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 20 int 21 get_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 } 37