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);
  19static __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
  30static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
  31static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
  32static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
  33static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
  34static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
  35static 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
  43int set_direct_map_invalid_noflush(struct page *page);
  44int set_direct_map_default_noflush(struct page *page);
  45bool kernel_page_present(struct page *page);
  46
  47#endif /* __ASSEMBLY__ */
  48
  49#ifdef CONFIG_STRICT_KERNEL_RWX
  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#endif /* _ASM_RISCV_SET_MEMORY_H */
  60