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 arch_has_random(void) 25 { 26 return false; 27 } 28 29 static inline bool arch_has_random_seed(void) 30 { 31 if (static_branch_likely(&s390_arch_random_available)) 32 return true; 33 return false; 34 } 35 36 static inline bool arch_get_random_long(unsigned long *v) 37 { 38 return false; 39 } 40 41 static inline bool arch_get_random_int(unsigned int *v) 42 { 43 return false; 44 } 45 46 static inline bool arch_get_random_seed_long(unsigned long *v) 47 { 48 if (static_branch_likely(&s390_arch_random_available)) { 49 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 50 } 51 return false; 52 } 53 54 static inline bool arch_get_random_seed_int(unsigned int *v) 55 { 56 if (static_branch_likely(&s390_arch_random_available)) { 57 return s390_arch_random_generate((u8 *)v, sizeof(*v)); 58 } 59 return false; 60 } 61 62 #endif /* CONFIG_ARCH_RANDOM */ 63 #endif /* _ASM_S390_ARCHRANDOM_H */ 64