Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __ARCH_H8300_ATOMIC__ |
| 2 | #define __ARCH_H8300_ATOMIC__ |
| 3 | |
Matthew Wilcox | ea435467 | 2009-01-06 14:40:39 -0800 | [diff] [blame] | 4 | #include <linux/types.h> |
| 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | /* |
| 7 | * Atomic operations that C can't guarantee us. Useful for |
| 8 | * resource counting etc.. |
| 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #define ATOMIC_INIT(i) { (i) } |
| 12 | |
Anton Blanchard | f3d46f9 | 2010-05-17 14:33:53 +1000 | [diff] [blame] | 13 | #define atomic_read(v) (*(volatile int *)&(v)->counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #define atomic_set(v, i) (((v)->counter) = i) |
| 15 | |
| 16 | #include <asm/system.h> |
| 17 | #include <linux/kernel.h> |
| 18 | |
| 19 | static __inline__ int atomic_add_return(int i, atomic_t *v) |
| 20 | { |
| 21 | int ret,flags; |
| 22 | local_irq_save(flags); |
| 23 | ret = v->counter += i; |
| 24 | local_irq_restore(flags); |
| 25 | return ret; |
| 26 | } |
| 27 | |
| 28 | #define atomic_add(i, v) atomic_add_return(i, v) |
| 29 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
| 30 | |
| 31 | static __inline__ int atomic_sub_return(int i, atomic_t *v) |
| 32 | { |
| 33 | int ret,flags; |
| 34 | local_irq_save(flags); |
| 35 | ret = v->counter -= i; |
| 36 | local_irq_restore(flags); |
| 37 | return ret; |
| 38 | } |
| 39 | |
| 40 | #define atomic_sub(i, v) atomic_sub_return(i, v) |
Yoshinori Sato | b67405b | 2007-05-15 01:41:07 -0700 | [diff] [blame] | 41 | #define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | static __inline__ int atomic_inc_return(atomic_t *v) |
| 44 | { |
| 45 | int ret,flags; |
| 46 | local_irq_save(flags); |
| 47 | v->counter++; |
| 48 | ret = v->counter; |
| 49 | local_irq_restore(flags); |
| 50 | return ret; |
| 51 | } |
| 52 | |
| 53 | #define atomic_inc(v) atomic_inc_return(v) |
| 54 | |
| 55 | /* |
| 56 | * atomic_inc_and_test - increment and test |
| 57 | * @v: pointer of type atomic_t |
| 58 | * |
| 59 | * Atomically increments @v by 1 |
| 60 | * and returns true if the result is zero, or false for all |
| 61 | * other cases. |
| 62 | */ |
| 63 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 64 | |
| 65 | static __inline__ int atomic_dec_return(atomic_t *v) |
| 66 | { |
| 67 | int ret,flags; |
| 68 | local_irq_save(flags); |
| 69 | --v->counter; |
| 70 | ret = v->counter; |
| 71 | local_irq_restore(flags); |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | #define atomic_dec(v) atomic_dec_return(v) |
| 76 | |
| 77 | static __inline__ int atomic_dec_and_test(atomic_t *v) |
| 78 | { |
| 79 | int ret,flags; |
| 80 | local_irq_save(flags); |
| 81 | --v->counter; |
| 82 | ret = v->counter; |
| 83 | local_irq_restore(flags); |
| 84 | return ret == 0; |
| 85 | } |
| 86 | |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 87 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
| 88 | { |
| 89 | int ret; |
| 90 | unsigned long flags; |
| 91 | |
| 92 | local_irq_save(flags); |
| 93 | ret = v->counter; |
| 94 | if (likely(ret == old)) |
| 95 | v->counter = new; |
| 96 | local_irq_restore(flags); |
| 97 | return ret; |
| 98 | } |
| 99 | |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 100 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| 101 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 102 | static inline int atomic_add_unless(atomic_t *v, int a, int u) |
| 103 | { |
| 104 | int ret; |
| 105 | unsigned long flags; |
| 106 | |
| 107 | local_irq_save(flags); |
| 108 | ret = v->counter; |
| 109 | if (ret != u) |
| 110 | v->counter += a; |
| 111 | local_irq_restore(flags); |
| 112 | return ret != u; |
| 113 | } |
| 114 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) |
| 117 | { |
| 118 | __asm__ __volatile__("stc ccr,r1l\n\t" |
| 119 | "orc #0x80,ccr\n\t" |
| 120 | "mov.l %0,er0\n\t" |
| 121 | "and.l %1,er0\n\t" |
| 122 | "mov.l er0,%0\n\t" |
| 123 | "ldc r1l,ccr" |
| 124 | : "=m" (*v) : "g" (~(mask)) :"er0","er1"); |
| 125 | } |
| 126 | |
| 127 | static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v) |
| 128 | { |
| 129 | __asm__ __volatile__("stc ccr,r1l\n\t" |
| 130 | "orc #0x80,ccr\n\t" |
| 131 | "mov.l %0,er0\n\t" |
| 132 | "or.l %1,er0\n\t" |
| 133 | "mov.l er0,%0\n\t" |
| 134 | "ldc r1l,ccr" |
| 135 | : "=m" (*v) : "g" (mask) :"er0","er1"); |
| 136 | } |
| 137 | |
| 138 | /* Atomic operations are already serializing */ |
| 139 | #define smp_mb__before_atomic_dec() barrier() |
| 140 | #define smp_mb__after_atomic_dec() barrier() |
| 141 | #define smp_mb__before_atomic_inc() barrier() |
| 142 | #define smp_mb__after_atomic_inc() barrier() |
| 143 | |
Arnd Bergmann | 72099ed | 2009-05-13 22:56:29 +0000 | [diff] [blame] | 144 | #include <asm-generic/atomic-long.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | #endif /* __ARCH_H8300_ATOMIC __ */ |