root/sound/core/memory.c

DEFINITIONS

1. copy_to_user_fromio
2. copy_from_user_toio

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <asm/io.h>
#include <asm/uaccess.h>
#include <sound/core.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);