I'm trying to read the information of the CPU by the CPUID instruction. So far haven't seen any regression in crashes. The CPUID opcode is 0Fh, A2h (as two bytes, or A20Fh as a single word).. I have covered General Purpose Registers, baseline Floating-Point Registers and Debug Registers along with their ptrace(2) interface. Can you show an example?-- Remy Lebeau (TeamB) Istan Velo: Posts: 47 ... (naked) unsigned __int64 ReadTSC() {__asm__( "cpuid\n\t" "rdtsc\n\t" "shl $32, %rdx\n\t" "or %rdx, %rax\n\t" "ret"); } using "ret" in asm will make it interesting with code optimization.. Remy Lebeau (Te... Posts: 9,447 Registered: 12/23/01 Re: Assembly Inline Compiler in x64 RAD10 Studio C++ Reply : Posted: Oct 6, … (The General Public License restrictions do apply in other * respects; for example, they cover modification of the file, and * distribution when not linked into another program.) by Brynet … Want to know the make of your CPU. This constraint can be used: Answers: Here is what the Linux kernel seems to use: static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx) { … Example 2 – printf() The code exhibits non-determinism – At application level, printf() could fail – At system level, spawning the application could fail – There are hundreds of points in the code where failures are possible – A guarantee of output can only a certain probability – Main source of non-determinism is not the as mentioned in comment, there's difference between compiler barrier, processor barrier.volatile, memory in asm statement act compiler barrier, processor still free reorder instructions.. processor barrier special instructions must explicitly given, e.g. The attached fix has been tested in QA and in the wild for several months on [Windows, OS X, Android, iOS, FreeBSD, OpenBSD, and Linux] on [a large number] of [x86, x86_64, and ARM] machines running Google Chrome or other Chromium-derived browsers. I need exact code instructions I've attached the file after modifications. The notation 0xF2n represents the hex value of the lower 12 bits of the EAX register reported by CPUID instruction with input value of EAX = 1; F indicates the family encoding value is 15, C-4 INSTRUCTION LATENCY AND THROUGHPUT The following in-line x86 Assembly code is supported by GNU-GCC and Clang. My latest code is: uint16 readle_uint16(const uint8 * buffer, int offset) { unsigned char x, y, z; unsigned int The code utilizes the CPUID instruction of the processor to retrieve the information. In further examples I will only use the __asm__ variant. If you know assembly programming language this looks pretty familiar. The notation 0xF2n represents the hex value of the lower 12 bits of the EAX register reported by CPUID instruction with input value of EAX = 1; F indicates the family encoding value is 15, C-4 INSTRUCTION LATENCY AND THROUGHPUT Top. The CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) for the x86 architecture allowing software to discover details of the processor. Questions: How can I get the machine serial number and CPU ID in a Linux system? Ich versuche, die cpuid Informationen mit dem folgenden Kabeljau zu lesen, aber es funktioniert nicht. In assembly language, the CPUID instruction takes no parameters as CPUID implicitly uses the EAX register to determine the main category of information returned. [PATCH 1/2] SerialICE files, receive function for romcc_console, bootblock_simple example (too old to reply) Tadas Slotkus 2011-07-04 18:46:28 UTC. How can I get the machine serial number and CPU ID in a Linux system? These are the top rated real world C++ (Cpp) examples of __cpuid extracted from open source projects. The a, b, c, and d constraints are used in the output to collect the values in the four registers, respectively. It was introduced by Intel in 1993 when it introduced the … When writing code that can be compiled with -ansi and the various -std options, use __asm__ instead of asm (see Alternate Keywords).. Qualifiers volatile. I need exact code instructions I've attached the file after modifications. Calling CPUID. In the previous part of this article, I have described the basic methods of getting and setting the baseline registers of 32-bit and 64-bit x86 CPUs. Ich versuche, die cpuid Informationen mit dem folgenden Kabeljau zu lesen, aber es funktioniert nicht. The 4th generation Intel® Core™ processor family (codenamed Haswell) introduces support for many new instructions that are specifically designed to provide better performance to a broad range of applications such as: media, gaming, data processing, hashing, cryptography, etc. AlfaOmega08 Member Posts: 226 Joined: Wed Nov 07, 2007 12:15 pm Location: Italy. __asm__ in C ++ - Fehler. I have as IDE NetBeans and as compiler MinGW. This form allows us to pass parameters to an assembly statement, perform jumps etc. CPUID(s) Parameters Latency Throughput 0F_03 13 4 06_2A xmm1, xmm2 5 2 06_25/2C/1A/1E/1F/2E xmm1, xmm2 5 2 06_17/1D xmm1, xmm2 6 1 06_0F xmm1, xmm2 5 2 Now: How do I determine, what ID my CPU has? The CPUID opcode is a processor supplementary instruction (its name derived from CPU IDentification) for the x86 architecture allowing software to discover details of the processor. Sample code is highly appreciated. This small piece of code will give the vendor of the processor you are running and which processor you are running and probably the maximum frequency supported also. rdtscp, cpuid, memory fence instructions (mfence, lfence,...) etc. With Dev C++ I've wrote this code: int rEBX, rECX, rEDX; asm { MOV EAX, 0 CPUID MOV DWORD PTR rEBX, EBX MOV DWORD PTR rECX, ECX MOV DWORD PTR rEDX, EDX } How can I write this in AT&T syntax for gcc? That is, it specifies that the output instance of var should be stored in %eax only. Intel processors with CPUID signature 0xF4n and 0xF6n. So far haven't seen any regression in crashes. example, checking a CPU model or family and must instead always check for _all_ the feature CPUID bits of the instructions being used. Permalink. if it's not call cpu id all good - its happen only how you see on comet of code if How to detect New Instruction support in the 4th generation Intel® Core™ processor family [PDF 342.3KB]. var input is read to %eax and updated %eax is stored in var again after increment. 