2005-04-16 16:20:36 -06:00
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/*
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2008-08-02 03:55:55 -06:00
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* arch/arm/include/asm/atomic.h
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2005-04-16 16:20:36 -06:00
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*
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* Copyright (C) 1996 Russell King.
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* Copyright (C) 2002 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_ATOMIC_H
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#define __ASM_ARM_ATOMIC_H
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2005-11-16 10:23:57 -07:00
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#include <linux/compiler.h>
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2009-01-06 15:40:39 -07:00
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#include <linux/types.h>
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2007-05-08 01:34:38 -06:00
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#include <asm/system.h>
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2005-04-16 16:20:36 -06:00
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#define ATOMIC_INIT(i) { (i) }
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#ifdef __KERNEL__
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2009-09-18 16:27:05 -06:00
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/*
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* On ARM, ordinary assignment (str instruction) doesn't clear the local
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* strex/ldrex monitor on some implementations. The reason we can use it for
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* atomic_set() is the clrex or dummy strex done on every exception return.
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*/
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2010-05-16 22:33:53 -06:00
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#define atomic_read(v) (*(volatile int *)&(v)->counter)
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2009-09-18 16:27:05 -06:00
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#define atomic_set(v,i) (((v)->counter) = (i))
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2005-04-16 16:20:36 -06:00
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#if __LINUX_ARM_ARCH__ >= 6
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/*
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* ARMv6 UP and SMP safe atomic ops. We use load exclusive and
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* store exclusive to ensure that these are atomic. We may loop
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2009-09-18 16:27:05 -06:00
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* to ensure that the update happens.
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2005-04-16 16:20:36 -06:00
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*/
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2009-05-25 13:58:00 -06:00
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static inline void atomic_add(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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__asm__ __volatile__("@ atomic_add\n"
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"1: ldrex %0, [%2]\n"
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" add %0, %0, %3\n"
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" strex %1, %0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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}
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2005-04-16 16:20:36 -06:00
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-04-16 16:20:36 -06:00
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__asm__ __volatile__("@ atomic_add_return\n"
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"1: ldrex %0, [%2]\n"
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" add %0, %0, %3\n"
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" strex %1, %0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-04-16 16:20:36 -06:00
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return result;
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}
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2009-05-25 13:58:00 -06:00
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static inline void atomic_sub(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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__asm__ __volatile__("@ atomic_sub\n"
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"1: ldrex %0, [%2]\n"
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" sub %0, %0, %3\n"
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" strex %1, %0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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}
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2005-04-16 16:20:36 -06:00
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-04-16 16:20:36 -06:00
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__asm__ __volatile__("@ atomic_sub_return\n"
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"1: ldrex %0, [%2]\n"
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" sub %0, %0, %3\n"
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" strex %1, %0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-04-16 16:20:36 -06:00
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return result;
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}
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2005-11-13 17:07:24 -07:00
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static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
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{
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2005-11-16 11:03:10 -07:00
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unsigned long oldval, res;
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2005-11-13 17:07:24 -07:00
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-11-13 17:07:24 -07:00
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do {
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__asm__ __volatile__("@ atomic_cmpxchg\n"
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"ldrex %1, [%2]\n"
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2005-11-16 08:05:11 -07:00
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"mov %0, #0\n"
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2005-11-13 17:07:24 -07:00
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"teq %1, %3\n"
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"strexeq %0, %4, [%2]\n"
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: "=&r" (res), "=&r" (oldval)
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: "r" (&ptr->counter), "Ir" (old), "r" (new)
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: "cc");
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} while (res);
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2009-05-25 13:58:00 -06:00
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smp_mb();
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2005-11-13 17:07:24 -07:00
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return oldval;
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}
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2005-04-16 16:20:36 -06:00
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static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
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{
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unsigned long tmp, tmp2;
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__asm__ __volatile__("@ atomic_clear_mask\n"
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2007-03-15 09:54:27 -06:00
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"1: ldrex %0, [%2]\n"
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2005-04-16 16:20:36 -06:00
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" bic %0, %0, %3\n"
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2007-03-15 09:54:27 -06:00
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" strex %1, %0, [%2]\n"
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2005-04-16 16:20:36 -06:00
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (tmp), "=&r" (tmp2)
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: "r" (addr), "Ir" (mask)
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: "cc");
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}
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#else /* ARM_ARCH_6 */
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#ifdef CONFIG_SMP
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#error SMP not supported on pre-ARMv6 CPUs
