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 #include "header.h" 8 #include "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 18 int 19 get_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