2 * Copyright (C) 2013 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_WORD_AT_A_TIME_H
17 #define __ASM_WORD_AT_A_TIME_H
21 #include <linux/kernel.h>
23 struct word_at_a_time {
24 const unsigned long one_bits, high_bits;
27 #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }
29 static inline unsigned long has_zero(unsigned long a, unsigned long *bits,
30 const struct word_at_a_time *c)
32 unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits;
37 #define prep_zero_mask(a, bits, c) (bits)
39 static inline unsigned long create_zero_mask(unsigned long bits)
41 bits = (bits - 1) & ~bits;
45 static inline unsigned long find_zero(unsigned long mask)
47 return fls64(mask) >> 3;
50 #else /* __AARCH64EB__ */
51 #include <asm-generic/word-at-a-time.h>
54 #endif /* __ASM_WORD_AT_A_TIME_H */