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877b2cedc7
A 16-bit device number or id further distinguishes a device on the system in addition to the device type. This is meant to be used for the very first identification of the device for further probing. Any further info is available by userspace mapping and probing.
45 lines
878 B
C
45 lines
878 B
C
#ifndef __BIT_H__
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#define __BIT_H__
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#include <l4lib/types.h>
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unsigned int __clz(unsigned int bitvector);
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int find_and_set_first_free_bit(u32 *word, unsigned int lastbit);
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int find_and_set_first_free_contig_bits(u32 *word, unsigned int limit,
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int nbits);
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int check_and_clear_bit(u32 *word, int bit);
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int check_and_clear_contig_bits(u32 *word, int first, int nbits);
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int check_and_set_bit(u32 *word, int bit);
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/* Set */
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static inline void setbit(unsigned int *w, unsigned int flags)
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{
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*w |= flags;
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}
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/* Clear */
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static inline void clrbit(unsigned int *w, unsigned int flags)
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{
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*w &= ~flags;
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}
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/* Test */
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static inline int tstbit(unsigned int *w, unsigned int flags)
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{
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return *w & flags;
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}
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/* Test and clear */
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static inline int tstclr(unsigned int *w, unsigned int flags)
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{
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int res = tstbit(w, flags);
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clrbit(w, flags);
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return res;
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}
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#endif /* __BIT_H__ */
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