1 // SPDX-License-Identifier: GPL-2.0 2 #include <sys/types.h> 3 #include <unistd.h> 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <string.h> 7 #include <linux/stringify.h> 8 #include "header.h" 9 #include "util.h" 10 11 #define mfspr(rn) ({unsigned long rval; \ 12 asm volatile("mfspr %0," __stringify(rn) \ 13 : "=r" (rval)); rval; }) 14 15 #define SPRN_PVR 0x11F /* Processor Version Register */ 16 #define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */ 17 #define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */ 18 19 int 20 get_cpuid(char *buffer, size_t sz) 21 { 22 unsigned long pvr; 23 int nb; 24 25 pvr = mfspr(SPRN_PVR); 26 27 nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr)); 28 29 /* look for end marker to ensure the entire data fit */ 30 if (strchr(buffer, '$')) { 31 buffer[nb-1] = '\0'; 32 return 0; 33 } 34 return -1; 35 } 36 37 char * 38 get_cpuid_str(void) 39 { 40 char *bufp; 41 42 if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0) 43 bufp = NULL; 44 45 return bufp; 46 } 47