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
20int
21get_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}
37