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 /*
   9  * The cache doesn't need to be flushed when TLB entries change when
  10  * the cache is mapped to physical memory, not virtual memory
  11  */
  12 #define flush_cache_all()                       do { } while (0)
  13 #define flush_cache_mm(mm)                      do { } while (0)
  14 #define flush_cache_dup_mm(mm)                  do { } while (0)
  15 #define flush_cache_range(vma, start, end)      do { } while (0)
  16 #define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
  17 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
  18 #define flush_dcache_page(page)                 do { } while (0)
  19 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  20 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  21 #define flush_icache_range(start, end)          do { } while (0)
  22 #define flush_icache_page(vma,pg)               do { } while (0)
  23 #define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
  24 #define flush_cache_vmap(start, end)            do { } while (0)
  25 #define flush_cache_vunmap(start, end)          do { } while (0)
  26
  27 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
  28         do { \
  29                 memcpy(dst, src, len); \
  30                 flush_icache_user_range(vma, page, vaddr, len); \
  31         } while (0)
  32 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
  33         memcpy(dst, src, len)
  34
  35 #endif /* __ASM_CACHEFLUSH_H */