1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#ifndef __ASM_RISCV_BITOPS_H
19#define __ASM_RISCV_BITOPS_H
20
21#ifdef __KERNEL__
22
23#include <asm/system.h>
24#include <asm-generic/bitops/fls.h>
25#include <asm-generic/bitops/__fls.h>
26#include <asm-generic/bitops/fls64.h>
27#include <asm-generic/bitops/__ffs.h>
28
29#define smp_mb__before_clear_bit() do { } while (0)
30#define smp_mb__after_clear_bit() do { } while (0)
31
32
33
34
35static inline void __set_bit(int nr, void *addr)
36{
37 int *a = (int *)addr;
38 int mask;
39
40 a += nr >> 5;
41 mask = 1 << (nr & 0x1f);
42 *a |= mask;
43}
44
45#define PLATFORM__SET_BIT
46
47static inline void __clear_bit(int nr, void *addr)
48{
49 int *a = (int *)addr;
50 int mask;
51
52 a += nr >> 5;
53 mask = 1 << (nr & 0x1f);
54 *a &= ~mask;
55}
56
57#define PLATFORM__CLEAR_BIT
58
59static inline void __change_bit(int nr, void *addr)
60{
61 int mask;
62 unsigned long *ADDR = (unsigned long *)addr;
63
64 ADDR += nr >> 5;
65 mask = 1 << (nr & 31);
66 *ADDR ^= mask;
67}
68
69static inline int __test_and_set_bit(int nr, void *addr)
70{
71 int mask, retval;
72 unsigned int *a = (unsigned int *)addr;
73
74 a += nr >> 5;
75 mask = 1 << (nr & 0x1f);
76 retval = (mask & *a) != 0;
77 *a |= mask;
78 return retval;
79}
80
81static inline int __test_and_clear_bit(int nr, void *addr)
82{
83 int mask, retval;
84 unsigned int *a = (unsigned int *)addr;
85
86 a += nr >> 5;
87 mask = 1 << (nr & 0x1f);
88 retval = (mask & *a) != 0;
89 *a &= ~mask;
90 return retval;
91}
92
93static inline int __test_and_change_bit(int nr, void *addr)
94{
95 int mask, retval;
96 unsigned int *a = (unsigned int *)addr;
97
98 a += nr >> 5;
99 mask = 1 << (nr & 0x1f);
100 retval = (mask & *a) != 0;
101 *a ^= mask;
102 return retval;
103}
104
105
106
107
108static inline int test_bit(int nr, const void *addr)
109{
110 return ((unsigned char *)addr)[nr >> 3] & (1U << (nr & 7));
111}
112
113
114
115
116
117static inline unsigned long ffz(unsigned long word)
118{
119 int k;
120
121 word = ~word;
122 k = 31;
123 if (word & 0x0000ffff) {
124 k -= 16; word <<= 16;
125 }
126 if (word & 0x00ff0000) {
127 k -= 8; word <<= 8;
128 }
129 if (word & 0x0f000000) {
130 k -= 4; word <<= 4;
131 }
132 if (word & 0x30000000) {
133 k -= 2; word <<= 2;
134 }
135 if (word & 0x40000000)
136 k -= 1;
137
138 return k;
139}
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157#define hweight32(x) generic_hweight32(x)
158#define hweight16(x) generic_hweight16(x)
159#define hweight8(x) generic_hweight8(x)
160
161#define ext2_set_bit test_and_set_bit
162#define ext2_clear_bit test_and_clear_bit
163#define ext2_test_bit test_bit
164#define ext2_find_first_zero_bit find_first_zero_bit
165#define ext2_find_next_zero_bit find_next_zero_bit
166
167
168#define minix_test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)
169#define minix_set_bit(nr, addr) set_bit(nr, addr)
170#define minix_test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)
171#define minix_test_bit(nr, addr) test_bit(nr, addr)
172#define minix_find_first_zero_bit(addr, size) find_first_zero_bit(addr, size)
173
174#endif
175
176#endif
177