projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |