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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-v850/atomic.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
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!
Diffstat (limited to 'include/asm-v850/atomic.h')
-rw-r--r-- | include/asm-v850/atomic.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h new file mode 100644 index 000000000000..8284aa7363f2 --- /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 <miles@gnu.org> + * + * 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 <miles@gnu.org> + */ + +#ifndef __V850_ATOMIC_H__ +#define __V850_ATOMIC_H__ + +#include <linux/config.h> + +#include <asm/system.h> + +#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__ */ |