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| // SPDX-License-Identifier: GPL-2.0
| #include <sys/types.h>
| #include <errno.h>
| #include <unistd.h>
| #include <stdio.h>
| #include <stdlib.h>
| #include <string.h>
|
| #include "../../util/header.h"
|
| static inline void
| cpuid(unsigned int op, unsigned int *a, unsigned int *b, unsigned int *c,
| unsigned int *d)
| {
| __asm__ __volatile__ (".byte 0x53\n\tcpuid\n\t"
| "movl %%ebx, %%esi\n\t.byte 0x5b"
| : "=a" (*a),
| "=S" (*b),
| "=c" (*c),
| "=d" (*d)
| : "a" (op));
| }
|
| static int
| __get_cpuid(char *buffer, size_t sz, const char *fmt)
| {
| unsigned int a, b, c, d, lvl;
| int family = -1, model = -1, step = -1;
| int nb;
| char vendor[16];
|
| cpuid(0, &lvl, &b, &c, &d);
| strncpy(&vendor[0], (char *)(&b), 4);
| strncpy(&vendor[4], (char *)(&d), 4);
| strncpy(&vendor[8], (char *)(&c), 4);
| vendor[12] = '\0';
|
| if (lvl >= 1) {
| cpuid(1, &a, &b, &c, &d);
|
| family = (a >> 8) & 0xf; /* bits 11 - 8 */
| model = (a >> 4) & 0xf; /* Bits 7 - 4 */
| step = a & 0xf;
|
| /* extended family */
| if (family == 0xf)
| family += (a >> 20) & 0xff;
|
| /* extended model */
| if (family >= 0x6)
| model += ((a >> 16) & 0xf) << 4;
| }
| nb = scnprintf(buffer, sz, fmt, vendor, family, model, step);
|
| /* look for end marker to ensure the entire data fit */
| if (strchr(buffer, '$')) {
| buffer[nb-1] = '\0';
| return 0;
| }
| return ENOBUFS;
| }
|
| int
| get_cpuid(char *buffer, size_t sz)
| {
| return __get_cpuid(buffer, sz, "%s,%u,%u,%u$");
| }
|
| char *
| get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
| {
| char *buf = malloc(128);
|
| if (buf && __get_cpuid(buf, 128, "%s-%u-%X$") < 0) {
| free(buf);
| return NULL;
| }
| return buf;
| }
|
|
