60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __BITS_H
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#define __BITS_H
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#include <arch/ops.h>
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#define clz(x) __builtin_clz(x)
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#define BIT(x, bit) ((x) & (1 << (bit)))
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#define BIT_SHIFT(x, bit) (((x) >> (bit)) & 1)
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#define BITS(x, high, low) ((x) & (((1<<((high)+1))-1) & ~((1<<(low))-1)))
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#define BITS_SHIFT(x, high, low) (((x) >> (low)) & ((1<<((high)-(low)+1))-1))
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#define BIT_SET(x, bit) (((x) & (1 << (bit))) ? 1 : 0)
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#define BITMAP_BITS_PER_WORD (sizeof(unsigned long) * 8)
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#define BITMAP_NUM_WORDS(x) (((x) / BITMAP_BITS_PER_WORD) + 1)
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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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static inline int bitmap_set(unsigned long *bitmap, int bit)
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{
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unsigned long mask = 1 << BITMAP_BIT_IN_WORD(bit);
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return atomic_or((int*)&bitmap[BITMAP_WORD(bit)], mask) & mask ? 1 : 0;
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}
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static inline int bitmap_clear(unsigned long *bitmap, int bit)
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{
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unsigned long mask = 1 << BITMAP_BIT_IN_WORD(bit);
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return atomic_and((int*)&bitmap[BITMAP_WORD(bit)], ~mask) & mask ? 1:0;
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}
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static inline int bitmap_test(unsigned long *bitmap, int bit)
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{
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return BIT_SET(bitmap[BITMAP_WORD(bit)], BITMAP_BIT_IN_WORD(bit));
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}
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#endif
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