2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
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.
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
15 #ifndef _ASM_TILE_BITOPS_64_H
16 #define _ASM_TILE_BITOPS_64_H
18 #include <linux/compiler.h>
19 #include <asm/cmpxchg.h>
21 /* See <asm/bitops.h> for API comments. */
23 static inline void set_bit(unsigned nr, volatile unsigned long *addr)
25 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
26 __insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
29 static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
31 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
32 __insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
35 #define smp_mb__before_clear_bit() smp_mb()
36 #define smp_mb__after_clear_bit() smp_mb()
39 static inline void change_bit(unsigned nr, volatile unsigned long *addr)
41 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
42 unsigned long guess, oldval;
43 addr += nr / BITS_PER_LONG;
47 oldval = cmpxchg(addr, guess, guess ^ mask);
48 } while (guess != oldval);
53 * The test_and_xxx_bit() routines require a memory fence before we
54 * start the operation, and after the operation completes. We use
55 * smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
56 * barrier(), to block until the atomic op is complete.
59 static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
62 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
63 smp_mb(); /* barrier for proper semantics */
64 val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
71 static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
74 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
75 smp_mb(); /* barrier for proper semantics */
76 val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
83 static inline int test_and_change_bit(unsigned nr,
84 volatile unsigned long *addr)
86 unsigned long mask = (1UL << (nr % BITS_PER_LONG));
87 unsigned long guess, oldval;
88 addr += nr / BITS_PER_LONG;
92 oldval = cmpxchg(addr, guess, guess ^ mask);
93 } while (guess != oldval);
94 return (oldval & mask) != 0;
97 #include <asm-generic/bitops/ext2-atomic-setbit.h>
99 #endif /* _ASM_TILE_BITOPS_64_H */