Viewing file:  mem_op.h (2.62 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* mem_op.h
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* The initial developer of the original code is David A. Hinds
* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
*
* (C) 1999 David A. Hinds
*/
#ifndef _LINUX_MEM_OP_H
#define _LINUX_MEM_OP_H
#include <asm/uaccess.h>
#include <asm/io.h>
/*
If UNSAFE_MEMCPY is defined, we use the (optimized) system routines
to copy between a card and kernel memory. These routines do 32-bit
operations which may not work with all PCMCIA controllers. The
safe versions defined here will do only 8-bit and 16-bit accesses.
*/
#ifdef UNSAFE_MEMCPY
#define copy_from_pc memcpy_fromio
#define copy_to_pc memcpy_toio
static inline void copy_pc_to_user(void *to, const void *from, size_t n)
{
size_t odd = (n & 3);
n -= odd;
while (n) {
put_user(__raw_readl(from), (int *)to);
(char *)from += 4; (char *)to += 4; n -= 4;
}
while (odd--)
put_user(readb((char *)from++), (char *)to++);
}
static inline void copy_user_to_pc(void *to, const void *from, size_t n)
{
int l;
char c;
size_t odd = (n & 3);
n -= odd;
while (n) {
get_user(l, (int *)from);
__raw_writel(l, to);
(char *)to += 4; (char *)from += 4; n -= 4;
}
while (odd--) {
get_user(c, (char *)from++);
writeb(c, (char *)to++);
}
}
#else /* UNSAFE_MEMCPY */
static inline void copy_from_pc(void *to, void __iomem *from, size_t n)
{
__u16 *t = to;
__u16 __iomem *f = from;
size_t odd = (n & 1);
for (n >>= 1; n; n--)
*t++ = __raw_readw(f++);
if (odd)
*(__u8 *)t = readb(f);
}
static inline void copy_to_pc(void __iomem *to, const void *from, size_t n)
{
__u16 __iomem *t = to;
const __u16 *f = from;
size_t odd = (n & 1);
for (n >>= 1; n ; n--)
__raw_writew(*f++, t++);
if (odd)
writeb(*(__u8 *)f, t);
}
static inline void copy_pc_to_user(void __user *to, void __iomem *from, size_t n)
{
__u16 __user *t = to;
__u16 __iomem *f = from;
size_t odd = (n & 1);
for (n >>= 1; n ; n--)
put_user(__raw_readw(f++), t++);
if (odd)
put_user(readb(f), (char __user *)t);
}
static inline void copy_user_to_pc(void __iomem *to, void __user *from, size_t n)
{
__u16 __user *f = from;
__u16 __iomem *t = to;
short s;
char c;
size_t odd = (n & 1);
for (n >>= 1; n; n--) {
get_user(s, f++);
__raw_writew(s, t++);
}
if (odd) {
get_user(c, (char __user *)f);
writeb(c, t);
}
}
#endif /* UNSAFE_MEMCPY */
#endif /* _LINUX_MEM_OP_H */
|