2005-04-16 16:20:36 -06:00
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/*
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2007-10-15 01:50:19 -06:00
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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2005-04-16 16:20:36 -06:00
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*
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2005-10-10 03:59:52 -06:00
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* Misc memory accessors
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2005-04-16 16:20:36 -06:00
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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2011-09-22 07:34:58 -06:00
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#include <linux/export.h>
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2005-04-16 16:20:36 -06:00
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#include <asm/io.h>
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#include <asm/uaccess.h>
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2008-01-08 10:13:27 -07:00
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#include <sound/core.h>
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2005-04-16 16:20:36 -06:00
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/**
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* copy_to_user_fromio - copy data from mmio-space to user-space
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* @dst: the destination pointer on user-space
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* @src: the source pointer on mmio
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* @count: the data size to copy in bytes
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*
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* Copies the data from mmio-space to user-space.
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*
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* Returns zero if successful, or non-zero on failure.
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*/
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int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
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{
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#if defined(__i386__) || defined(CONFIG_SPARC32)
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2005-09-05 02:35:20 -06:00
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return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0;
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2005-04-16 16:20:36 -06:00
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#else
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char buf[256];
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while (count) {
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size_t c = count;
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if (c > sizeof(buf))
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c = sizeof(buf);
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memcpy_fromio(buf, (void __iomem *)src, c);
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if (copy_to_user(dst, buf, c))
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return -EFAULT;
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count -= c;
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dst += c;
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src += c;
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}
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return 0;
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#endif
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}
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2006-04-28 07:13:39 -06:00
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EXPORT_SYMBOL(copy_to_user_fromio);
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2005-04-16 16:20:36 -06:00
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/**
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* copy_from_user_toio - copy data from user-space to mmio-space
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* @dst: the destination pointer on mmio-space
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* @src: the source pointer on user-space
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* @count: the data size to copy in bytes
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*
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* Copies the data from user-space to mmio-space.
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*
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* Returns zero if successful, or non-zero on failure.
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*/
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int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
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{
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#if defined(__i386__) || defined(CONFIG_SPARC32)
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2005-09-05 02:35:20 -06:00
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return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0;
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2005-04-16 16:20:36 -06:00
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#else
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char buf[256];
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while (count) {
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size_t c = count;
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if (c > sizeof(buf))
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c = sizeof(buf);
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if (copy_from_user(buf, src, c))
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return -EFAULT;
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memcpy_toio(dst, buf, c);
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count -= c;
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dst += c;
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src += c;
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}
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return 0;
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#endif
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}
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2006-04-28 07:13:39 -06:00
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EXPORT_SYMBOL(copy_from_user_toio);
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