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 18static inline bool arch_kfence_init_pool(void) 19{ 20 return true; 21} 22 23#ifdef CONFIG_PPC64 24static 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 33static 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