LXR linux/arch/arm64/lib/uaccess

   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
  10void 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        __clean_dcache_area_pop(dst, cnt);
  19}
  20EXPORT_SYMBOL_GPL(memcpy_flushcache);
  21
  22void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
  23                            size_t len)
  24{
  25        memcpy_flushcache(to, page_address(page) + offset, len);
  26}
  27
  28unsigned long __copy_user_flushcache(void *to, const void __user *from,
  29                                     unsigned long n)
  30{
  31        unsigned long rc = __arch_copy_from_user(to, from, n);
  32
  33        /* See above */
  34        __clean_dcache_area_pop(to, n - rc);
  35        return rc;
  36}
  37