arch/riscv/include/asm/set_memory.h

   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
  14 int set_memory_ro(unsigned long addr, int numpages);
  15 int set_memory_rw(unsigned long addr, int numpages);
  16 int set_memory_x(unsigned long addr, int numpages);
  17 int set_memory_nx(unsigned long addr, int numpages);
  18 int set_memory_rw_nx(unsigned long addr, int numpages);
  19 void protect_kernel_text_data(void);
  20 #else
  21 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
  22 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
  23 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
  24 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
  25 static inline void protect_kernel_text_data(void) {};
  26 static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
  27 #endif
  28
  29 int set_direct_map_invalid_noflush(struct page *page);
  30 int set_direct_map_default_noflush(struct page *page);
  31 bool kernel_page_present(struct page *page);
  32
  33 #endif /* __ASSEMBLY__ */
  34
  35 #ifdef CONFIG_ARCH_HAS_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_ARCH_HAS_STRICT_KERNEL_RWX */
  42 #define SECTION_ALIGN L1_CACHE_BYTES
  43 #endif /* CONFIG_ARCH_HAS_STRICT_KERNEL_RWX */
  44
  45 #endif /* _ASM_RISCV_SET_MEMORY_H */