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