arch/sh/include/asm/atomic-irq.h

   1 #ifndef __ASM_SH_ATOMIC_IRQ_H
   2 #define __ASM_SH_ATOMIC_IRQ_H
   3
   4 #include <linux/irqflags.h>
   5
   6 /*
   7  * To get proper branch prediction for the main line, we must branch
   8  * forward to code at the end of this object's .text section, then
   9  * branch back to restart the operation.
  10  */
  11
  12 #define ATOMIC_OP(op, c_op)                                             \
  13 static inline void atomic_##op(int i, atomic_t *v)                      \
  14 {                                                                       \
  15         unsigned long flags;                                            \
  16                                                                         \
  17         raw_local_irq_save(flags);                                      \
  18         v->counter c_op i;                                              \
  19         raw_local_irq_restore(flags);                                   \
  20 }
  21
  22 #define ATOMIC_OP_RETURN(op, c_op)                                      \
  23 static inline int atomic_##op##_return(int i, atomic_t *v)              \
  24 {                                                                       \
  25         unsigned long temp, flags;                                      \
  26                                                                         \
  27         raw_local_irq_save(flags);                                      \
  28         temp = v->counter;                                              \
  29         temp c_op i;                                                    \
  30         v->counter = temp;                                              \
  31         raw_local_irq_restore(flags);                                   \
  32                                                                         \
  33         return temp;                                                    \
  34 }
  35
  36 #define ATOMIC_FETCH_OP(op, c_op)                                       \
  37 static inline int atomic_fetch_##op(int i, atomic_t *v)                 \
  38 {                                                                       \
  39         unsigned long temp, flags;                                      \
  40                                                                         \
  41         raw_local_irq_save(flags);                                      \
  42         temp = v->counter;                                              \
  43         v->counter c_op i;                                              \
  44         raw_local_irq_restore(flags);                                   \
  45                                                                         \
  46         return temp;                                                    \
  47 }
  48
  49 #define ATOMIC_OPS(op, c_op)                                            \
  50         ATOMIC_OP(op, c_op)                                             \
  51         ATOMIC_OP_RETURN(op, c_op)                                      \
  52         ATOMIC_FETCH_OP(op, c_op)
  53
  54 ATOMIC_OPS(add, +=)
  55 ATOMIC_OPS(sub, -=)
  56
  57 #undef ATOMIC_OPS
  58 #define ATOMIC_OPS(op, c_op)                                            \
  59         ATOMIC_OP(op, c_op)                                             \
  60         ATOMIC_FETCH_OP(op, c_op)
  61
  62 ATOMIC_OPS(and, &=)
  63 ATOMIC_OPS(or, |=)
  64 ATOMIC_OPS(xor, ^=)
  65
  66 #undef ATOMIC_OPS
  67 #undef ATOMIC_FETCH_OP
  68 #undef ATOMIC_OP_RETURN
  69 #undef ATOMIC_OP
  70
  71 #endif /* __ASM_SH_ATOMIC_IRQ_H */