Release 4.16 arch/x86/include/asm/i8259.h

/* SPDX-License-Identifier: GPL-2.0 */
#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;
}

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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);
}

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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 (*probe)(void);
	
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;



static inline bool has_legacy_pic(void)
{
	return legacy_pic != &null_legacy_pic;
}

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static inline int nr_legacy_irqs(void)
{
	return legacy_pic->nr_legacy_irqs;
}

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#endif /* _ASM_X86_I8259_H */
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Vitaly Kuznetsov
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Directory: arch/x86/include/asm

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