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 static inline bool arch_kfence_init_pool(void) 15 { 16 return true; 17 } 18 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