit modes and 64-bit mode. All information provided is subject to change at any time, without notice. Xeon® 5000/3000, E3xxx Overview. E7xxx, E8xxx If supported, bit 30 of the ECX register is set after calling CPUID standard function 01H. 0 T3200 This application note explains how to use the CPUID instruction in software applications, BIOS implementations, and various processor tools. Description. The package gathers all information during package initialization phase so its public interface will not need to execute the CPUID instruction … Intel implements POPCNT beginning with the Nehalem microarchitecture and AMD with the Barcelona microarchitecture. The brand index provides an entry point into a brand identification table that is maintained in memory by system software and is accessible from system- and user-level code. i7-8xx, i7-8xxS, i7-8xxK Such results are intended to be viewed along with the accompanying Intel … Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. CPUID instruction. Core™ i7 Extreme The information in the table below is composed from the "Intel® Processor Identification and the CPUID Instruction" and the official Intel product information source. RDSEED availability can be checked on Intel … Sign up here 0000010255 00000 n Pentium™ Mobile CPUID for Intel Core i7-6700HQ. L33xx, X3350, Celeron™ Desktop In this table, each bra… 0000012994 00000 n Note:Implementing this routi… The cpuid package provides convenient and fast access to information from the x86 CPUID instruction. 0000010959 00000 n 0000011901 00000 n Correction: lfence is serializing on the instruction stream, without flushing the store buffer.It's sufficient for lfence; rdtsc.It's not "a serializing instruction" in the full technical sense like cpuid or iret.And mfence is serializing on AMD according to documentation, and in practice also on some Intel CPUs like Skylake, possibly a … 0000013383 00000 n 0000014920 00000 n Using the brand string feature, future IA-32 architecture based processors will return their ASCII brand identification string and maximum operating frequency via an extended CPUID instruction. lscpu command – Show information on CPU architecture. Information contained are specific to the Intel® Xeon® Processor 5000 Sequence. 0000013961 00000 n If a software procedure can set and clear this flag, the processor executing the procedure supports the CPUID instruction. lscpu command – Show information on CPU architecture. The Model number is an 8 bit number derived from the processor signature by shifting the Extended Model number (bits 19:16) 4 bits to the left and adding the Model number (bits 7:4 ) . 执行CPUID指令后,扩展功能标志在EDX和ECX中返回,EDX中的定义如下: Bit Name Description ----- 10:00 Reserved 11 SYSCALL SYSCALL/SYSRET 19:12 Reserved 20 XD Bit Execution Disable Bit 28:21 Reserved 29 Intel® 64 Intel® 64 Instruction Set Architecture 31:30 Reserved How to Benchmark Code Execution Times ®on Intel IA-32 and IA-64 Instruction Set Architectures 10 natural choice to avoid out of order execution would be to call CPUID just before both RTDSC calls; this method works but there is a lot of variance (in terms of clock cycles) that is intrinsically associated with the CPUID instruction execution i3-5xx See section 5.1.2.2 of the, The Model number is an 8 bit number derived from the processor signature by shifting the Extended Model number (bits 19:16) 4 bits to the left and adding the Model number (bits 7:4, "Intel® Processor Identification and the CPUID Instruction", official Intel product information source, "Intel Processor Identification and the CPUID Instruction", official Intel® product information source, http://www.intel.com/products/processor_number. When working on an test machine running Windows Server on a cloud we run a Windows application. Note that there are about 5 CPUID leaves where the cache size information can be specified. username Description. Published:06/15/2012   It uses WMI (Windows Management Information)'s Processor class to query how many processors there are. 0000012044 00000 n This article is intended to aid software developers in understanding the "big picture" of Intel's recent architecture and processor releases. Pentium™ History; Calling CPUID… Real time measurement of each core's internal frequency, memory frequency. Core™ 2 Duo 0000006678 00000 n If supported, bit 30 of the ECX register is set after calling CPUID standard function 01H. Historically, Intel processors from the Pentium Pro onwards have a maximum CPUID input value of only 02h or 03h. Has anybody gotten the Intel CPUID instruction (assembly language only as far as I know) to work with CVF? CPUID instruction. startxref The Brand string is a new extension to the CPUID instruction implemented in some Intel IA-32 processors, including the Pentium 4 processor. 0000014509 00000 n 0000011326 00000 n The Intel486 family and subsequent Intel processors provide a straightforward method for determining whether the processor's internal architecture is able to execute the CPUID instruction. This table includes the Atom™ processors on 45nm and later process technology. 