39 lines
947 B
C
39 lines
947 B
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Kernel interface for the s390 arch_random_* functions
|
||
|
|
*
|
||
|
|
* Copyright IBM Corp. 2017, 2022
|
||
|
|
*
|
||
|
|
* Author: Harald Freudenberger <freude@de.ibm.com>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _ASM_S390_ARCHRANDOM_H
|
||
|
|
#define _ASM_S390_ARCHRANDOM_H
|
||
|
|
|
||
|
|
#include <linux/static_key.h>
|
||
|
|
#include <linux/preempt.h>
|
||
|
|
#include <linux/atomic.h>
|
||
|
|
#include <asm/cpacf.h>
|
||
|
|
|
||
|
|
DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
|
||
|
|
extern atomic64_t s390_arch_random_counter;
|
||
|
|
|
||
|
|
static inline size_t __must_check arch_get_random_longs(unsigned long *v, size_t max_longs)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
|
||
|
|
{
|
||
|
|
if (static_branch_likely(&s390_arch_random_available) &&
|
||
|
|
in_task()) {
|
||
|
|
cpacf_trng(NULL, 0, (u8 *)v, max_longs * sizeof(*v));
|
||
|
|
atomic64_add(max_longs * sizeof(*v), &s390_arch_random_counter);
|
||
|
|
return max_longs;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _ASM_S390_ARCHRANDOM_H */
|