C#中的x86/x64 CPUID

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("kernel32.dll")]
    public static extern void GetSystemInfo(out SYSTEM_INFO lpSystemInfo);

    [StructLayout(LayoutKind.Sequential)]
    public struct SYSTEM_INFO
    {
        public ushort processorArchitecture;
        public ushort reserved;
        public uint pageSize;
        public IntPtr minimumApplicationAddress;
        public IntPtr maximumApplicationAddress;
        public IntPtr activeProcessorMask;
        public uint numberOfProcessors;
        public uint processorType;
        public uint allocationGranularity;
        public ushort processorLevel;
        public ushort processorRevision;
    }

    [DllImport("kernel32.dll")]
    public static extern void __cpuid(int[] cpuInfo, int infoType);

    static void Main(string[] args)
    {
        // 获取系统信息
        SYSTEM_INFO sysInfo;
        GetSystemInfo(out sysInfo);

        Console.WriteLine("Processor Architecture: {0}", sysInfo.processorArchitecture == 0 ? "x86" : "x64");

        // 执行CPUID指令
        int[] cpuInfo = new int[4];
        __cpuid(cpuInfo, 0);

        int maxFunction = cpuInfo[0];
        Console.WriteLine("Max CPUID Function: {0}", maxFunction);

        // 获取制造商信息
        __cpuid(cpuInfo, 0x80000002);
        string manufacturer = GetStringFromRegisters(cpuInfo);
        Console.WriteLine("Manufacturer: {0}", manufacturer);

        // 获取处理器型号信息
        __cpuid(cpuInfo, 0x80000003);
        string processorNamePart1 = GetStringFromRegisters(cpuInfo);

        __cpuid(cpuInfo, 0x80000004);
        string processorNamePart2 = GetStringFromRegisters(cpuInfo);

        string processorName = processorNamePart1 + processorNamePart2;
        Console.WriteLine("Processor Name: {0}", processorName);

        // 其他CPUID信息获取，可以根据需要执行不同的CPUID指令

        Console.ReadLine();
    }

    static string GetStringFromRegisters(int[] registers)
    {
        string str = "";
        for (int i = 0; i < registers.Length; i++)
        {
            str += (char)(registers[i] & 0xFF);
            str += (char)((registers[i] >> 8) & 0xFF);
            str += (char)((registers[i] >> 16) & 0xFF);
            str += (char)((registers[i] >> 24) & 0xFF);
        }
        return str.TrimEnd('\0');
    }
}