1 /* atomic.h: These still suck, but the I-cache hit rate is higher. 2 * 3 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 4 * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com.au) 5 * Copyright (C) 2007 Kyle McMartin (kyle@parisc-linux.org) 6 * 7 * Additions by Keith M Wesolowski (wesolows@foobazco.org) based 8 * on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>. 9 */ 10 11 #ifndef __ARCH_SPARC_ATOMIC__ 12 #define __ARCH_SPARC_ATOMIC__ 13 14 #include <linux/types.h> 15 16 #include <asm/cmpxchg.h> 17 #include <asm-generic/atomic64.h> 18 19 20 #define ATOMIC_INIT(i) { (i) } 21 22 extern int __atomic_add_return(int, atomic_t *); 23 extern int atomic_cmpxchg(atomic_t *, int, int); 24 #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 25 extern int __atomic_add_unless(atomic_t *, int, int); 26 extern void atomic_set(atomic_t *, int); 27 28 #define atomic_read(v) (*(volatile int *)&(v)->counter) 29 30 #define atomic_add(i, v) ((void)__atomic_add_return( (int)(i), (v))) 31 #define atomic_sub(i, v) ((void)__atomic_add_return(-(int)(i), (v))) 32 #define atomic_inc(v) ((void)__atomic_add_return( 1, (v))) 33 #define atomic_dec(v) ((void)__atomic_add_return( -1, (v))) 34 35 #define atomic_add_return(i, v) (__atomic_add_return( (int)(i), (v))) 36 #define atomic_sub_return(i, v) (__atomic_add_return(-(int)(i), (v))) 37 #define atomic_inc_return(v) (__atomic_add_return( 1, (v))) 38 #define atomic_dec_return(v) (__atomic_add_return( -1, (v))) 39 40 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) 41 42 /* 43 * atomic_inc_and_test - increment and test 44 * @v: pointer of type atomic_t 45 * 46 * Atomically increments @v by 1 47 * and returns true if the result is zero, or false for all 48 * other cases. 49 */ 50 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 51 52 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) 53 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) 54 55 /* Atomic operations are already serializing */ 56 #define smp_mb__before_atomic_dec() barrier() 57 #define smp_mb__after_atomic_dec() barrier() 58 #define smp_mb__before_atomic_inc() barrier() 59 #define smp_mb__after_atomic_inc() barrier() 60 61 #endif /* !(__ARCH_SPARC_ATOMIC__) */ 62