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 DECLARE_PER_CPU(struct exception_data, exception_data); 31 32 #define get_user_space() (uaccess_kernel() ? 0 : mfsp(3)) 33 #define get_kernel_space() (0) 34 35 /* Returns 0 for success, otherwise, returns number of bytes not transferred. */ 36 extern unsigned long pa_memcpy(void *dst, const void *src, 37 unsigned long len); 38 39 unsigned long raw_copy_to_user(void __user *dst, const void *src, 40 unsigned long len) 41 { 42 mtsp(get_kernel_space(), 1); 43 mtsp(get_user_space(), 2); 44 return pa_memcpy((void __force *)dst, src, len); 45 } 46 EXPORT_SYMBOL(raw_copy_to_user); 47 48 unsigned long raw_copy_from_user(void *dst, const void __user *src, 49 unsigned long len) 50 { 51 mtsp(get_user_space(), 1); 52 mtsp(get_kernel_space(), 2); 53 return pa_memcpy(dst, (void __force *)src, len); 54 } 55 EXPORT_SYMBOL(raw_copy_from_user); 56 57 unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len) 58 { 59 mtsp(get_user_space(), 1); 60 mtsp(get_user_space(), 2); 61 return pa_memcpy((void __force *)dst, (void __force *)src, len); 62 } 63 64 65 void * memcpy(void * dst,const void *src, size_t count) 66 { 67 mtsp(get_kernel_space(), 1); 68 mtsp(get_kernel_space(), 2); 69 pa_memcpy(dst, src, count); 70 return dst; 71 } 72 73 EXPORT_SYMBOL(raw_copy_in_user); 74 EXPORT_SYMBOL(memcpy); 75 76 long probe_kernel_read(void *dst, const void *src, size_t size) 77 { 78 unsigned long addr = (unsigned long)src; 79 80 if (addr < PAGE_SIZE) 81 return -EFAULT; 82 83 /* check for I/O space F_EXTEND(0xfff00000) access as well? */ 84 85 return __probe_kernel_read(dst, src, size); 86 } 87