/*************************************************************************/ /*!
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@File
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@Title Utility functions for user space access
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@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
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@License Dual MIT/GPLv2
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The contents of this file are subject to the MIT license as set out below.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 2 ("GPL") in which case the provisions
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of GPL are applicable instead of those above.
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If you wish to allow use of your version of this file only under the terms of
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GPL, and not to allow others to use your version of this file under the terms
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of the MIT license, indicate your decision by deleting the provisions above
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and replace them with the notice and other provisions required by GPL as set
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out in the file called "GPL-COPYING" included in this distribution. If you do
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not delete the provisions above, a recipient may use your version of this file
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under the terms of either the MIT license or GPL.
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This License is also included in this distribution in the file called
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"MIT-COPYING".
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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
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PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/ /**************************************************************************/
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#ifndef __PVR_UACCESS_H__
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#define __PVR_UACCESS_H__
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#include <linux/uaccess.h>
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static inline unsigned long pvr_copy_to_user(void __user *pvTo, const void *pvFrom, unsigned long ulBytes)
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{
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if (access_ok(VERIFY_WRITE, pvTo, ulBytes))
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{
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return __copy_to_user(pvTo, pvFrom, ulBytes);
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}
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return ulBytes;
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}
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#if defined(__KLOCWORK__)
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/* this part is only to tell Klocwork not to report false positive because
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it doesn't understand that pvr_copy_from_user will initialise the memory
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pointed to by pvTo */
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#include <linux/string.h> /* get the memset prototype */
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static inline unsigned long pvr_copy_from_user(void *pvTo, const void __user *pvFrom, unsigned long ulBytes)
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{
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if (pvTo != NULL)
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{
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memset(pvTo, 0xAA, ulBytes);
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return 0;
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}
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return 1;
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}
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#else /* real implementation */
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static inline unsigned long pvr_copy_from_user(void *pvTo, const void __user *pvFrom, unsigned long ulBytes)
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{
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/*
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* The compile time correctness checking introduced for copy_from_user in
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* Linux 2.6.33 isn't fully compatible with our usage of the function.
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*/
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if (access_ok(VERIFY_READ, pvFrom, ulBytes))
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{
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return __copy_from_user(pvTo, pvFrom, ulBytes);
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}
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return ulBytes;
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}
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#endif /* klocworks */
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#endif /* __PVR_UACCESS_H__ */
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