162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */
262306a36Sopenharmony_ci/*
362306a36Sopenharmony_ci * arm64 KFENCE support.
462306a36Sopenharmony_ci *
562306a36Sopenharmony_ci * Copyright (C) 2020, Google LLC.
662306a36Sopenharmony_ci */
762306a36Sopenharmony_ci
862306a36Sopenharmony_ci#ifndef __ASM_KFENCE_H
962306a36Sopenharmony_ci#define __ASM_KFENCE_H
1062306a36Sopenharmony_ci
1162306a36Sopenharmony_ci#include <asm/set_memory.h>
1262306a36Sopenharmony_ci
1362306a36Sopenharmony_cistatic inline bool arch_kfence_init_pool(void) { return true; }
1462306a36Sopenharmony_ci
1562306a36Sopenharmony_cistatic inline bool kfence_protect_page(unsigned long addr, bool protect)
1662306a36Sopenharmony_ci{
1762306a36Sopenharmony_ci	set_memory_valid(addr, 1, !protect);
1862306a36Sopenharmony_ci
1962306a36Sopenharmony_ci	return true;
2062306a36Sopenharmony_ci}
2162306a36Sopenharmony_ci
2262306a36Sopenharmony_ci#ifdef CONFIG_KFENCE
2362306a36Sopenharmony_ciextern bool kfence_early_init;
2462306a36Sopenharmony_cistatic inline bool arm64_kfence_can_set_direct_map(void)
2562306a36Sopenharmony_ci{
2662306a36Sopenharmony_ci	return !kfence_early_init;
2762306a36Sopenharmony_ci}
2862306a36Sopenharmony_ci#else /* CONFIG_KFENCE */
2962306a36Sopenharmony_cistatic inline bool arm64_kfence_can_set_direct_map(void) { return false; }
3062306a36Sopenharmony_ci#endif /* CONFIG_KFENCE */
3162306a36Sopenharmony_ci
3262306a36Sopenharmony_ci#endif /* __ASM_KFENCE_H */
33