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93 lines
2.0 KiB
93 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* bitops.c: atomic operations which got too long to be inlined all over |
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* the place. |
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* |
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* Copyright 1999 Philipp Rumpf ([email protected]) |
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* Copyright 2000 Grant Grundler ([email protected]) |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/spinlock.h> |
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#include <linux/atomic.h> |
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#ifdef CONFIG_SMP |
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arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = { |
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[0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED |
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}; |
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#endif |
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#ifdef CONFIG_64BIT |
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unsigned long __xchg64(unsigned long x, volatile unsigned long *ptr) |
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{ |
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unsigned long temp, flags; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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temp = *ptr; |
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*ptr = x; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return temp; |
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} |
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#endif |
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unsigned long __xchg32(int x, volatile int *ptr) |
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{ |
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unsigned long flags; |
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long temp; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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temp = (long) *ptr; /* XXX - sign extension wanted? */ |
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*ptr = x; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return (unsigned long)temp; |
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} |
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unsigned long __xchg8(char x, volatile char *ptr) |
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{ |
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unsigned long flags; |
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long temp; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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temp = (long) *ptr; /* XXX - sign extension wanted? */ |
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*ptr = x; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return (unsigned long)temp; |
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} |
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u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new) |
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{ |
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unsigned long flags; |
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u64 prev; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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if ((prev = *ptr) == old) |
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*ptr = new; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return prev; |
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} |
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unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new) |
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{ |
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unsigned long flags; |
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unsigned int prev; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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if ((prev = *ptr) == old) |
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*ptr = new; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return (unsigned long)prev; |
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} |
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u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new) |
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{ |
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unsigned long flags; |
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u8 prev; |
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_atomic_spin_lock_irqsave(ptr, flags); |
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if ((prev = *ptr) == old) |
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*ptr = new; |
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_atomic_spin_unlock_irqrestore(ptr, flags); |
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return prev; |
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}
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