[deliverable/linux.git] / arch / metag / include / asm / cmpxchg_irq.h

#ifndef __ASM_METAG_CMPXCHG_IRQ_H
#define __ASM_METAG_CMPXCHG_IRQ_H

#include <linux/irqflags.h>

static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
	unsigned long flags, retval;

	local_irq_save(flags);
	retval = *m;
	*m = val;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
	unsigned long flags, retval;

	local_irq_save(flags);
	retval = *m;
	*m = val & 0xff;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
					  unsigned long new)
{
	__u32 retval;
	unsigned long flags;

	local_irq_save(flags);
	retval = *m;
	if (retval == old)
		*m = new;
	local_irq_restore(flags);       /* implies memory barrier  */
	return retval;
}

#endif /* __ASM_METAG_CMPXCHG_IRQ_H */
Commit	Line	Data
6006c0d8 JH	1	#ifndef __ASM_METAG_CMPXCHG_IRQ_H
	2	#define __ASM_METAG_CMPXCHG_IRQ_H
	3
	4	#include <linux/irqflags.h>
	5
	6	static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
	7	{
	8	unsigned long flags, retval;
	9
	10	local_irq_save(flags);
	11	retval = *m;
	12	*m = val;
	13	local_irq_restore(flags);
	14	return retval;
	15	}
	16
	17	static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
	18	{
	19	unsigned long flags, retval;
	20
	21	local_irq_save(flags);
	22	retval = *m;
	23	*m = val & 0xff;
	24	local_irq_restore(flags);
	25	return retval;
	26	}
	27
	28	static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
	29	unsigned long new)
	30	{
	31	__u32 retval;
	32	unsigned long flags;
	33
	34	local_irq_save(flags);
	35	retval = *m;
	36	if (retval == old)
	37	*m = new;
	38	local_irq_restore(flags); /* implies memory barrier */
	39	return retval;
	40	}
	41
	42	#endif /* __ASM_METAG_CMPXCHG_IRQ_H */