LXR linux/arch/m68k/include/asm/atomic

   1#ifndef __ARCH_M68KNOMMU_ATOMIC__
   2#define __ARCH_M68KNOMMU_ATOMIC__
   3
   4#include <linux/types.h>
   5#include <asm/system.h>
   6
   7/*
   8 * Atomic operations that C can't guarantee us.  Useful for
   9 * resource counting etc..
  10 */
  11
  12/*
  13 * We do not have SMP m68k systems, so we don't have to deal with that.
  14 */
  15
  16#define ATOMIC_INIT(i)  { (i) }
  17
  18#define atomic_read(v)          ((v)->counter)
  19#define atomic_set(v, i)        (((v)->counter) = i)
  20
  21static __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
  30static __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
  39static __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
  54static __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
  68static __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
  75static __inline__ void atomic_dec(volatile atomic_t *v)
  76{
  77        __asm__ __volatile__("subql #1,%0" : "+m" (*v));
  78}
  79
  80static __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
  87static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
  88{
  89        __asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask)));
  90}
  91
  92static __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
 103static inline int atomic_add_return(int i, atomic_t * v)
 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
 118static inline int atomic_sub_return(int i, atomic_t * v)
 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
 131#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
 132#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 133
 134static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
 135{
 136        int c, old;
 137        c = atomic_read(v);
 138        for (;;) {
 139                if (unlikely(c == (u)))
 140                        break;
 141                old = atomic_cmpxchg((v), c, c + (a));
 142                if (likely(old == c))
 143                        break;
 144                c = old;
 145        }
 146        return c != (u);
 147}
 148
 149#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
 150
 151#define atomic_dec_return(v) atomic_sub_return(1,(v))
 152#define atomic_inc_return(v) atomic_add_return(1,(v))
 153
 154#include <asm-generic/atomic-long.h>
 155#endif /* __ARCH_M68KNOMMU_ATOMIC __ */
 156