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
get_cpuid(char * buffer,size_t sz)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 }
35
36 char *
get_cpuid_str(void)37 get_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