LXR coreboot-v2/src/include/smp/atomic.h

   1#ifndef SMP_ATOMIC_H
   2#define SMP_ATOMIC_H
   3
   4#if CONFIG_SMP == 1
   5#include <arch/smp/atomic.h>
   6#else
   7
   8typedef struct { int counter; } atomic_t;
   9#define ATOMIC_INIT(i) { (i) }
  10
  11/**
  12 * atomic_read - read atomic variable
  13 * @v: pointer of type atomic_t
  14 * 
  15 * Atomically reads the value of @v.  Note that the guaranteed
  16 * useful range of an atomic_t is only 24 bits.
  17 */ 
  18#define atomic_read(v)          ((v)->counter)
  19
  20/**
  21 * atomic_set - set atomic variable
  22 * @v: pointer of type atomic_t
  23 * @i: required value
  24 * 
  25 * Atomically sets the value of @v to @i.  Note that the guaranteed
  26 * useful range of an atomic_t is only 24 bits.
  27 */ 
  28#define atomic_set(v,i)         (((v)->counter) = (i))
  29
  30
  31/**
  32 * atomic_inc - increment atomic variable
  33 * @v: pointer of type atomic_t
  34 * 
  35 * Atomically increments @v by 1.  Note that the guaranteed
  36 * useful range of an atomic_t is only 24 bits.
  37 */ 
  38#define atomic_inc(v)   (((v)->counter)++)
  39
  40
  41/**
  42 * atomic_dec - decrement atomic variable
  43 * @v: pointer of type atomic_t
  44 * 
  45 * Atomically decrements @v by 1.  Note that the guaranteed
  46 * useful range of an atomic_t is only 24 bits.
  47 */ 
  48#define atomic_dec(v)   (((v)->counter)--)
  49
  50
  51#endif /* CONFIG_SMP */
  52
  53#endif /* SMP_ATOMIC_H */
  54