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Time Stamp Counter

The Time Stamp Counter (TSC) is a 64-bit register present on all x86 processors since the Pentium. It counts the number of CPU cycles since its reset. The instruction RDTSC returns the TSC in EDX:EAX. In x86-64 mode, RDTSC also clears the upper 32 bits of RAX and RDX. Its opcode is 0F 31. Pentium competitors such as the Cyrix 6x86 did not always have a…

Applications & Measurement

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Use

Multi-coreHyper-threadedMultiple CPUsHibernatingOperating systems
13 related topics

Implementation in various processors

Pentium MIntel XeonPentium 4Intel Core SoloIntel Core Duo
11 related topics

Other architectures

AVR32SPARC V9PowerPCARMv7ARMv8-A
5 related topics

Overview

64-bitRegisterX86PentiumCPU
14 related topics

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Overview

Use

Implementation in various processors

Operating system use

Use in exploiting cache side-channel attacks

  • Meltdown Meltdown (security vulnerability)
  • Spectre Spectre (security vulnerability)
  • ARM ARM architecture

Other architectures

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Time Stamp Counter

Nodes55
Edges54
Triples23
Avg. degree1.96
Density0.036364
Components1

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Time Stamp Counter

Top relations

related to Use · 16
Time Stamp Counter → BIOS, CPU, CPUs, Even, FreeBSD, Hence TSC, In, Linux's/proc/cpuinfo, OS, Recent Intel, Relying, The Time Stamp Counter, There, Therefore, TSC, With
related to Use in exploiting cache side-channel attacks · 5
Time Stamp Counter → ARM, However, Meltdown, Spectre, The

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Important terminology

tsc processors counter clock processor cpu may time pentium program system also intel frequency cycle stamp constant since cyrix register

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
the Cyrix 6x86 did not always have a TSCinstance ofPentium competitors0.80text
may considerRDTSCan illegal instructioninstance ofPentium competitors0.80text
Time Stamp Counterrelated to UseThe Time Stamp Counter0.60section
Time Stamp Counterrelated to UseCPU0.60section
Time Stamp Counterrelated to UseWith0.60section
Time Stamp Counterrelated to UseCPUs0.60section
Time Stamp Counterrelated to UseTSC0.60section
Time Stamp Counterrelated to UseThere0.60section
Time Stamp Counterrelated to UseTherefore0.60section
Time Stamp Counterrelated to UseEven0.60section
Time Stamp Counterrelated to UseOS0.60section
Time Stamp Counterrelated to UseBIOS0.60section

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    Min side: 3
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