tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2017 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/uaccess.h>
18#include <asm/barrier.h>
19#include <asm/cacheflush.h>
20
21void memcpy_flushcache(void *dst, const void *src, size_t cnt)
22{
23 /*
24 * We assume this should not be called with @dst pointing to
25 * non-cacheable memory, such that we don't need an explicit
26 * barrier to order the cache maintenance against the memcpy.
27 */
28 memcpy(dst, src, cnt);
29 __clean_dcache_area_pop(dst, cnt);
30}
31EXPORT_SYMBOL_GPL(memcpy_flushcache);
32
33void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
34 size_t len)
35{
36 memcpy_flushcache(to, page_address(page) + offset, len);
37}
38
39unsigned long __copy_user_flushcache(void *to, const void __user *from,
40 unsigned long n)
41{
42 unsigned long rc = __arch_copy_from_user(to, from, n);
43
44 /* See above */
45 __clean_dcache_area_pop(to, n - rc);
46 return rc;
47}