diff options
Diffstat (limited to 'arch/cris/include/asm/atomic.h')
| -rw-r--r-- | arch/cris/include/asm/atomic.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/cris/include/asm/atomic.h b/arch/cris/include/asm/atomic.h new file mode 100644 index 00000000000..f71ea686a2e --- /dev/null +++ b/arch/cris/include/asm/atomic.h @@ -0,0 +1,164 @@ +/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */ + +#ifndef __ASM_CRIS_ATOMIC__ +#define __ASM_CRIS_ATOMIC__ + +#include <linux/compiler.h> + +#include <asm/system.h> +#include <arch/atomic.h> + +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + */ + +typedef struct { volatile int counter; } atomic_t; + +#define ATOMIC_INIT(i) { (i) } + +#define atomic_read(v) ((v)->counter) +#define atomic_set(v,i) (((v)->counter) = (i)) + +/* These should be written in asm but we do it in C for now. */ + +static inline void atomic_add(int i, volatile atomic_t *v) +{ + unsigned long flags; + cris_atomic_save(v, flags); + v->counter += i; + cris_atomic_restore(v, flags); +} + +static inline void atomic_sub(int i, volatile atomic_t *v) +{ + unsigned long flags; + cris_atomic_save(v, flags); + v->counter -= i; + cris_atomic_restore(v, flags); +} + +static inline int atomic_add_return(int i, volatile atomic_t *v) +{ + unsigned long flags; + int retval; + cris_atomic_save(v, flags); + retval = (v->counter += i); + cris_atomic_restore(v, flags); + return retval; +} + +#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) + +static inline int atomic_sub_return(int i, volatile atomic_t *v) +{ + unsigned long flags; + int retval; + cris_atomic_save(v, flags); + retval = (v->counter -= i); + cris_atomic_restore(v, flags); + return retval; +} + +static inline int atomic_sub_and_test(int i, volatile atomic_t *v) +{ + int retval; + unsigned long flags; + cris_atomic_save(v, flags); + retval = (v->counter -= i) == 0; + cris_atomic_restore(v, flags); + return retval; +} + +static inline void atomic_inc(volatile atomic_t *v) +{ + unsigned long flags; + cris_atomic_save(v, flags); + (v->counter)++; + cris_atomic_restore(v, flags); +} + +static inline void atomic_dec(volatile atomic_t *v) +{ + unsigned long flags; + cris_atomic_save(v, flags); + (v->counter)--; + cris_atomic_restore(v, flags); +} + +static inline int atomic_inc_return(volatile atomic_t *v) +{ + unsigned long flags; + int retval; + cris_atomic_save(v, flags); + retval = ++(v->counter); + cris_atomic_restore(v, flags); + return retval; +} + +static inline int atomic_dec_return(volatile atomic_t *v) +{ + unsigned long flags; + int retval; + cris_atomic_save(v, flags); + retval = --(v->counter); + cris_atomic_restore(v, flags); + return retval; +} +static inline int atomic_dec_and_test(volatile atomic_t *v) +{ + int retval; + unsigned long flags; + cris_atomic_save(v, flags); + retval = --(v->counter) == 0; + cris_atomic_restore(v, flags); + return retval; +} + +static inline int atomic_inc_and_test(volatile atomic_t *v) +{ + int retval; + unsigned long flags; + cris_atomic_save(v, flags); + retval = ++(v->counter) == 0; + cris_atomic_restore(v, flags); + return retval; +} + +static inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + int ret; + unsigned long flags; + + cris_atomic_save(v, flags); + ret = v->counter; + if (likely(ret == old)) + v->counter = new; + cris_atomic_restore(v, flags); + return ret; +} + +#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline int atomic_add_unless(atomic_t *v, int a, int u) +{ + int ret; + unsigned long flags; + + cris_atomic_save(v, flags); + ret = v->counter; + if (ret != u) + v->counter += a; + cris_atomic_restore(v, flags); + return ret != u; +} +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + +/* Atomic operations are already serializing */ +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() + +#include <asm-generic/atomic.h> +#endif |