1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __ASM_SH_WORD_AT_A_TIME_H
3*4882a593Smuzhiyun #define __ASM_SH_WORD_AT_A_TIME_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #ifdef CONFIG_CPU_BIG_ENDIAN
6*4882a593Smuzhiyun # include <asm-generic/word-at-a-time.h>
7*4882a593Smuzhiyun #else
8*4882a593Smuzhiyun /*
9*4882a593Smuzhiyun * Little-endian version cribbed from x86.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun struct word_at_a_time {
12*4882a593Smuzhiyun const unsigned long one_bits, high_bits;
13*4882a593Smuzhiyun };
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* Carl Chatfield / Jan Achrenius G+ version for 32-bit */
count_masked_bytes(long mask)18*4882a593Smuzhiyun static inline long count_masked_bytes(long mask)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */
21*4882a593Smuzhiyun long a = (0x0ff0001+mask) >> 23;
22*4882a593Smuzhiyun /* Fix the 1 for 00 case */
23*4882a593Smuzhiyun return a & mask;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* Return nonzero if it has a zero */
has_zero(unsigned long a,unsigned long * bits,const struct word_at_a_time * c)27*4882a593Smuzhiyun static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits;
30*4882a593Smuzhiyun *bits = mask;
31*4882a593Smuzhiyun return mask;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
prep_zero_mask(unsigned long a,unsigned long bits,const struct word_at_a_time * c)34*4882a593Smuzhiyun static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun return bits;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
create_zero_mask(unsigned long bits)39*4882a593Smuzhiyun static inline unsigned long create_zero_mask(unsigned long bits)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun bits = (bits - 1) & ~bits;
42*4882a593Smuzhiyun return bits >> 7;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* The mask we created is directly usable as a bytemask */
46*4882a593Smuzhiyun #define zero_bytemask(mask) (mask)
47*4882a593Smuzhiyun
find_zero(unsigned long mask)48*4882a593Smuzhiyun static inline unsigned long find_zero(unsigned long mask)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun return count_masked_bytes(mask);
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun #endif
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #endif
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