1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef __ASM_ARM_KFENCE_H
4 #define __ASM_ARM_KFENCE_H
6 #include <linux/kfence.h>
8 #include <asm/pgalloc.h>
9 #include <asm/set_memory.h>
11 static inline int split_pmd_page(pmd_t *pmd, unsigned long addr)
14 unsigned long pfn = PFN_DOWN(__pa(addr));
15 pte_t *pte = pte_alloc_one_kernel(&init_mm);
20 for (i = 0; i < PTRS_PER_PTE; i++)
21 set_pte_ext(pte + i, pfn_pte(pfn + i, PAGE_KERNEL), 0);
22 pmd_populate_kernel(&init_mm, pmd, pte);
24 flush_tlb_kernel_range(addr, addr + PMD_SIZE);
28 static inline bool arch_kfence_init_pool(void)
33 for (addr = (unsigned long)__kfence_pool; is_kfence_address((void *)addr);
35 pmd = pmd_off_k(addr);
38 if (split_pmd_page(pmd, addr & PMD_MASK))
46 static inline bool kfence_protect_page(unsigned long addr, bool protect)
48 set_memory_valid(addr, 1, !protect);
53 #endif /* __ASM_ARM_KFENCE_H */