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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Kernel interface for the s390 arch_random_* functions
*
* Copyright IBM Corp. 2017
*
* Author: Harald Freudenberger <freude@de.ibm.com>
*
*/
#ifndef _ASM_S390_ARCHRANDOM_H
#define _ASM_S390_ARCHRANDOM_H
#ifdef CONFIG_ARCH_RANDOM
#include <linux/static_key.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 void s390_arch_random_generate(u8 *buf, unsigned int nbytes)
{
cpacf_trng(NULL, 0, buf, nbytes);
atomic64_add(nbytes, &s390_arch_random_counter);
}
static inline bool arch_has_random(void)
{
return false;
}
static inline bool arch_has_random_seed(void)
{
if (static_branch_likely(&s390_arch_random_available))
return true;
return false;
}
static inline bool arch_get_random_long(unsigned long *v)
{
return false;
}
static inline bool arch_get_random_int(unsigned int *v)
{
return false;
}
static inline bool arch_get_random_seed_long(unsigned long *v)
{
if (static_branch_likely(&s390_arch_random_available)) {
s390_arch_random_generate((u8 *)v, sizeof(*v));
return true;
}
return false;
}
static inline bool arch_get_random_seed_int(unsigned int *v)
{
if (static_branch_likely(&s390_arch_random_available)) {
s390_arch_random_generate((u8 *)v, sizeof(*v));
return true;
}
return false;
}
#endif /* CONFIG_ARCH_RANDOM */
#endif /* _ASM_S390_ARCHRANDOM_H */
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