104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "los_typedef.h"
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#pragma once
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/*
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* @brief Copy data from userspace into kernelspace
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*
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* This function validates that usermode has access to src before copying the
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* data.
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*
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* @param dst The destination buffer.
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* @param src The source buffer.
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* @param len The number of bytes to copy.
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*
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* @return bytes not copied
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*/
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size_t LOS_ArchCopyFromUser(void *dst, const void *src, size_t len);
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/*
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* @brief Copy data from kernelspace into userspace
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*
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* This function validates that usermode has access to dst before copying the
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* data.
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*
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* @param dst The destination buffer.
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* @param src The source buffer.
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* @param len The number of bytes to copy.
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*
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* @return bytes not copied
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*/
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size_t LOS_ArchCopyToUser(void *dst, const void *src, size_t len);
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/*
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* @brief Copy data from src to dst
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*
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* This function will use different copy methods to copy src data to dst, according to
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* the different spaces (userspace or kernelspace) of dst data.
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*
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* @param dst The destination buffer, can be userspace address.
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* @param max The maxsimum number of bytes to copy.
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* @param src The source buffer.
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* @param len The number of bytes to copy.
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*
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* @return zero on success; non-zero on failure.
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*/
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INT32 LOS_CopyFromKernel(VOID *dest, UINT32 max, const VOID *src, UINT32 count);
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/*
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* @brief Copy data from src to dst
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*
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* This function will use different copy methods to copy src data to dst, according to
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* the different spaces (userspace or kernelspace) of src data.
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*
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* @param dst The destination buffer.
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* @param max The maxsimum number of bytes to copy.
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* @param src The source buffer, can be userspace address.
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* @param len The number of bytes to copy.
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*
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* @return zero on success; non-zero on failure.
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*/
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INT32 LOS_CopyToKernel(VOID *dest, UINT32 max, const VOID *src, UINT32 count);
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/*
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* @brief Clear data in buf
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*
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* This function will clear buf from buf to buf + len.
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*
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* @param buf The destination buffer, can be userspace address.
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* @param len The number of bytes to clear.
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*
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* @return zero on success; non-zero on failure.
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*/
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INT32 LOS_UserMemClear(unsigned char *buf, UINT32 len);
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