A library to parse the x86 CPUID instruction, written in rust with no external dependencies. The implementation closely resembles the Intel CPUID manual description. The library works in no_std environments. Some additional cargo features require std (e.g., pretty printing, serialization).

• For Intel platforms: The code should be in sync with the March 2018 revision of the Intel Architectures SDM.
• For AMD platforms it should be in sync with the AMD64 systems manual no. 24594, Revision 3.32 (March 2021).

use raw_cpuid::CpuId;
let cpuid = CpuId::new();

if let Some(vf) = cpuid.get_vendor_info() {
    assert!(vf.as_str() == "GenuineIntel" || vf.as_str() == "AuthenticAMD");
}

let has_sse = cpuid.get_feature_info().map_or(false, |finfo| finfo.has_sse());
if has_sse {
    println!("CPU supports SSE!");
}

if let Some(cparams) = cpuid.get_cache_parameters() {
    for cache in cparams {
        let size = cache.associativity() * cache.physical_line_partitions() * cache.coherency_line_size() * cache.sets();
        println!("L{}-Cache size is {}", cache.level(), size);
    }
} else {
    println!("No cache parameter information available")
}

raw-cpuid ships with a cpuid binary that can be installed to inspect the output of the CPUID instruction on a host system.

To install, use:

cargo install raw-cpuid --features cli

The cli feature is currently required to build the binary version due to cargo limitations.

• API Documentation
• Examples