[linux.git] / include / asm-sh / cmpxchg-irq.h

#ifndef __ASM_SH_CMPXCHG_IRQ_H
#define __ASM_SH_CMPXCHG_IRQ_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_SH_CMPXCHG_IRQ_H */
Commit	Line	Data
1efe4ce3 SM	1	#ifndef __ASM_SH_CMPXCHG_IRQ_H
	2	#define __ASM_SH_CMPXCHG_IRQ_H
	3
	4	static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
	5	{
	6	unsigned long flags, retval;
	7
	8	local_irq_save(flags);
	9	retval = *m;
	10	*m = val;
	11	local_irq_restore(flags);
	12	return retval;
	13	}
	14
	15	static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
	16	{
	17	unsigned long flags, retval;
	18
	19	local_irq_save(flags);
	20	retval = *m;
	21	*m = val & 0xff;
	22	local_irq_restore(flags);
	23	return retval;
	24	}
	25
	26	static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
	27	unsigned long new)
	28	{
	29	__u32 retval;
	30	unsigned long flags;
	31
	32	local_irq_save(flags);
	33	retval = *m;
	34	if (retval == old)
	35	*m = new;
	36	local_irq_restore(flags); /* implies memory barrier */
	37	return retval;
	38	}
	39
	40	#endif /* __ASM_SH_CMPXCHG_IRQ_H */