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95 lines
2.7 KiB
95 lines
2.7 KiB
/* |
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* Copyright 2011 Tilera Corporation. All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation, version 2. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
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* NON INFRINGEMENT. See the GNU General Public License for |
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* more details. |
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*/ |
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#ifndef _ASM_TILE_BITOPS_64_H |
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#define _ASM_TILE_BITOPS_64_H |
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#include <linux/compiler.h> |
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#include <asm/cmpxchg.h> |
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/* See <asm/bitops.h> for API comments. */ |
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static inline void set_bit(unsigned nr, volatile unsigned long *addr) |
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{ |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask); |
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} |
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static inline void clear_bit(unsigned nr, volatile unsigned long *addr) |
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{ |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask); |
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} |
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static inline void change_bit(unsigned nr, volatile unsigned long *addr) |
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{ |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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unsigned long guess, oldval; |
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addr += nr / BITS_PER_LONG; |
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oldval = *addr; |
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do { |
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guess = oldval; |
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oldval = cmpxchg(addr, guess, guess ^ mask); |
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} while (guess != oldval); |
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} |
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/* |
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* The test_and_xxx_bit() routines require a memory fence before we |
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* start the operation, and after the operation completes. We use |
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* smp_mb() before, and rely on the "!= 0" comparison, plus a compiler |
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* barrier(), to block until the atomic op is complete. |
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*/ |
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static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr) |
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{ |
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int val; |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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smp_mb(); /* barrier for proper semantics */ |
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val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask) |
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& mask) != 0; |
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barrier(); |
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return val; |
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} |
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static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr) |
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{ |
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int val; |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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smp_mb(); /* barrier for proper semantics */ |
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val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask) |
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& mask) != 0; |
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barrier(); |
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return val; |
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} |
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static inline int test_and_change_bit(unsigned nr, |
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volatile unsigned long *addr) |
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{ |
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unsigned long mask = (1UL << (nr % BITS_PER_LONG)); |
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unsigned long guess, oldval; |
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addr += nr / BITS_PER_LONG; |
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oldval = *addr; |
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do { |
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guess = oldval; |
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oldval = cmpxchg(addr, guess, guess ^ mask); |
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} while (guess != oldval); |
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return (oldval & mask) != 0; |
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} |
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#include <asm-generic/bitops/ext2-atomic-setbit.h> |
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#endif /* _ASM_TILE_BITOPS_64_H */
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