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Diffstat (limited to 'arch/metag/include/asm/bitops.h')
-rw-r--r-- | arch/metag/include/asm/bitops.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/metag/include/asm/bitops.h b/arch/metag/include/asm/bitops.h new file mode 100644 index 000000000000..c0d0df0d1378 --- /dev/null +++ b/arch/metag/include/asm/bitops.h @@ -0,0 +1,132 @@ +#ifndef __ASM_METAG_BITOPS_H +#define __ASM_METAG_BITOPS_H + +#include <linux/compiler.h> +#include <asm/barrier.h> +#include <asm/global_lock.h> + +/* + * clear_bit() doesn't provide any barrier for the compiler. + */ +#define smp_mb__before_clear_bit() barrier() +#define smp_mb__after_clear_bit() barrier() + +#ifdef CONFIG_SMP +/* + * These functions are the basis of our bit ops. + */ +static inline void set_bit(unsigned int bit, volatile unsigned long *p) +{ + unsigned long flags; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + fence(); + *p |= mask; + __global_unlock1(flags); +} + +static inline void clear_bit(unsigned int bit, volatile unsigned long *p) +{ + unsigned long flags; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + fence(); + *p &= ~mask; + __global_unlock1(flags); +} + +static inline void change_bit(unsigned int bit, volatile unsigned long *p) +{ + unsigned long flags; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + fence(); + *p ^= mask; + __global_unlock1(flags); +} + +static inline int test_and_set_bit(unsigned int bit, volatile unsigned long *p) +{ + unsigned long flags; + unsigned long old; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + old = *p; + if (!(old & mask)) { + fence(); + *p = old | mask; + } + __global_unlock1(flags); + + return (old & mask) != 0; +} + +static inline int test_and_clear_bit(unsigned int bit, + volatile unsigned long *p) +{ + unsigned long flags; + unsigned long old; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + old = *p; + if (old & mask) { + fence(); + *p = old & ~mask; + } + __global_unlock1(flags); + + return (old & mask) != 0; +} + +static inline int test_and_change_bit(unsigned int bit, + volatile unsigned long *p) +{ + unsigned long flags; + unsigned long old; + unsigned long mask = 1UL << (bit & 31); + + p += bit >> 5; + + __global_lock1(flags); + fence(); + old = *p; + *p = old ^ mask; + __global_unlock1(flags); + + return (old & mask) != 0; +} + +#else +#include <asm-generic/bitops/atomic.h> +#endif /* CONFIG_SMP */ + +#include <asm-generic/bitops/non-atomic.h> +#include <asm-generic/bitops/find.h> +#include <asm-generic/bitops/ffs.h> +#include <asm-generic/bitops/__ffs.h> +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/hweight.h> +#include <asm-generic/bitops/lock.h> +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/le.h> +#include <asm-generic/bitops/ext2-atomic.h> + +#endif /* __ASM_METAG_BITOPS_H */ |