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1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
3 | * |
4 | * Misc memory accessors |
5 | * |
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 of the License, or |
10 | * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | * |
21 | */ |
22 | |
23 | #include <asm/io.h> |
24 | #include <asm/uaccess.h> |
25 | #include <sound/core.h> |
26 | |
27 | /** |
28 | * copy_to_user_fromio - copy data from mmio-space to user-space |
29 | * @dst: the destination pointer on user-space |
30 | * @src: the source pointer on mmio |
31 | * @count: the data size to copy in bytes |
32 | * |
33 | * Copies the data from mmio-space to user-space. |
34 | * |
35 | * Returns zero if successful, or non-zero on failure. |
36 | */ |
37 | int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) |
38 | { |
39 | #if defined(__i386__) || defined(CONFIG_SPARC32) |
40 | return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
41 | #else |
42 | char buf[256]; |
43 | while (count) { |
44 | size_t c = count; |
45 | if (c > sizeof(buf)) |
46 | c = sizeof(buf); |
47 | memcpy_fromio(buf, (void __iomem *)src, c); |
48 | if (copy_to_user(dst, buf, c)) |
49 | return -EFAULT; |
50 | count -= c; |
51 | dst += c; |
52 | src += c; |
53 | } |
54 | return 0; |
55 | #endif |
56 | } |
57 | |
58 | EXPORT_SYMBOL(copy_to_user_fromio); |
59 | |
60 | /** |
61 | * copy_from_user_toio - copy data from user-space to mmio-space |
62 | * @dst: the destination pointer on mmio-space |
63 | * @src: the source pointer on user-space |
64 | * @count: the data size to copy in bytes |
65 | * |
66 | * Copies the data from user-space to mmio-space. |
67 | * |
68 | * Returns zero if successful, or non-zero on failure. |
69 | */ |
70 | int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) |
71 | { |
72 | #if defined(__i386__) || defined(CONFIG_SPARC32) |
73 | return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
74 | #else |
75 | char buf[256]; |
76 | while (count) { |
77 | size_t c = count; |
78 | if (c > sizeof(buf)) |
79 | c = sizeof(buf); |
80 | if (copy_from_user(buf, src, c)) |
81 | return -EFAULT; |
82 | memcpy_toio(dst, buf, c); |
83 | count -= c; |
84 | dst += c; |
85 | src += c; |
86 | } |
87 | return 0; |
88 | #endif |
89 | } |
90 | |
91 | EXPORT_SYMBOL(copy_from_user_toio); |
92 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9