Linux Perf
header.c
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// SPDX-License-Identifier: GPL-2.0
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../../util/header.h"
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static
inline
void
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cpuid
(
unsigned
int
op,
unsigned
int
*a,
unsigned
int
*b,
unsigned
int
*c,
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unsigned
int
*d)
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{
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__asm__ __volatile__ (
".byte 0x53\n\tcpuid\n\t"
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"movl %%ebx, %%esi\n\t.byte 0x5b"
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:
"=a"
(*a),
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"=S"
(*b),
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"=c"
(*c),
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"=d"
(*d)
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:
"a"
(op));
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}
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static
int
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__get_cpuid
(
char
*buffer,
size_t
sz,
const
char
*
fmt
)
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{
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unsigned
int
a, b, c, d, lvl;
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int
family = -1, model = -1, step = -1;
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int
nb;
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char
vendor[16];
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cpuid
(0, &lvl, &b, &c, &d);
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strncpy(&vendor[0], (
char
*)(&b), 4);
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strncpy(&vendor[4], (
char
*)(&d), 4);
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strncpy(&vendor[8], (
char
*)(&c), 4);
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vendor[12] =
'\0'
;
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if
(lvl >= 1) {
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cpuid
(1, &a, &b, &c, &d);
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family = (a >> 8) & 0xf;
/* bits 11 - 8 */
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model = (a >> 4) & 0xf;
/* Bits 7 - 4 */
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step = a & 0xf;
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/* extended family */
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if
(family == 0xf)
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family += (a >> 20) & 0xff;
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/* extended model */
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if
(family >= 0x6)
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model += ((a >> 16) & 0xf) << 4;
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}
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nb = scnprintf(buffer, sz, fmt, vendor, family, model, step);
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/* look for end marker to ensure the entire data fit */
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if
(strchr(buffer,
'$'
)) {
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buffer[nb-1] =
'\0'
;
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return
0;
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}
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return
-1;
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}
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int
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get_cpuid
(
char
*buffer,
size_t
sz)
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{
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return
__get_cpuid
(buffer, sz,
"%s,%u,%u,%u$"
);
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}
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char
*
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get_cpuid_str
(
struct
perf_pmu
*pmu __maybe_unused)
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{
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char
*buf =
malloc
(128);
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if
(buf &&
__get_cpuid
(buf, 128,
"%s-%u-%X$"
) < 0) {
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free
(buf);
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return
NULL;
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}
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return
buf;
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}
get_cpuid
int get_cpuid(char *buffer, size_t sz)
Definition:
header.c:20
get_cpuid_str
char * get_cpuid_str(struct perf_pmu *pmu)
Definition:
header.c:12
perf_pmu
Definition:
pmu.h:22
malloc
void * malloc(YYSIZE_T)
fmt
const char * fmt
Definition:
dso.c:193
__get_cpuid
static int __get_cpuid(char *buffer, size_t sz, const char *fmt)
Definition:
header.c:24
cpuid
static void cpuid(unsigned int op, unsigned int *a, unsigned int *b, unsigned int *c, unsigned int *d)
Definition:
header.c:11
free
void free(void *)
arch
x86
util
header.c
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