xref: /OK3568_Linux_fs/kernel/arch/s390/crypto/arch_random.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * s390 arch random implementation.
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright IBM Corp. 2017, 2020
6*4882a593Smuzhiyun  * Author(s): Harald Freudenberger
7*4882a593Smuzhiyun  */
8*4882a593Smuzhiyun 
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/atomic.h>
11*4882a593Smuzhiyun #include <linux/random.h>
12*4882a593Smuzhiyun #include <linux/static_key.h>
13*4882a593Smuzhiyun #include <asm/cpacf.h>
14*4882a593Smuzhiyun 
15*4882a593Smuzhiyun DEFINE_STATIC_KEY_FALSE(s390_arch_random_available);
16*4882a593Smuzhiyun 
17*4882a593Smuzhiyun atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0);
18*4882a593Smuzhiyun EXPORT_SYMBOL(s390_arch_random_counter);
19