tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
14static inline bool arch_kfence_init_pool(void)
15{
16 return true;
17}
18
19static 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 */