0000011758 00000 n I use BMI instructions in some highly optimized part of my software so I wonder what the BIOS workaround is doing: H;판R`,[f6=���ؐ�)ѕ�zV_�;=�V㆐`�L�#��K���^ The first step is to query the processor to find out the highest input value CPUID recognises, by executing CPUID with the EAX register set to 0. The cpuid package provides convenient and fast access to information from the x86 CPUID instruction. 06/01-019 Changed to use registered trademark for Intel® Celeron® throughout entire document. Skip to content. CPUID Instruction Viewer is a small utility designed to help developers view technical information returned by the CPUID instruction from the x86 and x86-64 instruction sets. 0000000016 00000 n Xeon® E3, i3-21xx/23xx-T/M/E/UE 0000001474 00000 n Please read and understand these important disclaimers prior to use. It was introduced by Intel in 1993 with the launch of the Pentium and SL-enhanced 486 processors. x86info is a program which displays a range of information about the CPUs present in an x86 system. Older operating systems like Windows 95/98 and Windows Me were released before the Intel Pentium 4 with HTT, and are therefore … Please read and understand these important disclaimers prior to use. 0000012401 00000 n For systems that don't support CPUID, changing the 'ID' bit will have no effect. The information returned has a different meaning depending on the value passed as the function_id parameter. 0000011052 00000 n The evolution of processor identification was necessary because, as the Intel Architecture proliferates, the Please contact system vendor for more information on specific products or systems. The CPUID model number is a convenient way of anticipating the model specific functionality that is available at runtime and subsequently designing the architecture specific parts of software (nevertheless, at runtime, the feature bits in the CPUID should always be verified before use). CPUID instruction not only provides the processor signature, but also provides information about the features supported by and implemented on the Intel processor. It was introduced by Intel in 1993 when it introduced the Pentium and SL-enhanced 486 processors. 0000002756 00000 n Memory type, size, timings, and module specifications (SPD). Idle States. This was developed in the early 1990s for what was then Intel’s new Pentium processor but it also exists in some models of Intel’s 80486 processor and … The "tick tock" model adds predictability to the Intel® architecture roadmap. CPU features are detected on startup, and kept for fast access through the life of the application. This is the closet tool to CPU-Z app on Linux. Xeon® 3000, G69xx The package gathers all information during package initialization phase so its public interface will not need to execute the CPUID instruction at runtime. Mainboard and chipset. All gists Back to GitHub ... // This seems to be working for both Intel & AMD vendors: for (int i= 0x80000002; i< 0x80000005; ++i) {CPUID cpuID (i, 0); … Celeron™ Desktop, 30xx 0000013812 00000 n password? The CPUID Instruction . Prior to using the CPUID instruction, you should also make sure the processor supports it by testing the 'ID' bit (0x200000) in eflags. X7xxx, Celeron™ Desktop Xeon® 3000, Core™ i5 Core™ 2 Extreme M, L7xxx,T5xxx,T7xxx,U7xxx If a software procedure can set and clear this flag, the processor executing the procedure supports the CPUID instruction. 0000012128 00000 n Sample code to extract cpu information using CPUID instruction - cpuinfo.cpp. While the general Instruction Set Architecture (ISA) and feature set within a given architecture are identical, certain model specific variations occur, and are generally enumerated through CPUID interrogation[1]. The ID flag (bit 21) in the EFLAGS register indicates support for the CPUID instruction. 0000007072 00000 n RDSEED availability can be checked on Intel CPUs in a similar manner. 0000011613 00000 n 0000012692 00000 n This application note explains how to use the CPUID instruction in software applications, BIOS implementations, and … Reached 3392 MHz with a Intel Core i3 3240 MB: Gigabyte H61M-DS2 4.0 - RAM: 8192MB GEIL Anonymous December 15th, 2020 Reached 3691 MHz with a Intel Core i7 8700K MB: Asus PRIME B360-PLUS - RAM: 32768MB Corsair Xeon® 3000, i5-7xx, i5-7xxS 0000014081 00000 n �o�h��* �qL � Core™ i7 I use BMI instructions in some highly optimized part of my software so I wonder what the BIOS … [2] In Linux*-based operating systems you can type ‘cat /proc/cpuinfo' to obtain the processor family and model numbers (note they are formatted in decimal, while the tables in this article containhexadecimal formatting of these numbers). Core™ i5 ; x86info command – Show x86 CPU diagnostics. P6xxx, U5xxx L52xx, E31xx, Xeon® 3000 L34xx, Core™ i7 Note that the CPU stepping reported in the … Core™ i5 Core™ i7 Extreme Core™ i5 0000003050 00000 n i7-6xxE/LE/UE/M/LM/UM, Pentium™ Desktop 0000004999 00000 n 0000010713 00000 n Order Number: 241618-039 Intel® Processor Identification and the CPUID Instruction Application Note 485 May 2012 Overview. Intel® processor numbers are not a measure of performance. The CPUID instruction can be executed at any privilege level to serialize instruction execution. Real time measurement of each core's internal frequency, memory frequency. Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. x86info. By taking advantage of the CPUID instruction, software developers See “Time Stamp Counter” in Chapter 17 of the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B, for specific details of the time stamp counter behavior. i7-3920XM Next -- if it is a Cyrix or a NexGen processor -- the CPUID instruction may have to be enabled. Xeon® E3, i3-31xx/32xx-T/U The information herein is provided "as-is" and Intel does not make any representations or warranties whatsoever regarding accuracy of the information, nor on the product features, availability, functionality, or compatibility of the products listed. cpuid Intel CPUID library for Go Programming Language. It was introduced by Intel in 1993 when it introduced the Pentium and SL-enhanced 486 processors. �RsȨi� )ҭqk վx���Y�b��{Y%����T᪪�(��K�Z���*I���D���G���[�W���M���]�����$o����E�/P%b�6��}�S����K�~e�׈����Zq�RS&�v���I>�ZL˩�:��Kg�)��}��`��b��5��O9��.��x�mKͳ�ɩrQ�����#}��\�5�����s����� �|�E�ЎmD!Y�S�:Z{�j���K�\�����0Xm��+���s��e�~����/0���Z5�m��{@"��� ��O��X��l� 9�-ڨ����h�]W�Jť�h��N���K���*) (q���3A�0i{_�̎�sq�^���X �K���9N��l���-Ѯ~�&�wb��:B�J���O&ٔkO.��! The cpuid package provides convenient and fast access to information from the x86 CPUID instruction. The package gathers all information during package initialization phase so its public interface will not need to execute the CPUID instruction at runtime. 0000013655 00000 n It is said that CPUID is "incorrectly indicating the presence of BMI1 or BMI2 instruction set extensions" and that "Attempting to use instructions from the BMI1 or BMI2 instruction set extensions will result in a #UD exception." The ID flag (bit 21) in the EFLAGS register indicates support for the CPUID instruction. Celeron™ Mobile 0000010869 00000 n G4xx, G5xx In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) allowing software to discover details of the processor. See section 5.1.2.2 of the "Intel Processor Identification and the CPUID Instruction". Description. Core™ 2 Extreme 0000007316 00000 n Because such software would have problems with all non-Intel CPUID enabled CPUs, some CPUs have the capability to change … The Intel® 64 and IA-32 Architectures Software Developer's Manual consists of eight volumes: Basic Architecture, Instruction Set Reference A-M, Instruction Set Reference N-Z, Instruction Set Reference, System Programming Guide Part 1, System Programming Guide Part 2, System Programming Guide Part 3, and System Programming Guide Part 4. D��-q���9$8�r�R=z���NR� ��Z����@Eݛ�%k99�n�F7|n���#RK/��(š�b�KǍg�m�vd�v�upo�����/���ܢ��߫Δ�;-&�� ���@)9�"d�+YV����Y�d��0�ubG����m�v1�GB@]���`�;�����?� The brand index was added to the CPUID instruction with the Pentium III Xeon processor and will be included on future IA-32 processors, including the Pentium 4 processors. i7-2xxx-S/K/M/QM/LE/UE/QE Core™ i7 0000010047 00000 n If software can change the value of this flag, the CPUID instruction is … Next -- if it is a Cyrix or a NexGen processor -- the CPUID instruction … Before trying to rely upon CPUID, a program must properly detect and sometimes enable the instruction. ; cpuid command – Dump CPUID information for each CPU. Modified Table 1 to include the information returned by the extended CPUID functions. (�Y l�^'��r� ��0�:(�����9�. 0000014202 00000 n The Intel® 64 and IA-32 architectures software developer's manuals are now available for download via one combined volume, a four volume set or a ten volume set. %PDF-1.6 %���� If you want to get information from CPU directly, read the CPUID instruction description in Intel Architecture Manual. In particular, the program must detect the presence of a 32-bit x86 processor, which supports the EFLAGS register. AMD processors are checked for the feature using the same test. The maximum CPUID input value determines the values that the operating syst… When the computer is booted up, the operating system executes the CPUID instruction to identify the processor and its capabilities. This determines the kind of basic information CPUID can provide the operating system. trailer Core™ 2 Quad xref Forgot your Intel Processor numbers differentiate features within each processor family, not across different processor families. All CPUIDs » Intel Core i7 Mobile family » Model i7-6700HQ » PN# CL8066202194635 » Posted by [anonymous] Jump to. [1] Contents. Core™ i7, P4xxx, U3xxx Currently x86 / x64 (AMD64) is supported, and no external C (cgo) code is used, which should make the library very easy to use. 0000010158 00000 n 0000006222 00000 n Core™ i7 For systems that don't support CPUID, changing the 'ID' bit will have no effect. E3-12xx, Celeron™ Mobile X34xx, Core™ i7 Extreme Core™ i7 Extreme The evolution of processor identification was necessary because, as the Intel Architecture proliferates, the computing market … E5xxx, E6xxx, E6xxxK Pentium™ Mobile These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. [1] For an example of interrogating CPUID to verify features please read Using CPUID to Detect the presence of SSE 4.1 and SSE 4.2 Instruction Sets. This intrinsic stores the supported features and CPU information returned by the cpuid instruction in cpuInfo, an array of four 32-bit integers that's filled with the values of the EAX, EBX, ECX, and EDX registers (in that order). 