[linux-2.6-block.git] / sound / core / memory.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 * 
 *  Misc memory accessors
 */

#include <linux/export.h>
#include <linux/io.h>
#include <linux/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.
 *
 * 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)
{
#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.
 *
 * 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)
{
#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);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
c1017a4c	3	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4	4	*
e38e0cfa	5	* Misc memory accessors
1da177e4 LT	6	*/
1da177e4 LT	7
d81a6d71	8	#include <linux/export.h>
6cbbfe1c	9	#include <linux/io.h>
976412fb	10	#include <linux/uaccess.h>
9004acc7	11	#include <sound/core.h>
1da177e4	12
1da177e4 LT	13	/**
	14	* copy_to_user_fromio - copy data from mmio-space to user-space
	15	* @dst: the destination pointer on user-space
	16	* @src: the source pointer on mmio
	17	* @count: the data size to copy in bytes
	18	*
	19	* Copies the data from mmio-space to user-space.
	20	*
eb7c06e8	21	* Return: Zero if successful, or non-zero on failure.
1da177e4 LT	22	*/
	23	int copy_to_user_fromio(void __user dst, const volatile void __iomem src, size_t count)
	24	{
	25	#if defined(__i386__) \|\| defined(CONFIG_SPARC32)
4d23359b	26	return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
1da177e4 LT	27	#else
	28	char buf[256];
	29	while (count) {
	30	size_t c = count;
	31	if (c > sizeof(buf))
	32	c = sizeof(buf);
	33	memcpy_fromio(buf, (void __iomem *)src, c);
	34	if (copy_to_user(dst, buf, c))
	35	return -EFAULT;
	36	count -= c;
	37	dst += c;
	38	src += c;
	39	}
	40	return 0;
	41	#endif
	42	}
c0d3fb39 TI	43	EXPORT_SYMBOL(copy_to_user_fromio);
c0d3fb39 TI	44
1da177e4 LT	45	/**
	46	* copy_from_user_toio - copy data from user-space to mmio-space
	47	* @dst: the destination pointer on mmio-space
	48	* @src: the source pointer on user-space
	49	* @count: the data size to copy in bytes
	50	*
	51	* Copies the data from user-space to mmio-space.
	52	*
eb7c06e8	53	* Return: Zero if successful, or non-zero on failure.
1da177e4 LT	54	*/
	55	int copy_from_user_toio(volatile void __iomem dst, const void __user src, size_t count)
	56	{
	57	#if defined(__i386__) \|\| defined(CONFIG_SPARC32)
4d23359b	58	return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
1da177e4 LT	59	#else
	60	char buf[256];
	61	while (count) {
	62	size_t c = count;
	63	if (c > sizeof(buf))
	64	c = sizeof(buf);
	65	if (copy_from_user(buf, src, c))
	66	return -EFAULT;
	67	memcpy_toio(dst, buf, c);
	68	count -= c;
	69	dst += c;
	70	src += c;
	71	}
	72	return 0;
	73	#endif
	74	}
c0d3fb39	75	EXPORT_SYMBOL(copy_from_user_toio);