uaccess_flushcache.c (963B)
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 10void 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} 20EXPORT_SYMBOL_GPL(memcpy_flushcache); 21 22void 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 28unsigned long __copy_user_flushcache(void *to, const void __user *from, 29 unsigned long n) 30{ 31 unsigned long rc; 32 33 rc = raw_copy_from_user(to, from, n); 34 35 /* See above */ 36 dcache_clean_pop((unsigned long)to, (unsigned long)to + n - rc); 37 return rc; 38}