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1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_BITOPS_32_H
16#define _ASM_TILE_BITOPS_32_H
17
18#include <linux/compiler.h>
19#include <linux/atomic.h>
20
21/* Tile-specific routines to support <asm/bitops.h>. */
22unsigned long _atomic_or(volatile unsigned long *p, unsigned long mask);
23unsigned long _atomic_andn(volatile unsigned long *p, unsigned long mask);
24unsigned long _atomic_xor(volatile unsigned long *p, unsigned long mask);
25
26/**
27 * set_bit - Atomically set a bit in memory
28 * @nr: the bit to set
29 * @addr: the address to start counting from
30 *
31 * This function is atomic and may not be reordered.
32 * See __set_bit() if you do not require the atomic guarantees.
33 * Note that @nr may be almost arbitrarily large; this function is not
34 * restricted to acting on a single-word quantity.
35 */
36static inline void set_bit(unsigned nr, volatile unsigned long *addr)
37{
38 _atomic_or(addr + BIT_WORD(nr), BIT_MASK(nr));
39}
40
41/**
42 * clear_bit - Clears a bit in memory
43 * @nr: Bit to clear
44 * @addr: Address to start counting from
45 *
46 * clear_bit() is atomic and may not be reordered.
47 * See __clear_bit() if you do not require the atomic guarantees.
48 * Note that @nr may be almost arbitrarily large; this function is not
49 * restricted to acting on a single-word quantity.
50 *
51 * clear_bit() may not contain a memory barrier, so if it is used for
52 * locking purposes, you should call smp_mb__before_clear_bit() and/or
53 * smp_mb__after_clear_bit() to ensure changes are visible on other cpus.
54 */
55static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
56{
57 _atomic_andn(addr + BIT_WORD(nr), BIT_MASK(nr));
58}
59
60/**
61 * change_bit - Toggle a bit in memory
62 * @nr: Bit to change
63 * @addr: Address to start counting from
64 *
65 * change_bit() is atomic and may not be reordered.
66 * See __change_bit() if you do not require the atomic guarantees.
67 * Note that @nr may be almost arbitrarily large; this function is not
68 * restricted to acting on a single-word quantity.
69 */
70static inline void change_bit(unsigned nr, volatile unsigned long *addr)
71{
72 _atomic_xor(addr + BIT_WORD(nr), BIT_MASK(nr));
73}
74
75/**
76 * test_and_set_bit - Set a bit and return its old value
77 * @nr: Bit to set
78 * @addr: Address to count from
79 *
80 * This operation is atomic and cannot be reordered.
81 * It also implies a memory barrier.
82 */
83static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
84{
85 unsigned long mask = BIT_MASK(nr);
86 addr += BIT_WORD(nr);
87 smp_mb(); /* barrier for proper semantics */
88 return (_atomic_or(addr, mask) & mask) != 0;
89}
90
91/**
92 * test_and_clear_bit - Clear a bit and return its old value
93 * @nr: Bit to clear
94 * @addr: Address to count from
95 *
96 * This operation is atomic and cannot be reordered.
97 * It also implies a memory barrier.
98 */
99static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
100{
101 unsigned long mask = BIT_MASK(nr);
102 addr += BIT_WORD(nr);
103 smp_mb(); /* barrier for proper semantics */
104 return (_atomic_andn(addr, mask) & mask) != 0;
105}
106
107/**
108 * test_and_change_bit - Change a bit and return its old value
109 * @nr: Bit to change
110 * @addr: Address to count from
111 *
112 * This operation is atomic and cannot be reordered.
113 * It also implies a memory barrier.
114 */
115static inline int test_and_change_bit(unsigned nr,
116 volatile unsigned long *addr)
117{
118 unsigned long mask = BIT_MASK(nr);
119 addr += BIT_WORD(nr);
120 smp_mb(); /* barrier for proper semantics */
121 return (_atomic_xor(addr, mask) & mask) != 0;
122}
123
124/* See discussion at smp_mb__before_atomic_dec() in <asm/atomic_32.h>. */
125#define smp_mb__before_clear_bit() smp_mb()
126#define smp_mb__after_clear_bit() do {} while (0)
127
128#include <asm-generic/bitops/ext2-atomic.h>
129
130#endif /* _ASM_TILE_BITOPS_32_H */
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_BITOPS_32_H
16#define _ASM_TILE_BITOPS_32_H
17
18#include <linux/compiler.h>
19#include <linux/atomic.h>
20#include <asm/system.h>
21
22/* Tile-specific routines to support <asm/bitops.h>. */
23unsigned long _atomic_or(volatile unsigned long *p, unsigned long mask);
24unsigned long _atomic_andn(volatile unsigned long *p, unsigned long mask);
25unsigned long _atomic_xor(volatile unsigned long *p, unsigned long mask);
26
27/**
28 * set_bit - Atomically set a bit in memory
29 * @nr: the bit to set
30 * @addr: the address to start counting from
31 *
32 * This function is atomic and may not be reordered.
