21 lines
869 B
C
21 lines
869 B
C
#ifndef _BITMAP_H
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#define _BITMAP_H
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/* Bit map operations to manipulate bits of a simple mask variable. */
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#define bit_set(mask, n) ((mask) |= (1 << (n)))
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#define bit_unset(mask, n) ((mask) &= ~(1 << (n)))
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#define bit_isset(mask, n) ((mask) & (1 << (n)))
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#define bit_empty(mask) ((mask) = 0)
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#define bit_fill(mask) ((mask) = ~0)
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/* Definitions previously in kernel/const.h */
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#define BITCHUNK_BITS (sizeof(bitchunk_t) * CHAR_BIT)
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#define BITMAP_CHUNKS(nr_bits) (((nr_bits)+BITCHUNK_BITS-1)/BITCHUNK_BITS)
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#define MAP_CHUNK(map,bit) (map)[((bit)/BITCHUNK_BITS)]
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#define CHUNK_OFFSET(bit) ((bit)%BITCHUNK_BITS)
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#define GET_BIT(map,bit) ( MAP_CHUNK(map,bit) & (1 << CHUNK_OFFSET(bit) ))
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#define SET_BIT(map,bit) ( MAP_CHUNK(map,bit) |= (1 << CHUNK_OFFSET(bit) ))
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#define UNSET_BIT(map,bit) ( MAP_CHUNK(map,bit) &= ~(1 << CHUNK_OFFSET(bit) ))
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#endif /* _BITMAP_H */
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