Introduce new API to test if a fixed number of bits is clear or set, and clear or set them all at once.
The caller has to make sure the input bitnumber is a multiply of BITS_PER_LONG. This API avoids the loop over each bit in a known range just to see if all of them are either clear or set. Signed-off-by: Olaf Hering <[email protected]> --- tools/libs/ctrl/xc_bitops.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/libs/ctrl/xc_bitops.h b/tools/libs/ctrl/xc_bitops.h index f0bac4a071..92f38872fb 100644 --- a/tools/libs/ctrl/xc_bitops.h +++ b/tools/libs/ctrl/xc_bitops.h @@ -77,4 +77,29 @@ static inline void bitmap_or(void *_dst, const void *_other, dst[i] |= other[i]; } +static inline int test_bit_long_set(unsigned long nr_base, const void *_addr) +{ + const unsigned long *addr = _addr; + unsigned long val = addr[nr_base / BITS_PER_LONG]; + return val == ~0; +} + +static inline int test_bit_long_clear(unsigned long nr_base, const void *_addr) +{ + const unsigned long *addr = _addr; + unsigned long val = addr[nr_base / BITS_PER_LONG]; + return val == 0; +} + +static inline void clear_bit_long(unsigned long nr_base, void *_addr) +{ + unsigned long *addr = _addr; + addr[nr_base / BITS_PER_LONG] = 0; +} + +static inline void set_bit_long(unsigned long nr_base, void *_addr) +{ + unsigned long *addr = _addr; + addr[nr_base / BITS_PER_LONG] = ~0; +} #endif /* XC_BITOPS_H */
