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 raw_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
17 [0 ... (ATOMIC_HASH_SIZE-1)] = __RAW_SPIN_LOCK_UNLOCKED
22 unsigned long __xchg64(unsigned long x, unsigned long *ptr)
24 unsigned long temp, flags;
26 _atomic_spin_lock_irqsave(ptr, flags);
29 _atomic_spin_unlock_irqrestore(ptr, flags);
34 unsigned long __xchg32(int x, int *ptr)
39 _atomic_spin_lock_irqsave(ptr, flags);
40 temp = (long) *ptr; /* XXX - sign extension wanted? */
42 _atomic_spin_unlock_irqrestore(ptr, flags);
43 return (unsigned long)temp;
47 unsigned long __xchg8(char x, char *ptr)
52 _atomic_spin_lock_irqsave(ptr, flags);
53 temp = (long) *ptr; /* XXX - sign extension wanted? */
55 _atomic_spin_unlock_irqrestore(ptr, flags);
56 return (unsigned long)temp;
61 unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new)
66 _atomic_spin_lock_irqsave(ptr, flags);
67 if ((prev = *ptr) == old)
69 _atomic_spin_unlock_irqrestore(ptr, flags);
74 unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
79 _atomic_spin_lock_irqsave(ptr, flags);
80 if ((prev = *ptr) == old)
82 _atomic_spin_unlock_irqrestore(ptr, flags);
83 return (unsigned long)prev;