projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * include/asm-v850/atomic.h -- Atomic operations | |
| 3 | * | |
| 4 | * Copyright (C) 2001,02 NEC Corporation | |
| 5 | * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> | |
| 6 | * | |
| 7 | * This file is subject to the terms and conditions of the GNU General | |
| 8 | * Public License. See the file COPYING in the main directory of this | |
| 9 | * archive for more details. | |
| 10 | * | |
| 11 | * Written by Miles Bader <miles@gnu.org> | |
| 12 | */ | |
| 13 | ||
| 14 | #ifndef __V850_ATOMIC_H__ | |
| 15 | #define __V850_ATOMIC_H__ | |
| 16 | ||
| 17 | #include <linux/config.h> | |
| 18 | ||
| 19 | #include <asm/system.h> | |
| 20 | ||
| 21 | #ifdef CONFIG_SMP | |
| 22 | #error SMP not supported | |
| 23 | #endif | |
| 24 | ||
| 25 | typedef struct { int counter; } atomic_t; | |
| 26 | ||
| 27 | #define ATOMIC_INIT(i) { (i) } | |
| 28 | ||
| 29 | #ifdef __KERNEL__ | |
| 30 | ||
| 31 | #define atomic_read(v) ((v)->counter) | |
| 32 | #define atomic_set(v,i) (((v)->counter) = (i)) | |
| 33 | ||
| 34 | extern __inline__ int atomic_add_return (int i, volatile atomic_t *v) | |
| 35 | { | |
| 36 | unsigned long flags; | |
| 37 | int res; | |
| 38 | ||
| 39 | local_irq_save (flags); | |
| 40 | res = v->counter + i; | |
| 41 | v->counter = res; | |
| 42 | local_irq_restore (flags); | |
| 43 | ||
| 44 | return res; | |
| 45 | } | |
| 46 | ||
| 47 | static __inline__ int atomic_sub_return (int i, volatile atomic_t *v) | |
| 48 | { | |
| 49 | unsigned long flags; | |
| 50 | int res; | |
| 51 | ||
| 52 | local_irq_save (flags); | |
| 53 | res = v->counter - i; | |
| 54 | v->counter = res; | |
| 55 | local_irq_restore (flags); | |
| 56 | ||
| 57 | return res; | |
| 58 | } | |
| 59 | ||
| 60 | static __inline__ void atomic_clear_mask (unsigned long mask, unsigned long *addr) | |
| 61 | { | |
| 62 | unsigned long flags; | |
| 63 | ||
| 64 | local_irq_save (flags); | |
| 65 | *addr &= ~mask; | |
| 66 | local_irq_restore (flags); | |
| 67 | } | |
| 68 | ||
| 69 | #endif | |
| 70 | ||
| 71 | #define atomic_add(i, v) atomic_add_return ((i), (v)) | |
| 72 | #define atomic_sub(i, v) atomic_sub_return ((i), (v)) | |
| 73 | ||
| 74 | #define atomic_dec_return(v) atomic_sub_return (1, (v)) | |
| 75 | #define atomic_inc_return(v) atomic_add_return (1, (v)) | |
| 76 | #define atomic_inc(v) atomic_inc_return (v) | |
| 77 | #define atomic_dec(v) atomic_dec_return (v) | |
| 78 | ||
| 79 | /* | |
| 80 | * atomic_inc_and_test - increment and test | |
| 81 | * @v: pointer of type atomic_t | |
| 82 | * | |
| 83 | * Atomically increments @v by 1 | |
| 84 | * and returns true if the result is zero, or false for all | |
| 85 | * other cases. | |
| 86 | */ | |
| 87 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
| 88 | ||
| 89 | #define atomic_sub_and_test(i,v) (atomic_sub_return ((i), (v)) == 0) | |
| 90 | #define atomic_dec_and_test(v) (atomic_sub_return (1, (v)) == 0) | |
| 91 | #define atomic_add_negative(i,v) (atomic_add_return ((i), (v)) < 0) | |
| 92 | ||
| 93 | /* Atomic operations are already serializing on ARM */ | |
| 94 | #define smp_mb__before_atomic_dec() barrier() | |
| 95 | #define smp_mb__after_atomic_dec() barrier() | |
| 96 | #define smp_mb__before_atomic_inc() barrier() | |
| 97 | #define smp_mb__after_atomic_inc() barrier() | |
| 98 | ||
| 99 | #endif /* __V850_ATOMIC_H__ */ |