33 * See __set_bit() if you do not require the atomic guarantees.
34 * Note that @nr may be almost arbitrarily large; this function is not
35 * restricted to acting on a single-word quantity.
36 */
37static inline void set_bit(unsigned nr, volatile unsigned long *addr)
38{
39 _atomic_or(addr + BIT_WORD(nr), BIT_MASK(nr));
40}
41
42/**
43 * clear_bit - Clears a bit in memory
44 * @nr: Bit to clear
45 * @addr: Address to start counting from
46 *
47 * clear_bit() is atomic and may not be reordered.
48 * See __clear_bit() if you do not require the atomic guarantees.
49 * Note that @nr may be almost arbitrarily large; this function is not
50 * restricted to acting on a single-word quantity.
51 *
52 * clear_bit() may not contain a memory barrier, so if it is used for
53 * locking purposes, you should call smp_mb__before_clear_bit() and/or
54 * smp_mb__after_clear_bit() to ensure changes are visible on other cpus.
55 */
56static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
57{
58 _atomic_andn(addr + BIT_WORD(nr), BIT_MASK(nr));
59}
60
61/**
62 * change_bit - Toggle a bit in memory
63 * @nr: Bit to change
64 * @addr: Address to start counting from
65 *
66 * change_bit() is atomic and may not be reordered.
67 * See __change_bit() if you do not require the atomic guarantees.
68 * Note that @nr may be almost arbitrarily large; this function is not
69 * restricted to acting on a single-word quantity.
70 */
71static inline void change_bit(unsigned nr, volatile unsigned long *addr)
72{
73 _atomic_xor(addr + BIT_WORD(nr), BIT_MASK(nr));
74}
75
76/**
77 * test_and_set_bit - Set a bit and return its old value
78 * @nr: Bit to set
79 * @addr: Address to count from
80 *
81 * This operation is atomic and cannot be reordered.
82 * It also implies a memory barrier.
83 */
84static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
85{
86 unsigned long mask = BIT_MASK(nr);
87 addr += BIT_WORD(nr);
88 smp_mb(); /* barrier for proper semantics */
89 return (_atomic_or(addr, mask) & mask) != 0;
90}
91
92/**
93 * test_and_clear_bit - Clear a bit and return its old value
94 * @nr: Bit to clear
95 * @addr: Address to count from
96 *
97 * This operation is atomic and cannot be reordered.
98 * It also implies a memory barrier.
99 */
100static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
101{
102 unsigned long mask = BIT_MASK(nr);
103 addr += BIT_WORD(nr);
104 smp_mb(); /* barrier for proper semantics */
105 return (_atomic_andn(addr, mask) & mask) != 0;
106}
107
108/**
109 * test_and_change_bit - Change a bit and return its old value
110 * @nr: Bit to change
111 * @addr: Address to count from
112 *
113 * This operation is atomic and cannot be reordered.
114 * It also implies a memory barrier.
115 */
116static inline int test_and_change_bit(unsigned nr,
117 volatile unsigned long *addr)
118{
119 unsigned long mask = BIT_MASK(nr);
120 addr += BIT_WORD(nr);
121 smp_mb(); /* barrier for proper semantics */
122 return (_atomic_xor(addr, mask) & mask) != 0;
123}
124
125/* See discussion at smp_mb__before_atomic_dec() in <asm/atomic_32.h>. */
126#define smp_mb__before_clear_bit() smp_mb()
127#define smp_mb__after_clear_bit() do {} while (0)
128
129#include <asm-generic/bitops/ext2-atomic.h>
130
131#endif /* _ASM_TILE_BITOPS_32_H */