1. 根目录:
2. arch
3. alpha
4. include
5. asm
6. irqflags.h

#ifndef __ALPHA_IRQFLAGS_H
#define __ALPHA_IRQFLAGS_H

#include <asm/pal.h>

#define IPL_MIN		0
#define IPL_SW0		1
#define IPL_SW1		2
#define IPL_DEV0	3
#define IPL_DEV1	4
#define IPL_TIMER	5
#define IPL_PERF	6
#define IPL_POWERFAIL	6
#define IPL_MCHECK	7
#define IPL_MAX		7

#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
#undef IPL_MIN
#define IPL_MIN		__min_ipl
extern int __min_ipl;
#endif

#define getipl()		(rdps() & 7)
#define setipl(ipl)		((void) swpipl(ipl))

static inline unsigned long arch_local_save_flags(void)
{
	return rdps();
}

static inline void arch_local_irq_disable(void)
{
	setipl(IPL_MAX);
	barrier();
}

static inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags = swpipl(IPL_MAX);
	barrier();
	return flags;
}

static inline void arch_local_irq_enable(void)
{
	barrier();
	setipl(IPL_MIN);
}

static inline void arch_local_irq_restore(unsigned long flags)
{
	barrier();
	setipl(flags);
	barrier();
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
	return flags == IPL_MAX;
}

static inline bool arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(getipl());
}

#endif /* __ALPHA_IRQFLAGS_H */