| /*************************************************************************/ /*! |
| @File |
| @Title Utility functions for user space access |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @License Dual MIT/GPLv2 |
| |
| The contents of this file are subject to the MIT license as set out below. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), to deal |
| in the Software without restriction, including without limitation the rights |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| copies of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included in |
| all copies or substantial portions of the Software. |
| |
| Alternatively, the contents of this file may be used under the terms of |
| the GNU General Public License Version 2 ("GPL") in which case the provisions |
| of GPL are applicable instead of those above. |
| |
| If you wish to allow use of your version of this file only under the terms of |
| GPL, and not to allow others to use your version of this file under the terms |
| of the MIT license, indicate your decision by deleting the provisions above |
| and replace them with the notice and other provisions required by GPL as set |
| out in the file called "GPL-COPYING" included in this distribution. If you do |
| not delete the provisions above, a recipient may use your version of this file |
| under the terms of either the MIT license or GPL. |
| |
| This License is also included in this distribution in the file called |
| "MIT-COPYING". |
| |
| EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS |
| PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
| BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
| PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR |
| COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ /**************************************************************************/ |
| #ifndef __PVR_UACCESS_H__ |
| #define __PVR_UACCESS_H__ |
| |
| #include <linux/uaccess.h> |
| #include <linux/version.h> |
| |
| static inline unsigned long pvr_copy_to_user(void __user *pvTo, const void *pvFrom, unsigned long ulBytes) |
| { |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)) |
| if (access_ok(VERIFY_WRITE, pvTo, ulBytes)) |
| #else |
| if (access_ok(pvTo, ulBytes)) |
| #endif |
| { |
| return __copy_to_user(pvTo, pvFrom, ulBytes); |
| } |
| |
| return ulBytes; |
| } |
| |
| |
| #if defined(__KLOCWORK__) |
| /* this part is only to tell Klocwork not to report false positive because |
| it doesn't understand that pvr_copy_from_user will initialise the memory |
| pointed to by pvTo */ |
| #include <linux/string.h> /* get the memset prototype */ |
| static inline unsigned long pvr_copy_from_user(void *pvTo, const void __user *pvFrom, unsigned long ulBytes) |
| { |
| if (pvTo != NULL) |
| { |
| memset(pvTo, 0xAA, ulBytes); |
| return 0; |
| } |
| return 1; |
| } |
| |
| #else /* real implementation */ |
| |
| static inline unsigned long pvr_copy_from_user(void *pvTo, const void __user *pvFrom, unsigned long ulBytes) |
| { |
| /* |
| * The compile time correctness checking introduced for copy_from_user in |
| * Linux 2.6.33 isn't fully compatible with our usage of the function. |
| */ |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0)) |
| if (access_ok(VERIFY_READ, pvFrom, ulBytes)) |
| #else |
| if (access_ok(pvFrom, ulBytes)) |
| #endif |
| { |
| return __copy_from_user(pvTo, pvFrom, ulBytes); |
| } |
| |
| return ulBytes; |
| } |
| #endif /* klocworks */ |
| |
| #endif /* __PVR_UACCESS_H__ */ |