1 #include <sys/types.h> 2 #include <unistd.h> 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <string.h> 6 7 #include "../../util/header.h" 8 9 static inline void 10 cpuid(unsigned int op, unsigned int *a, unsigned int *b, unsigned int *c, 11 unsigned int *d) 12 { 13 __asm__ __volatile__ (".byte 0x53\n\tcpuid\n\t" 14 "movl %%ebx, %%esi\n\t.byte 0x5b" 15 : "=a" (*a), 16 "=S" (*b), 17 "=c" (*c), 18 "=d" (*d) 19 : "a" (op)); 20 } 21 22 int 23 get_cpuid(char *buffer, size_t sz) 24 { 25 unsigned int a, b, c, d, lvl; 26 int family = -1, model = -1, step = -1; 27 int nb; 28 char vendor[16]; 29 30 cpuid(0, &lvl, &b, &c, &d); 31 strncpy(&vendor[0], (char *)(&b), 4); 32 strncpy(&vendor[4], (char *)(&d), 4); 33 strncpy(&vendor[8], (char *)(&c), 4); 34 vendor[12] = '\0'; 35 36 if (lvl >= 1) { 37 cpuid(1, &a, &b, &c, &d); 38 39 family = (a >> 8) & 0xf; /* bits 11 - 8 */ 40 model = (a >> 4) & 0xf; /* Bits 7 - 4 */ 41 step = a & 0xf; 42 43 /* extended family */ 44 if (family == 0xf) 45 family += (a >> 20) & 0xff; 46 47 /* extended model */ 48 if (family >= 0x6) 49 model += ((a >> 16) & 0xf) << 4; 50 } 51 nb = scnprintf(buffer, sz, "%s,%u,%u,%u$", vendor, family, model, step); 52 53 /* look for end marker to ensure the entire data fit */ 54 if (strchr(buffer, '$')) { 55 buffer[nb-1] = '\0'; 56 return 0; 57 } 58 return -1; 59 } 60
