cpuid | 易学教程

Linux环境系列之【配置虚拟机常见问题2】

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 闲话不多说,接着上一篇 2.3.2问题2：计算机虚拟化禁用了禁用参考： https://jingyan.baidu.com/article/fc07f98976710e12ffe519de.html 注意：不同电脑的BIOS设置不同，找“ Intel Virtualization Technology ”相关资源即可。步骤一：电脑重启时，进入bios中（可能按键：F2、F8、F12、Delete ）步骤二：选择advanced选项卡，选择CPU setup,按enter键进入步骤三：开启虚拟化，选择 Intel Virtualization Technology ，修改成“ Enabled ” 步骤四：保存并退出（F10） 2.3.3问题3：虚拟机被移动点击“我已复制该虚拟机” 2.3.4问题4：不支持CPUID错误先“确定”，再“放弃” 2.3.5问题5：第一次使用虚拟机勾选复选框，点击确定 2.3.6问题6：权限不足右键“以管理员运行”VMware Workstation 2.3.7问题7：计算机配置问题解决方案：去bios中开启“虚拟化”支持。参考： https://jingyan.baidu.com/article/fc07f98976710e12ffe519de.html 2

Concatenating strings from registers and printing them

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问题 I am trying to call cpuid and print output from EBX, ECX and EDX to console, but it prints empty line instead here is my code: .586 .model flat,stdcall option casemap:none include \masm32\include\windows.inc include \masm32\include\kernel32.inc includelib \masm32\lib\kernel32.lib .data .data? mybuffer byte 100 dup(?) .code start: mov eax, 0 cpuid invoke lstrcpy, addr mybuffer, ebx invoke lstrcat, addr mybuffer, ecx invoke lstrcat, addr mybuffer, edx invoke GetStdHandle, STD_OUTPUT_HANDLE

Concatenating strings from registers and printing them

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asm in c++ error

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问题 I'm trying to read the cpuid information with the following cod but it doesn't work. I'm using Visual Studio 2010: #include "stdafx.h" #include <stdio.h> int main() { int a, b; for (a = 0; a < 5; a++) { __asm__("cpuid" :"=a"(b) // EAX into b (output) :"0"(a) // a into EAX (input) :"%ebx","%ecx","%edx"); // clobbered registers printf("The code %i gives %i\n", a, b); } return 0; } This is what it say: 'project_scs.exe': Loaded 'C:\Users\rares992\Documents\Visual Studio 2010\Projects\project_scs

CPUID型号06_5EH的常用SSE指令的耗时与冷却

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 摘录自Intel® 64 and IA-32 Architectures Optimization Reference Manual，September 2019 CPUID仅限skyl 功能指令耗时冷却 ---------------------------------------------------------------- 128位复制 movdqa xmm,xmm 1 0.25 ---------------------------------------------------------------- 64位复制 movq xmm,xmm 1 0.33 32位加法 paddd xmm,xmm 1 0.33 32位减法 psubd xmm,xmm 1 0.33 按位与 pand xmm,xmm 1 0.33 按位与非 pandn xmm,xmm 1 0.33 按位或 por xmm,xmm 1 0.33 按位异或 pxor xmm,xmm 1 0.33 ---------------------------------------------------------------- 32位重排 pshufd imm,xmm,xmm 1 1 左移字节 pslldq imm,xmm 1 1

How to ensure that RDTSC is accurate?

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问题 I've read that RDTSC can gives false readings and should not be relied upon. Is this true and if so what can be done about it? 回答1: Very old CPU's have a RDTSC that is accurate. The problem However newer CPU's have a problem. Engineers decided that RDTSC would be great for telling time. However if a CPU throttles the frequency RDTSC is useless for telling time. The aforementioned braindead engineers then decided to 'fix' this problem by having the TSC always run at the same frequency, even if

Why does Hyper-threading get reported as supported on processors without it?

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问题 I'm trying to gather system information and noticed the following on an Intel Xeon E5420: After executing CPUID(EAX=1) , EDX[28] is set, indicating Hyper-threading support, despite the fact that the processor is listed on the Intel website as not supporting Hyper-threading (ark.intel.com) Does anyone have an explanation for this? 回答1: Here's the definition of that bit according to the Intel Developer's Manual: Max APIC IDs reserved field is Valid. A value of 0 for HTT indicates there is only

How to check if a CPU supports the SSE3 instruction set?

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问题 Is the following code valid to check if a CPU supports the SSE3 instruction set? Using the IsProcessorFeaturePresent() function apparently does not work on Windows XP (see http://msdn.microsoft.com/en-us/library/ms724482(v=vs.85).aspx). bool CheckSSE3() { int CPUInfo[4] = {-1}; //-- Get number of valid info ids __cpuid(CPUInfo, 0); int nIds = CPUInfo[0]; //-- Get info for id "1" if (nIds >= 1) { __cpuid(CPUInfo, 1); bool bSSE3NewInstructions = (CPUInfo[2] & 0x1) || false; return

Understanding TLB from CPUID results on Intel

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问题 I'm exploring leaf 0x02 of the cpuid instruction and came up with a few questions. There is a table in the documentation which describes what cpuid results mean for the TLB configuration. Here they are: case 1 56H TLB Data TLB0: 4 MByte pages, 4-way set associative, 16 entries [...] B4H TLB Data TLB1: 4 KByte pages, 4-way associative, 256 entries Does it mean that there are only 2 levels of TLB? How to query the number of levels of TLB cache in case some x86 vendor decides to provide 3 levels

Is there something like x86 cpuid() available for PowerPC?

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问题 I'd like to write some C code be able to query processor attributes on PowerPC, much like one can do with cpuid on x86. I'm after things like brand, model, stepping, SIMD width, available operations, so that there can be run-time confirmation that the code is being used on a compatible platform before something blows up. Is there a general mechanism for doing this on PowerPC? If so, where can one read about it? 回答1: Note that PowerPC has not dozens of extensions / features like x86. It is