1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2012 Regents of the University of California
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Derived from arch/x86/include/asm/word-at-a-time.h
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #ifndef _ASM_RISCV_WORD_AT_A_TIME_H
9*4882a593Smuzhiyun #define _ASM_RISCV_WORD_AT_A_TIME_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct word_at_a_time {
15*4882a593Smuzhiyun const unsigned long one_bits, high_bits;
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }
19*4882a593Smuzhiyun
has_zero(unsigned long val,unsigned long * bits,const struct word_at_a_time * c)20*4882a593Smuzhiyun static inline unsigned long has_zero(unsigned long val,
21*4882a593Smuzhiyun unsigned long *bits, const struct word_at_a_time *c)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits;
24*4882a593Smuzhiyun *bits = mask;
25*4882a593Smuzhiyun return mask;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
prep_zero_mask(unsigned long val,unsigned long bits,const struct word_at_a_time * c)28*4882a593Smuzhiyun static inline unsigned long prep_zero_mask(unsigned long val,
29*4882a593Smuzhiyun unsigned long bits, const struct word_at_a_time *c)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun return bits;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
create_zero_mask(unsigned long bits)34*4882a593Smuzhiyun static inline unsigned long create_zero_mask(unsigned long bits)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun bits = (bits - 1) & ~bits;
37*4882a593Smuzhiyun return bits >> 7;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
find_zero(unsigned long mask)40*4882a593Smuzhiyun static inline unsigned long find_zero(unsigned long mask)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun return fls64(mask) >> 3;
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
48*4882a593Smuzhiyun #endif /* _ASM_RISCV_WORD_AT_A_TIME_H */
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