diff options
Diffstat (limited to 'kernel/arch/sh/include/asm/atomic-irq.h')
| -rw-r--r-- | kernel/arch/sh/include/asm/atomic-irq.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/kernel/arch/sh/include/asm/atomic-irq.h b/kernel/arch/sh/include/asm/atomic-irq.h new file mode 100644 index 000000000..61d107523 --- /dev/null +++ b/kernel/arch/sh/include/asm/atomic-irq.h @@ -0,0 +1,63 @@ +#ifndef __ASM_SH_ATOMIC_IRQ_H +#define __ASM_SH_ATOMIC_IRQ_H + +#include <linux/irqflags.h> + +/* + * To get proper branch prediction for the main line, we must branch + * forward to code at the end of this object's .text section, then + * branch back to restart the operation. + */ + +#define ATOMIC_OP(op, c_op) \ +static inline void atomic_##op(int i, atomic_t *v) \ +{ \ + unsigned long flags; \ + \ + raw_local_irq_save(flags); \ + v->counter c_op i; \ + raw_local_irq_restore(flags); \ +} + +#define ATOMIC_OP_RETURN(op, c_op) \ +static inline int atomic_##op##_return(int i, atomic_t *v) \ +{ \ + unsigned long temp, flags; \ + \ + raw_local_irq_save(flags); \ + temp = v->counter; \ + temp c_op i; \ + v->counter = temp; \ + raw_local_irq_restore(flags); \ + \ + return temp; \ +} + +#define ATOMIC_OPS(op, c_op) ATOMIC_OP(op, c_op) ATOMIC_OP_RETURN(op, c_op) + +ATOMIC_OPS(add, +=) +ATOMIC_OPS(sub, -=) + +#undef ATOMIC_OPS +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) +{ + unsigned long flags; + + raw_local_irq_save(flags); + v->counter &= ~mask; + raw_local_irq_restore(flags); +} + +static inline void atomic_set_mask(unsigned int mask, atomic_t *v) +{ + unsigned long flags; + + raw_local_irq_save(flags); + v->counter |= mask; + raw_local_irq_restore(flags); +} + +#endif /* __ASM_SH_ATOMIC_IRQ_H */ |