2 * bitops.c: atomic operations which got too long to be inlined all over
5 * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
6 * Copyright 2000 Grant Grundler (grundler@cup.hp.com)
9 #include <linux/config.h>
10 #include <linux/kernel.h>
11 #include <linux/spinlock.h>
12 #include <asm/system.h>
13 #include <asm/atomic.h>
16 spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
17 [0 ... (ATOMIC_HASH_SIZE-1)] = SPIN_LOCK_UNLOCKED
21 spinlock_t __atomic_lock = SPIN_LOCK_UNLOCKED;
24 unsigned long __xchg64(unsigned long x, unsigned long *ptr)
26 unsigned long temp, flags;
28 SPIN_LOCK_IRQSAVE(ATOMIC_HASH(ptr), flags);
31 SPIN_UNLOCK_IRQRESTORE(ATOMIC_HASH(ptr), flags);
36 unsigned long __xchg32(int x, int *ptr)
41 SPIN_LOCK_IRQSAVE(ATOMIC_HASH(ptr), flags);
42 (long) temp = (long) *ptr; /* XXX - sign extension wanted? */
44 SPIN_UNLOCK_IRQRESTORE(ATOMIC_HASH(ptr), flags);
49 unsigned long __xchg8(char x, char *ptr)
54 SPIN_LOCK_IRQSAVE(ATOMIC_HASH(ptr), flags);
55 (long) temp = (long) *ptr; /* XXX - sign extension wanted? */
57 SPIN_UNLOCK_IRQRESTORE(ATOMIC_HASH(ptr), flags);
63 unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new)
68 SPIN_LOCK_IRQSAVE(ATOMIC_HASH(ptr), flags);
69 if ((prev = *ptr) == old)
71 SPIN_UNLOCK_IRQRESTORE(ATOMIC_HASH(ptr), flags);
76 unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
81 SPIN_LOCK_IRQSAVE(ATOMIC_HASH(ptr), flags);
82 if ((prev = *ptr) == old)
84 SPIN_UNLOCK_IRQRESTORE(ATOMIC_HASH(ptr), flags);
85 return (unsigned long)prev;