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 #define ATOMIC_INIT(i) { (i) } 21 22 int atomic_add_return(int, atomic_t *); 23 int atomic_fetch_add(int, atomic_t *); 24 int atomic_fetch_and(int, atomic_t *); 25 int atomic_fetch_or(int, atomic_t *); 26 int atomic_fetch_xor(int, atomic_t *); 27 int atomic_cmpxchg(atomic_t *, int, int); 28 int atomic_xchg(atomic_t *, int); 29 int __atomic_add_unless(atomic_t *, int, int); 30 void atomic_set(atomic_t *, int); 31 32 #define atomic_read(v) ACCESS_ONCE((v)->counter) 33 34 #define atomic_add(i, v) ((void)atomic_add_return( (int)(i), (v))) 35 #define atomic_sub(i, v) ((void)atomic_add_return(-(int)(i), (v))) 36 #define atomic_inc(v) ((void)atomic_add_return( 1, (v))) 37 #define atomic_dec(v) ((void)atomic_add_return( -1, (v))) 38 39 #define atomic_and(i, v) ((void)atomic_fetch_and((i), (v))) 40 #define atomic_or(i, v) ((void)atomic_fetch_or((i), (v))) 41 #define atomic_xor(i, v) ((void)atomic_fetch_xor((i), (v))) 42 43 #define atomic_sub_return(i, v) (atomic_add_return(-(int)(i), (v))) 44 #define atomic_fetch_sub(i, v) (atomic_fetch_add (-(int)(i), (v))) 45 46 #define atomic_inc_return(v) (atomic_add_return( 1, (v))) 47 #define atomic_dec_return(v) (atomic_add_return( -1, (v))) 48 49 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) 50 51 /* 52 * atomic_inc_and_test - increment and test 53 * @v: pointer of type atomic_t 54 * 55 * Atomically increments @v by 1 56 * and returns true if the result is zero, or false for all 57 * other cases. 58 */ 59 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 60 61 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) 62 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) 63 64 #endif /* !(__ARCH_SPARC_ATOMIC__) */ 65