1.cpp

#include <stdio.h>
#include <vector>
#include <algorithm>

const char L[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

void pr_hex(int i, int k = 0)
{
    if (k == 16) return;
    pr_hex(i / 16, k + 1);
    printf("%c", L[i % 16]);
    if (!(k % 4)) printf(" ");
}

short count;
int arr[4];
int a, b, c, d;

int main()
{
    count = 4;
    for (int i = 0; i < count; ++i)
    {
        asm volatile(
            "movl $0x4, %%eax; \n"
            "cpuid;"
            :"=a"(a), "=b"(b), "=c"(c), "=d"(d)
            :"c"(i)
            :
            );
        printf("%d", count);
        // 0    0000
        // 1    0001
        // 2    0010
        // 3    0011
        // 4    0100
        // 5    0101
        // 6    0110
        // 8    0111
        // 9    1000
        // 10   1001
        // a    1010
        // b    1011
        // c    1100
        // d    1101
        // e    1110
        // f    1111
        //1111 1111 1100 0000 0000 0000 0000 0000;
        int m1 = 0xffc00000;
        //0000 0000 0011 1111 1111 0000 0000 0000;
        int m2 = 0x003ff000;
        //0000 0000 0000 0000 0000 1111 1111 1111;
        int m3 = 0x00000fff;
        printf("%d", (b & m1 + 1)*(b & m2 + 1)*(b & m3)*(c + 1)); 

        printf("\n");
    }

    return 0;    

    count = 1;
    for (int i = 0; i < count; ++i)
    {
        asm volatile(
            "movl $2, %eax;"
            "cpuid;"
            "movb %al, (_count);"
            "movl %eax, (_a);"
            "movl %ebx, (_a + 1);"
            "movl %ecx, (_a + 2);"
            "movl %edx, (_a + 3);"
            );
        for (int i = 0; i < 4; ++i)
        {
            pr_hex(arr[i]);
            printf("\n");
        }
    }
    return 0;
}