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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 <linux/stringify.h>
#include "header.h"
#define mfspr(rn) ({unsigned long rval; \
asm volatile("mfspr %0," __stringify(rn) \
: "=r" (rval)); rval; })
#define SPRN_PVR 0x11F /* Processor Version Register */
#define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */
#define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */
int
get_cpuid(char *buffer, size_t sz)
{
unsigned long pvr;
int nb;
pvr = mfspr(SPRN_PVR);
nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
/* look for end marker to ensure the entire data fit */
if (strchr(buffer, '$')) {
buffer[nb-1] = '\0';
return 0;
}
return ENOBUFS;
}
char *
get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
char *bufp;
if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0)
bufp = NULL;
return bufp;
}
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