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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
4c637cd8 HF |
2 | /* |
3 | * Kernel interface for the s390 arch_random_* functions | |
4 | * | |
5 | * Copyright IBM Corp. 2017 | |
6 | * | |
7 | * Author: Harald Freudenberger <freude@de.ibm.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #ifndef _ASM_S390_ARCHRANDOM_H | |
12 | #define _ASM_S390_ARCHRANDOM_H | |
13 | ||
14 | #ifdef CONFIG_ARCH_RANDOM | |
15 | ||
16 | #include <linux/static_key.h> | |
17 | #include <linux/atomic.h> | |
18 | #include <asm/cpacf.h> | |
19 | ||
20 | DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); | |
21 | extern atomic64_t s390_arch_random_counter; | |
22 | ||
23 | static void s390_arch_random_generate(u8 *buf, unsigned int nbytes) | |
24 | { | |
25 | cpacf_trng(NULL, 0, buf, nbytes); | |
26 | atomic64_add(nbytes, &s390_arch_random_counter); | |
27 | } | |
28 | ||
29 | static inline bool arch_has_random(void) | |
30 | { | |
31 | if (static_branch_likely(&s390_arch_random_available)) | |
32 | return true; | |
33 | return false; | |
34 | } | |
35 | ||
36 | static inline bool arch_has_random_seed(void) | |
37 | { | |
38 | return arch_has_random(); | |
39 | } | |
40 | ||
41 | static inline bool arch_get_random_long(unsigned long *v) | |
42 | { | |
43 | if (static_branch_likely(&s390_arch_random_available)) { | |
44 | s390_arch_random_generate((u8 *)v, sizeof(*v)); | |
45 | return true; | |
46 | } | |
47 | return false; | |
48 | } | |
49 | ||
50 | static inline bool arch_get_random_int(unsigned int *v) | |
51 | { | |
52 | if (static_branch_likely(&s390_arch_random_available)) { | |
53 | s390_arch_random_generate((u8 *)v, sizeof(*v)); | |
54 | return true; | |
55 | } | |
56 | return false; | |
57 | } | |
58 | ||
59 | static inline bool arch_get_random_seed_long(unsigned long *v) | |
60 | { | |
61 | return arch_get_random_long(v); | |
62 | } | |
63 | ||
64 | static inline bool arch_get_random_seed_int(unsigned int *v) | |
65 | { | |
66 | return arch_get_random_int(v); | |
67 | } | |
68 | ||
69 | #endif /* CONFIG_ARCH_RANDOM */ | |
70 | #endif /* _ASM_S390_ARCHRANDOM_H */ |