1 /* 2 * Optimized memory copy routines. 3 * 4 * Copyright (C) 2004 Randolph Chung <tausq@debian.org> 5 * Copyright (C) 2013-2017 Helge Deller <deller@gmx.de> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 * 21 * Portions derived from the GNU C Library 22 * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. 23 * 24 */ 25 26 #include <linux/module.h> 27 #include <linux/compiler.h> 28 #include <linux/uaccess.h> 29 30 #define get_user_space() (uaccess_kernel() ? 0 : mfsp(3)) 31 #define get_kernel_space() (0) 32 33 /* Returns 0 for success, otherwise, returns number of bytes not transferred. */ 34 extern unsigned long pa_memcpy(void *dst, const void *src, 35 unsigned long len); 36 37 unsigned long raw_copy_to_user(void __user *dst, const void *src, 38 unsigned long len) 39 { 40 mtsp(get_kernel_space(), 1); 41 mtsp(get_user_space(), 2); 42 return pa_memcpy((void __force *)dst, src, len); 43 } 44 EXPORT_SYMBOL(raw_copy_to_user); 45 46 unsigned long raw_copy_from_user(void *dst, const void __user *src, 47 unsigned long len) 48 { 49 mtsp(get_user_space(), 1); 50 mtsp(get_kernel_space(), 2); 51 return pa_memcpy(dst, (void __force *)src, len); 52 } 53 EXPORT_SYMBOL(raw_copy_from_user); 54 55 unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len) 56 { 57 mtsp(get_user_space(), 1); 58 mtsp(get_user_space(), 2); 59 return pa_memcpy((void __force *)dst, (void __force *)src, len); 60 } 61 62 63 void * memcpy(void * dst,const void *src, size_t count) 64 { 65 mtsp(get_kernel_space(), 1); 66 mtsp(get_kernel_space(), 2); 67 pa_memcpy(dst, src, count); 68 return dst; 69 } 70 71 EXPORT_SYMBOL(raw_copy_in_user); 72 EXPORT_SYMBOL(memcpy); 73 74 long probe_kernel_read(void *dst, const void *src, size_t size) 75 { 76 unsigned long addr = (unsigned long)src; 77 78 if (addr < PAGE_SIZE) 79 return -EFAULT; 80 81 /* check for I/O space F_EXTEND(0xfff00000) access as well? */ 82 83 return __probe_kernel_read(dst, src, size); 84 } 85