projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * bitops.c: atomic operations which got too long to be inlined all over | |
| 3 | * the place. | |
| 4 | * | |
| 5 | * Copyright 1999 Philipp Rumpf (prumpf@tux.org) | |
| 6 | * Copyright 2000 Grant Grundler (grundler@cup.hp.com) | |
| 7 | */ | |
| 8 | ||
| 1da177e4 LT |
9 | #include <linux/kernel.h> |
| 10 | #include <linux/spinlock.h> | |
| 11 | #include <asm/system.h> | |
| 60063497 | 12 | #include <linux/atomic.h> |
| 1da177e4 LT |
13 | |
| 14 | #ifdef CONFIG_SMP | |
| 445c8951 | 15 | arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = { |
| edc35bd7 | 16 | [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED |
| 1da177e4 LT |
17 | }; |
| 18 | #endif | |
| 19 | ||
| a8f44e38 | 20 | #ifdef CONFIG_64BIT |
| 1da177e4 LT |
21 | unsigned long __xchg64(unsigned long x, unsigned long *ptr) |
| 22 | { | |
| 23 | unsigned long temp, flags; | |
| 24 | ||
| 25 | _atomic_spin_lock_irqsave(ptr, flags); | |
| 26 | temp = *ptr; | |
| 27 | *ptr = x; | |
| 28 | _atomic_spin_unlock_irqrestore(ptr, flags); | |
| 29 | return temp; | |
| 30 | } | |
| 31 | #endif | |
| 32 | ||
| 33 | unsigned long __xchg32(int x, int *ptr) | |
| 34 | { | |
| 35 | unsigned long flags; | |
| 36 | long temp; | |
| 37 | ||
| 38 | _atomic_spin_lock_irqsave(ptr, flags); | |
| 39 | temp = (long) *ptr; /* XXX - sign extension wanted? */ | |
| 40 | *ptr = x; | |
| 41 | _atomic_spin_unlock_irqrestore(ptr, flags); | |
| 42 | return (unsigned long)temp; | |
| 43 | } | |
| 44 | ||
| 45 | ||
| 46 | unsigned long __xchg8(char x, char *ptr) | |
| 47 | { | |
| 48 | unsigned long flags; | |
| 49 | long temp; | |
| 50 | ||
| 51 | _atomic_spin_lock_irqsave(ptr, flags); | |
| 52 | temp = (long) *ptr; /* XXX - sign extension wanted? */ | |
| 53 | *ptr = x; | |
| 54 | _atomic_spin_unlock_irqrestore(ptr, flags); | |
| 55 | return (unsigned long)temp; | |
| 56 | } | |
| 57 | ||
| 58 | ||
| a8f44e38 | 59 | #ifdef CONFIG_64BIT |
| 1da177e4 LT |
60 | unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new) |
| 61 | { | |
| 62 | unsigned long flags; | |
| 63 | unsigned long prev; | |
| 64 | ||
| 65 | _atomic_spin_lock_irqsave(ptr, flags); | |
| 66 | if ((prev = *ptr) == old) | |
| 67 | *ptr = new; | |
| 68 | _atomic_spin_unlock_irqrestore(ptr, flags); | |
| 69 | return prev; | |
| 70 | } | |
| 71 | #endif | |
| 72 | ||
| 73 | unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new) | |
| 74 | { | |
| 75 | unsigned long flags; | |
| 76 | unsigned int prev; | |
| 77 | ||
| 78 | _atomic_spin_lock_irqsave(ptr, flags); | |
| 79 | if ((prev = *ptr) == old) | |
| 80 | *ptr = new; | |
| 81 | _atomic_spin_unlock_irqrestore(ptr, flags); | |
| 82 | return (unsigned long)prev; | |
| 83 | } |