80 lines
1.6 KiB
C
Executable file
80 lines
1.6 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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#include <sys/types.h>
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#include <errno.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, '$')) {
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buffer[nb-1] = '\0';
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return 0;
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}
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return ENOBUFS;
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}
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int
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get_cpuid(char *buffer, size_t sz)
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{
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return __get_cpuid(buffer, sz, "%s,%u,%u,%u$");
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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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}
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