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139 lines
4.0 KiB
139 lines
4.0 KiB
1 year ago
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/*
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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_bitmap.h"
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#include "los_printf.h"
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#include "los_toolchain.h"
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#define OS_BITMAP_MASK 0x1FU
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#define OS_BITMAP_WORD_MASK ~0UL
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/* find first zero bit starting from LSB */
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STATIC INLINE UINT16 Ffz(UINTPTR x)
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{
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return __builtin_ffsl(~x) - 1;
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}
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VOID LOS_BitmapSet(UINT32 *bitmap, UINT16 pos)
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{
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if (bitmap == NULL) {
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return;
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}
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*bitmap |= 1U << (pos & OS_BITMAP_MASK);
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}
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VOID LOS_BitmapClr(UINT32 *bitmap, UINT16 pos)
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{
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if (bitmap == NULL) {
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return;
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}
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*bitmap &= ~(1U << (pos & OS_BITMAP_MASK));
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}
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UINT16 LOS_HighBitGet(UINT32 bitmap)
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{
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if (bitmap == 0) {
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return LOS_INVALID_BIT_INDEX;
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}
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return (OS_BITMAP_MASK - CLZ(bitmap));
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}
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UINT16 LOS_LowBitGet(UINT32 bitmap)
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{
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if (bitmap == 0) {
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return LOS_INVALID_BIT_INDEX;
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}
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return CTZ(bitmap);
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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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UINTPTR *p = bitmap + BITMAP_WORD(start);
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const UINT32 size = start + numsSet;
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UINT16 bitsToSet = BITMAP_BITS_PER_WORD - (start % BITMAP_BITS_PER_WORD);
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UINTPTR maskToSet = BITMAP_FIRST_WORD_MASK(start);
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while (numsSet > bitsToSet) {
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*p |= maskToSet;
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numsSet -= bitsToSet;
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bitsToSet = BITMAP_BITS_PER_WORD;
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maskToSet = OS_BITMAP_WORD_MASK;
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p++;
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}
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if (numsSet) {
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maskToSet &= BITMAP_LAST_WORD_MASK(size);
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*p |= maskToSet;
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}
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}
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VOID LOS_BitmapClrNBits(UINTPTR *bitmap, UINT32 start, UINT32 numsClear)
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{
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UINTPTR *p = bitmap + BITMAP_WORD(start);
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const UINT32 size = start + numsClear;
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UINT16 bitsToClear = BITMAP_BITS_PER_WORD - (start % BITMAP_BITS_PER_WORD);
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UINTPTR maskToClear = BITMAP_FIRST_WORD_MASK(start);
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while (numsClear >= bitsToClear) {
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*p &= ~maskToClear;
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numsClear -= bitsToClear;
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bitsToClear = BITMAP_BITS_PER_WORD;
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maskToClear = OS_BITMAP_WORD_MASK;
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p++;
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}
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if (numsClear) {
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maskToClear &= BITMAP_LAST_WORD_MASK(size);
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*p &= ~maskToClear;
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}
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}
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INT32 LOS_BitmapFfz(UINTPTR *bitmap, UINT32 numBits)
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{
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INT32 bit, i;
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for (i = 0; i < BITMAP_NUM_WORDS(numBits); i++) {
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if (bitmap[i] == OS_BITMAP_WORD_MASK) {
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continue;
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}
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bit = i * BITMAP_BITS_PER_WORD + Ffz(bitmap[i]);
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if (bit < numBits) {
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return bit;
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}
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return -1;
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}
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return -1;
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}
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