/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_RISCV_KFENCE_H #define _ASM_RISCV_KFENCE_H #include <linux/kfence.h> #include <linux/pfn.h> #include <asm-generic/pgalloc.h> #include <asm/pgtable.h> static inline bool arch_kfence_init_pool(void) { return true; } static inline bool kfence_protect_page(unsigned long addr, bool protect) { pte_t *pte = virt_to_kpte(addr); if (protect) set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT)); else set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT)); preempt_disable(); local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE); preempt_enable(); return true; } #endif /* _ASM_RISCV_KFENCE_H */