1 /*
2 * Copyright 2011 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_64_H
16 #define _ASM_TILE_BITOPS_64_H
17
18 #include <linux/compiler.h>
19 #include <asm/cmpxchg.h>
20
21 /* See <asm/bitops.h> for API comments. */
22
set_bit(unsigned nr,volatile unsigned long * addr)23 static inline void set_bit(unsigned nr, volatile unsigned long *addr)
24 {
25 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
26 __insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
27 }
28
clear_bit(unsigned nr,volatile unsigned long * addr)29 static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
30 {
31 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
32 __insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
33 }
34
change_bit(unsigned nr,volatile unsigned long * addr)35 static inline void change_bit(unsigned nr, volatile unsigned long *addr)
36 {
37 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
38 unsigned long guess, oldval;
39 addr += nr / BITS_PER_LONG;
40 oldval = *addr;
41 do {
42 guess = oldval;
43 oldval = cmpxchg(addr, guess, guess ^ mask);
44 } while (guess != oldval);
45 }
46
47
48 /*
49 * The test_and_xxx_bit() routines require a memory fence before we
50 * start the operation, and after the operation completes. We use
51 * smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
52 * barrier(), to block until the atomic op is complete.
53 */
54
test_and_set_bit(unsigned nr,volatile unsigned long * addr)55 static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
56 {
57 int val;
58 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
59 smp_mb(); /* barrier for proper semantics */
60 val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
61 & mask) != 0;
62 barrier();
63 return val;
64 }
65
66
test_and_clear_bit(unsigned nr,volatile unsigned long * addr)67 static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
68 {
69 int val;
70 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
71 smp_mb(); /* barrier for proper semantics */
72 val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
73 & mask) != 0;
74 barrier();
75 return val;
76 }
77
78
test_and_change_bit(unsigned nr,volatile unsigned long * addr)79 static inline int test_and_change_bit(unsigned nr,
80 volatile unsigned long *addr)
81 {
82 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
83 unsigned long guess, oldval;
84 addr += nr / BITS_PER_LONG;
85 oldval = *addr;
86 do {
87 guess = oldval;
88 oldval = cmpxchg(addr, guess, guess ^ mask);
89 } while (guess != oldval);
90 return (oldval & mask) != 0;
91 }
92
93 #include <asm-generic/bitops/ext2-atomic-setbit.h>
94
95 #endif /* _ASM_TILE_BITOPS_64_H */
96