Linux Kernel  3.7.1
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header.c
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1 #include <sys/types.h>
2 #include <unistd.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6 
7 #include "../../util/header.h"
8 
9 #define __stringify_1(x) #x
10 #define __stringify(x) __stringify_1(x)
11 
12 #define mfspr(rn) ({unsigned long rval; \
13  asm volatile("mfspr %0," __stringify(rn) \
14  : "=r" (rval)); rval; })
15 
16 #define SPRN_PVR 0x11F /* Processor Version Register */
17 #define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */
18 #define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */
19 
20 int
21 get_cpuid(char *buffer, size_t sz)
22 {
23  unsigned long pvr;
24  int nb;
25 
26  pvr = mfspr(SPRN_PVR);
27 
28  nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));
29 
30  /* look for end marker to ensure the entire data fit */
31  if (strchr(buffer, '$')) {
32  buffer[nb-1] = '\0';
33  return 0;
34  }
35  return -1;
36 }