| #ifndef __ASM_SH_ATOMIC_H |
| #define __ASM_SH_ATOMIC_H |
| |
| /* |
| * Atomic operations that C can't guarantee us. Useful for |
| * resource counting etc.. |
| * |
| */ |
| |
| #include <linux/compiler.h> |
| #include <linux/types.h> |
| #include <asm/system.h> |
| |
| #define ATOMIC_INIT(i) ( (atomic_t) { (i) } ) |
| |
| #define atomic_read(v) ((v)->counter) |
| #define atomic_set(v,i) ((v)->counter = (i)) |
| |
| #if defined(CONFIG_GUSA_RB) |
| #include <asm/atomic-grb.h> |
| #elif defined(CONFIG_CPU_SH4A) |
| #include <asm/atomic-llsc.h> |
| #else |
| #include <asm/atomic-irq.h> |
| #endif |
| |
| #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
| |
| #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| #define atomic_inc_return(v) atomic_add_return(1,(v)) |
| |
| /* |
| * atomic_inc_and_test - increment and test |
| * @v: pointer of type atomic_t |
| * |
| * Atomically increments @v by 1 |
| * and returns true if the result is zero, or false for all |
| * other cases. |
| */ |
| #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| |
| #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
| |
| #define atomic_inc(v) atomic_add(1,(v)) |
| #define atomic_dec(v) atomic_sub(1,(v)) |
| |
| #if !defined(CONFIG_GUSA_RB) && !defined(CONFIG_CPU_SH4A) |
| static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
| { |
| int ret; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| ret = v->counter; |
| if (likely(ret == old)) |
| v->counter = new; |
| local_irq_restore(flags); |
| |
| return ret; |
| } |
| |
| static inline int atomic_add_unless(atomic_t *v, int a, int u) |
| { |
| int ret; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| ret = v->counter; |
| if (ret != u) |
| v->counter += a; |
| local_irq_restore(flags); |
| |
| return ret != u; |
| } |
| #endif /* !CONFIG_GUSA_RB && !CONFIG_CPU_SH4A */ |
| |
| #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| |
| /* Atomic operations are already serializing on SH */ |
| #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-long.h> |
| #endif /* __ASM_SH_ATOMIC_H */ |