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Diffstat (limited to '')
| -rw-r--r-- | include/asm-generic/bitops/atomic.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/atomic.h b/include/asm-generic/bitops/atomic.h new file mode 100644 index 000000000..21aa26e7c --- /dev/null +++ b/include/asm-generic/bitops/atomic.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_ +#define _ASM_GENERIC_BITOPS_ATOMIC_H_ + +#include <linux/atomic.h> +#include <linux/compiler.h> +#include <asm/barrier.h> + +/* + * Implementation of atomic bitops using atomic-fetch ops. + * See Documentation/atomic_bitops.txt for details. + */ + +static __always_inline void set_bit(unsigned int nr, volatile unsigned long *p) +{ + p += BIT_WORD(nr); + atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p); +} + +static __always_inline void clear_bit(unsigned int nr, volatile unsigned long *p) +{ + p += BIT_WORD(nr); + atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p); +} + +static __always_inline void change_bit(unsigned int nr, volatile unsigned long *p) +{ + p += BIT_WORD(nr); + atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p); +} + +static inline int test_and_set_bit(unsigned int nr, volatile unsigned long *p) +{ + long old; + unsigned long mask = BIT_MASK(nr); + + p += BIT_WORD(nr); + old = atomic_long_fetch_or(mask, (atomic_long_t *)p); + return !!(old & mask); +} + +static inline int test_and_clear_bit(unsigned int nr, volatile unsigned long *p) +{ + long old; + unsigned long mask = BIT_MASK(nr); + + p += BIT_WORD(nr); + old = atomic_long_fetch_andnot(mask, (atomic_long_t *)p); + return !!(old & mask); +} + +static inline int test_and_change_bit(unsigned int nr, volatile unsigned long *p) +{ + long old; + unsigned long mask = BIT_MASK(nr); + + p += BIT_WORD(nr); + old = atomic_long_fetch_xor(mask, (atomic_long_t *)p); + return !!(old & mask); +} + +#endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */ |