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javawindowsjnacpuid

Using JNA to call the __cpuid function on Windows

I need to get processor information (vendor, model, etc.) in Java. I would normally use C/C++ but unfortunately this has to be done in Java for my current project. I am using JNA for native access, and I've declared my JNA Library as follows:

public interface CLibrary extends Library {
    public void __cpuid(int[] CPUInfo, int InfoType);
}

I'm attempting to make the call like this:

CLibrary c = (CLibrary) Native.loadLibrary("msvcrt", CLibrary.class);
int[] CPUInfo = new int[4];
c.__cpuid(CPUInfo, 0);

However I'm getting Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'intrin': The specified module could not be found. which probably means I'm loading the wrong library.

So what is the library I need to load to get access to the __cpuid function on Windows?

Solution

  • As __cpuid is a compiler instrinsic (see MSDN) rather than a function, there is no associated DLL. You'll need to write your own.