memory.c

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/*
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 * 
 *  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/export.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <sound/core.h>

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);

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);