arch/powerpc/include/asm/kfence.h

   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 */