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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 <regex.h>
#include "../../util/debug.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-%X$") < 0) {
free(buf);
return NULL;
}
return buf;
}
/* Full CPUID format for x86 is vendor-family-model-stepping */
static bool is_full_cpuid(const char *id)
{
const char *tmp = id;
int count = 0;
while ((tmp = strchr(tmp, '-')) != NULL) {
count++;
tmp++;
}
if (count == 3)
return true;
return false;
}
int strcmp_cpuid_str(const char *mapcpuid, const char *id)
{
regex_t re;
regmatch_t pmatch[1];
int match;
bool full_mapcpuid = is_full_cpuid(mapcpuid);
bool full_cpuid = is_full_cpuid(id);
/*
* Full CPUID format is required to identify a platform.
* Error out if the cpuid string is incomplete.
*/
if (full_mapcpuid && !full_cpuid) {
pr_info("Invalid CPUID %s. Full CPUID is required, "
"vendor-family-model-stepping\n", id);
return 1;
}
if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
/* Warn unable to generate match particular string. */
pr_info("Invalid regular expression %s\n", mapcpuid);
return 1;
}
match = !regexec(&re, id, 1, pmatch, 0);
regfree(&re);
if (match) {
size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
size_t cpuid_len;
/* If the full CPUID format isn't required,
* ignoring the stepping.
*/
if (!full_mapcpuid && full_cpuid)
cpuid_len = strrchr(id, '-') - id;
else
cpuid_len = strlen(id);
/* Verify the entire string matched. */
if (match_len == cpuid_len)
return 0;
}
return 1;
}
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