include/asm-m68knommu/atomic.h

   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
 103 extern __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
 118 extern __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_dec_return(v) atomic_sub_return(1,(v))
 132 #define atomic_inc_return(v) atomic_add_return(1,(v))
 133
 134 #endif /* __ARCH_M68KNOMMU_ATOMIC __ */