223 lines
7.2 KiB
C
223 lines
7.2 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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/**
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* @defgroup los_bitmap Bitmap
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* @ingroup kernel
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*/
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#ifndef _LOS_BITMAP_H
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#define _LOS_BITMAP_H
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#include "los_typedef.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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/* Trick to get a 1 of the right size */
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#define _ONE(x) (1 + ((x) - (x)))
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#define BIT(n) (1U << (n))
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#define BIT_GET(x, bit) ((x) & (_ONE(x) << (bit)))
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#define BIT_SHIFT(x, bit) (((x) >> (bit)) & 1)
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#define BITS_GET(x, high, low) ((x) & (((_ONE(x) << ((high) + 1)) - 1) & ~((_ONE(x) << (low)) - 1)))
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#define BITS_SHIFT(x, high, low) (((x) >> (low)) & ((_ONE(x) << ((high) - (low) + 1)) - 1))
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#define BIT_SET(x, bit) (((x) & (_ONE(x) << (bit))) ? 1 : 0)
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#define BITMAP_BITS_PER_WORD (sizeof(UINTPTR) * 8)
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#define BITMAP_NUM_WORDS(x) (((x) + BITMAP_BITS_PER_WORD - 1) / BITMAP_BITS_PER_WORD)
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#define BITMAP_WORD(x) ((x) / BITMAP_BITS_PER_WORD)
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#define BITMAP_BIT_IN_WORD(x) ((x) & (BITMAP_BITS_PER_WORD - 1))
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#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITMAP_BITS_PER_WORD))
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#define BITMAP_LAST_WORD_MASK(nbits) \
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(((nbits) % BITMAP_BITS_PER_WORD) ? (1UL << ((nbits) % BITMAP_BITS_PER_WORD)) - 1 : ~0UL)
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#define BITMAP_BITS_PER_INT (sizeof(INTPTR) * 8)
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#define BITMAP_BIT_IN_INT(x) ((x) & (BITMAP_BITS_PER_INT - 1))
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#define BITMAP_INT(x) ((x) / BITMAP_BITS_PER_INT)
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#define BIT_MASK(x) (((x) >= sizeof(UINTPTR) * 8) ? (0UL - 1) : ((1UL << (x)) - 1))
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/**
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* @ingroup los_bitmap
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* Flag that indicates the invalid bit index.
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*
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* The effective bit index is from 0 to 31.
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*/
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#define LOS_INVALID_BIT_INDEX 32
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/**
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* @ingroup los_bitmap
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* @brief Set one bit.
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*
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* @par Description:
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* This API is used to set one bit of variable according to the parameter.
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* @attention
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* <ul>
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* <li>When the value of pos is greater than 31, the bit (pos & 0x1f) of bitmap will be set.</li>
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* </ul>
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* @param bitmap [IN] The bitmap variable pointer.
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* @param pos [IN] The number bit to be set.
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*
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* @retval None
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_BitmapClr
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*/
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VOID LOS_BitmapSet(UINT32 *bitmap, UINT16 pos);
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/**
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* @ingroup los_bitmap
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* @brief Clear one bit.
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*
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* @par Description:
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* This API is used to clear one bit of variable according to the parameter.
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* @attention
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* <ul>
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* <li>When the value of pos is greater than 31, the bit (pos & 0x1f) of bitmap will be clear.</li>
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* </ul>
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* @param bitmap [IN] The bitmap variable pointer.
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* @param pos [IN] The number bit to be cleared.
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*
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* @retval none.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_BitmapSet.
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*/
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VOID LOS_BitmapClr(UINT32 *bitmap, UINT16 pos);
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/**
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* @ingroup los_bitmap
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* @brief Find the lowest one bit that is set.
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*
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* @par Description:
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* This API is used to find the lowest one bit that is set and return the bit index.
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* @attention
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* <ul>
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* <li>None</li>
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* </ul>
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* @param bitmap [IN] The bitmap variable.
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*
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* @retval UINT16 The bit index of the lowest one bit that is set.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_HighBitGet
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*/
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UINT16 LOS_LowBitGet(UINT32 bitmap);
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/**
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* @ingroup los_bitmap
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* @brief Find the highest one bit that is set.
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*
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* @par Description:
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* This API is used to find the highest one bit that is set and return the bit index.
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* @attention
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* <ul>
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* <li>None</li>
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* </ul>
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* @param bitmap [IN] The bitmap variable.
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*
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* @retval UINT16 The bit index of the highest one bit that is set.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_LowBitGet
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*/
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UINT16 LOS_HighBitGet(UINT32 bitmap);
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/**
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* @ingroup los_bitmap
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* @brief Find the first zero bit starting from LSB.
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*
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* @par Description:
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* This API is used to find the first zero bit starting from LSB and return the bit index.
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* @attention
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* <ul>
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* <li>None</li>
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* </ul>
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* @param *bitmap [IN] The bitmap pointer.
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* @param numBits [IN] The number of bits that is used to limit the bitmap range.
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*
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* @retval int The bit index of the first zero bit from LSB.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_BitmapFfz
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*/
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int LOS_BitmapFfz(UINTPTR *bitmap, UINT32 numBits);
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/**
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* @ingroup los_bitmap
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* @brief Set the number of bit to 1 from start.
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*
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* @par Description:
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* This API is used to set the number of bit to 1 from start.
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* @attention
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* <ul>
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* <li>None</li>
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* </ul>
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* @param *bitmap [IN] The bitmap pointer.
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* @param start [IN] The start bit.
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* @param numsSet [IN] The number of set bits
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*
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* @retval none.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_BitmapSetNBits
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*/
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VOID LOS_BitmapSetNBits(UINTPTR *bitmap, UINT32 start, UINT32 numsSet);
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/**
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* @ingroup los_bitmap
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* @brief Clear the number of bit to zero from start.
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*
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* @par Description:
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* This API is used to set the number of bit to zero from start.
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* @attention
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* <ul>
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* <li>None</li>
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* </ul>
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* @param *bitmap [IN] The bitmap pointer.
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* @param start [IN] The start bit.
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* @param numsClear [IN] The number of clear bits
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*
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* @retval none.
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* @par Dependency:
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* <ul><li>los_bitmap.h: the header file that contains the API declaration.</li></ul>
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* @see LOS_BitmapClrNBits
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*/
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VOID LOS_BitmapClrNBits(UINTPTR *bitmap, UINT32 start, UINT32 numsClear);
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* _LOS_BITMAP_H */
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