Linux kernel mirror (for testing)
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linux
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 dcache_clean_pop((unsigned long)dst, (unsigned long)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;
32
33 rc = raw_copy_from_user(to, from, n);
34
35 /* See above */
36 dcache_clean_pop((unsigned long)to, (unsigned long)to + n - rc);
37 return rc;
38}