| /* $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__ |
| |
| 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) |
| |
| extern int __atomic_add(int, atomic_t *); |
| extern int __atomic_sub(int, atomic_t *); |
| |
| #define atomic_add(i, v) ((void)__atomic_add(i, v)) |
| #define atomic_sub(i, v) ((void)__atomic_sub(i, v)) |
| |
| #define atomic_dec_return(v) __atomic_sub(1, v) |
| #define atomic_inc_return(v) __atomic_add(1, v) |
| |
| #define atomic_sub_and_test(i, v) (__atomic_sub(i, v) == 0) |
| #define atomic_dec_and_test(v) (__atomic_sub(1, v) == 0) |
| |
| #define atomic_inc(v) ((void)__atomic_add(1, v)) |
| #define atomic_dec(v) ((void)__atomic_sub(1, v)) |
| |
| /* 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() |
| |
| #endif /* !(__ARCH_SPARC64_ATOMIC__) */ |
