How do I Access CPU Information in Linux Using \'cpuid\'?

Accessing CPU Information in Linux Using "cpuid"

In Linux, the CPUInfo functionality is accessible through the "cpuid" instruction. However, to leverage this instruction effectively, you need to understand its implementation and potential alternatives.

In your code snippet, you attempted to use the "_cpuinfo()" function from the Windows API, which is not compatible with Linux. Instead, Linux provides the "cpuid.h" header that allows you to access the "cpuid" instruction through the following functions:

• __get_cpuid_max: Retrieves the highest supported input value for the "cpuid" instruction, either for basic or extended information.
• __get_cpuid: Returns CPUID data for a specific level and stores it in the provided pointers.

These functions provide a convenient way to retrieve CPU information without the need for assembly code. Here's an example of how you can use these functions:

<code class="c++">#include <cpuid.h>
 
int main()
{
  unsigned int eax, ebx, ecx, edx;
 
  // Get the highest supported CPUID level
  unsigned int max_level = __get_cpuid_max(0, NULL);
 
  // Iterate over the supported levels
  for (unsigned int level = 0; level <= max_level; level++)
  {
    // Get the CPUID data for the current level
    if (__get_cpuid(level, &eax, &ebx, &ecx, &edx))
    {
      // Display the data
      std::cout << "CPUInfo at level " << level << ":\n";
      std::cout << "EAX: " << eax << "\n";
      std::cout << "EBX: " << ebx << "\n";
      std::cout << "ECX: " << ecx << "\n";
      std::cout << "EDX: " << edx << "\n";
    }
  }
 
  return 0;
}</code>

By using the "cpuid.h" header and these functions, you can efficiently access and utilize the "cpuid" instruction in a Linux environment without the need for re-implemented functionality.

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