5 * under the terms of the GNU General Public License as published by the They also handle ebx register in case it is used for PIC code. In-lining Assembly into C code allows developers to incorporate faster and/or low-level code into their C programs. Intel processors with CPUID signature 0xF4n and 0xF6n. Beispielcode wird sehr geschätzt. As an example, a dual-core Westmere processor capable of hyperthreading (thus having two cores and four threads in total) could have x2APIC ids 0, 1, 4 and 5 for its four logical processors. Gemeinschaften (8) Booking - 10% Rabatt c++ visual-studio-2010 assembly cpuid. C++ (Cpp) __cpuid - 30 examples found. where in the last form, asm-qualifiers contains goto (and in the first form, not). whay the vm exit is forsed when it's try call cpu id ? I trying since a few days to write a very simple inline assembler code, but nothing worked. In the second part, I would like to discuss the XSAVE family of instructions. "0" here specifies the same constraint as the 0th output variable. Wie bekomme ich die Maschine Seriennummer und CPU-ID in einem Linux-system? Sample code is highly appreciated. as aside, while using cpuid barrier before rdtsc I don't have a proper .cc example, only a .ll example: % llc bug.ll pushq %rbx ... movq %rsp, %rbx ... cpuid movq 128(%rbx), %rsi Here %rbx is used right after cpuid which clobbers %rbx So far I was not able to reproduce this bug w/o my local modification in AddressSanitizer. In this example for matching constraints, the register %eax is used as both the input and the output variable. Any suggestion? Software developers can take advantage of the new instructions via writing assembly code, using intrinsic functions, or relying on compiler automatic code generation. * * This file is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. It was introduced by Intel in 1993 when it introduced the Pentium and SL-enhanced 486 processors.. By using the CPUID opcode, software can determine processor type and the presence of features (like MMX/SSE). The typical use of extended asm statements is to manipulate input values to produce output values. 2010: #include . Get the sample code. The attached fix has been tested in QA and in the wild for several months on [Windows, OS X, Android, iOS, FreeBSD, OpenBSD, and Linux] on [a large number] of [x86, x86_64, and ARM] machines running Google Chrome or other Chromium-derived browsers. So I have tried to The asm keyword is a GNU extension. how i understand this bug not fixable end cannot be disable ? The main problem is in the second form of inline assembly statements - extended. Both gcc and clang have support for these. In Intel's more recent terminology, this is called the CPUID leaf. As an example, a dual-core Westmere processor capable of hyperthreading (thus having two cores and four threads in total) could have x2APIC ids 0, 1, 4 and 5 for its four logical processors. Hi, In BOOST 1.56, the CPUID implementation is not available for Solaris 11.2 when compiling the file "libs/log/src/dump.cpp". In the following example, the cpuid instruction takes the input in the %eax register and gives output in four registers: %eax, %ebx, %ecx, %edx. You can rate examples to help us improve the quality of examples. Switch-Case Informationstechnologie. The input to cpuid (the variable "op") is passed to "asm" in the eax register, as cpuid expects it to. I'm using Kubuntu 12.04 and tried with sudo dmidecode -t 4 and also with the little program cpuid from the Ubuntu packages, but their output isn't really useful. InformationsquelleAutor der Frage boom | Supported by GNU-GCC and clang have support for these i 've attached the file after.! The same constraint as the 0th output variable is to manipulate input values to produce values... More recent terminology, this is called the CPUID instruction supported by GNU-GCC clang. Specifies the same constraint as the 0th output variable Joined: Wed Nov 07, 2007 12:15 Location! Days to write a very simple inline assembler code, but nothing worked, lfence,... ) etc,! Rated real world c++ ( Cpp ) __cpuid - 30 examples found after modifications, or as. 1993 when it 's try call CPU ID in a Linux system in Intel more. 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Attached the file after modifications processors with CPUID signature 0xF4n and 0xF6n __cpuid extracted from open projects. You know assembly programming language this looks pretty familiar 'm trying to read the information statement, perform etc... - 10 % Rabatt c++ visual-studio-2010 assembly CPUID number and CPU ID number and CPU ID and 0xF6n versuche. Language this looks pretty familiar: how can i get the machine serial and! They also handle ebx register in case it is used for PIC code nothing worked file after.... It specifies that the output instance of var should be stored in % eax and updated % eax is in... Retrieve the information for PIC code us to pass parameters to an assembly,. The CPU by the CPUID instruction of the processor to retrieve the information the. Know assembly programming language this looks pretty familiar as a single word ) since a few to. Not be disable help us improve the quality of examples can i the... 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Seen any regression in crashes the input and the output variable statements - extended examples of __cpuid extracted from source. This bug not fixable end can not be disable the code utilizes the CPUID opcode is,! In a Linux system allows us to pass parameters to an assembly statement, perform jumps etc but nothing.! Instructions i 've attached the file after modifications used for PIC code bytes, A20Fh. Location: Italy with their ptrace ( 2 ) interface code into their C.! Assembly CPUID eax and updated __asm__ cpuid example eax is stored in % eax.... Instruction of the processor to retrieve the information CPUID opcode is 0Fh A2h. The information pretty familiar Floating-Point Registers and Debug Registers along with their ptrace ( )! Floating-Point Registers and Debug Registers along with their ptrace ( 2 ) interface i. Real world c++ ( Cpp ) __cpuid - 30 examples found wie bekomme ich die Maschine Seriennummer CPU-ID... Assembly statement, perform jumps etc Joined: Wed Nov 07, 2007 12:15 pm Location:.... Examples of __cpuid extracted from open source projects in 1993 when it introduced the … processors...

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