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
23int atomic_add_return(int, atomic_t *);
24int atomic_cmpxchg(atomic_t *, int, int);
25int atomic_xchg(atomic_t *, int);
26int __atomic_add_unless(atomic_t *, int, int);
27void 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