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#endif
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long flags;
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int val;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_save(flags);
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2005-04-16 16:20:36 -06:00
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val = v->counter;
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v->counter = val += i;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_restore(flags);
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2005-04-16 16:20:36 -06:00
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return val;
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}
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2009-05-25 13:58:00 -06:00
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#define atomic_add(i, v) (void) atomic_add_return(i, v)
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2005-04-16 16:20:36 -06:00
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long flags;
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int val;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_save(flags);
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2005-04-16 16:20:36 -06:00
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val = v->counter;
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v->counter = val -= i;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_restore(flags);
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2005-04-16 16:20:36 -06:00
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return val;
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}
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2009-05-25 13:58:00 -06:00
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#define atomic_sub(i, v) (void) atomic_sub_return(i, v)
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2005-04-16 16:20:36 -06:00
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2005-11-13 17:07:24 -07:00
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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unsigned long flags;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_save(flags);
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2005-11-13 17:07:24 -07:00
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ret = v->counter;
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if (likely(ret == old))
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v->counter = new;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_restore(flags);
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2005-11-13 17:07:24 -07:00
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return ret;
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}
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2005-04-16 16:20:36 -06:00
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static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
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{
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unsigned long flags;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_save(flags);
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2005-04-16 16:20:36 -06:00
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*addr &= ~mask;
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2006-09-16 03:47:18 -06:00
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raw_local_irq_restore(flags);
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2005-04-16 16:20:36 -06:00
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}
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#endif /* __LINUX_ARM_ARCH__ */
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2006-01-09 16:59:17 -07:00
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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2005-11-13 17:07:25 -07:00
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static inline int atomic_add_unless(atomic_t *v, int a, int u)
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{
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int c, old;
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c = atomic_read(v);
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while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
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c = old;
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return c != u;
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}
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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2009-05-25 13:58:00 -06:00
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#define atomic_inc(v) atomic_add(1, v)
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#define atomic_dec(v) atomic_sub(1, v)
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2005-04-16 16:20:36 -06:00
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#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
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#define atomic_inc_return(v) (atomic_add_return(1, v))
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#define atomic_dec_return(v) (atomic_sub_return(1, v))
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#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
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#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
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2009-05-25 13:58:00 -06:00
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#define smp_mb__before_atomic_dec() smp_mb()
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#define smp_mb__after_atomic_dec() smp_mb()
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#define smp_mb__before_atomic_inc() smp_mb()
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#define smp_mb__after_atomic_inc() smp_mb()
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2005-04-16 16:20:36 -06:00
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2010-01-20 11:05:07 -07:00
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#ifndef CONFIG_GENERIC_ATOMIC64
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typedef struct {
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u64 __aligned(8) counter;
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} atomic64_t;
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#define ATOMIC64_INIT(i) { (i) }
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static inline u64 atomic64_read(atomic64_t *v)
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{
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u64 result;
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__asm__ __volatile__("@ atomic64_read\n"
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" ldrexd %0, %H0, [%1]"
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: "=&r" (result)
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: "r" (&v->counter)
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);
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return result;
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}
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static inline void atomic64_set(atomic64_t *v, u64 i)
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{
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u64 tmp;
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__asm__ __volatile__("@ atomic64_set\n"
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"1: ldrexd %0, %H0, [%1]\n"
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" strexd %0, %2, %H2, [%1]\n"
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" teq %0, #0\n"
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" bne 1b"
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: "=&r" (tmp)
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: "r" (&v->counter), "r" (i)
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: "cc");
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}
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static inline void atomic64_add(u64 i, atomic64_t *v)
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{
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u64 result;
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unsigned long tmp;
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__asm__ __volatile__("@ atomic64_add\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" adds %0, %0, %3\n"
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" adc %H0, %H0, %H3\n"
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" strexd %1, %0, %H0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "r" (i)
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: "cc");
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}
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static inline u64 atomic64_add_return(u64 i, atomic64_t *v)
