include/asm-h8300/atomic.h

   1 #ifndef __ARCH_H8300_ATOMIC__
   2 #define __ARCH_H8300_ATOMIC__
   3
   4 /*
   5  * Atomic operations that C can't guarantee us.  Useful for
   6  * resource counting etc..
   7  */
   8
   9 typedef struct { int counter; } atomic_t;
  10 #define ATOMIC_INIT(i)  { (i) }
  11
  12 #define atomic_read(v)          ((v)->counter)
  13 #define atomic_set(v, i)        (((v)->counter) = i)
  14
  15 #include <asm/system.h>
  16 #include <linux/kernel.h>
  17
  18 static __inline__ int atomic_add_return(int i, atomic_t *v)
  19 {
  20         int ret,flags;
  21         local_irq_save(flags);
  22         ret = v->counter += i;
  23         local_irq_restore(flags);
  24         return ret;
  25 }
  26
  27 #define atomic_add(i, v) atomic_add_return(i, v)
  28 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  29
  30 static __inline__ int atomic_sub_return(int i, atomic_t *v)
  31 {
  32         int ret,flags;
  33         local_irq_save(flags);
  34         ret = v->counter -= i;
  35         local_irq_restore(flags);
  36         return ret;
  37 }
  38
  39 #define atomic_sub(i, v) atomic_sub_return(i, v)
  40
  41 static __inline__ int atomic_inc_return(atomic_t *v)
  42 {
  43         int ret,flags;
  44         local_irq_save(flags);
  45         v->counter++;
  46         ret = v->counter;
  47         local_irq_restore(flags);
  48         return ret;
  49 }
  50
  51 #define atomic_inc(v) atomic_inc_return(v)
  52
  53 /*
  54  * atomic_inc_and_test - increment and test
  55  * @v: pointer of type atomic_t
  56  *
  57  * Atomically increments @v by 1
  58  * and returns true if the result is zero, or false for all
  59  * other cases.
  60  */
  61 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  62
  63 static __inline__ int atomic_dec_return(atomic_t *v)
  64 {
  65         int ret,flags;
  66         local_irq_save(flags);
  67         --v->counter;
  68         ret = v->counter;
  69         local_irq_restore(flags);
  70         return ret;
  71 }
  72
  73 #define atomic_dec(v) atomic_dec_return(v)
  74
  75 static __inline__ int atomic_dec_and_test(atomic_t *v)
  76 {
  77         int ret,flags;
  78         local_irq_save(flags);
  79         --v->counter;
  80         ret = v->counter;
  81         local_irq_restore(flags);
  82         return ret == 0;
  83 }
  84
  85 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
  86 {
  87         __asm__ __volatile__("stc ccr,r1l\n\t"
  88                              "orc #0x80,ccr\n\t"
  89                              "mov.l %0,er0\n\t"
  90                              "and.l %1,er0\n\t"
  91                              "mov.l er0,%0\n\t"
  92                              "ldc r1l,ccr"
  93                              : "=m" (*v) : "g" (~(mask)) :"er0","er1");
  94 }
  95
  96 static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
  97 {
  98         __asm__ __volatile__("stc ccr,r1l\n\t"
  99                              "orc #0x80,ccr\n\t"
 100                              "mov.l %0,er0\n\t"
 101                              "or.l %1,er0\n\t"
 102                              "mov.l er0,%0\n\t"
 103                              "ldc r1l,ccr"
 104                              : "=m" (*v) : "g" (mask) :"er0","er1");
 105 }
 106
 107 /* Atomic operations are already serializing */
 108 #define smp_mb__before_atomic_dec()    barrier()
 109 #define smp_mb__after_atomic_dec() barrier()
 110 #define smp_mb__before_atomic_inc()    barrier()
 111 #define smp_mb__after_atomic_inc() barrier()
 112
 113 #endif /* __ARCH_H8300_ATOMIC __ */