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
14 #ifdef CONFIG_PPC64_ELF_ABI_V1
15 #define ARCH_FUNC_PREFIX "."
16 #endif
17
arch_kfence_init_pool(void)18 static inline bool arch_kfence_init_pool(void)
19 {
20 return true;
21 }
22
23 #ifdef CONFIG_PPC64
kfence_protect_page(unsigned long addr,bool protect)24 static inline bool kfence_protect_page(unsigned long addr, bool protect)
25 {
26 struct page *page = virt_to_page((void *)addr);
27
28 __kernel_map_pages(page, 1, !protect);
29
30 return true;
31 }
32 #else
kfence_protect_page(unsigned long addr,bool protect)33 static inline bool kfence_protect_page(unsigned long addr, bool protect)
34 {
35 pte_t *kpte = virt_to_kpte(addr);
36
37 if (protect) {
38 pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0);
39 flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
40 } else {
41 pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0);
42 }
43
44 return true;
45 }
46 #endif
47
48 #endif /* __ASM_POWERPC_KFENCE_H */
49