linux/sound/core/memory.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 * 
 *  Misc memory accessors
 */

#include <linux/export.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <sound/core.h>
#include <sound/pcm.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.
 *
 * Return: Zero if successful, or non-zero on failure.
 */
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
{ … }
EXPORT_SYMBOL(…);

/**
 * copy_to_iter_fromio - copy data from mmio-space to iov_iter
 * @dst: the destination iov_iter
 * @src: the source pointer on mmio
 * @count: the data size to copy in bytes
 *
 * Copies the data from mmio-space to iov_iter.
 *
 * Return: Zero if successful, or non-zero on failure.
 */
int copy_to_iter_fromio(struct iov_iter *dst, const void __iomem *src,
			size_t count)
{ … }
EXPORT_SYMBOL(…);

/**
 * 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.
 *
 * Return: Zero if successful, or non-zero on failure.
 */
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
{ … }
EXPORT_SYMBOL(…);

/**
 * copy_from_iter_toio - copy data from iov_iter to mmio-space
 * @dst: the destination pointer on mmio-space
 * @src: the source iov_iter
 * @count: the data size to copy in bytes
 *
 * Copies the data from iov_iter to mmio-space.
 *
 * Return: Zero if successful, or non-zero on failure.
 */
int copy_from_iter_toio(void __iomem *dst, struct iov_iter *src, size_t count)
{ … }
EXPORT_SYMBOL(…);