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 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 __clean_dcache_area_pop(dst, cnt); 19 } 20 EXPORT_SYMBOL_GPL(memcpy_flushcache); 21 22 void 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 28 unsigned long __copy_user_flushcache(void *to, const void __user *from, 29 unsigned long n) 30 { 31 unsigned long rc; 32 33 uaccess_enable_not_uao(); 34 rc = __arch_copy_from_user(to, from, n); 35 uaccess_disable_not_uao(); 36 37 /* See above */ 38 __clean_dcache_area_pop(to, n - rc); 39 return rc; 40 } 41