mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 07:02:06 +00:00
038b0a6d8d
kbuild explicitly includes this at build time. Signed-off-by: Dave Jones <davej@redhat.com>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
|
|
*
|
|
* Misc memory accessors
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/**
|
|
* copy_to_user_fromio - copy data from mmio-space to user-space
|
|
* @dst: the destination pointer on user-space
|
|
* @src: the source pointer on mmio
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from mmio-space to user-space.
|
|
*
|
|
* Returns zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
|
|
{
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
|
return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
|
|
#else
|
|
char buf[256];
|
|
while (count) {
|
|
size_t c = count;
|
|
if (c > sizeof(buf))
|
|
c = sizeof(buf);
|
|
memcpy_fromio(buf, (void __iomem *)src, c);
|
|
if (copy_to_user(dst, buf, c))
|
|
return -EFAULT;
|
|
count -= c;
|
|
dst += c;
|
|
src += c;
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
EXPORT_SYMBOL(copy_to_user_fromio);
|
|
|
|
/**
|
|
* copy_from_user_toio - copy data from user-space to mmio-space
|
|
* @dst: the destination pointer on mmio-space
|
|
* @src: the source pointer on user-space
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from user-space to mmio-space.
|
|
*
|
|
* Returns zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
|
|
{
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
|
return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
|
|
#else
|
|
char buf[256];
|
|
while (count) {
|
|
size_t c = count;
|
|
if (c > sizeof(buf))
|
|
c = sizeof(buf);
|
|
if (copy_from_user(buf, src, c))
|
|
return -EFAULT;
|
|
memcpy_toio(dst, buf, c);
|
|
count -= c;
|
|
dst += c;
|
|
src += c;
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
EXPORT_SYMBOL(copy_from_user_toio);
|