1 /* atomic.h: These still suck, but the I-cache hit rate is higher.
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)
7 * Additions by Keith M Wesolowski (wesolows@foobazco.org) based
8 * on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>.
11 #ifndef __ARCH_SPARC_ATOMIC__
12 #define __ARCH_SPARC_ATOMIC__
14 #include <linux/types.h>
16 #include <asm/cmpxchg.h>
17 #include <asm-generic/atomic64.h>
20 #define ATOMIC_INIT(i) { (i) }
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);
28 #define atomic_read(v) (*(volatile int *)&(v)->counter)
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)))
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)))
40 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
43 * atomic_inc_and_test - increment and test
44 * @v: pointer of type atomic_t
46 * Atomically increments @v by 1
47 * and returns true if the result is zero, or false for all
50 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
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)
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()
61 #endif /* !(__ARCH_SPARC_ATOMIC__) */