include/linux/set_memory.h

   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
  11 static inline int __must_check set_memory_ro(unsigned long addr, int numpages) { return 0; }
  12 static inline int __must_check set_memory_rw(unsigned long addr, int numpages) { return 0; }
  13 static inline int __must_check set_memory_x(unsigned long addr,  int numpages) { return 0; }
  14 static inline int __must_check set_memory_nx(unsigned long addr, int numpages) { return 0; }
  15 #endif
  16
  17 #ifndef set_memory_rox
  18 static inline int set_memory_rox(unsigned long addr, int numpages)
  19 {
  20         int ret = set_memory_ro(addr, numpages);
  21         if (ret)
  22                 return ret;
  23         return set_memory_x(addr, numpages);
  24 }
  25 #endif
  26
  27 #ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
  28 static inline int set_direct_map_invalid_noflush(struct page *page)
  29 {
  30         return 0;
  31 }
  32 static inline int set_direct_map_default_noflush(struct page *page)
  33 {
  34         return 0;
  35 }
  36
  37 static inline int set_direct_map_valid_noflush(struct page *page,
  38                                                unsigned nr, bool valid)
  39 {
  40         return 0;
  41 }
  42
  43 static inline bool kernel_page_present(struct page *page)
  44 {
  45         return true;
  46 }
  47 #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
  48 /*
  49  * Some architectures, e.g. ARM64 can disable direct map modifications at
  50  * boot time. Let them overrive this query.
  51  */
  52 #ifndef can_set_direct_map
  53 static inline bool can_set_direct_map(void)
  54 {
  55         return true;
  56 }
  57 #define can_set_direct_map can_set_direct_map
  58 #endif
  59 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
  60
  61 #ifdef CONFIG_X86_64
  62 int set_mce_nospec(unsigned long pfn);
  63 int clear_mce_nospec(unsigned long pfn);
  64 #else
  65 static inline int set_mce_nospec(unsigned long pfn)
  66 {
  67         return 0;
  68 }
  69 static inline int clear_mce_nospec(unsigned long pfn)
  70 {
  71         return 0;
  72 }
  73 #endif
  74
  75 #ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
  76 static inline int set_memory_encrypted(unsigned long addr, int numpages)
  77 {
  78         return 0;
  79 }
  80
  81 static inline int set_memory_decrypted(unsigned long addr, int numpages)
  82 {
  83         return 0;
  84 }
  85 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
  86
  87 #endif /* _LINUX_SET_MEMORY_H_ */