Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __ARCH_M68KNOMMU_ATOMIC__ |
| 2 | #define __ARCH_M68KNOMMU_ATOMIC__ |
| 3 | |
| 4 | #include <asm/system.h> /* local_irq_XXX() */ |
| 5 | |
| 6 | /* |
| 7 | * Atomic operations that C can't guarantee us. Useful for |
| 8 | * resource counting etc.. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * We do not have SMP m68k systems, so we don't have to deal with that. |
| 13 | */ |
| 14 | |
| 15 | typedef struct { int counter; } atomic_t; |
| 16 | #define ATOMIC_INIT(i) { (i) } |
| 17 | |
| 18 | #define atomic_read(v) ((v)->counter) |
| 19 | #define atomic_set(v, i) (((v)->counter) = i) |
| 20 | |
| 21 | static __inline__ void atomic_add(int i, atomic_t *v) |
| 22 | { |
| 23 | #ifdef CONFIG_COLDFIRE |
| 24 | __asm__ __volatile__("addl %1,%0" : "+m" (*v) : "d" (i)); |
| 25 | #else |
| 26 | __asm__ __volatile__("addl %1,%0" : "+m" (*v) : "di" (i)); |
| 27 | #endif |
| 28 | } |
| 29 | |
| 30 | static __inline__ void atomic_sub(int i, atomic_t *v) |
| 31 | { |
| 32 | #ifdef CONFIG_COLDFIRE |
| 33 | __asm__ __volatile__("subl %1,%0" : "+m" (*v) : "d" (i)); |
| 34 | #else |
| 35 | __asm__ __volatile__("subl %1,%0" : "+m" (*v) : "di" (i)); |
| 36 | #endif |
| 37 | } |
| 38 | |
| 39 | static __inline__ int atomic_sub_and_test(int i, atomic_t * v) |
| 40 | { |
| 41 | char c; |
| 42 | #ifdef CONFIG_COLDFIRE |
| 43 | __asm__ __volatile__("subl %2,%1; seq %0" |
| 44 | : "=d" (c), "+m" (*v) |
| 45 | : "d" (i)); |
| 46 | #else |
| 47 | __asm__ __volatile__("subl %2,%1; seq %0" |
| 48 | : "=d" (c), "+m" (*v) |
| 49 | : "di" (i)); |
| 50 | #endif |
| 51 | return c != 0; |
| 52 | } |
| 53 | |
| 54 | static __inline__ void atomic_inc(volatile atomic_t *v) |
| 55 | { |
| 56 | __asm__ __volatile__("addql #1,%0" : "+m" (*v)); |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * atomic_inc_and_test - increment and test |
| 61 | * @v: pointer of type atomic_t |
| 62 | * |
| 63 | * Atomically increments @v by 1 |
| 64 | * and returns true if the result is zero, or false for all |
| 65 | * other cases. |
| 66 | */ |
| 67 | |
| 68 | static __inline__ int atomic_inc_and_test(volatile atomic_t *v) |
| 69 | { |
| 70 | char c; |
| 71 | __asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v)); |
| 72 | return c != 0; |
| 73 | } |
| 74 | |
| 75 | static __inline__ void atomic_dec(volatile atomic_t *v) |
| 76 | { |
| 77 | __asm__ __volatile__("subql #1,%0" : "+m" (*v)); |
| 78 | } |
| 79 | |
| 80 | static __inline__ int atomic_dec_and_test(volatile atomic_t *v) |
| 81 | { |
| 82 | char c; |
| 83 | __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v)); |
| 84 | return c != 0; |
| 85 | } |
| 86 | |
| 87 | static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) |
| 88 | { |
| 89 | __asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask))); |
| 90 | } |
| 91 | |
| 92 | static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v) |
| 93 | { |
| 94 | __asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask)); |
| 95 | } |
| 96 | |
| 97 | /* Atomic operations are already serializing */ |
| 98 | #define smp_mb__before_atomic_dec() barrier() |
| 99 | #define smp_mb__after_atomic_dec() barrier() |
| 100 | #define smp_mb__before_atomic_inc() barrier() |
| 101 | #define smp_mb__after_atomic_inc() barrier() |
| 102 | |
Greg Ungerer | c514b8b | 2005-11-02 14:42:03 +1000 | [diff] [blame] | 103 | static inline int atomic_add_return(int i, atomic_t * v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
| 105 | unsigned long temp, flags; |
| 106 | |
| 107 | local_irq_save(flags); |
| 108 | temp = *(long *)v; |
| 109 | temp += i; |
| 110 | *(long *)v = temp; |
| 111 | local_irq_restore(flags); |
| 112 | |
| 113 | return temp; |
| 114 | } |
| 115 | |
| 116 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
| 117 | |
Greg Ungerer | c514b8b | 2005-11-02 14:42:03 +1000 | [diff] [blame] | 118 | static inline int atomic_sub_return(int i, atomic_t * v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
| 120 | unsigned long temp, flags; |
| 121 | |
| 122 | local_irq_save(flags); |
| 123 | temp = *(long *)v; |
| 124 | temp -= i; |
| 125 | *(long *)v = temp; |
| 126 | local_irq_restore(flags); |
| 127 | |
| 128 | return temp; |
| 129 | } |
| 130 | |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 131 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
| 132 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 133 | #define atomic_add_unless(v, a, u) \ |
| 134 | ({ \ |
| 135 | int c, old; \ |
| 136 | c = atomic_read(v); \ |
| 137 | while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ |
| 138 | c = old; \ |
| 139 | c != (u); \ |
| 140 | }) |
| 141 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
| 144 | #define atomic_inc_return(v) atomic_add_return(1,(v)) |
| 145 | |
| 146 | #endif /* __ARCH_M68KNOMMU_ATOMIC __ */ |