LXR linux/include/linux/set

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright 2017, Michael Ellerman, IBM Corporation.
   4 */
   5#ifndef _LINUX_SET_MEMORY_H_
   6#define _LINUX_SET_MEMORY_H_
   7
   8#ifdef CONFIG_ARCH_HAS_SET_MEMORY
   9#include <asm/set_memory.h>
  10#else
  11static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
  12static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
  13static inline int set_memory_x(unsigned long addr,  int numpages) { return 0; }
  14static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
  15#endif
  16
  17#ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
  18static inline int set_direct_map_invalid_noflush(struct page *page)
  19{
  20        return 0;
  21}
  22static inline int set_direct_map_default_noflush(struct page *page)
  23{
  24        return 0;
  25}
  26
  27static inline bool kernel_page_present(struct page *page)
  28{
  29        return true;
  30}
  31#else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
  32/*
  33 * Some architectures, e.g. ARM64 can disable direct map modifications at
  34 * boot time. Let them overrive this query.
  35 */
  36#ifndef can_set_direct_map
  37static inline bool can_set_direct_map(void)
  38{
  39        return true;
  40}
  41#define can_set_direct_map can_set_direct_map
  42#endif
  43#endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
  44
  45#ifndef set_mce_nospec
  46static inline int set_mce_nospec(unsigned long pfn, bool unmap)
  47{
  48        return 0;
  49}
  50#endif
  51
  52#ifndef clear_mce_nospec
  53static inline int clear_mce_nospec(unsigned long pfn)
  54{
  55        return 0;
  56}
  57#endif
  58
  59#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
  60static inline int set_memory_encrypted(unsigned long addr, int numpages)
  61{
  62        return 0;
  63}
  64
  65static inline int set_memory_decrypted(unsigned long addr, int numpages)
  66{
  67        return 0;
  68}
  69#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
  70
  71#endif /* _LINUX_SET_MEMORY_H_ */
  72