1 /* SPDX-License-Identifier: GPL-2.0 */ 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 19 DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); 20 extern atomic64_t s390_arch_random_counter; 21 22 bool s390_arch_random_generate(u8 *buf, unsigned int nbytes); 23 24 static inline bool __must_check arch_get_random_long(unsigned long *v) 25 { 26 return false; 27 } 28 29 static inline bool __must_check arch_get_random_int(unsigned int *v) 30 { 31 return false; 32 } 33 34 static inline bool __must_check arch_get_random_seed_long(unsigned long *v) 35 { 36 if (static_branch_likely(&s390_arch_random_available)) { 37 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 38 } 39 return false; 40 } 41 42 static inline bool __must_check arch_get_random_seed_int(unsigned int *v) 43 { 44 if (static_branch_likely(&s390_arch_random_available)) { 45 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 46 } 47 return false; 48 } 49 50 #endif /* CONFIG_ARCH_RANDOM */ 51 #endif /* _ASM_S390_ARCHRANDOM_H */ 52