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
memcpy_flushcache(void * dst,const void * src,size_t cnt)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
__copy_user_flushcache(void * to,const void __user * from,unsigned long n)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 }
33