06/01-019 Changed to use registered trademark for Intel® Celeron® throughout entire document. If I had not read the previous articles I listed this one would have confused me so much.EDIT: Still looking for the AMD CPUID specification document, if anyone knows where I can get this it would be most appreciated. The CPUID opcode is a processor supplementary instruction (its name derived from CPU IDentification) for the x86 architecture. 0000014654 00000 n 0000006447 00000 n intel® AP-485 APPLICATION NOTE Intel Processor Identification and the CPUID Instruction December 1996 I Order Number: 241618-005 For identifying a particular processor, please use the Intel® Processor Identification Utility for Microsoft Windows* operating systems or the bootable version for other operating systems[2]. CPU features are detected on startup, and kept for fast access through the life of the application. The -EX suffix denotes a Multi-Processor (MP), meaning this processor is designed to operate in a Multiprocessor platform, but can still operate in a Single or Dual processor platform configuration. Mainboard and chipset. With this feature, the CPUID instruction returns the ASCII brand identification string and the maximum operating frequency of the processor to the EAX, EBX, ECX, and EDX registers. The evolution of processor identification was necessary because, as the Intel Architecture proliferates, the 0000012820 00000 n Using the brand string feature, future IA-32 architecture based processors will return their ASCII brand identification string and maximum operating frequency via an extended CPUID instruction. QX9xxx It is said that CPUID is "incorrectly indicating the presence of BMI1 or BMI2 instruction set extensions" and that "Attempting to use instructions from the BMI1 or BMI2 instruction set extensions will result in a #UD exception." N5xx, D5xx (dual core). EPT Intel Extended Page Table FLEXPRIORITY Intel FlexPriority TPR_SHADOW Intel TPR Shadow VMMCALL Prefer vmmcall to vmcall VNMI Intel Virtual NMI VPID Intel Virtual Processor ID XENPV Xen paravirtual guest Intel-defined CPU features. File name: manual_id297628.pdf Downloads today: 456 Total downloads: 6628 File rating: 8.37 of 10 File size: ~1 MB Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. 0000010603 00000 n AMD processors are checked for the feature using the same test. Modified Table 5-1 to include new Brand ID values supported by the Intel® processors with Intel NetBurst® microarchitecture. 0000003088 00000 n 0000010480 00000 n This table includes the mainline processors on 90nm and later process technology. Core™ i5 The CPUID instruction returns results about the capabilities and features supported by the processor that this utility is running on. 0000003166 00000 n E3-12xxV2, Core™ i3 AP-485 Intel® Processor Identification and the CPUID Instruction. cpuid instruction can be used in intel processor to get cpu specific information. [1] Contents. E1600, Core™ 2 Duo M Idle States (C-states) are used to save power when the processor is idle. 0000011208 00000 n Intel may make changes to manufacturing life cycle, specifications, and product descriptions at any time, without notice. Fffb EBBF CPUID package provides convenient and fast access through the life of the application are about CPUID! Specifications ( SPD ) the mainline processors on 90nm and later process technology field a! Product User and Reference Guides for more information on specific products or systems depending on the Intel Pentium with! Along with the CPUID instruction at runtime is set after calling CPUID standard function 01H description in Intel architecture.! Please consult section 2: Usage Guidelines of the EFLAGS register of discrepancy, the information returned the... And various processor tools many processors there are about 5 CPUID leaves where the size! Consult section 2: both Xeon 14 core 2.6 GHz later process technology Table 1 to include the information the! If it is a program which displays a range of information about the features supported by the Intel® with... Using CPUID instruction in software applications, BIOS implementations, and product information source supersede the contents of article. Has a different meaning depending on the value passed as the function_id parameter degree... By this notice and features supported by the processor that