#ifndef _ASM_X86_I8259_H
#define _ASM_X86_I8259_H

#include <linux/delay.h>

extern unsigned int cached_irq_mask;

#define __byte(x, y) (((unsigned char *)&(y))[x])
#define cached_master_mask (__byte(0, cached_irq_mask))
#define cached_slave_mask (__byte(1, cached_irq_mask))

/* i8259A PIC registers */
#define PIC_MASTER_CMD 0x20
#define PIC_MASTER_IMR 0x21
#define PIC_MASTER_ISR PIC_MASTER_CMD
#define PIC_MASTER_POLL PIC_MASTER_ISR
#define PIC_MASTER_OCW3 PIC_MASTER_ISR
#define PIC_SLAVE_CMD 0xa0
#define PIC_SLAVE_IMR 0xa1

/* i8259A PIC related value */
#define PIC_CASCADE_IR 2
#define MASTER_ICW4_DEFAULT 0x01
#define SLAVE_ICW4_DEFAULT 0x01
#define PIC_ICW4_AEOI 2

extern raw_spinlock_t i8259A_lock;

/* the PIC may need a careful delay on some platforms, hence specific calls */
static inline unsigned char inb_pic(unsigned int port)
{
unsigned char value = inb(port);

/*
* delay for some accesses to PIC on motherboard or in chipset
* must be at least one microsecond, so be safe here:
*/
udelay(2);

return value;
}

static inline void outb_pic(unsigned char value, unsigned int port)
{
outb(value, port);
/*
* delay for some accesses to PIC on motherboard or in chipset
* must be at least one microsecond, so be safe here:
*/
udelay(2);
}

extern struct irq_chip i8259A_chip;

struct legacy_pic {
int nr_legacy_irqs;
struct irq_chip *chip;
void (*mask)(unsigned int irq);
void (*unmask)(unsigned int irq);
void (*mask_all)(void);
void (*restore_mask)(void);
void (*init)(int auto_eoi);
int (*irq_pending)(unsigned int irq);
void (*make_irq)(unsigned int irq);
};

extern struct legacy_pic *legacy_pic;
extern struct legacy_pic null_legacy_pic;

#endif /* _ASM_X86_I8259_H */