| /* 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/cacheflush.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)); | |
| mark_new_valid_map(); | |
| } | |
| preempt_disable(); | |
| local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE); | |
| preempt_enable(); | |
| return true; | |
| } | |
| #endif /* _ASM_RISCV_KFENCE_H */ |