LXR linux/arch/h8300/include/asm/atomic.h

   1#ifndef __ARCH_H8300_ATOMIC__
   2#define __ARCH_H8300_ATOMIC__
   3
   4#include <linux/types.h>
   5
   6/*
   7 * Atomic operations that C can't guarantee us.  Useful for
   8 * resource counting etc..
   9 */
  10
  11#define ATOMIC_INIT(i)  { (i) }
  12
  13#define atomic_read(v)          ((v)->counter)
  14#define atomic_set(v, i)        (((v)->counter) = i)
  15
  16#include <asm/system.h>
  17#include <linux/kernel.h>
  18
  19static __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
  31static __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)
  41#define atomic_sub_and_test(i,v) (atomic_sub_return(i, v) == 0)
  42
  43static __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
  65static __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
  77static __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
  87static 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
 100#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 101
 102static 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
 116static __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
 127static __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
 144#include <asm-generic/atomic-long.h>
 145#endif /* __ARCH_H8300_ATOMIC __ */
 146