2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 * Misc memory accessors
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.
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.
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
23 #include <linux/config.h>
25 #include <asm/uaccess.h>
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
33 * Copies the data from mmio-space to user-space.
35 * Returns zero if successful, or non-zero on failure.
37 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
39 #if defined(__i386__) || defined(CONFIG_SPARC32)
40 return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
47 memcpy_fromio(buf, (void __iomem *)src, c);
48 if (copy_to_user(dst, buf, c))
59 * copy_from_user_toio - copy data from user-space to mmio-space
60 * @dst: the destination pointer on mmio-space
61 * @src: the source pointer on user-space
62 * @count: the data size to copy in bytes
64 * Copies the data from user-space to mmio-space.
66 * Returns zero if successful, or non-zero on failure.
68 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
70 #if defined(__i386__) || defined(CONFIG_SPARC32)
71 return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
78 if (copy_from_user(buf, src, c))
80 memcpy_toio(dst, buf, c);