arch/arm64/lib/uaccess_flushcache.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 ARM Ltd.
   4  */
   5
   6 #include <linux/uaccess.h>
   7 #include <asm/barrier.h>
   8 #include <asm/cacheflush.h>
   9
  10 void memcpy_flushcache(void *dst, const void *src, size_t cnt)
  11 {
  12         /*
  13          * We assume this should not be called with @dst pointing to
  14          * non-cacheable memory, such that we don't need an explicit
  15          * barrier to order the cache maintenance against the memcpy.
  16          */
  17         memcpy(dst, src, cnt);
  18         dcache_clean_pop((unsigned long)dst, (unsigned long)dst + cnt);
  19 }
  20 EXPORT_SYMBOL_GPL(memcpy_flushcache);
  21
  22 unsigned long __copy_user_flushcache(void *to, const void __user *from,
  23                                      unsigned long n)
  24 {
  25         unsigned long rc;
  26
  27         rc = raw_copy_from_user(to, from, n);
  28
  29         /* See above */
  30         dcache_clean_pop((unsigned long)to, (unsigned long)to + n - rc);
  31         return rc;
  32 }