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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_BITOPS_OP32_H
3#define __ASM_SH_BITOPS_OP32_H
4
5#include <linux/bits.h>
6
7/*
8 * The bit modifying instructions on SH-2A are only capable of working
9 * with a 3-bit immediate, which signifies the shift position for the bit
10 * being worked on.
11 */
12#if defined(__BIG_ENDIAN)
13#define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
14#define BYTE_NUMBER(nr) ((nr ^ BITOP_LE_SWIZZLE) / BITS_PER_BYTE)
15#define BYTE_OFFSET(nr) ((nr ^ BITOP_LE_SWIZZLE) % BITS_PER_BYTE)
16#else
17#define BYTE_NUMBER(nr) ((nr) / BITS_PER_BYTE)
18#define BYTE_OFFSET(nr) ((nr) % BITS_PER_BYTE)
19#endif
20
21static __always_inline void
22arch___set_bit(unsigned long nr, volatile unsigned long *addr)
23{
24 if (__builtin_constant_p(nr)) {
25 __asm__ __volatile__ (
26 "bset.b %1, @(%O2,%0) ! __set_bit\n\t"
27 : "+r" (addr)
28 : "i" (BYTE_OFFSET(nr)), "i" (BYTE_NUMBER(nr))
29 : "t", "memory"
30 );
31 } else {
32 unsigned long mask = BIT_MASK(nr);
33 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
34
35 *p |= mask;
36 }
37}
38
39static __always_inline void
40arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
41{
42 if (__builtin_constant_p(nr)) {
43 __asm__ __volatile__ (
44 "bclr.b %1, @(%O2,%0) ! __clear_bit\n\t"
45 : "+r" (addr)
46 : "i" (BYTE_OFFSET(nr)),
47 "i" (BYTE_NUMBER(nr))
48 : "t", "memory"
49 );
50 } else {
51 unsigned long mask = BIT_MASK(nr);
52 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
53
54 *p &= ~mask;
55 }
56}
57
58/**
59 * arch___change_bit - Toggle a bit in memory
60 * @nr: the bit to change
61 * @addr: the address to start counting from
62 *
63 * Unlike change_bit(), this function is non-atomic and may be reordered.
64 * If it's called on the same region of memory simultaneously, the effect
65 * may be that only one operation succeeds.
66 */
67static __always_inline void
68arch___change_bit(unsigned long nr, volatile unsigned long *addr)
69{
70 if (__builtin_constant_p(nr)) {
71 __asm__ __volatile__ (
72 "bxor.b %1, @(%O2,%0) ! __change_bit\n\t"
73 : "+r" (addr)
74 : "i" (BYTE_OFFSET(nr)),
75 "i" (BYTE_NUMBER(nr))
76 : "t", "memory"
77 );
78 } else {
79 unsigned long mask = BIT_MASK(nr);
80 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
81
82 *p ^= mask;
83 }
84}
85
86/**
87 * arch___test_and_set_bit - Set a bit and return its old value
88 * @nr: Bit to set
89 * @addr: Address to count from
90 *
91 * This operation is non-atomic and can be reordered.
92 * If two examples of this operation race, one can appear to succeed
93 * but actually fail. You must protect multiple accesses with a lock.
94 */
95static __always_inline bool
96arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
97{
98 unsigned long mask = BIT_MASK(nr);
99 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
100 unsigned long old = *p;
101
102 *p = old | mask;
103 return (old & mask) != 0;
104}
105
106/**
107 * arch___test_and_clear_bit - Clear a bit and return its old value
108 * @nr: Bit to clear
109 * @addr: Address to count from
110 *
111 * This operation is non-atomic and can be reordered.
112 * If two examples of this operation race, one can appear to succeed
113 * but actually fail. You must protect multiple accesses with a lock.
114 */
115static __always_inline bool
116arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
117{
118 unsigned long mask = BIT_MASK(nr);
119 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
120 unsigned long old = *p;
121
122 *p = old & ~mask;
123 return (old & mask) != 0;
124}
125
126/* WARNING: non atomic and it can be reordered! */
127static __always_inline bool
128arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
129{
130 unsigned long mask = BIT_MASK(nr);
131 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
132 unsigned long old = *p;
133
134 *p = old ^ mask;
135 return (old & mask) != 0;
136}
137
138#define arch_test_bit generic_test_bit
139#define arch_test_bit_acquire generic_test_bit_acquire
140
141#include <asm-generic/bitops/non-instrumented-non-atomic.h>
142
143#endif /* __ASM_SH_BITOPS_OP32_H */
144

Warning: This file is not a C or C++ file. It does not have highlighting.

source code of linux/arch/sh/include/asm/bitops-op32.h