cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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archrandom.h (1256B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Kernel interface for the s390 arch_random_* functions
      4 *
      5 * Copyright IBM Corp. 2017, 2020
      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#include <asm/cpacf.h>
     19
     20DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
     21extern atomic64_t s390_arch_random_counter;
     22
     23static inline bool __must_check arch_get_random_long(unsigned long *v)
     24{
     25	return false;
     26}
     27
     28static inline bool __must_check arch_get_random_int(unsigned int *v)
     29{
     30	return false;
     31}
     32
     33static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
     34{
     35	if (static_branch_likely(&s390_arch_random_available)) {
     36		cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
     37		atomic64_add(sizeof(*v), &s390_arch_random_counter);
     38		return true;
     39	}
     40	return false;
     41}
     42
     43static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
     44{
     45	if (static_branch_likely(&s390_arch_random_available)) {
     46		cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v));
     47		atomic64_add(sizeof(*v), &s390_arch_random_counter);
     48		return true;
     49	}
     50	return false;
     51}
     52
     53#endif /* CONFIG_ARCH_RANDOM */
     54#endif /* _ASM_S390_ARCHRANDOM_H */