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/*

 * 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 */