include/asm-generic/cacheflush.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_CACHEFLUSH_H
   3 #define __ASM_CACHEFLUSH_H
   4
   5 /* Keep includes the same across arches.  */
   6 #include <linux/mm.h>
   7
   8 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
   9
  10 /*
  11  * The cache doesn't need to be flushed when TLB entries change when
  12  * the cache is mapped to physical memory, not virtual memory
  13  */
  14 static inline void flush_cache_all(void)
  15 {
  16 }
  17
  18 static inline void flush_cache_mm(struct mm_struct *mm)
  19 {
  20 }
  21
  22 static inline void flush_cache_dup_mm(struct mm_struct *mm)
  23 {
  24 }
  25
  26 static inline void flush_cache_range(struct vm_area_struct *vma,
  27                                      unsigned long start,
  28                                      unsigned long end)
  29 {
  30 }
  31
  32 static inline void flush_cache_page(struct vm_area_struct *vma,
  33                                     unsigned long vmaddr,
  34                                     unsigned long pfn)
  35 {
  36 }
  37
  38 static inline void flush_dcache_page(struct page *page)
  39 {
  40 }
  41
  42 static inline void flush_dcache_mmap_lock(struct address_space *mapping)
  43 {
  44 }
  45
  46 static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
  47 {
  48 }
  49
  50 static inline void flush_icache_range(unsigned long start, unsigned long end)
  51 {
  52 }
  53
  54 static inline void flush_icache_page(struct vm_area_struct *vma,
  55                                      struct page *page)
  56 {
  57 }
  58
  59 static inline void flush_icache_user_range(struct vm_area_struct *vma,
  60                                            struct page *page,
  61                                            unsigned long addr, int len)
  62 {
  63 }
  64
  65 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
  66 {
  67 }
  68
  69 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
  70 {
  71 }
  72
  73 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
  74         do { \
  75                 memcpy(dst, src, len); \
  76                 flush_icache_user_range(vma, page, vaddr, len); \
  77         } while (0)
  78 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
  79         memcpy(dst, src, len)
  80
  81 #endif /* __ASM_CACHEFLUSH_H */