]>
git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/sparc/lib/atomic32.c
2 * atomic32.c: 32-bit atomic_t implementation
4 * Copyright (C) 2004 Keith M Wesolowski
5 * Copyright (C) 2007 Kyle McMartin
7 * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
10 #include <linux/atomic.h>
11 #include <linux/spinlock.h>
12 #include <linux/module.h>
15 #define ATOMIC_HASH_SIZE 4
16 #define ATOMIC_HASH(a) (&__atomic_hash[(((unsigned long)a)>>8) & (ATOMIC_HASH_SIZE-1)])
18 spinlock_t __atomic_hash
[ATOMIC_HASH_SIZE
] = {
19 [0 ... (ATOMIC_HASH_SIZE
-1)] = __SPIN_LOCK_UNLOCKED(__atomic_hash
)
24 static DEFINE_SPINLOCK(dummy
);
25 #define ATOMIC_HASH_SIZE 1
26 #define ATOMIC_HASH(a) (&dummy)
30 #define ATOMIC_FETCH_OP(op, c_op) \
31 int atomic_fetch_##op(int i, atomic_t *v) \
34 unsigned long flags; \
35 spin_lock_irqsave(ATOMIC_HASH(v), flags); \
40 spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
43 EXPORT_SYMBOL(atomic_fetch_##op);
45 #define ATOMIC_OP_RETURN(op, c_op) \
46 int atomic_##op##_return(int i, atomic_t *v) \
49 unsigned long flags; \
50 spin_lock_irqsave(ATOMIC_HASH(v), flags); \
52 ret = (v->counter c_op i); \
54 spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
57 EXPORT_SYMBOL(atomic_##op##_return);
59 ATOMIC_OP_RETURN(add
, +=)
61 ATOMIC_FETCH_OP(add
, +=)
62 ATOMIC_FETCH_OP(and, &=)
63 ATOMIC_FETCH_OP(or, |=)
64 ATOMIC_FETCH_OP(xor, ^=)
66 #undef ATOMIC_FETCH_OP
67 #undef ATOMIC_OP_RETURN
69 int atomic_xchg(atomic_t
*v
, int new)
74 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
77 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
80 EXPORT_SYMBOL(atomic_xchg
);
82 int atomic_cmpxchg(atomic_t
*v
, int old
, int new)
87 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
89 if (likely(ret
== old
))
92 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
95 EXPORT_SYMBOL(atomic_cmpxchg
);
97 int __atomic_add_unless(atomic_t
*v
, int a
, int u
)
102 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
106 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
109 EXPORT_SYMBOL(__atomic_add_unless
);
111 /* Atomic operations are already serializing */
112 void atomic_set(atomic_t
*v
, int i
)
116 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
118 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
120 EXPORT_SYMBOL(atomic_set
);
122 unsigned long ___set_bit(unsigned long *addr
, unsigned long mask
)
124 unsigned long old
, flags
;
126 spin_lock_irqsave(ATOMIC_HASH(addr
), flags
);
129 spin_unlock_irqrestore(ATOMIC_HASH(addr
), flags
);
133 EXPORT_SYMBOL(___set_bit
);
135 unsigned long ___clear_bit(unsigned long *addr
, unsigned long mask
)
137 unsigned long old
, flags
;
139 spin_lock_irqsave(ATOMIC_HASH(addr
), flags
);
142 spin_unlock_irqrestore(ATOMIC_HASH(addr
), flags
);
146 EXPORT_SYMBOL(___clear_bit
);
148 unsigned long ___change_bit(unsigned long *addr
, unsigned long mask
)
150 unsigned long old
, flags
;
152 spin_lock_irqsave(ATOMIC_HASH(addr
), flags
);
155 spin_unlock_irqrestore(ATOMIC_HASH(addr
), flags
);
159 EXPORT_SYMBOL(___change_bit
);
161 unsigned long __cmpxchg_u32(volatile u32
*ptr
, u32 old
, u32
new)
166 spin_lock_irqsave(ATOMIC_HASH(ptr
), flags
);
167 if ((prev
= *ptr
) == old
)
169 spin_unlock_irqrestore(ATOMIC_HASH(ptr
), flags
);
171 return (unsigned long)prev
;
173 EXPORT_SYMBOL(__cmpxchg_u32
);
175 unsigned long __xchg_u32(volatile u32
*ptr
, u32
new)
180 spin_lock_irqsave(ATOMIC_HASH(ptr
), flags
);
183 spin_unlock_irqrestore(ATOMIC_HASH(ptr
), flags
);
185 return (unsigned long)prev
;
187 EXPORT_SYMBOL(__xchg_u32
);