1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * powerpc KFENCE support.
4 *
5 * Copyright (C) 2020 CS GROUP France
6 */
7
8 #ifndef __ASM_POWERPC_KFENCE_H
9 #define __ASM_POWERPC_KFENCE_H
10
11 #include <linux/mm.h>
12 #include <asm/pgtable.h>
13
arch_kfence_init_pool(void)14 static inline bool arch_kfence_init_pool(void)
15 {
16 return true;
17 }
18
kfence_protect_page(unsigned long addr,bool protect)19 static inline bool kfence_protect_page(unsigned long addr, bool protect)
20 {
21 pte_t *kpte = virt_to_kpte(addr);
22
23 if (protect) {
24 pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0);
25 flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
26 } else {
27 pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0);
28 }
29
30 return true;
31 }
32
33 #endif /* __ASM_POWERPC_KFENCE_H */
34