this utility is free that. Processor families 4 processor compilers may or may not optimize to the Intel® Xeon® processor 5000 Sequence important prior! Spd ) the accompanying Intel … CPUID instruction mainline processors on 45nm and later process technology ( )! The current program executes the CPUID package provides convenient and fast access to information the! As far as I know ) to work with CVF and more from CPUID instruction '' directly, the... Instruction at runtime code to extract CPU information using CPUID instruction not only provides the processor signature, also! Capabilities and features supported by the processor executing the procedure supports the EFLAGS register Windows application tool... Instruction implemented in some Intel IA-32 processors with Intel NetBurst® microarchitecture a combination the. The procedure supports the EFLAGS register indicates support for the proper use CPUID. And 64-bit mode it is a combination of the CPUID instruction description Intel. Cpu running the current program as I know ) to work with?. On specific products or systems in a hexadecimal format: 241618-039 Intel® processor Identification and the package... Intel core i7 Mobile family » model i7-6700HQ » PN # CL8066202194635 » Posted by [ anonymous ] Jump.! I know ) to work with CVF x86 or x64 processor is the state... And the CPUID instruction at runtime we run a Windows application processor tools Number: 241618-039 Intel® processor and. These quick links to visit popular site sections when there … the amount of errors in the EFLAGS indicates... ] Jump to amd processors are checked for the x86 CPUID instruction in applications! Sometimes enable the instruction in the Pentium and SL-enhanced 486 processors of this article this article of article. Value passed as the function_id parameter and implemented on the value passed as the function_id parameter changes to manufacturing cycle! Introduced by Intel in 1993 when it introduced the Pentium and SL-enhanced processors... By and implemented on the value passed as the function_id parameter such results are intended for use with Intel.... Memory frequency CPUID package provides convenient and fast access through the life of the processor that this utility running! History ; calling CPUID… note: in the original application note 485 may 2012 download CPUID instruction first days the... - cpuinfo.cpp only Intel CPUs that supported it properly detect and sometimes enable the instruction or not. Primary means of identifying a modern x86 or x64 processor is idle any time, without notice on the passed... When it introduced the Pentium and SL-enhanced 486 processors the operating system executes the CPUID at... In the EFLAGS register indicates support for the x86 CPUID instruction is supported instruction at.! And implemented on the value passed as the function_id parameter in Intel architecture.! As follows meaning depending on the value passed as the function_id parameter internal frequency, memory frequency by! Read and understand these important disclaimers prior to use the CPUID instruction at runtime in non-64-bit modes 64-bit. Manufactured by Intel but also provides information about the CPUs present in an x86.! Are specific to Intel microprocessors 0x00000007:0 ( ebx ), word 9 lscpu command – Dump CPUID information for CPU... `` big picture '' of Intel 's compilers may or may not optimize to the Intel® roadmap! Doing useful work booted up, the program must properly detect and sometimes enable the instruction Xeon... Supported by the extended CPUID functions is idle CPUID instruction to identify a processor, and SSSE3 sets! Discrepancy, the processor executing the procedure supports the EFLAGS register indicates support for the package! » model i7-6700HQ » PN # CL8066202194635 » Posted by [ anonymous ] Jump to version of the application Hyper-Threading. In particular, the operating system microprocessor-dependent optimizations in this product are intended to be enabled reserved for Intel.... ) flag in bit 21 ) in the original application note explains how to use this is the document. Intel in 1993 with the accompanying Intel … CPUID Intel CPUID instruction Intel® processor Identification and the CPUID field a! The applicable product User and Reference Guides for more information on CPU architecture is free software can... Real time measurement of each core 's internal frequency, memory frequency identify a processor supplementary instruction ( its derived... Register is set after calling CPUID standard function 01H try these quick links visit., but also provides information about the capabilities and features supported by and on. Bit 21 of the CPUID instruction is supported assembly language only as far as know. Brand index and brand string is a program must detect the presence of a 32-bit x86,... Information on CPU architecture are specific to Intel microarchitecture are reserved for Intel microprocessors microprocessor-dependent optimizations this...

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