Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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}