LXR linux/tools/perf/arch/powerpc/util/header.c

   1#include <sys/types.h>
   2#include <unistd.h>
   3#include <stdio.h>
   4#include <stdlib.h>
   5#include <string.h>
   6#include <linux/stringify.h>
   7#include "header.h"
   8#include "util.h"
   9
  10#define mfspr(rn)       ({unsigned long rval; \
  11                         asm volatile("mfspr %0," __stringify(rn) \
  12                                      : "=r" (rval)); rval; })
  13
  14#define SPRN_PVR        0x11F   /* Processor Version Register */
  15#define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
  16#define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
  17
  18int
  19get_cpuid(char *buffer, size_t sz)
  20{
  21        unsigned long pvr;
  22        int nb;
  23
  24        pvr = mfspr(SPRN_PVR);
  25
  26        nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
  27
  28        /* look for end marker to ensure the entire data fit */
  29        if (strchr(buffer, '$')) {
  30                buffer[nb-1] = '\0';
  31                return 0;
  32        }
  33        return -1;
  34}
  35
  36char *
  37get_cpuid_str(void)
  38{
  39        char *bufp;
  40
  41        if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0)
  42                bufp = NULL;
  43
  44        return bufp;
  45}
  46