1caab277bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 221cfa0e9SRobin Murphy /* 321cfa0e9SRobin Murphy * Copyright (C) 2017 ARM Ltd. 421cfa0e9SRobin Murphy */ 521cfa0e9SRobin Murphy 621cfa0e9SRobin Murphy #include <linux/uaccess.h> 721cfa0e9SRobin Murphy #include <asm/barrier.h> 821cfa0e9SRobin Murphy #include <asm/cacheflush.h> 921cfa0e9SRobin Murphy 1021cfa0e9SRobin Murphy void memcpy_flushcache(void *dst, const void *src, size_t cnt) 1121cfa0e9SRobin Murphy { 1221cfa0e9SRobin Murphy /* 1321cfa0e9SRobin Murphy * We assume this should not be called with @dst pointing to 1421cfa0e9SRobin Murphy * non-cacheable memory, such that we don't need an explicit 1521cfa0e9SRobin Murphy * barrier to order the cache maintenance against the memcpy. 1621cfa0e9SRobin Murphy */ 1721cfa0e9SRobin Murphy memcpy(dst, src, cnt); 1821cfa0e9SRobin Murphy __clean_dcache_area_pop(dst, cnt); 1921cfa0e9SRobin Murphy } 2021cfa0e9SRobin Murphy EXPORT_SYMBOL_GPL(memcpy_flushcache); 2121cfa0e9SRobin Murphy 2221cfa0e9SRobin Murphy void memcpy_page_flushcache(char *to, struct page *page, size_t offset, 2321cfa0e9SRobin Murphy size_t len) 2421cfa0e9SRobin Murphy { 2521cfa0e9SRobin Murphy memcpy_flushcache(to, page_address(page) + offset, len); 2621cfa0e9SRobin Murphy } 2721cfa0e9SRobin Murphy 2821cfa0e9SRobin Murphy unsigned long __copy_user_flushcache(void *to, const void __user *from, 2921cfa0e9SRobin Murphy unsigned long n) 3021cfa0e9SRobin Murphy { 31e50be648SPavel Tatashin unsigned long rc; 32e50be648SPavel Tatashin 33e50be648SPavel Tatashin uaccess_enable_not_uao(); 34e50be648SPavel Tatashin rc = __arch_copy_from_user(to, from, n); 35e50be648SPavel Tatashin uaccess_disable_not_uao(); 3621cfa0e9SRobin Murphy 3721cfa0e9SRobin Murphy /* See above */ 3821cfa0e9SRobin Murphy __clean_dcache_area_pop(to, n - rc); 3921cfa0e9SRobin Murphy return rc; 4021cfa0e9SRobin Murphy } 41