From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-v850/atomic.h | 99 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 include/asm-v850/atomic.h (limited to 'include/asm-v850/atomic.h') diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h new file mode 100644 index 00000000000..8284aa7363f --- /dev/null +++ b/include/asm-v850/atomic.h @@ -0,0 +1,99 @@ +/* + * include/asm-v850/atomic.h -- Atomic operations + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader + */ + +#ifndef __V850_ATOMIC_H__ +#define __V850_ATOMIC_H__ + +#include + +#include + +#ifdef CONFIG_SMP +#error SMP not supported +#endif + +typedef struct { int counter; } atomic_t; + +#define ATOMIC_INIT(i) { (i) } + +#ifdef __KERNEL__ + +#define atomic_read(v) ((v)->counter) +#define atomic_set(v,i) (((v)->counter) = (i)) + +extern __inline__ int atomic_add_return (int i, volatile atomic_t *v) +{ + unsigned long flags; + int res; + + local_irq_save (flags); + res = v->counter + i; + v->counter = res; + local_irq_restore (flags); + + return res; +} + +static __inline__ int atomic_sub_return (int i, volatile atomic_t *v) +{ + unsigned long flags; + int res; + + local_irq_save (flags); + res = v->counter - i; + v->counter = res; + local_irq_restore (flags); + + return res; +} + +static __inline__ void atomic_clear_mask (unsigned long mask, unsigned long *addr) +{ + unsigned long flags; + + local_irq_save (flags); + *addr &= ~mask; + local_irq_restore (flags); +} + +#endif + +#define atomic_add(i, v) atomic_add_return ((i), (v)) +#define atomic_sub(i, v) atomic_sub_return ((i), (v)) + +#define atomic_dec_return(v) atomic_sub_return (1, (v)) +#define atomic_inc_return(v) atomic_add_return (1, (v)) +#define atomic_inc(v) atomic_inc_return (v) +#define atomic_dec(v) atomic_dec_return (v) + +/* + * atomic_inc_and_test - increment and test + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) + +#define atomic_sub_and_test(i,v) (atomic_sub_return ((i), (v)) == 0) +#define atomic_dec_and_test(v) (atomic_sub_return (1, (v)) == 0) +#define atomic_add_negative(i,v) (atomic_add_return ((i), (v)) < 0) + +/* Atomic operations are already serializing on ARM */ +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() + +#endif /* __V850_ATOMIC_H__ */ -- cgit v1.2.3