arch/riscv/include/asm/kfence.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef _ASM_RISCV_KFENCE_H
   4 #define _ASM_RISCV_KFENCE_H
   5
   6 #include <linux/kfence.h>
   7 #include <linux/pfn.h>
   8 #include <asm-generic/pgalloc.h>
   9 #include <asm/pgtable.h>
  10
  11 static inline bool arch_kfence_init_pool(void)
  12 {
  13         return true;
  14 }
  15
  16 static inline bool kfence_protect_page(unsigned long addr, bool protect)
  17 {
  18         pte_t *pte = virt_to_kpte(addr);
  19
  20         if (protect)
  21                 set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
  22         else
  23                 set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT));
  24
  25         flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
  26
  27         return true;
  28 }
  29
  30 #endif /* _ASM_RISCV_KFENCE_H */