mirror of https://gitee.com/openkylin/linux.git
29 lines
712 B
C
29 lines
712 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* s390 arch random implementation.
|
|
*
|
|
* Copyright IBM Corp. 2017
|
|
* Author(s): Harald Freudenberger <freude@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/random.h>
|
|
#include <linux/static_key.h>
|
|
#include <asm/cpacf.h>
|
|
|
|
DEFINE_STATIC_KEY_FALSE(s390_arch_random_available);
|
|
|
|
atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0);
|
|
EXPORT_SYMBOL(s390_arch_random_counter);
|
|
|
|
static int __init s390_arch_random_init(void)
|
|
{
|
|
/* check if subfunction CPACF_PRNO_TRNG is available */
|
|
if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
|
|
static_branch_enable(&s390_arch_random_available);
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(s390_arch_random_init);
|