1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Optimized memory copy routines. 4 * 5 * Copyright (C) 2004 Randolph Chung <tausq@debian.org> 6 * Copyright (C) 2013-2017 Helge Deller <deller@gmx.de> 7 * 8 * Portions derived from the GNU C Library 9 * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. 10 */ 11 12#include <linux/module.h> 13#include <linux/compiler.h> 14#include <linux/uaccess.h> 15 16#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3)) 17#define get_kernel_space() (0) 18 19/* Returns 0 for success, otherwise, returns number of bytes not transferred. */ 20extern unsigned long pa_memcpy(void *dst, const void *src, 21 unsigned long len); 22 23unsigned long raw_copy_to_user(void __user *dst, const void *src, 24 unsigned long len) 25{ 26 mtsp(get_kernel_space(), 1); 27 mtsp(get_user_space(), 2); 28 return pa_memcpy((void __force *)dst, src, len); 29} 30EXPORT_SYMBOL(raw_copy_to_user); 31 32unsigned long raw_copy_from_user(void *dst, const void __user *src, 33 unsigned long len) 34{ 35 mtsp(get_user_space(), 1); 36 mtsp(get_kernel_space(), 2); 37 return pa_memcpy(dst, (void __force *)src, len); 38} 39EXPORT_SYMBOL(raw_copy_from_user); 40 41unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len) 42{ 43 mtsp(get_user_space(), 1); 44 mtsp(get_user_space(), 2); 45 return pa_memcpy((void __force *)dst, (void __force *)src, len); 46} 47 48 49void * memcpy(void * dst,const void *src, size_t count) 50{ 51 mtsp(get_kernel_space(), 1); 52 mtsp(get_kernel_space(), 2); 53 pa_memcpy(dst, src, count); 54 return dst; 55} 56 57EXPORT_SYMBOL(raw_copy_in_user); 58EXPORT_SYMBOL(memcpy); 59 60bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) 61{ 62 if ((unsigned long)unsafe_src < PAGE_SIZE) 63 return false; 64 /* check for I/O space F_EXTEND(0xfff00000) access as well? */ 65 return true; 66} 67