1 // SPDX-License-Identifier: GPL-2.0 2 #include <sys/types.h> 3 #include <unistd.h> 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <string.h> 7 8 #include "../../util/header.h" 9 10 static inline void 11 cpuid(unsigned int op, unsigned int *a, unsigned int *b, unsigned int *c, 12 unsigned int *d) 13 { 14 __asm__ __volatile__ (".byte 0x53\n\tcpuid\n\t" 15 "movl %%ebx, %%esi\n\t.byte 0x5b" 16 : "=a" (*a), 17 "=S" (*b), 18 "=c" (*c), 19 "=d" (*d) 20 : "a" (op)); 21 } 22 23 static int 24 __get_cpuid(char *buffer, size_t sz, const char *fmt) 25 { 26 unsigned int a, b, c, d, lvl; 27 int family = -1, model = -1, step = -1; 28 int nb; 29 char vendor[16]; 30 31 cpuid(0, &lvl, &b, &c, &d); 32 strncpy(&vendor[0], (char *)(&b), 4); 33 strncpy(&vendor[4], (char *)(&d), 4); 34 strncpy(&vendor[8], (char *)(&c), 4); 35 vendor[12] = '\0'; 36 37 if (lvl >= 1) { 38 cpuid(1, &a, &b, &c, &d); 39 40 family = (a >> 8) & 0xf; /* bits 11 - 8 */ 41 model = (a >> 4) & 0xf; /* Bits 7 - 4 */ 42 step = a & 0xf; 43 44 /* extended family */ 45 if (family == 0xf) 46 family += (a >> 20) & 0xff; 47 48 /* extended model */ 49 if (family >= 0x6) 50 model += ((a >> 16) & 0xf) << 4; 51 } 52 nb = scnprintf(buffer, sz, fmt, vendor, family, model, step); 53 54 /* look for end marker to ensure the entire data fit */ 55 if (strchr(buffer, '$')) { 56 buffer[nb-1] = '\0'; 57 return 0; 58 } 59 return -1; 60 } 61 62 int 63 get_cpuid(char *buffer, size_t sz) 64 { 65 return __get_cpuid(buffer, sz, "%s,%u,%u,%u$"); 66 } 67 68 char * 69 get_cpuid_str(struct perf_pmu *pmu __maybe_unused) 70 { 71 char *buf = malloc(128); 72 73 if (buf && __get_cpuid(buf, 128, "%s-%u-%X$") < 0) { 74 free(buf); 75 return NULL; 76 } 77 return buf; 78 } 79