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#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}