/* * bitops.c: atomic operations which got too long to be inlined all over * the place. * * Copyright 1999 Philipp Rumpf (prumpf@tux.org) * Copyright 2000 Grant Grundler (grundler@cup.hp.com) */ #include #include #include #ifdef CONFIG_SMP arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = { [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED }; #endif #ifdef CONFIG_64BIT unsigned long __xchg64(unsigned long x, unsigned long *ptr) { unsigned long temp, flags; _atomic_spin_lock_irqsave(ptr, flags); temp = *ptr; *ptr = x; _atomic_spin_unlock_irqrestore(ptr, flags); return temp; } #endif unsigned long __xchg32(int x, int *ptr) { unsigned long flags; long temp; _atomic_spin_lock_irqsave(ptr, flags); temp = (long) *ptr; /* XXX - sign extension wanted? */ *ptr = x; _atomic_spin_unlock_irqrestore(ptr, flags); return (unsigned long)temp; } unsigned long __xchg8(char x, char *ptr) { unsigned long flags; long temp; _atomic_spin_lock_irqsave(ptr, flags); temp = (long) *ptr; /* XXX - sign extension wanted? */ *ptr = x; _atomic_spin_unlock_irqrestore(ptr, flags); return (unsigned long)temp; } #ifdef CONFIG_64BIT unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new) { unsigned long flags; unsigned long prev; _atomic_spin_lock_irqsave(ptr, flags); if ((prev = *ptr) == old) *ptr = new; _atomic_spin_unlock_irqrestore(ptr, flags); return prev; } #endif unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new) { unsigned long flags; unsigned int prev; _atomic_spin_lock_irqsave(ptr, flags); if ((prev = *ptr) == old) *ptr = new; _atomic_spin_unlock_irqrestore(ptr, flags); return (unsigned long)prev; } n value='distro/collabora/co-22.05'>distro/collabora/co-22.05 Unnamed repository; edit this file to name it for gitweb.root

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