mirror of
https://github.com/drasko/codezero.git
synced 2026-01-12 10:53:16 +01:00
ede050ad37
This is one of the steps we need in the process of providing a similar interface for thread creation which can be found in the mainstream operating systems like Linux.
43 lines
852 B
C
43 lines
852 B
C
#ifndef __BIT_H__
|
|
#define __BIT_H__
|
|
|
|
unsigned int __clz(unsigned int bitvector);
|
|
int find_and_set_first_free_bit(u32 *word, unsigned int lastbit);
|
|
int find_and_set_first_free_contig_bits(u32 *word, unsigned int limit,
|
|
int nbits);
|
|
int check_and_clear_bit(u32 *word, int bit);
|
|
int check_and_clear_contig_bits(u32 *word, int first, int nbits);
|
|
|
|
int check_and_set_bit(u32 *word, int bit);
|
|
|
|
/* Set */
|
|
static inline void setbit(unsigned int *w, unsigned int flags)
|
|
{
|
|
*w |= flags;
|
|
}
|
|
|
|
|
|
/* Clear */
|
|
static inline void clrbit(unsigned int *w, unsigned int flags)
|
|
{
|
|
*w &= ~flags;
|
|
}
|
|
|
|
/* Test */
|
|
static inline int tstbit(unsigned int *w, unsigned int flags)
|
|
{
|
|
return *w & flags;
|
|
}
|
|
|
|
/* Test and clear */
|
|
static inline int tstclr(unsigned int *w, unsigned int flags)
|
|
{
|
|
int res = tstbit(w, flags);
|
|
|
|
clrbit(w, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif /* __BIT_H__ */
|