| /* $Id: atomic.h,v 1.22 2001/07/11 23:56:07 davem Exp $ |
| * atomic.h: Thankfully the V9 is at least reasonable for this |
| * stuff. |
| * |
| * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com) |
| */ |
| |
| #ifndef __ARCH_SPARC64_ATOMIC__ |
| #define __ARCH_SPARC64_ATOMIC__ |
| |
| #include <linux/types.h> |
| |
| typedef struct { volatile int counter; } atomic_t; |
| typedef struct { volatile __s64 counter; } atomic64_t; |
| |
| #define ATOMIC_INIT(i) { (i) } |
| #define ATOMIC64_INIT(i) { (i) } |
| |
| #define atomic_read(v) ((v)->counter) |
| #define atomic64_read(v) ((v)->counter) |
| |
| #define atomic_set(v, i) (((v)->counter) = i) |
| #define atomic64_set(v, i) (((v)->counter) = i) |
| |
| extern void atomic_add(int, atomic_t *); |
| extern void atomic64_add(int, atomic64_t *); |
| extern void atomic_sub(int, atomic_t *); |
| extern void atomic64_sub(int, atomic64_t *); |
| |
| extern int atomic_add_ret(int, atomic_t *); |
| extern int atomic64_add_ret(int, atomic64_t *); |
| extern int atomic_sub_ret(int, atomic_t *); |
| extern int atomic64_sub_ret(int, atomic64_t *); |
| |
| #define atomic_dec_return(v) atomic_sub_ret(1, v) |
| #define atomic64_dec_return(v) atomic64_sub_ret(1, v) |
| |
| #define atomic_inc_return(v) atomic_add_ret(1, v) |
| #define atomic64_inc_return(v) atomic64_add_ret(1, v) |
| |
| #define atomic_sub_return(i, v) atomic_sub_ret(i, v) |
| #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v) |
| |
| #define atomic_add_return(i, v) atomic_add_ret(i, v) |
| #define atomic64_add_return(i, v) atomic64_add_ret(i, 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 atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| |
| #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0) |
| #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0) |
| |
| #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0) |
| #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0) |
| |
| #define atomic_inc(v) atomic_add(1, v) |
| #define atomic64_inc(v) atomic64_add(1, v) |
| |
| #define atomic_dec(v) atomic_sub(1, v) |
| #define atomic64_dec(v) atomic64_sub(1, v) |
| |
| #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0) |
| #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0) |
| |
| #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
| #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| |
| #define atomic_add_unless(v, a, u) \ |
| ({ \ |
| __typeof__((v)->counter) c, old; \ |
| c = atomic_read(v); \ |
| for (;;) { \ |
| if (unlikely(c == (u))) \ |
| break; \ |
| old = atomic_cmpxchg((v), c, c + (a)); \ |
| if (likely(old == c)) \ |
| break; \ |
| c = old; \ |
| } \ |
| likely(c != (u)); \ |
| }) |
| #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| |
| #define atomic64_cmpxchg(v, o, n) \ |
| ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) |
| #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
| |
| #define atomic64_add_unless(v, a, u) \ |
| ({ \ |
| __typeof__((v)->counter) c, old; \ |
| c = atomic64_read(v); \ |
| for (;;) { \ |
| if (unlikely(c == (u))) \ |
| break; \ |
| old = atomic64_cmpxchg((v), c, c + (a)); \ |
| if (likely(old == c)) \ |
| break; \ |
| c = old; \ |
| } \ |
| likely(c != (u)); \ |
| }) |
| #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
| |
| /* Atomic operations are already serializing */ |
| #ifdef CONFIG_SMP |
| #define smp_mb__before_atomic_dec() membar_storeload_loadload(); |
| #define smp_mb__after_atomic_dec() membar_storeload_storestore(); |
| #define smp_mb__before_atomic_inc() membar_storeload_loadload(); |
| #define smp_mb__after_atomic_inc() membar_storeload_storestore(); |
| #else |
| #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() |
| #endif |
| |
| #include <asm-generic/atomic.h> |
| #endif /* !(__ARCH_SPARC64_ATOMIC__) */ |