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/barrier.h> 18 #include <asm-generic/atomic64.h> 19 20 21 #define ATOMIC_INIT(i) { (i) } 22 23 int atomic_add_return(int, atomic_t *); 24 int atomic_cmpxchg(atomic_t *, int, int); 25 int atomic_xchg(atomic_t *, int); 26 int __atomic_add_unless(atomic_t *, int, int); 27 void atomic_set(atomic_t *, int); 28 29 #define atomic_read(v) ACCESS_ONCE((v)->counter) 30 31 #define atomic_add(i, v) ((void)atomic_add_return( (int)(i), (v))) 32 #define atomic_sub(i, v) ((void)atomic_add_return(-(int)(i), (v))) 33 #define atomic_inc(v) ((void)atomic_add_return( 1, (v))) 34 #define atomic_dec(v) ((void)atomic_add_return( -1, (v))) 35 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 #endif /* !(__ARCH_SPARC_ATOMIC__) */ 56