LXR linux/arch/s390/include/asm/archrandom.h

   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
  19DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
  20extern atomic64_t s390_arch_random_counter;
  21
  22bool s390_arch_random_generate(u8 *buf, unsigned int nbytes);
  23
  24static inline bool arch_has_random(void)
  25{
  26        return false;
  27}
  28
  29static 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
  36static inline bool arch_get_random_long(unsigned long *v)
  37{
  38        return false;
  39}
  40
  41static inline bool arch_get_random_int(unsigned int *v)
  42{
  43        return false;
  44}
  45
  46static 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
  54static 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