include/asm-generic/cacheflush.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_GENERIC_CACHEFLUSH_H
   3 #define _ASM_GENERIC_CACHEFLUSH_H
   4
   5 #include <linux/instrumented.h>
   6
   7 struct mm_struct;
   8 struct vm_area_struct;
   9 struct page;
  10 struct address_space;
  11
  12 /*
  13  * The cache doesn't need to be flushed when TLB entries change when
  14  * the cache is mapped to physical memory, not virtual memory
  15  */
  16 #ifndef flush_cache_all
  17 static inline void flush_cache_all(void)
  18 {
  19 }
  20 #endif
  21
  22 #ifndef flush_cache_mm
  23 static inline void flush_cache_mm(struct mm_struct *mm)
  24 {
  25 }
  26 #endif
  27
  28 #ifndef flush_cache_dup_mm
  29 static inline void flush_cache_dup_mm(struct mm_struct *mm)
  30 {
  31 }
  32 #endif
  33
  34 #ifndef flush_cache_range
  35 static inline void flush_cache_range(struct vm_area_struct *vma,
  36                                      unsigned long start,
  37                                      unsigned long end)
  38 {
  39 }
  40 #endif
  41
  42 #ifndef flush_cache_page
  43 static inline void flush_cache_page(struct vm_area_struct *vma,
  44                                     unsigned long vmaddr,
  45                                     unsigned long pfn)
  46 {
  47 }
  48 #endif
  49
  50 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
  51 static inline void flush_dcache_page(struct page *page)
  52 {
  53 }
  54
  55 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
  56 #endif
  57
  58 #ifndef flush_dcache_mmap_lock
  59 static inline void flush_dcache_mmap_lock(struct address_space *mapping)
  60 {
  61 }
  62 #endif
  63
  64 #ifndef flush_dcache_mmap_unlock
  65 static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
  66 {
  67 }
  68 #endif
  69
  70 #ifndef flush_icache_range
  71 static inline void flush_icache_range(unsigned long start, unsigned long end)
  72 {
  73 }
  74 #endif
  75
  76 #ifndef flush_icache_user_range
  77 #define flush_icache_user_range flush_icache_range
  78 #endif
  79
  80 #ifndef flush_icache_user_page
  81 static inline void flush_icache_user_page(struct vm_area_struct *vma,
  82                                            struct page *page,
  83                                            unsigned long addr, int len)
  84 {
  85 }
  86 #endif
  87
  88 #ifndef flush_cache_vmap
  89 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
  90 {
  91 }
  92 #endif
  93
  94 #ifndef flush_cache_vmap_early
  95 static inline void flush_cache_vmap_early(unsigned long start, unsigned long end)
  96 {
  97 }
  98 #endif
  99
 100 #ifndef flush_cache_vunmap
 101 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 102 {
 103 }
 104 #endif
 105
 106 #ifndef copy_to_user_page
 107 #define copy_to_user_page(vma, page, vaddr, dst, src, len)      \
 108         do { \
 109                 instrument_copy_to_user((void __user *)dst, src, len); \
 110                 memcpy(dst, src, len); \
 111                 flush_icache_user_page(vma, page, vaddr, len); \
 112         } while (0)
 113 #endif
 114
 115
 116 #ifndef copy_from_user_page
 117 #define copy_from_user_page(vma, page, vaddr, dst, src, len)              \
 118         do {                                                              \
 119                 instrument_copy_from_user_before(dst, (void __user *)src, \
 120                                                  len);                    \
 121                 memcpy(dst, src, len);                                    \
 122                 instrument_copy_from_user_after(dst, (void __user *)src, len, \
 123                                                 0);                       \
 124         } while (0)
 125 #endif
 126
 127 #endif /* _ASM_GENERIC_CACHEFLUSH_H */