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{
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u64 result;
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unsigned long tmp;
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smp_mb();
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__asm__ __volatile__("@ atomic64_add_return\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" adds %0, %0, %3\n"
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" adc %H0, %H0, %H3\n"
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" strexd %1, %0, %H0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "r" (i)
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: "cc");
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smp_mb();
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return result;
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}
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static inline void atomic64_sub(u64 i, atomic64_t *v)
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{
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u64 result;
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unsigned long tmp;
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__asm__ __volatile__("@ atomic64_sub\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" subs %0, %0, %3\n"
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" sbc %H0, %H0, %H3\n"
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" strexd %1, %0, %H0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "r" (i)
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: "cc");
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}
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static inline u64 atomic64_sub_return(u64 i, atomic64_t *v)
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{
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u64 result;
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unsigned long tmp;
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smp_mb();
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__asm__ __volatile__("@ atomic64_sub_return\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" subs %0, %0, %3\n"
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" sbc %H0, %H0, %H3\n"
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" strexd %1, %0, %H0, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&v->counter), "r" (i)
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: "cc");
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smp_mb();
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return result;
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}
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static inline u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old, u64 new)
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{
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u64 oldval;
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unsigned long res;
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smp_mb();
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do {
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__asm__ __volatile__("@ atomic64_cmpxchg\n"
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"ldrexd %1, %H1, [%2]\n"
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"mov %0, #0\n"
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"teq %1, %3\n"
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"teqeq %H1, %H3\n"
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"strexdeq %0, %4, %H4, [%2]"
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: "=&r" (res), "=&r" (oldval)
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: "r" (&ptr->counter), "r" (old), "r" (new)
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: "cc");
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} while (res);
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smp_mb();
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return oldval;
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}
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static inline u64 atomic64_xchg(atomic64_t *ptr, u64 new)
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{
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u64 result;
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unsigned long tmp;
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smp_mb();
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__asm__ __volatile__("@ atomic64_xchg\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" strexd %1, %3, %H3, [%2]\n"
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" teq %1, #0\n"
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" bne 1b"
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: "=&r" (result), "=&r" (tmp)
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: "r" (&ptr->counter), "r" (new)
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: "cc");
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smp_mb();
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return result;
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}
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static inline u64 atomic64_dec_if_positive(atomic64_t *v)
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{
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u64 result;
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|
unsigned long tmp;
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smp_mb();
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__asm__ __volatile__("@ atomic64_dec_if_positive\n"
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"1: ldrexd %0, %H0, [%2]\n"
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" subs %0, %0, #1\n"
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" sbc %H0, %H0, #0\n"
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" teq %H0, #0\n"
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" bmi 2f\n"
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" strexd %1, %0, %H0, [%2]\n"
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" teq %1, #0\n"
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|
" bne 1b\n"
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|
"2:"
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|
: "=&r" (result), "=&r" (tmp)
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|
: "r" (&v->counter)
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|
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|
: "cc");
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|
|
smp_mb();
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|
|
return result;
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|
|
}
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|
static inline int atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
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|
|
{
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|
|
u64 val;
|
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|
|
unsigned long tmp;
|
|
|
|
int ret = 1;
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|
smp_mb();
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|
__asm__ __volatile__("@ atomic64_add_unless\n"
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|
|
"1: ldrexd %0, %H0, [%3]\n"
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|
|
|
" teq %0, %4\n"
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|
|
|
" teqeq %H0, %H4\n"
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|
|
|
" moveq %1, #0\n"
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|
|
" beq 2f\n"
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|
" adds %0, %0, %5\n"
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|
|
" adc %H0, %H0, %H5\n"
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|
|
|
" strexd %2, %0, %H0, [%3]\n"
|
|
|
|
" teq %2, #0\n"
|
|
|
|
" bne 1b\n"
|
|
|
|
"2:"
|
2010-07-08 03:58:06 -06:00
|
|
|
: "=&r" (val), "+r" (ret), "=&r" (tmp)
|
2010-01-20 11:05:07 -07:00
|
|
|
: "r" (&v->counter), "r" (u), "r" (a)
|
|
|
|
: "cc");
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
smp_mb();
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
|
|
|
|
#define atomic64_inc(v) atomic64_add(1LL, (v))
|
|
|
|
#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
|
|
|
|
#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
|
|
|
|
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
|
|
|
|
#define atomic64_dec(v) atomic64_sub(1LL, (v))
|
|
|
|
#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
|
|
|
|
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
|
|
|
|
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
|
|
|
|
|
|
|
|
#else /* !CONFIG_GENERIC_ATOMIC64 */
|
|
|
|
#include <asm-generic/atomic64.h>
|
|
|
|
#endif
|
2009-05-13 16:56:29 -06:00
|
|
|
#include <asm-generic/atomic-long.h>
|
2005-04-16 16:20:36 -06:00
|
|
|
#endif
|
|
|
|
#endif
|