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 8 #define mfspr(rn) ({unsigned long rval; \ 9 asm volatile("mfspr %0," __stringify(rn) \ 10 : "=r" (rval)); rval; }) 11 12 #define SPRN_PVR 0x11F /* Processor Version Register */ 13 #define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */ 14 #define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */ 15 16 int 17 get_cpuid(char *buffer, size_t sz) 18 { 19 unsigned long pvr; 20 int nb; 21 22 pvr = mfspr(SPRN_PVR); 23 24 nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr)); 25 26 /* look for end marker to ensure the entire data fit */ 27 if (strchr(buffer, '$')) { 28 buffer[nb-1] = '\0'; 29 return 0; 30 } 31 return -1; 32 } 33