1 #ifndef _ASM_WORD_AT_A_TIME_H
2 #define _ASM_WORD_AT_A_TIME_H
5 * This says "generic", but it's actually big-endian only.
6 * Little-endian can use more efficient versions of these
7 * interfaces, see for example
8 * arch/x86/include/asm/word-at-a-time.h
12 #include <linux/kernel.h>
14 struct word_at_a_time
{
15 const unsigned long high_bits
, low_bits
;
18 #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0xfe) + 1, REPEAT_BYTE(0x7f) }
20 /* Bit set in the bytes that have a zero */
21 static inline long prep_zero_mask(unsigned long val
, unsigned long rhs
, const struct word_at_a_time
*c
)
23 unsigned long mask
= (val
& c
->low_bits
) + c
->low_bits
;
27 #define create_zero_mask(mask) (mask)
29 static inline long find_zero(unsigned long mask
)
42 return (mask
>> 8) ? byte
: byte
+ 1;
45 static inline bool has_zero(unsigned long val
, unsigned long *data
, const struct word_at_a_time
*c
)
47 unsigned long rhs
= val
| c
->low_bits
;
49 return (val
+ c
->high_bits
) & ~rhs
;
52 #endif /* _ASM_WORD_AT_A_TIME_H */
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