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

/*
 *  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 <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
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4	3	*
e38e0cfa	4	* Misc memory accessors
1da177e4 LT	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22
d81a6d71	23	#include <linux/export.h>
6cbbfe1c	24	#include <linux/io.h>
976412fb	25	#include <linux/uaccess.h>
9004acc7	26	#include <sound/core.h>
1da177e4	27
1da177e4 LT	28	/**
	29	* copy_to_user_fromio - copy data from mmio-space to user-space
	30	* @dst: the destination pointer on user-space
	31	* @src: the source pointer on mmio
	32	* @count: the data size to copy in bytes
	33	*
	34	* Copies the data from mmio-space to user-space.
	35	*
eb7c06e8	36	* Return: Zero if successful, or non-zero on failure.
1da177e4 LT	37	*/
	38	int copy_to_user_fromio(void __user dst, const volatile void __iomem src, size_t count)
	39	{
	40	#if defined(__i386__) \|\| defined(CONFIG_SPARC32)
4d23359b	41	return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
1da177e4 LT	42	#else
	43	char buf[256];
	44	while (count) {
	45	size_t c = count;
	46	if (c > sizeof(buf))
	47	c = sizeof(buf);
	48	memcpy_fromio(buf, (void __iomem *)src, c);
	49	if (copy_to_user(dst, buf, c))
	50	return -EFAULT;
	51	count -= c;
	52	dst += c;
	53	src += c;
	54	}
	55	return 0;
	56	#endif
	57	}
	58
c0d3fb39 TI	59	EXPORT_SYMBOL(copy_to_user_fromio);
c0d3fb39 TI	60
1da177e4 LT	61	/**
	62	* copy_from_user_toio - copy data from user-space to mmio-space
	63	* @dst: the destination pointer on mmio-space
	64	* @src: the source pointer on user-space
	65	* @count: the data size to copy in bytes
	66	*
	67	* Copies the data from user-space to mmio-space.
	68	*
eb7c06e8	69	* Return: Zero if successful, or non-zero on failure.
1da177e4 LT	70	*/
	71	int copy_from_user_toio(volatile void __iomem dst, const void __user src, size_t count)
	72	{
	73	#if defined(__i386__) \|\| defined(CONFIG_SPARC32)
4d23359b	74	return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
1da177e4 LT	75	#else
	76	char buf[256];
	77	while (count) {
	78	size_t c = count;
	79	if (c > sizeof(buf))
	80	c = sizeof(buf);
	81	if (copy_from_user(buf, src, c))
	82	return -EFAULT;
	83	memcpy_toio(dst, buf, c);
	84	count -= c;
	85	dst += c;
	86	src += c;
	87	}
	88	return 0;
	89	#endif
	90	}
c0d3fb39 TI	91
c0d3fb39 TI	92	EXPORT_SYMBOL(copy_from_user_toio);