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#include "../../util/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