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7d89982b7a
mkconfig links ${objtree}/include/asm/proc/ to
${srctree}/arch/${arch}/include/asm/proc-armv/. This seems to be a
remnant from the past. Ever since its introduction in 2003 it is used
only in ARM build and always links to same place, so let's simplify
the code, remove it and reference directly where needed.
Successful MAKEALL for ARM and PowerPC verified on Linux.
Signed-off-by: Vasili Galka <vvv444@gmail.com>
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
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* linux/include/asm-arm/atomic.h
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*
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* Copyright (c) 1996 Russell King.
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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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* Changelog:
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* 27-06-1996 RMK Created
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* 13-04-1997 RMK Made functions atomic!
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* 07-12-1997 RMK Upgraded for v2.1.
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* 26-08-1998 PJB Added #ifdef __KERNEL__
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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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#ifdef CONFIG_SMP
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#error SMP not supported
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#endif
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typedef struct { volatile int counter; } atomic_t;
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#define ATOMIC_INIT(i) { (i) }
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#ifdef __KERNEL__
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#include <asm/proc-armv/system.h>
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v,i) (((v)->counter) = (i))
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static inline void atomic_add(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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v->counter += i;
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local_irq_restore(flags);
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}
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static inline void atomic_sub(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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v->counter -= i;
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local_irq_restore(flags);
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}
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static inline void atomic_inc(volatile atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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v->counter += 1;
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local_irq_restore(flags);
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}
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static inline void atomic_dec(volatile atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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v->counter -= 1;
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local_irq_restore(flags);
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}
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static inline int atomic_dec_and_test(volatile atomic_t *v)
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{
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unsigned long flags;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val -= 1;
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local_irq_restore(flags);
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return val == 0;
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}
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static inline int atomic_add_negative(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val += i;
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local_irq_restore(flags);
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return val < 0;
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}
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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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local_irq_save(flags);
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*addr &= ~mask;
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local_irq_restore(flags);
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}
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/* Atomic operations are already serializing on ARM */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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#endif
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#endif
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