#Proc cpuinfo flags generator
#Proc cpuinfo flags full

#Proc cpuinfo flags generator

rng_en: Random Number Generator enabled.rng: Random Number Generator present (xstore).VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001 rdrand: Read Random Number from hardware random number generator instruction.xsave: Save Processor Extended States: also provides XGETBY, XRSTOR, XSETBY.aes/ aes-ni: Advanced Encryption Standard (New Instructions).popcnt: Return the Count of Number of Bits Set to 1 instruction ( Hamming weight, i.e.movbe: Move Data After Swapping Bytes instruction.vmx: Hardware virtualization: Intel VMX.monitor: Monitor/Mwait support ( Intel SSE3 supplements).pclmulqdq: Perform a Carry-Less Multiplication of Quadword instruction - accelerator for GCM).pni: SSE-3 (“ Prescott New Instructions”).See also Wikipedia and table 2-26 in Intel Advanced Vector Extensions Programming Reference Intel-defined CPU features, CPUID level 0x00000001 (ecx) mce_recovery: CPU has recoverable machine checks.tsc_known_freq: TSC has known frequency.nonstop_tsc_s3: TSC doesn't stop in S3 state.extd_apicid: has extended APICID (8 bits).cpuid: CPU has CPUID instruction itself.nonstop_tsc: TSC does not stop in C states.tsc_reliable: TSC is known to be reliable.xtopology: cpu topology enum extensions.acc_power: AMD accumulated power mechanism.arch_perfmon: Intel Architectural PerfMon.constant_tsc: TSC ticks at a constant rate.Transmeta-defined CPU features, CPUID level 0x80860001 3dnow: 3DNow! (AMD vector instructions, competing with Intel's SSE1).lm: Long Mode ( x86-64: amd64, also known as Intel 64, i.e.rdtscp: Read Time-Stamp Counter and Processor ID.pdpe1gb: One GB pages (allows hugepagesz=1G).syscall: SYSCALL (Fast System Call) and SYSRET (Return From Fast System Call).See also Wikipedia and table 2-23 in Intel Advanced Vector Extensions Programming Reference pbe: Pending Break Enable (PBE# pin) wakeup supportĪMD-defined CPU features, CPUID level 0x80000001.ia64: Intel Itanium Architecture 64-bit (not to be confused with Intel's 64-bit x86 architecture with flag x86-64 or 'AMD64' bit indicated by flag lm).tm: Automatic clock control (Thermal Monitor).acpi: ACPI via MSR (temperature monitoring and clock speed modulation).dts: Debug Store (buffer for debugging and profiling instructions).cmov: CMOV instructions (conditional move) (also FCMOV).

pge: Page Global Enable (global bit in PDEs and PTEs).

cx8: CMPXCHG8 instruction (64-bit compare-and-swap).

pae: Physical Address Extensions (support for more than 4GB of RAM).

msr: Model-Specific Registers (RDMSR, WRMSR).

pse: Page Size Extensions (4MB memory pages).

fpu: Onboard FPU (floating point support).

See also Wikipedia and table 2-27 in Intel Advanced Vector Extensions Programming Reference Intel-defined CPU features, CPUID level 0x00000001 (edx)

#Proc cpuinfo flags full

The full listing is in the kernel source, in the file arch/x86/include/asm/cpufeatures.h. Most of the other features are only of interest to compiler or kernel authors.

a hypervisor (announced as such)? hypervisor.

Hardware virtualization (VMX/AMD-V)? vmx (Intel), svm (AMD).

In other words, your workstation, laptop or server.) FAQ: Do I have… The output above counts how many times the specified flag(s) appear, anything more than 0 indicates you have support.(32-bit a.k.a. Virtualization check: egrep -c '( vmx | svm )' /proc/cpuinfo The easier way (but harder to remember) is to run:Ħ4bit check: egrep -c ' lm ' /proc/cpuinfo If the flags above appear you have support the the respective CPU feature.

Svm - AMD Virtualization - (Secure Virtual Machine) Vmx - Inter Virtualization - (Virtual Machine eXtensions) Lm - 64bit support - (Long Mode - 64bit Extensions, AMD AMD64 or Intel EM64T) the interesting flags which you need to look out for: The line(s) your looking for like something like this:įlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good nopl extd_apicid pni lahf_lm cmp_legacyĭepending on your hardware you may have many flag lines. This might save you some time, the easiest way to determine if a system supports 64bit and virtualization in Linux is to look at the output of: cat /proc/cpuinfo