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 21 void 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 } 31 EXPORT_SYMBOL_GPL(memcpy_flushcache); 32 33 void 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 39 unsigned 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 } 48