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
  18 int
  19 get_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 }