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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Optimized memory copy routines. | |
3 | * | |
4 | * Copyright (C) 2004 Randolph Chung <tausq@debian.org> | |
554bfece | 5 | * Copyright (C) 2013-2017 Helge Deller <deller@gmx.de> |
1da177e4 LT |
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 | * | |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/compiler.h> | |
db080f9c | 28 | #include <linux/uaccess.h> |
1da177e4 LT |
29 | |
30 | DECLARE_PER_CPU(struct exception_data, exception_data); | |
31 | ||
1da177e4 LT |
32 | #define get_user_space() (segment_eq(get_fs(), KERNEL_DS) ? 0 : mfsp(3)) |
33 | #define get_kernel_space() (0) | |
34 | ||
5b879d78 | 35 | /* Returns 0 for success, otherwise, returns number of bytes not transferred. */ |
554bfece HD |
36 | extern unsigned long pa_memcpy(void *dst, const void *src, |
37 | unsigned long len); | |
5b879d78 | 38 | |
9e91db6b HD |
39 | unsigned long __copy_to_user(void __user *dst, const void *src, |
40 | unsigned long len) | |
1da177e4 LT |
41 | { |
42 | mtsp(get_kernel_space(), 1); | |
43 | mtsp(get_user_space(), 2); | |
44 | return pa_memcpy((void __force *)dst, src, len); | |
45 | } | |
9e91db6b | 46 | EXPORT_SYMBOL(__copy_to_user); |
1da177e4 | 47 | |
9e91db6b HD |
48 | unsigned long __copy_from_user(void *dst, const void __user *src, |
49 | unsigned long len) | |
1da177e4 LT |
50 | { |
51 | mtsp(get_user_space(), 1); | |
52 | mtsp(get_kernel_space(), 2); | |
53 | return pa_memcpy(dst, (void __force *)src, len); | |
54 | } | |
9e91db6b | 55 | EXPORT_SYMBOL(__copy_from_user); |
1da177e4 LT |
56 | |
57 | unsigned long 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 | ||
1da177e4 LT |
73 | EXPORT_SYMBOL(copy_in_user); |
74 | EXPORT_SYMBOL(memcpy); | |
db080f9c HD |
75 | |
76 | long probe_kernel_read(void *dst, const void *src, size_t size) | |
77 | { | |
78 | unsigned long addr = (unsigned long)src; | |
79 | ||
964f4133 | 80 | if (addr < PAGE_SIZE) |
db080f9c HD |
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 | } |