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 static __always_inline int set_kernel_memory(char *startp, char *endp,
  20                                              int (*set_memory)(unsigned long start,
  21                                                                int num_pages))
  22 {
  23         unsigned long start = (unsigned long)startp;
  24         unsigned long end = (unsigned long)endp;
  25         int num_pages = PAGE_ALIGN(end - start) >> PAGE_SHIFT;
  26
  27         return set_memory(start, num_pages);
  28 }
  29 #else
  30 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
  31 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
  32 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
  33 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
  34 static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
  35 static inline int set_kernel_memory(char *startp, char *endp,
  36                                     int (*set_memory)(unsigned long start,
  37                                                       int num_pages))
  38 {
  39         return 0;
  40 }
  41 #endif
  42
  43 int set_direct_map_invalid_noflush(struct page *page);
  44 int set_direct_map_default_noflush(struct page *page);
  45 bool kernel_page_present(struct page *page);
  46
  47 #endif /* __ASSEMBLY__ */
  48
  49 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_XIP_KERNEL)
  50 #ifdef CONFIG_64BIT
  51 #define SECTION_ALIGN (1 << 21)
  52 #else
  53 #define SECTION_ALIGN (1 << 22)
  54 #endif
  55 #else /* !CONFIG_STRICT_KERNEL_RWX */
  56 #define SECTION_ALIGN L1_CACHE_BYTES
  57 #endif /* CONFIG_STRICT_KERNEL_RWX */
  58
  59 #define PECOFF_SECTION_ALIGNMENT        0x1000
  60 #define PECOFF_FILE_ALIGNMENT           0x200
  61
  62 #endif /* _ASM_RISCV_SET_MEMORY_H */