| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * powerpc KFENCE support. |
| * |
| * Copyright (C) 2020 CS GROUP France |
| */ |
| |
| #ifndef __ASM_POWERPC_KFENCE_H |
| #define __ASM_POWERPC_KFENCE_H |
| |
| #include <linux/mm.h> |
| #include <asm/pgtable.h> |
| |
| static inline bool arch_kfence_init_pool(void) |
| { |
| return true; |
| } |
| |
| static inline bool kfence_protect_page(unsigned long addr, bool protect) |
| { |
| pte_t *kpte = virt_to_kpte(addr); |
| |
| if (protect) { |
| pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0); |
| flush_tlb_kernel_range(addr, addr + PAGE_SIZE); |
| } else { |
| pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0); |
| } |
| |
| return true; |
| } |
| |
| #endif /* __ASM_POWERPC_KFENCE_H */ |
