diff options
Diffstat (limited to 'arch/riscv/include/asm/kfence.h')
| -rw-r--r-- | arch/riscv/include/asm/kfence.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/kfence.h b/arch/riscv/include/asm/kfence.h new file mode 100644 index 0000000000..0bbffd5280 --- /dev/null +++ b/arch/riscv/include/asm/kfence.h @@ -0,0 +1,30 @@ +/* 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(*pte) & ~_PAGE_PRESENT)); + else + set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT)); + + flush_tlb_kernel_range(addr, addr + PAGE_SIZE); + + return true; +} + +#endif /* _ASM_RISCV_KFENCE_H */ |