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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fbe96f29 SE |
2 | #include <sys/types.h> |
3 | #include <unistd.h> | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
6 | #include <string.h> | |
531d2410 | 7 | #include <linux/stringify.h> |
379649cf SB |
8 | #include "header.h" |
9 | #include "util.h" | |
fbe96f29 SE |
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 | ||
e7f01d1e | 27 | nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr)); |
fbe96f29 SE |
28 | |
29 | /* look for end marker to ensure the entire data fit */ | |
30 | if (strchr(buffer, '$')) { | |
31 | buffer[nb-1] = '\0'; | |
32 | return 0; | |
33 | } | |
34 | return -1; | |
35 | } | |
ce88f27c SB |
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 | } |