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