LXR linux/arch/riscv/include/asm/set

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2019 SiFive
   4 */
   5
   6#ifndef _ASM_RISCV_SET_MEMORY_H
   7#define _ASM_RISCV_SET_MEMORY_H
   8
   9#ifndef __ASSEMBLY__
  10/*
  11 * Functions to change memory attributes.
  12 */
  13#ifdef CONFIG_MMU
  14int set_memory_ro(unsigned long addr, int numpages);
  15int set_memory_rw(unsigned long addr, int numpages);
  16int set_memory_x(unsigned long addr, int numpages);
  17int set_memory_nx(unsigned long addr, int numpages);
  18int set_memory_rw_nx(unsigned long addr, int numpages);
  19void protect_kernel_text_data(void);
  20#else
  21static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
  22static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
  23static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
  24static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
  25static inline void protect_kernel_text_data(void) {};
  26static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
  27#endif
  28
  29int set_direct_map_invalid_noflush(struct page *page);
  30int set_direct_map_default_noflush(struct page *page);
  31bool kernel_page_present(struct page *page);
  32
  33#endif /* __ASSEMBLY__ */
  34
  35#ifdef CONFIG_STRICT_KERNEL_RWX
  36#ifdef CONFIG_64BIT
  37#define SECTION_ALIGN (1 << 21)
  38#else
  39#define SECTION_ALIGN (1 << 22)
  40#endif
  41#else /* !CONFIG_STRICT_KERNEL_RWX */
  42#define SECTION_ALIGN L1_CACHE_BYTES
  43#endif /* CONFIG_STRICT_KERNEL_RWX */
  44
  45#endif /* _ASM_RISCV_SET_MEMORY_H */
  46